kvm_main.c 67.9 KB
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/*
 * Kernel-based Virtual Machine driver for Linux
 *
 * This module enables machines with Intel VT-x extensions to run virtual
 * machines without emulation or binary translation.
 *
 * Copyright (C) 2006 Qumranet, Inc.
 *
 * Authors:
 *   Avi Kivity   <avi@qumranet.com>
 *   Yaniv Kamay  <yaniv@qumranet.com>
 *
 * This work is licensed under the terms of the GNU GPL, version 2.  See
 * the COPYING file in the top-level directory.
 *
 */

#include "kvm.h"

#include <linux/kvm.h>
#include <linux/module.h>
#include <linux/errno.h>
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#include <linux/magic.h>
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#include <asm/processor.h>
#include <linux/percpu.h>
#include <linux/gfp.h>
#include <asm/msr.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/vmalloc.h>
#include <asm/uaccess.h>
#include <linux/reboot.h>
#include <asm/io.h>
#include <linux/debugfs.h>
#include <linux/highmem.h>
#include <linux/file.h>
#include <asm/desc.h>
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#include <linux/sysdev.h>
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#include <linux/cpu.h>
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#include <linux/file.h>
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#include <linux/fs.h>
#include <linux/mount.h>
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#include "x86_emulate.h"
#include "segment_descriptor.h"

MODULE_AUTHOR("Qumranet");
MODULE_LICENSE("GPL");

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static DEFINE_SPINLOCK(kvm_lock);
static LIST_HEAD(vm_list);

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struct kvm_arch_ops *kvm_arch_ops;
struct kvm_stat kvm_stat;
EXPORT_SYMBOL_GPL(kvm_stat);

static struct kvm_stats_debugfs_item {
	const char *name;
	u32 *data;
	struct dentry *dentry;
} debugfs_entries[] = {
	{ "pf_fixed", &kvm_stat.pf_fixed },
	{ "pf_guest", &kvm_stat.pf_guest },
	{ "tlb_flush", &kvm_stat.tlb_flush },
	{ "invlpg", &kvm_stat.invlpg },
	{ "exits", &kvm_stat.exits },
	{ "io_exits", &kvm_stat.io_exits },
	{ "mmio_exits", &kvm_stat.mmio_exits },
	{ "signal_exits", &kvm_stat.signal_exits },
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	{ "irq_window", &kvm_stat.irq_window_exits },
	{ "halt_exits", &kvm_stat.halt_exits },
	{ "request_irq", &kvm_stat.request_irq_exits },
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	{ "irq_exits", &kvm_stat.irq_exits },
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	{ NULL, NULL }
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};

static struct dentry *debugfs_dir;

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struct vfsmount *kvmfs_mnt;

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#define MAX_IO_MSRS 256

#define CR0_RESEVED_BITS 0xffffffff1ffaffc0ULL
#define LMSW_GUEST_MASK 0x0eULL
#define CR4_RESEVED_BITS (~((1ULL << 11) - 1))
#define CR8_RESEVED_BITS (~0x0fULL)
#define EFER_RESERVED_BITS 0xfffffffffffff2fe

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#ifdef CONFIG_X86_64
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// LDT or TSS descriptor in the GDT. 16 bytes.
struct segment_descriptor_64 {
	struct segment_descriptor s;
	u32 base_higher;
	u32 pad_zero;
};

#endif

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static long kvm_vcpu_ioctl(struct file *file, unsigned int ioctl,
			   unsigned long arg);

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static struct inode *kvmfs_inode(struct file_operations *fops)
{
	int error = -ENOMEM;
	struct inode *inode = new_inode(kvmfs_mnt->mnt_sb);

	if (!inode)
		goto eexit_1;

	inode->i_fop = fops;

	/*
	 * Mark the inode dirty from the very beginning,
	 * that way it will never be moved to the dirty
	 * list because mark_inode_dirty() will think
	 * that it already _is_ on the dirty list.
	 */
	inode->i_state = I_DIRTY;
	inode->i_mode = S_IRUSR | S_IWUSR;
	inode->i_uid = current->fsuid;
	inode->i_gid = current->fsgid;
	inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
	return inode;

eexit_1:
	return ERR_PTR(error);
}

static struct file *kvmfs_file(struct inode *inode, void *private_data)
{
	struct file *file = get_empty_filp();

	if (!file)
		return ERR_PTR(-ENFILE);

	file->f_path.mnt = mntget(kvmfs_mnt);
	file->f_path.dentry = d_alloc_anon(inode);
	if (!file->f_path.dentry)
		return ERR_PTR(-ENOMEM);
	file->f_mapping = inode->i_mapping;

	file->f_pos = 0;
	file->f_flags = O_RDWR;
	file->f_op = inode->i_fop;
	file->f_mode = FMODE_READ | FMODE_WRITE;
	file->f_version = 0;
	file->private_data = private_data;
	return file;
}

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unsigned long segment_base(u16 selector)
{
	struct descriptor_table gdt;
	struct segment_descriptor *d;
	unsigned long table_base;
	typedef unsigned long ul;
	unsigned long v;

	if (selector == 0)
		return 0;

	asm ("sgdt %0" : "=m"(gdt));
	table_base = gdt.base;

	if (selector & 4) {           /* from ldt */
		u16 ldt_selector;

		asm ("sldt %0" : "=g"(ldt_selector));
		table_base = segment_base(ldt_selector);
	}
	d = (struct segment_descriptor *)(table_base + (selector & ~7));
	v = d->base_low | ((ul)d->base_mid << 16) | ((ul)d->base_high << 24);
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#ifdef CONFIG_X86_64
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	if (d->system == 0
	    && (d->type == 2 || d->type == 9 || d->type == 11))
		v |= ((ul)((struct segment_descriptor_64 *)d)->base_higher) << 32;
#endif
	return v;
}
EXPORT_SYMBOL_GPL(segment_base);

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static inline int valid_vcpu(int n)
{
	return likely(n >= 0 && n < KVM_MAX_VCPUS);
}

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int kvm_read_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
		   void *dest)
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{
	unsigned char *host_buf = dest;
	unsigned long req_size = size;

	while (size) {
		hpa_t paddr;
		unsigned now;
		unsigned offset;
		hva_t guest_buf;

		paddr = gva_to_hpa(vcpu, addr);

		if (is_error_hpa(paddr))
			break;

		guest_buf = (hva_t)kmap_atomic(
					pfn_to_page(paddr >> PAGE_SHIFT),
					KM_USER0);
		offset = addr & ~PAGE_MASK;
		guest_buf |= offset;
		now = min(size, PAGE_SIZE - offset);
		memcpy(host_buf, (void*)guest_buf, now);
		host_buf += now;
		addr += now;
		size -= now;
		kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
	}
	return req_size - size;
}
EXPORT_SYMBOL_GPL(kvm_read_guest);

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int kvm_write_guest(struct kvm_vcpu *vcpu, gva_t addr, unsigned long size,
		    void *data)
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{
	unsigned char *host_buf = data;
	unsigned long req_size = size;

	while (size) {
		hpa_t paddr;
		unsigned now;
		unsigned offset;
		hva_t guest_buf;
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		gfn_t gfn;
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		paddr = gva_to_hpa(vcpu, addr);

		if (is_error_hpa(paddr))
			break;

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		gfn = vcpu->mmu.gva_to_gpa(vcpu, addr) >> PAGE_SHIFT;
		mark_page_dirty(vcpu->kvm, gfn);
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		guest_buf = (hva_t)kmap_atomic(
				pfn_to_page(paddr >> PAGE_SHIFT), KM_USER0);
		offset = addr & ~PAGE_MASK;
		guest_buf |= offset;
		now = min(size, PAGE_SIZE - offset);
		memcpy((void*)guest_buf, host_buf, now);
		host_buf += now;
		addr += now;
		size -= now;
		kunmap_atomic((void *)(guest_buf & PAGE_MASK), KM_USER0);
	}
	return req_size - size;
}
EXPORT_SYMBOL_GPL(kvm_write_guest);

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/*
 * Switches to specified vcpu, until a matching vcpu_put()
 */
static void vcpu_load(struct kvm_vcpu *vcpu)
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{
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	mutex_lock(&vcpu->mutex);
	kvm_arch_ops->vcpu_load(vcpu);
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}

/*
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 * Switches to specified vcpu, until a matching vcpu_put(). Will return NULL
 * if the slot is not populated.
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 */
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static struct kvm_vcpu *vcpu_load_slot(struct kvm *kvm, int slot)
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{
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	struct kvm_vcpu *vcpu = &kvm->vcpus[slot];
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	mutex_lock(&vcpu->mutex);
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	if (!vcpu->vmcs) {
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		mutex_unlock(&vcpu->mutex);
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		return NULL;
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	}
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	kvm_arch_ops->vcpu_load(vcpu);
	return vcpu;
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}

static void vcpu_put(struct kvm_vcpu *vcpu)
{
	kvm_arch_ops->vcpu_put(vcpu);
	mutex_unlock(&vcpu->mutex);
}

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static struct kvm *kvm_create_vm(void)
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{
	struct kvm *kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
	int i;

	if (!kvm)
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		return ERR_PTR(-ENOMEM);
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	spin_lock_init(&kvm->lock);
	INIT_LIST_HEAD(&kvm->active_mmu_pages);
	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
		struct kvm_vcpu *vcpu = &kvm->vcpus[i];

		mutex_init(&vcpu->mutex);
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		vcpu->cpu = -1;
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		vcpu->kvm = kvm;
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		vcpu->mmu.root_hpa = INVALID_PAGE;
		INIT_LIST_HEAD(&vcpu->free_pages);
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		spin_lock(&kvm_lock);
		list_add(&kvm->vm_list, &vm_list);
		spin_unlock(&kvm_lock);
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	}
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	return kvm;
}

static int kvm_dev_open(struct inode *inode, struct file *filp)
{
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	return 0;
}

/*
 * Free any memory in @free but not in @dont.
 */
static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
				  struct kvm_memory_slot *dont)
{
	int i;

	if (!dont || free->phys_mem != dont->phys_mem)
		if (free->phys_mem) {
			for (i = 0; i < free->npages; ++i)
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				if (free->phys_mem[i])
					__free_page(free->phys_mem[i]);
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			vfree(free->phys_mem);
		}

	if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
		vfree(free->dirty_bitmap);

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	free->phys_mem = NULL;
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	free->npages = 0;
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	free->dirty_bitmap = NULL;
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}

static void kvm_free_physmem(struct kvm *kvm)
{
	int i;

	for (i = 0; i < kvm->nmemslots; ++i)
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		kvm_free_physmem_slot(&kvm->memslots[i], NULL);
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}

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static void free_pio_guest_pages(struct kvm_vcpu *vcpu)
{
	int i;

	for (i = 0; i < 2; ++i)
		if (vcpu->pio.guest_pages[i]) {
			__free_page(vcpu->pio.guest_pages[i]);
			vcpu->pio.guest_pages[i] = NULL;
		}
}

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static void kvm_free_vcpu(struct kvm_vcpu *vcpu)
{
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	if (!vcpu->vmcs)
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		return;

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	vcpu_load(vcpu);
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	kvm_mmu_destroy(vcpu);
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	vcpu_put(vcpu);
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	kvm_arch_ops->vcpu_free(vcpu);
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	free_page((unsigned long)vcpu->run);
	vcpu->run = NULL;
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	free_page((unsigned long)vcpu->pio_data);
	vcpu->pio_data = NULL;
	free_pio_guest_pages(vcpu);
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}

static void kvm_free_vcpus(struct kvm *kvm)
{
	unsigned int i;

	for (i = 0; i < KVM_MAX_VCPUS; ++i)
		kvm_free_vcpu(&kvm->vcpus[i]);
}

static int kvm_dev_release(struct inode *inode, struct file *filp)
{
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	return 0;
}
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static void kvm_destroy_vm(struct kvm *kvm)
{
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	spin_lock(&kvm_lock);
	list_del(&kvm->vm_list);
	spin_unlock(&kvm_lock);
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	kvm_free_vcpus(kvm);
	kvm_free_physmem(kvm);
	kfree(kvm);
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}

static int kvm_vm_release(struct inode *inode, struct file *filp)
{
	struct kvm *kvm = filp->private_data;

	kvm_destroy_vm(kvm);
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	return 0;
}

static void inject_gp(struct kvm_vcpu *vcpu)
{
	kvm_arch_ops->inject_gp(vcpu, 0);
}

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/*
 * Load the pae pdptrs.  Return true is they are all valid.
 */
static int load_pdptrs(struct kvm_vcpu *vcpu, unsigned long cr3)
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{
	gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
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	unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
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	int i;
	u64 pdpte;
	u64 *pdpt;
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	int ret;
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	struct page *page;
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	spin_lock(&vcpu->kvm->lock);
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	page = gfn_to_page(vcpu->kvm, pdpt_gfn);
	/* FIXME: !page - emulate? 0xff? */
	pdpt = kmap_atomic(page, KM_USER0);
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	ret = 1;
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	for (i = 0; i < 4; ++i) {
		pdpte = pdpt[offset + i];
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		if ((pdpte & 1) && (pdpte & 0xfffffff0000001e6ull)) {
			ret = 0;
			goto out;
		}
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	}

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	for (i = 0; i < 4; ++i)
		vcpu->pdptrs[i] = pdpt[offset + i];

out:
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	kunmap_atomic(pdpt, KM_USER0);
	spin_unlock(&vcpu->kvm->lock);

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	return ret;
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}

void set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
	if (cr0 & CR0_RESEVED_BITS) {
		printk(KERN_DEBUG "set_cr0: 0x%lx #GP, reserved bits 0x%lx\n",
		       cr0, vcpu->cr0);
		inject_gp(vcpu);
		return;
	}

	if ((cr0 & CR0_NW_MASK) && !(cr0 & CR0_CD_MASK)) {
		printk(KERN_DEBUG "set_cr0: #GP, CD == 0 && NW == 1\n");
		inject_gp(vcpu);
		return;
	}

	if ((cr0 & CR0_PG_MASK) && !(cr0 & CR0_PE_MASK)) {
		printk(KERN_DEBUG "set_cr0: #GP, set PG flag "
		       "and a clear PE flag\n");
		inject_gp(vcpu);
		return;
	}

	if (!is_paging(vcpu) && (cr0 & CR0_PG_MASK)) {
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#ifdef CONFIG_X86_64
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		if ((vcpu->shadow_efer & EFER_LME)) {
			int cs_db, cs_l;

			if (!is_pae(vcpu)) {
				printk(KERN_DEBUG "set_cr0: #GP, start paging "
				       "in long mode while PAE is disabled\n");
				inject_gp(vcpu);
				return;
			}
			kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
			if (cs_l) {
				printk(KERN_DEBUG "set_cr0: #GP, start paging "
				       "in long mode while CS.L == 1\n");
				inject_gp(vcpu);
				return;

			}
		} else
#endif
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		if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->cr3)) {
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			printk(KERN_DEBUG "set_cr0: #GP, pdptrs "
			       "reserved bits\n");
			inject_gp(vcpu);
			return;
		}

	}

	kvm_arch_ops->set_cr0(vcpu, cr0);
	vcpu->cr0 = cr0;

	spin_lock(&vcpu->kvm->lock);
	kvm_mmu_reset_context(vcpu);
	spin_unlock(&vcpu->kvm->lock);
	return;
}
EXPORT_SYMBOL_GPL(set_cr0);

void lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
{
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	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
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	set_cr0(vcpu, (vcpu->cr0 & ~0x0ful) | (msw & 0x0f));
}
EXPORT_SYMBOL_GPL(lmsw);

void set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
	if (cr4 & CR4_RESEVED_BITS) {
		printk(KERN_DEBUG "set_cr4: #GP, reserved bits\n");
		inject_gp(vcpu);
		return;
	}

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	if (is_long_mode(vcpu)) {
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		if (!(cr4 & CR4_PAE_MASK)) {
			printk(KERN_DEBUG "set_cr4: #GP, clearing PAE while "
			       "in long mode\n");
			inject_gp(vcpu);
			return;
		}
	} else if (is_paging(vcpu) && !is_pae(vcpu) && (cr4 & CR4_PAE_MASK)
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		   && !load_pdptrs(vcpu, vcpu->cr3)) {
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		printk(KERN_DEBUG "set_cr4: #GP, pdptrs reserved bits\n");
		inject_gp(vcpu);
	}

	if (cr4 & CR4_VMXE_MASK) {
		printk(KERN_DEBUG "set_cr4: #GP, setting VMXE\n");
		inject_gp(vcpu);
		return;
	}
	kvm_arch_ops->set_cr4(vcpu, cr4);
	spin_lock(&vcpu->kvm->lock);
	kvm_mmu_reset_context(vcpu);
	spin_unlock(&vcpu->kvm->lock);
}
EXPORT_SYMBOL_GPL(set_cr4);

void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
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	if (is_long_mode(vcpu)) {
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		if (cr3 & CR3_L_MODE_RESEVED_BITS) {
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			printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
			inject_gp(vcpu);
			return;
		}
	} else {
		if (cr3 & CR3_RESEVED_BITS) {
			printk(KERN_DEBUG "set_cr3: #GP, reserved bits\n");
			inject_gp(vcpu);
			return;
		}
		if (is_paging(vcpu) && is_pae(vcpu) &&
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		    !load_pdptrs(vcpu, cr3)) {
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			printk(KERN_DEBUG "set_cr3: #GP, pdptrs "
			       "reserved bits\n");
			inject_gp(vcpu);
			return;
		}
	}

	vcpu->cr3 = cr3;
	spin_lock(&vcpu->kvm->lock);
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	/*
	 * Does the new cr3 value map to physical memory? (Note, we
	 * catch an invalid cr3 even in real-mode, because it would
	 * cause trouble later on when we turn on paging anyway.)
	 *
	 * A real CPU would silently accept an invalid cr3 and would
	 * attempt to use it - with largely undefined (and often hard
	 * to debug) behavior on the guest side.
	 */
	if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
		inject_gp(vcpu);
	else
		vcpu->mmu.new_cr3(vcpu);
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	spin_unlock(&vcpu->kvm->lock);
}
EXPORT_SYMBOL_GPL(set_cr3);

void set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
{
	if ( cr8 & CR8_RESEVED_BITS) {
		printk(KERN_DEBUG "set_cr8: #GP, reserved bits 0x%lx\n", cr8);
		inject_gp(vcpu);
		return;
	}
	vcpu->cr8 = cr8;
}
EXPORT_SYMBOL_GPL(set_cr8);

void fx_init(struct kvm_vcpu *vcpu)
{
	struct __attribute__ ((__packed__)) fx_image_s {
		u16 control; //fcw
		u16 status; //fsw
		u16 tag; // ftw
		u16 opcode; //fop
		u64 ip; // fpu ip
		u64 operand;// fpu dp
		u32 mxcsr;
		u32 mxcsr_mask;

	} *fx_image;

	fx_save(vcpu->host_fx_image);
	fpu_init();
	fx_save(vcpu->guest_fx_image);
	fx_restore(vcpu->host_fx_image);

	fx_image = (struct fx_image_s *)vcpu->guest_fx_image;
	fx_image->mxcsr = 0x1f80;
	memset(vcpu->guest_fx_image + sizeof(struct fx_image_s),
	       0, FX_IMAGE_SIZE - sizeof(struct fx_image_s));
}
EXPORT_SYMBOL_GPL(fx_init);

630 631 632 633 634 635 636
static void do_remove_write_access(struct kvm_vcpu *vcpu, int slot)
{
	spin_lock(&vcpu->kvm->lock);
	kvm_mmu_slot_remove_write_access(vcpu, slot);
	spin_unlock(&vcpu->kvm->lock);
}

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/*
 * Allocate some memory and give it an address in the guest physical address
 * space.
 *
 * Discontiguous memory is allowed, mostly for framebuffers.
 */
643 644
static int kvm_vm_ioctl_set_memory_region(struct kvm *kvm,
					  struct kvm_memory_region *mem)
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{
	int r;
	gfn_t base_gfn;
	unsigned long npages;
	unsigned long i;
	struct kvm_memory_slot *memslot;
	struct kvm_memory_slot old, new;
	int memory_config_version;

	r = -EINVAL;
	/* General sanity checks */
	if (mem->memory_size & (PAGE_SIZE - 1))
		goto out;
	if (mem->guest_phys_addr & (PAGE_SIZE - 1))
		goto out;
	if (mem->slot >= KVM_MEMORY_SLOTS)
		goto out;
	if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
		goto out;

	memslot = &kvm->memslots[mem->slot];
	base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
	npages = mem->memory_size >> PAGE_SHIFT;

	if (!npages)
		mem->flags &= ~KVM_MEM_LOG_DIRTY_PAGES;

raced:
	spin_lock(&kvm->lock);

	memory_config_version = kvm->memory_config_version;
	new = old = *memslot;

	new.base_gfn = base_gfn;
	new.npages = npages;
	new.flags = mem->flags;

	/* Disallow changing a memory slot's size. */
	r = -EINVAL;
	if (npages && old.npages && npages != old.npages)
		goto out_unlock;

	/* Check for overlaps */
	r = -EEXIST;
	for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
		struct kvm_memory_slot *s = &kvm->memslots[i];

		if (s == memslot)
			continue;
		if (!((base_gfn + npages <= s->base_gfn) ||
		      (base_gfn >= s->base_gfn + s->npages)))
			goto out_unlock;
	}
	/*
	 * Do memory allocations outside lock.  memory_config_version will
	 * detect any races.
	 */
	spin_unlock(&kvm->lock);

	/* Deallocate if slot is being removed */
	if (!npages)
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		new.phys_mem = NULL;
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	/* Free page dirty bitmap if unneeded */
	if (!(new.flags & KVM_MEM_LOG_DIRTY_PAGES))
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		new.dirty_bitmap = NULL;
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	r = -ENOMEM;

	/* Allocate if a slot is being created */
	if (npages && !new.phys_mem) {
		new.phys_mem = vmalloc(npages * sizeof(struct page *));

		if (!new.phys_mem)
			goto out_free;

		memset(new.phys_mem, 0, npages * sizeof(struct page *));
		for (i = 0; i < npages; ++i) {
			new.phys_mem[i] = alloc_page(GFP_HIGHUSER
						     | __GFP_ZERO);
			if (!new.phys_mem[i])
				goto out_free;
727
			set_page_private(new.phys_mem[i],0);
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		}
	}

	/* Allocate page dirty bitmap if needed */
	if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
		unsigned dirty_bytes = ALIGN(npages, BITS_PER_LONG) / 8;

		new.dirty_bitmap = vmalloc(dirty_bytes);
		if (!new.dirty_bitmap)
			goto out_free;
		memset(new.dirty_bitmap, 0, dirty_bytes);
	}

	spin_lock(&kvm->lock);

	if (memory_config_version != kvm->memory_config_version) {
		spin_unlock(&kvm->lock);
		kvm_free_physmem_slot(&new, &old);
		goto raced;
	}

	r = -EAGAIN;
	if (kvm->busy)
		goto out_unlock;

	if (mem->slot >= kvm->nmemslots)
		kvm->nmemslots = mem->slot + 1;

	*memslot = new;
	++kvm->memory_config_version;

	spin_unlock(&kvm->lock);

	for (i = 0; i < KVM_MAX_VCPUS; ++i) {
		struct kvm_vcpu *vcpu;

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		vcpu = vcpu_load_slot(kvm, i);
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		if (!vcpu)
			continue;
767 768
		if (new.flags & KVM_MEM_LOG_DIRTY_PAGES)
			do_remove_write_access(vcpu, mem->slot);
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		kvm_mmu_reset_context(vcpu);
		vcpu_put(vcpu);
	}

	kvm_free_physmem_slot(&old, &new);
	return 0;

out_unlock:
	spin_unlock(&kvm->lock);
out_free:
	kvm_free_physmem_slot(&new, &old);
out:
	return r;
}

/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
787 788
static int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm,
				      struct kvm_dirty_log *log)
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{
	struct kvm_memory_slot *memslot;
	int r, i;
	int n;
793
	int cleared;
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	unsigned long any = 0;

	spin_lock(&kvm->lock);

	/*
	 * Prevent changes to guest memory configuration even while the lock
	 * is not taken.
	 */
	++kvm->busy;
	spin_unlock(&kvm->lock);
	r = -EINVAL;
	if (log->slot >= KVM_MEMORY_SLOTS)
		goto out;

	memslot = &kvm->memslots[log->slot];
	r = -ENOENT;
	if (!memslot->dirty_bitmap)
		goto out;

813
	n = ALIGN(memslot->npages, BITS_PER_LONG) / 8;
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	for (i = 0; !any && i < n/sizeof(long); ++i)
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		any = memslot->dirty_bitmap[i];

	r = -EFAULT;
	if (copy_to_user(log->dirty_bitmap, memslot->dirty_bitmap, n))
		goto out;

	if (any) {
823
		cleared = 0;
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		for (i = 0; i < KVM_MAX_VCPUS; ++i) {
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			struct kvm_vcpu *vcpu;
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			vcpu = vcpu_load_slot(kvm, i);
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			if (!vcpu)
				continue;
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			if (!cleared) {
				do_remove_write_access(vcpu, log->slot);
				memset(memslot->dirty_bitmap, 0, n);
				cleared = 1;
			}
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			kvm_arch_ops->tlb_flush(vcpu);
			vcpu_put(vcpu);
		}
	}

	r = 0;

out:
	spin_lock(&kvm->lock);
	--kvm->busy;
	spin_unlock(&kvm->lock);
	return r;
}

849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915
/*
 * Set a new alias region.  Aliases map a portion of physical memory into
 * another portion.  This is useful for memory windows, for example the PC
 * VGA region.
 */
static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
					 struct kvm_memory_alias *alias)
{
	int r, n;
	struct kvm_mem_alias *p;

	r = -EINVAL;
	/* General sanity checks */
	if (alias->memory_size & (PAGE_SIZE - 1))
		goto out;
	if (alias->guest_phys_addr & (PAGE_SIZE - 1))
		goto out;
	if (alias->slot >= KVM_ALIAS_SLOTS)
		goto out;
	if (alias->guest_phys_addr + alias->memory_size
	    < alias->guest_phys_addr)
		goto out;
	if (alias->target_phys_addr + alias->memory_size
	    < alias->target_phys_addr)
		goto out;

	spin_lock(&kvm->lock);

	p = &kvm->aliases[alias->slot];
	p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
	p->npages = alias->memory_size >> PAGE_SHIFT;
	p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;

	for (n = KVM_ALIAS_SLOTS; n > 0; --n)
		if (kvm->aliases[n - 1].npages)
			break;
	kvm->naliases = n;

	spin_unlock(&kvm->lock);

	vcpu_load(&kvm->vcpus[0]);
	spin_lock(&kvm->lock);
	kvm_mmu_zap_all(&kvm->vcpus[0]);
	spin_unlock(&kvm->lock);
	vcpu_put(&kvm->vcpus[0]);

	return 0;

out:
	return r;
}

static gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
	int i;
	struct kvm_mem_alias *alias;

	for (i = 0; i < kvm->naliases; ++i) {
		alias = &kvm->aliases[i];
		if (gfn >= alias->base_gfn
		    && gfn < alias->base_gfn + alias->npages)
			return alias->target_gfn + gfn - alias->base_gfn;
	}
	return gfn;
}

static struct kvm_memory_slot *__gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
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{
	int i;

	for (i = 0; i < kvm->nmemslots; ++i) {
		struct kvm_memory_slot *memslot = &kvm->memslots[i];

		if (gfn >= memslot->base_gfn
		    && gfn < memslot->base_gfn + memslot->npages)
			return memslot;
	}
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	return NULL;
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}
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struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
{
	gfn = unalias_gfn(kvm, gfn);
	return __gfn_to_memslot(kvm, gfn);
}
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struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
{
	struct kvm_memory_slot *slot;

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	gfn = unalias_gfn(kvm, gfn);
	slot = __gfn_to_memslot(kvm, gfn);
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	if (!slot)
		return NULL;
	return slot->phys_mem[gfn - slot->base_gfn];
}
EXPORT_SYMBOL_GPL(gfn_to_page);

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void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
{
	int i;
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	struct kvm_memory_slot *memslot = NULL;
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	unsigned long rel_gfn;

	for (i = 0; i < kvm->nmemslots; ++i) {
		memslot = &kvm->memslots[i];

		if (gfn >= memslot->base_gfn
		    && gfn < memslot->base_gfn + memslot->npages) {

			if (!memslot || !memslot->dirty_bitmap)
				return;

			rel_gfn = gfn - memslot->base_gfn;

			/* avoid RMW */
			if (!test_bit(rel_gfn, memslot->dirty_bitmap))
				set_bit(rel_gfn, memslot->dirty_bitmap);
			return;
		}
	}
}

static int emulator_read_std(unsigned long addr,
			     unsigned long *val,
			     unsigned int bytes,
			     struct x86_emulate_ctxt *ctxt)
{
	struct kvm_vcpu *vcpu = ctxt->vcpu;
	void *data = val;

	while (bytes) {
		gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
		unsigned offset = addr & (PAGE_SIZE-1);
		unsigned tocopy = min(bytes, (unsigned)PAGE_SIZE - offset);
		unsigned long pfn;
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		struct page *page;
		void *page_virt;
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		if (gpa == UNMAPPED_GVA)
			return X86EMUL_PROPAGATE_FAULT;
		pfn = gpa >> PAGE_SHIFT;
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		page = gfn_to_page(vcpu->kvm, pfn);
		if (!page)
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			return X86EMUL_UNHANDLEABLE;
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		page_virt = kmap_atomic(page, KM_USER0);
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		memcpy(data, page_virt + offset, tocopy);
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		kunmap_atomic(page_virt, KM_USER0);
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		bytes -= tocopy;
		data += tocopy;
		addr += tocopy;
	}

	return X86EMUL_CONTINUE;
}

static int emulator_write_std(unsigned long addr,
			      unsigned long val,
			      unsigned int bytes,
			      struct x86_emulate_ctxt *ctxt)
{
	printk(KERN_ERR "emulator_write_std: addr %lx n %d\n",
	       addr, bytes);
	return X86EMUL_UNHANDLEABLE;
}

static int emulator_read_emulated(unsigned long addr,
				  unsigned long *val,
				  unsigned int bytes,
				  struct x86_emulate_ctxt *ctxt)
{
	struct kvm_vcpu *vcpu = ctxt->vcpu;

	if (vcpu->mmio_read_completed) {
		memcpy(val, vcpu->mmio_data, bytes);
		vcpu->mmio_read_completed = 0;
		return X86EMUL_CONTINUE;
	} else if (emulator_read_std(addr, val, bytes, ctxt)
		   == X86EMUL_CONTINUE)
		return X86EMUL_CONTINUE;
	else {
		gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);
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		if (gpa == UNMAPPED_GVA)
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			return X86EMUL_PROPAGATE_FAULT;
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		vcpu->mmio_needed = 1;
		vcpu->mmio_phys_addr = gpa;
		vcpu->mmio_size = bytes;
		vcpu->mmio_is_write = 0;

		return X86EMUL_UNHANDLEABLE;
	}
}

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static int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
			       unsigned long val, int bytes)
{
	struct page *page;
	void *virt;

	if (((gpa + bytes - 1) >> PAGE_SHIFT) != (gpa >> PAGE_SHIFT))
		return 0;
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	page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
	if (!page)
1056 1057
		return 0;
	kvm_mmu_pre_write(vcpu, gpa, bytes);
1058
	mark_page_dirty(vcpu->kvm, gpa >> PAGE_SHIFT);
1059 1060 1061 1062 1063 1064 1065
	virt = kmap_atomic(page, KM_USER0);
	memcpy(virt + offset_in_page(gpa), &val, bytes);
	kunmap_atomic(virt, KM_USER0);
	kvm_mmu_post_write(vcpu, gpa, bytes);
	return 1;
}

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static int emulator_write_emulated(unsigned long addr,
				   unsigned long val,
				   unsigned int bytes,
				   struct x86_emulate_ctxt *ctxt)
{
	struct kvm_vcpu *vcpu = ctxt->vcpu;
	gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, addr);

	if (gpa == UNMAPPED_GVA)
		return X86EMUL_PROPAGATE_FAULT;

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	if (emulator_write_phys(vcpu, gpa, val, bytes))
		return X86EMUL_CONTINUE;

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	vcpu->mmio_needed = 1;
	vcpu->mmio_phys_addr = gpa;
	vcpu->mmio_size = bytes;
	vcpu->mmio_is_write = 1;
	memcpy(vcpu->mmio_data, &val, bytes);

	return X86EMUL_CONTINUE;
}

static int emulator_cmpxchg_emulated(unsigned long addr,
				     unsigned long old,
				     unsigned long new,
				     unsigned int bytes,
				     struct x86_emulate_ctxt *ctxt)
{
	static int reported;

	if (!reported) {
		reported = 1;
		printk(KERN_WARNING "kvm: emulating exchange as write\n");
	}
	return emulator_write_emulated(addr, new, bytes, ctxt);
}

1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127
#ifdef CONFIG_X86_32

static int emulator_cmpxchg8b_emulated(unsigned long addr,
				       unsigned long old_lo,
				       unsigned long old_hi,
				       unsigned long new_lo,
				       unsigned long new_hi,
				       struct x86_emulate_ctxt *ctxt)
{
	static int reported;
	int r;

	if (!reported) {
		reported = 1;
		printk(KERN_WARNING "kvm: emulating exchange8b as write\n");
	}
	r = emulator_write_emulated(addr, new_lo, 4, ctxt);
	if (r != X86EMUL_CONTINUE)
		return r;
	return emulator_write_emulated(addr+4, new_hi, 4, ctxt);
}

#endif

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static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
	return kvm_arch_ops->get_segment_base(vcpu, seg);
}

int emulate_invlpg(struct kvm_vcpu *vcpu, gva_t address)
{
	return X86EMUL_CONTINUE;
}

int emulate_clts(struct kvm_vcpu *vcpu)
{
1140
	unsigned long cr0;
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	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
	cr0 = vcpu->cr0 & ~CR0_TS_MASK;
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	kvm_arch_ops->set_cr0(vcpu, cr0);
	return X86EMUL_CONTINUE;
}

int emulator_get_dr(struct x86_emulate_ctxt* ctxt, int dr, unsigned long *dest)
{
	struct kvm_vcpu *vcpu = ctxt->vcpu;

	switch (dr) {
	case 0 ... 3:
		*dest = kvm_arch_ops->get_dr(vcpu, dr);
		return X86EMUL_CONTINUE;
	default:
		printk(KERN_DEBUG "%s: unexpected dr %u\n",
		       __FUNCTION__, dr);
		return X86EMUL_UNHANDLEABLE;
	}
}

int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
{
	unsigned long mask = (ctxt->mode == X86EMUL_MODE_PROT64) ? ~0ULL : ~0U;
	int exception;

	kvm_arch_ops->set_dr(ctxt->vcpu, dr, value & mask, &exception);
	if (exception) {
		/* FIXME: better handling */
		return X86EMUL_UNHANDLEABLE;
	}
	return X86EMUL_CONTINUE;
}

static void report_emulation_failure(struct x86_emulate_ctxt *ctxt)
{
	static int reported;
	u8 opcodes[4];
	unsigned long rip = ctxt->vcpu->rip;
	unsigned long rip_linear;

	rip_linear = rip + get_segment_base(ctxt->vcpu, VCPU_SREG_CS);

	if (reported)
		return;

	emulator_read_std(rip_linear, (void *)opcodes, 4, ctxt);

	printk(KERN_ERR "emulation failed but !mmio_needed?"
	       " rip %lx %02x %02x %02x %02x\n",
	       rip, opcodes[0], opcodes[1], opcodes[2], opcodes[3]);
	reported = 1;
}

struct x86_emulate_ops emulate_ops = {
	.read_std            = emulator_read_std,
	.write_std           = emulator_write_std,
	.read_emulated       = emulator_read_emulated,
	.write_emulated      = emulator_write_emulated,
	.cmpxchg_emulated    = emulator_cmpxchg_emulated,
1202 1203 1204
#ifdef CONFIG_X86_32
	.cmpxchg8b_emulated  = emulator_cmpxchg8b_emulated,
#endif
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};

int emulate_instruction(struct kvm_vcpu *vcpu,
			struct kvm_run *run,
			unsigned long cr2,
			u16 error_code)
{
	struct x86_emulate_ctxt emulate_ctxt;
	int r;
	int cs_db, cs_l;

	kvm_arch_ops->cache_regs(vcpu);

	kvm_arch_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);

	emulate_ctxt.vcpu = vcpu;
	emulate_ctxt.eflags = kvm_arch_ops->get_rflags(vcpu);
	emulate_ctxt.cr2 = cr2;
	emulate_ctxt.mode = (emulate_ctxt.eflags & X86_EFLAGS_VM)
		? X86EMUL_MODE_REAL : cs_l
		? X86EMUL_MODE_PROT64 :	cs_db
		? X86EMUL_MODE_PROT32 : X86EMUL_MODE_PROT16;

	if (emulate_ctxt.mode == X86EMUL_MODE_PROT64) {
		emulate_ctxt.cs_base = 0;
		emulate_ctxt.ds_base = 0;
		emulate_ctxt.es_base = 0;
		emulate_ctxt.ss_base = 0;
	} else {
		emulate_ctxt.cs_base = get_segment_base(vcpu, VCPU_SREG_CS);
		emulate_ctxt.ds_base = get_segment_base(vcpu, VCPU_SREG_DS);
		emulate_ctxt.es_base = get_segment_base(vcpu, VCPU_SREG_ES);
		emulate_ctxt.ss_base = get_segment_base(vcpu, VCPU_SREG_SS);
	}

	emulate_ctxt.gs_base = get_segment_base(vcpu, VCPU_SREG_GS);
	emulate_ctxt.fs_base = get_segment_base(vcpu, VCPU_SREG_FS);

	vcpu->mmio_is_write = 0;
	r = x86_emulate_memop(&emulate_ctxt, &emulate_ops);

	if ((r || vcpu->mmio_is_write) && run) {
		run->mmio.phys_addr = vcpu->mmio_phys_addr;
		memcpy(run->mmio.data, vcpu->mmio_data, 8);
		run->mmio.len = vcpu->mmio_size;
		run->mmio.is_write = vcpu->mmio_is_write;
	}

	if (r) {
1254 1255
		if (kvm_mmu_unprotect_page_virt(vcpu, cr2))
			return EMULATE_DONE;
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		if (!vcpu->mmio_needed) {
			report_emulation_failure(&emulate_ctxt);
			return EMULATE_FAIL;
		}
		return EMULATE_DO_MMIO;
	}

	kvm_arch_ops->decache_regs(vcpu);
	kvm_arch_ops->set_rflags(vcpu, emulate_ctxt.eflags);

	if (vcpu->mmio_is_write)
		return EMULATE_DO_MMIO;

	return EMULATE_DONE;
}
EXPORT_SYMBOL_GPL(emulate_instruction);

1273 1274 1275 1276
int kvm_hypercall(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
	unsigned long nr, a0, a1, a2, a3, a4, a5, ret;

1277
	kvm_arch_ops->cache_regs(vcpu);
1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300
	ret = -KVM_EINVAL;
#ifdef CONFIG_X86_64
	if (is_long_mode(vcpu)) {
		nr = vcpu->regs[VCPU_REGS_RAX];
		a0 = vcpu->regs[VCPU_REGS_RDI];
		a1 = vcpu->regs[VCPU_REGS_RSI];
		a2 = vcpu->regs[VCPU_REGS_RDX];
		a3 = vcpu->regs[VCPU_REGS_RCX];
		a4 = vcpu->regs[VCPU_REGS_R8];
		a5 = vcpu->regs[VCPU_REGS_R9];
	} else
#endif
	{
		nr = vcpu->regs[VCPU_REGS_RBX] & -1u;
		a0 = vcpu->regs[VCPU_REGS_RAX] & -1u;
		a1 = vcpu->regs[VCPU_REGS_RCX] & -1u;
		a2 = vcpu->regs[VCPU_REGS_RDX] & -1u;
		a3 = vcpu->regs[VCPU_REGS_RSI] & -1u;
		a4 = vcpu->regs[VCPU_REGS_RDI] & -1u;
		a5 = vcpu->regs[VCPU_REGS_RBP] & -1u;
	}
	switch (nr) {
	default:
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
		run->hypercall.args[0] = a0;
		run->hypercall.args[1] = a1;
		run->hypercall.args[2] = a2;
		run->hypercall.args[3] = a3;
		run->hypercall.args[4] = a4;
		run->hypercall.args[5] = a5;
		run->hypercall.ret = ret;
		run->hypercall.longmode = is_long_mode(vcpu);
		kvm_arch_ops->decache_regs(vcpu);
		return 0;
1311 1312
	}
	vcpu->regs[VCPU_REGS_RAX] = ret;
1313
	kvm_arch_ops->decache_regs(vcpu);
1314 1315 1316 1317
	return 1;
}
EXPORT_SYMBOL_GPL(kvm_hypercall);

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static u64 mk_cr_64(u64 curr_cr, u32 new_val)
{
	return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
}

void realmode_lgdt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
{
	struct descriptor_table dt = { limit, base };

	kvm_arch_ops->set_gdt(vcpu, &dt);
}

void realmode_lidt(struct kvm_vcpu *vcpu, u16 limit, unsigned long base)
{
	struct descriptor_table dt = { limit, base };

	kvm_arch_ops->set_idt(vcpu, &dt);
}

void realmode_lmsw(struct kvm_vcpu *vcpu, unsigned long msw,
		   unsigned long *rflags)
{
	lmsw(vcpu, msw);
	*rflags = kvm_arch_ops->get_rflags(vcpu);
}

unsigned long realmode_get_cr(struct kvm_vcpu *vcpu, int cr)
{
1346
	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
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	switch (cr) {
	case 0:
		return vcpu->cr0;
	case 2:
		return vcpu->cr2;
	case 3:
		return vcpu->cr3;
	case 4:
		return vcpu->cr4;
	default:
		vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
		return 0;
	}
}

void realmode_set_cr(struct kvm_vcpu *vcpu, int cr, unsigned long val,
		     unsigned long *rflags)
{
	switch (cr) {
	case 0:
		set_cr0(vcpu, mk_cr_64(vcpu->cr0, val));
		*rflags = kvm_arch_ops->get_rflags(vcpu);
		break;
	case 2:
		vcpu->cr2 = val;
		break;
	case 3:
		set_cr3(vcpu, val);
		break;
	case 4:
		set_cr4(vcpu, mk_cr_64(vcpu->cr4, val));
		break;
	default:
		vcpu_printf(vcpu, "%s: unexpected cr %u\n", __FUNCTION__, cr);
	}
}

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/*
 * Register the para guest with the host:
 */
static int vcpu_register_para(struct kvm_vcpu *vcpu, gpa_t para_state_gpa)
{
	struct kvm_vcpu_para_state *para_state;
	hpa_t para_state_hpa, hypercall_hpa;
	struct page *para_state_page;
	unsigned char *hypercall;
	gpa_t hypercall_gpa;

	printk(KERN_DEBUG "kvm: guest trying to enter paravirtual mode\n");
	printk(KERN_DEBUG ".... para_state_gpa: %08Lx\n", para_state_gpa);

	/*
	 * Needs to be page aligned:
	 */
	if (para_state_gpa != PAGE_ALIGN(para_state_gpa))
		goto err_gp;

	para_state_hpa = gpa_to_hpa(vcpu, para_state_gpa);
	printk(KERN_DEBUG ".... para_state_hpa: %08Lx\n", para_state_hpa);
	if (is_error_hpa(para_state_hpa))
		goto err_gp;

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	mark_page_dirty(vcpu->kvm, para_state_gpa >> PAGE_SHIFT);
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	para_state_page = pfn_to_page(para_state_hpa >> PAGE_SHIFT);
	para_state = kmap_atomic(para_state_page, KM_USER0);

	printk(KERN_DEBUG "....  guest version: %d\n", para_state->guest_version);
	printk(KERN_DEBUG "....           size: %d\n", para_state->size);

	para_state->host_version = KVM_PARA_API_VERSION;
	/*
	 * We cannot support guests that try to register themselves
	 * with a newer API version than the host supports:
	 */
	if (para_state->guest_version > KVM_PARA_API_VERSION) {
		para_state->ret = -KVM_EINVAL;
		goto err_kunmap_skip;
	}

	hypercall_gpa = para_state->hypercall_gpa;
	hypercall_hpa = gpa_to_hpa(vcpu, hypercall_gpa);
	printk(KERN_DEBUG ".... hypercall_hpa: %08Lx\n", hypercall_hpa);
	if (is_error_hpa(hypercall_hpa)) {
		para_state->ret = -KVM_EINVAL;
		goto err_kunmap_skip;
	}

	printk(KERN_DEBUG "kvm: para guest successfully registered.\n");
	vcpu->para_state_page = para_state_page;
	vcpu->para_state_gpa = para_state_gpa;
	vcpu->hypercall_gpa = hypercall_gpa;

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	mark_page_dirty(vcpu->kvm, hypercall_gpa >> PAGE_SHIFT);
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	hypercall = kmap_atomic(pfn_to_page(hypercall_hpa >> PAGE_SHIFT),
				KM_USER1) + (hypercall_hpa & ~PAGE_MASK);
	kvm_arch_ops->patch_hypercall(vcpu, hypercall);
	kunmap_atomic(hypercall, KM_USER1);

	para_state->ret = 0;
err_kunmap_skip:
	kunmap_atomic(para_state, KM_USER0);
	return 0;
err_gp:
	return 1;
}

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int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
	u64 data;

	switch (msr) {
	case 0xc0010010: /* SYSCFG */
	case 0xc0010015: /* HWCR */
	case MSR_IA32_PLATFORM_ID:
	case MSR_IA32_P5_MC_ADDR:
	case MSR_IA32_P5_MC_TYPE:
	case MSR_IA32_MC0_CTL:
	case MSR_IA32_MCG_STATUS:
	case MSR_IA32_MCG_CAP:
	case MSR_IA32_MC0_MISC:
	case MSR_IA32_MC0_MISC+4:
	case MSR_IA32_MC0_MISC+8:
	case MSR_IA32_MC0_MISC+12:
	case MSR_IA32_MC0_MISC+16:
	case MSR_IA32_UCODE_REV:
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	case MSR_IA32_PERF_STATUS:
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		/* MTRR registers */
	case 0xfe:
	case 0x200 ... 0x2ff:
		data = 0;
		break;
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	case 0xcd: /* fsb frequency */
		data = 3;
		break;
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	case MSR_IA32_APICBASE:
		data = vcpu->apic_base;
		break;
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	case MSR_IA32_MISC_ENABLE:
		data = vcpu->ia32_misc_enable_msr;
		break;
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#ifdef CONFIG_X86_64
	case MSR_EFER:
		data = vcpu->shadow_efer;
		break;
#endif
	default:
		printk(KERN_ERR "kvm: unhandled rdmsr: 0x%x\n", msr);
		return 1;
	}
	*pdata = data;
	return 0;
}
EXPORT_SYMBOL_GPL(kvm_get_msr_common);

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/*
 * Reads an msr value (of 'msr_index') into 'pdata'.
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
static int get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
{
	return kvm_arch_ops->get_msr(vcpu, msr_index, pdata);
}

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#ifdef CONFIG_X86_64
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static void set_efer(struct kvm_vcpu *vcpu, u64 efer)
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{
	if (efer & EFER_RESERVED_BITS) {
		printk(KERN_DEBUG "set_efer: 0x%llx #GP, reserved bits\n",
		       efer);
		inject_gp(vcpu);
		return;
	}

	if (is_paging(vcpu)
	    && (vcpu->shadow_efer & EFER_LME) != (efer & EFER_LME)) {
		printk(KERN_DEBUG "set_efer: #GP, change LME while paging\n");
		inject_gp(vcpu);
		return;
	}

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	kvm_arch_ops->set_efer(vcpu, efer);

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	efer &= ~EFER_LMA;
	efer |= vcpu->shadow_efer & EFER_LMA;

	vcpu->shadow_efer = efer;
}

#endif

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int kvm_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
	switch (msr) {
#ifdef CONFIG_X86_64
	case MSR_EFER:
		set_efer(vcpu, data);
		break;
#endif
	case MSR_IA32_MC0_STATUS:
		printk(KERN_WARNING "%s: MSR_IA32_MC0_STATUS 0x%llx, nop\n",
		       __FUNCTION__, data);
		break;
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	case MSR_IA32_MCG_STATUS:
		printk(KERN_WARNING "%s: MSR_IA32_MCG_STATUS 0x%llx, nop\n",
			__FUNCTION__, data);
		break;
1555 1556 1557 1558 1559 1560 1561
	case MSR_IA32_UCODE_REV:
	case MSR_IA32_UCODE_WRITE:
	case 0x200 ... 0x2ff: /* MTRRs */
		break;
	case MSR_IA32_APICBASE:
		vcpu->apic_base = data;
		break;
1562 1563 1564
	case MSR_IA32_MISC_ENABLE:
		vcpu->ia32_misc_enable_msr = data;
		break;
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	/*
	 * This is the 'probe whether the host is KVM' logic:
	 */
	case MSR_KVM_API_MAGIC:
		return vcpu_register_para(vcpu, data);

1571 1572 1573 1574 1575 1576 1577 1578
	default:
		printk(KERN_ERR "kvm: unhandled wrmsr: 0x%x\n", msr);
		return 1;
	}
	return 0;
}
EXPORT_SYMBOL_GPL(kvm_set_msr_common);

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/*
 * Writes msr value into into the appropriate "register".
 * Returns 0 on success, non-0 otherwise.
 * Assumes vcpu_load() was already called.
 */
static int set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
{
	return kvm_arch_ops->set_msr(vcpu, msr_index, data);
}

void kvm_resched(struct kvm_vcpu *vcpu)
{
	vcpu_put(vcpu);
	cond_resched();
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	vcpu_load(vcpu);
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}
EXPORT_SYMBOL_GPL(kvm_resched);

void load_msrs(struct vmx_msr_entry *e, int n)
{
	int i;

	for (i = 0; i < n; ++i)
		wrmsrl(e[i].index, e[i].data);
}
EXPORT_SYMBOL_GPL(load_msrs);

void save_msrs(struct vmx_msr_entry *e, int n)
{
	int i;

	for (i = 0; i < n; ++i)
		rdmsrl(e[i].index, e[i].data);
}
EXPORT_SYMBOL_GPL(save_msrs);

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void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
{
	int i;
	u32 function;
	struct kvm_cpuid_entry *e, *best;

	kvm_arch_ops->cache_regs(vcpu);
	function = vcpu->regs[VCPU_REGS_RAX];
	vcpu->regs[VCPU_REGS_RAX] = 0;
	vcpu->regs[VCPU_REGS_RBX] = 0;
	vcpu->regs[VCPU_REGS_RCX] = 0;
	vcpu->regs[VCPU_REGS_RDX] = 0;
	best = NULL;
	for (i = 0; i < vcpu->cpuid_nent; ++i) {
		e = &vcpu->cpuid_entries[i];
		if (e->function == function) {
			best = e;
			break;
		}
		/*
		 * Both basic or both extended?
		 */
		if (((e->function ^ function) & 0x80000000) == 0)
			if (!best || e->function > best->function)
				best = e;
	}
	if (best) {
		vcpu->regs[VCPU_REGS_RAX] = best->eax;
		vcpu->regs[VCPU_REGS_RBX] = best->ebx;
		vcpu->regs[VCPU_REGS_RCX] = best->ecx;
		vcpu->regs[VCPU_REGS_RDX] = best->edx;
	}
	kvm_arch_ops->decache_regs(vcpu);
	kvm_arch_ops->skip_emulated_instruction(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);

1652
static int pio_copy_data(struct kvm_vcpu *vcpu)
1653
{
1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682
	void *p = vcpu->pio_data;
	void *q;
	unsigned bytes;
	int nr_pages = vcpu->pio.guest_pages[1] ? 2 : 1;

	kvm_arch_ops->vcpu_put(vcpu);
	q = vmap(vcpu->pio.guest_pages, nr_pages, VM_READ|VM_WRITE,
		 PAGE_KERNEL);
	if (!q) {
		kvm_arch_ops->vcpu_load(vcpu);
		free_pio_guest_pages(vcpu);
		return -ENOMEM;
	}
	q += vcpu->pio.guest_page_offset;
	bytes = vcpu->pio.size * vcpu->pio.cur_count;
	if (vcpu->pio.in)
		memcpy(q, p, bytes);
	else
		memcpy(p, q, bytes);
	q -= vcpu->pio.guest_page_offset;
	vunmap(q);
	kvm_arch_ops->vcpu_load(vcpu);
	free_pio_guest_pages(vcpu);
	return 0;
}

static int complete_pio(struct kvm_vcpu *vcpu)
{
	struct kvm_pio_request *io = &vcpu->pio;
1683
	long delta;
1684
	int r;
1685 1686 1687 1688

	kvm_arch_ops->cache_regs(vcpu);

	if (!io->string) {
1689 1690
		if (io->in)
			memcpy(&vcpu->regs[VCPU_REGS_RAX], vcpu->pio_data,
1691 1692
			       io->size);
	} else {
1693 1694 1695 1696 1697 1698 1699 1700
		if (io->in) {
			r = pio_copy_data(vcpu);
			if (r) {
				kvm_arch_ops->cache_regs(vcpu);
				return r;
			}
		}

1701 1702
		delta = 1;
		if (io->rep) {
1703
			delta *= io->cur_count;
1704 1705 1706 1707 1708 1709
			/*
			 * The size of the register should really depend on
			 * current address size.
			 */
			vcpu->regs[VCPU_REGS_RCX] -= delta;
		}
1710
		if (io->down)
1711 1712
			delta = -delta;
		delta *= io->size;
1713
		if (io->in)
1714 1715 1716 1717 1718 1719 1720 1721 1722
			vcpu->regs[VCPU_REGS_RDI] += delta;
		else
			vcpu->regs[VCPU_REGS_RSI] += delta;
	}

	vcpu->run->io_completed = 0;

	kvm_arch_ops->decache_regs(vcpu);

1723 1724 1725 1726 1727 1728
	io->count -= io->cur_count;
	io->cur_count = 0;

	if (!io->count)
		kvm_arch_ops->skip_emulated_instruction(vcpu);
	return 0;
1729 1730
}

1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 1764 1765 1766 1767 1768 1769 1770 1771 1772 1773 1774 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792 1793 1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813
int kvm_setup_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in,
		  int size, unsigned long count, int string, int down,
		  gva_t address, int rep, unsigned port)
{
	unsigned now, in_page;
	int i;
	int nr_pages = 1;
	struct page *page;

	vcpu->run->exit_reason = KVM_EXIT_IO;
	vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
	vcpu->run->io.size = size;
	vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
	vcpu->run->io.count = count;
	vcpu->run->io.port = port;
	vcpu->pio.count = count;
	vcpu->pio.cur_count = count;
	vcpu->pio.size = size;
	vcpu->pio.in = in;
	vcpu->pio.string = string;
	vcpu->pio.down = down;
	vcpu->pio.guest_page_offset = offset_in_page(address);
	vcpu->pio.rep = rep;

	if (!string) {
		kvm_arch_ops->cache_regs(vcpu);
		memcpy(vcpu->pio_data, &vcpu->regs[VCPU_REGS_RAX], 4);
		kvm_arch_ops->decache_regs(vcpu);
		return 0;
	}

	if (!count) {
		kvm_arch_ops->skip_emulated_instruction(vcpu);
		return 1;
	}

	now = min(count, PAGE_SIZE / size);

	if (!down)
		in_page = PAGE_SIZE - offset_in_page(address);
	else
		in_page = offset_in_page(address) + size;
	now = min(count, (unsigned long)in_page / size);
	if (!now) {
		/*
		 * String I/O straddles page boundary.  Pin two guest pages
		 * so that we satisfy atomicity constraints.  Do just one
		 * transaction to avoid complexity.
		 */
		nr_pages = 2;
		now = 1;
	}
	if (down) {
		/*
		 * String I/O in reverse.  Yuck.  Kill the guest, fix later.
		 */
		printk(KERN_ERR "kvm: guest string pio down\n");
		inject_gp(vcpu);
		return 1;
	}
	vcpu->run->io.count = now;
	vcpu->pio.cur_count = now;

	for (i = 0; i < nr_pages; ++i) {
		spin_lock(&vcpu->kvm->lock);
		page = gva_to_page(vcpu, address + i * PAGE_SIZE);
		if (page)
			get_page(page);
		vcpu->pio.guest_pages[i] = page;
		spin_unlock(&vcpu->kvm->lock);
		if (!page) {
			inject_gp(vcpu);
			free_pio_guest_pages(vcpu);
			return 1;
		}
	}

	if (!vcpu->pio.in)
		return pio_copy_data(vcpu);
	return 0;
}
EXPORT_SYMBOL_GPL(kvm_setup_pio);

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static int kvm_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
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{
	int r;
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	sigset_t sigsaved;
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	vcpu_load(vcpu);
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	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

1824 1825 1826
	/* re-sync apic's tpr */
	vcpu->cr8 = kvm_run->cr8;

1827
	if (kvm_run->io_completed) {
1828 1829 1830 1831 1832
		if (vcpu->pio.cur_count) {
			r = complete_pio(vcpu);
			if (r)
				goto out;
		} else {
1833 1834 1835
			memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);
			vcpu->mmio_read_completed = 1;
		}
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	}

	vcpu->mmio_needed = 0;

1840
	if (kvm_run->exit_reason == KVM_EXIT_HYPERCALL) {
1841 1842 1843 1844 1845
		kvm_arch_ops->cache_regs(vcpu);
		vcpu->regs[VCPU_REGS_RAX] = kvm_run->hypercall.ret;
		kvm_arch_ops->decache_regs(vcpu);
	}

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	r = kvm_arch_ops->run(vcpu, kvm_run);

1848
out:
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	if (vcpu->sigset_active)
		sigprocmask(SIG_SETMASK, &sigsaved, NULL);

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	vcpu_put(vcpu);
	return r;
}

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static int kvm_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu,
				   struct kvm_regs *regs)
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{
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	vcpu_load(vcpu);
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	kvm_arch_ops->cache_regs(vcpu);

	regs->rax = vcpu->regs[VCPU_REGS_RAX];
	regs->rbx = vcpu->regs[VCPU_REGS_RBX];
	regs->rcx = vcpu->regs[VCPU_REGS_RCX];
	regs->rdx = vcpu->regs[VCPU_REGS_RDX];
	regs->rsi = vcpu->regs[VCPU_REGS_RSI];
	regs->rdi = vcpu->regs[VCPU_REGS_RDI];
	regs->rsp = vcpu->regs[VCPU_REGS_RSP];
	regs->rbp = vcpu->regs[VCPU_REGS_RBP];
1871
#ifdef CONFIG_X86_64
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	regs->r8 = vcpu->regs[VCPU_REGS_R8];
	regs->r9 = vcpu->regs[VCPU_REGS_R9];
	regs->r10 = vcpu->regs[VCPU_REGS_R10];
	regs->r11 = vcpu->regs[VCPU_REGS_R11];
	regs->r12 = vcpu->regs[VCPU_REGS_R12];
	regs->r13 = vcpu->regs[VCPU_REGS_R13];
	regs->r14 = vcpu->regs[VCPU_REGS_R14];
	regs->r15 = vcpu->regs[VCPU_REGS_R15];
#endif

	regs->rip = vcpu->rip;
	regs->rflags = kvm_arch_ops->get_rflags(vcpu);

	/*
	 * Don't leak debug flags in case they were set for guest debugging
	 */
	if (vcpu->guest_debug.enabled && vcpu->guest_debug.singlestep)
		regs->rflags &= ~(X86_EFLAGS_TF | X86_EFLAGS_RF);

	vcpu_put(vcpu);

	return 0;
}

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static int kvm_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu,
				   struct kvm_regs *regs)
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{
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	vcpu_load(vcpu);
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	vcpu->regs[VCPU_REGS_RAX] = regs->rax;
	vcpu->regs[VCPU_REGS_RBX] = regs->rbx;
	vcpu->regs[VCPU_REGS_RCX] = regs->rcx;
	vcpu->regs[VCPU_REGS_RDX] = regs->rdx;
	vcpu->regs[VCPU_REGS_RSI] = regs->rsi;
	vcpu->regs[VCPU_REGS_RDI] = regs->rdi;
	vcpu->regs[VCPU_REGS_RSP] = regs->rsp;
	vcpu->regs[VCPU_REGS_RBP] = regs->rbp;
1909
#ifdef CONFIG_X86_64
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	vcpu->regs[VCPU_REGS_R8] = regs->r8;
	vcpu->regs[VCPU_REGS_R9] = regs->r9;
	vcpu->regs[VCPU_REGS_R10] = regs->r10;
	vcpu->regs[VCPU_REGS_R11] = regs->r11;
	vcpu->regs[VCPU_REGS_R12] = regs->r12;
	vcpu->regs[VCPU_REGS_R13] = regs->r13;
	vcpu->regs[VCPU_REGS_R14] = regs->r14;
	vcpu->regs[VCPU_REGS_R15] = regs->r15;
#endif

	vcpu->rip = regs->rip;
	kvm_arch_ops->set_rflags(vcpu, regs->rflags);

	kvm_arch_ops->decache_regs(vcpu);

	vcpu_put(vcpu);

	return 0;
}

static void get_segment(struct kvm_vcpu *vcpu,
			struct kvm_segment *var, int seg)
{
	return kvm_arch_ops->get_segment(vcpu, var, seg);
}

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static int kvm_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
				    struct kvm_sregs *sregs)
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1938 1939 1940
{
	struct descriptor_table dt;

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1941
	vcpu_load(vcpu);
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	get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
	get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
	get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
	get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
	get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
	get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);

	get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
	get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);

	kvm_arch_ops->get_idt(vcpu, &dt);
	sregs->idt.limit = dt.limit;
	sregs->idt.base = dt.base;
	kvm_arch_ops->get_gdt(vcpu, &dt);
	sregs->gdt.limit = dt.limit;
	sregs->gdt.base = dt.base;

1960
	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);
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	sregs->cr0 = vcpu->cr0;
	sregs->cr2 = vcpu->cr2;
	sregs->cr3 = vcpu->cr3;
	sregs->cr4 = vcpu->cr4;
	sregs->cr8 = vcpu->cr8;
	sregs->efer = vcpu->shadow_efer;
	sregs->apic_base = vcpu->apic_base;

	memcpy(sregs->interrupt_bitmap, vcpu->irq_pending,
	       sizeof sregs->interrupt_bitmap);

	vcpu_put(vcpu);

	return 0;
}

static void set_segment(struct kvm_vcpu *vcpu,
			struct kvm_segment *var, int seg)
{
	return kvm_arch_ops->set_segment(vcpu, var, seg);
}

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1983 1984
static int kvm_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
				    struct kvm_sregs *sregs)
A
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1985 1986 1987 1988 1989
{
	int mmu_reset_needed = 0;
	int i;
	struct descriptor_table dt;

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1990
	vcpu_load(vcpu);
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	dt.limit = sregs->idt.limit;
	dt.base = sregs->idt.base;
	kvm_arch_ops->set_idt(vcpu, &dt);
	dt.limit = sregs->gdt.limit;
	dt.base = sregs->gdt.base;
	kvm_arch_ops->set_gdt(vcpu, &dt);

	vcpu->cr2 = sregs->cr2;
	mmu_reset_needed |= vcpu->cr3 != sregs->cr3;
	vcpu->cr3 = sregs->cr3;

	vcpu->cr8 = sregs->cr8;

	mmu_reset_needed |= vcpu->shadow_efer != sregs->efer;
2006
#ifdef CONFIG_X86_64
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2007 2008 2009 2010
	kvm_arch_ops->set_efer(vcpu, sregs->efer);
#endif
	vcpu->apic_base = sregs->apic_base;

2011 2012
	kvm_arch_ops->decache_cr0_cr4_guest_bits(vcpu);

A
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2013
	mmu_reset_needed |= vcpu->cr0 != sregs->cr0;
2014
	kvm_arch_ops->set_cr0(vcpu, sregs->cr0);
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2015 2016 2017

	mmu_reset_needed |= vcpu->cr4 != sregs->cr4;
	kvm_arch_ops->set_cr4(vcpu, sregs->cr4);
2018 2019
	if (!is_long_mode(vcpu) && is_pae(vcpu))
		load_pdptrs(vcpu, vcpu->cr3);
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2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030

	if (mmu_reset_needed)
		kvm_mmu_reset_context(vcpu);

	memcpy(vcpu->irq_pending, sregs->interrupt_bitmap,
	       sizeof vcpu->irq_pending);
	vcpu->irq_summary = 0;
	for (i = 0; i < NR_IRQ_WORDS; ++i)
		if (vcpu->irq_pending[i])
			__set_bit(i, &vcpu->irq_summary);

2031 2032 2033 2034 2035 2036 2037 2038 2039 2040
	set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
	set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
	set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
	set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
	set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
	set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);

	set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
	set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);

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2041 2042 2043 2044 2045 2046 2047 2048
	vcpu_put(vcpu);

	return 0;
}

/*
 * List of msr numbers which we expose to userspace through KVM_GET_MSRS
 * and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
2049 2050 2051
 *
 * This list is modified at module load time to reflect the
 * capabilities of the host cpu.
A
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2052 2053 2054 2055
 */
static u32 msrs_to_save[] = {
	MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
	MSR_K6_STAR,
2056
#ifdef CONFIG_X86_64
A
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2057 2058 2059 2060 2061
	MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
#endif
	MSR_IA32_TIME_STAMP_COUNTER,
};

2062 2063
static unsigned num_msrs_to_save;

2064 2065 2066 2067
static u32 emulated_msrs[] = {
	MSR_IA32_MISC_ENABLE,
};

2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 2078 2079 2080 2081
static __init void kvm_init_msr_list(void)
{
	u32 dummy[2];
	unsigned i, j;

	for (i = j = 0; i < ARRAY_SIZE(msrs_to_save); i++) {
		if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
			continue;
		if (j < i)
			msrs_to_save[j] = msrs_to_save[i];
		j++;
	}
	num_msrs_to_save = j;
}
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/*
 * Adapt set_msr() to msr_io()'s calling convention
 */
static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
{
	return set_msr(vcpu, index, *data);
}

/*
 * Read or write a bunch of msrs. All parameters are kernel addresses.
 *
 * @return number of msrs set successfully.
 */
A
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static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
A
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2097 2098 2099 2100 2101 2102
		    struct kvm_msr_entry *entries,
		    int (*do_msr)(struct kvm_vcpu *vcpu,
				  unsigned index, u64 *data))
{
	int i;

A
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2103
	vcpu_load(vcpu);
A
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2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118

	for (i = 0; i < msrs->nmsrs; ++i)
		if (do_msr(vcpu, entries[i].index, &entries[i].data))
			break;

	vcpu_put(vcpu);

	return i;
}

/*
 * Read or write a bunch of msrs. Parameters are user addresses.
 *
 * @return number of msrs set successfully.
 */
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static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
A
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2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146
		  int (*do_msr)(struct kvm_vcpu *vcpu,
				unsigned index, u64 *data),
		  int writeback)
{
	struct kvm_msrs msrs;
	struct kvm_msr_entry *entries;
	int r, n;
	unsigned size;

	r = -EFAULT;
	if (copy_from_user(&msrs, user_msrs, sizeof msrs))
		goto out;

	r = -E2BIG;
	if (msrs.nmsrs >= MAX_IO_MSRS)
		goto out;

	r = -ENOMEM;
	size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
	entries = vmalloc(size);
	if (!entries)
		goto out;

	r = -EFAULT;
	if (copy_from_user(entries, user_msrs->entries, size))
		goto out_free;

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	r = n = __msr_io(vcpu, &msrs, entries, do_msr);
A
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2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163 2164 2165
	if (r < 0)
		goto out_free;

	r = -EFAULT;
	if (writeback && copy_to_user(user_msrs->entries, entries, size))
		goto out_free;

	r = n;

out_free:
	vfree(entries);
out:
	return r;
}

/*
 * Translate a guest virtual address to a guest physical address.
 */
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2166 2167
static int kvm_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
				    struct kvm_translation *tr)
A
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2168 2169 2170 2171
{
	unsigned long vaddr = tr->linear_address;
	gpa_t gpa;

A
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2172 2173
	vcpu_load(vcpu);
	spin_lock(&vcpu->kvm->lock);
A
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2174 2175 2176 2177 2178
	gpa = vcpu->mmu.gva_to_gpa(vcpu, vaddr);
	tr->physical_address = gpa;
	tr->valid = gpa != UNMAPPED_GVA;
	tr->writeable = 1;
	tr->usermode = 0;
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	spin_unlock(&vcpu->kvm->lock);
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2180 2181 2182 2183 2184
	vcpu_put(vcpu);

	return 0;
}

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static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
				    struct kvm_interrupt *irq)
A
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2187 2188 2189
{
	if (irq->irq < 0 || irq->irq >= 256)
		return -EINVAL;
A
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	vcpu_load(vcpu);
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	set_bit(irq->irq, vcpu->irq_pending);
	set_bit(irq->irq / BITS_PER_LONG, &vcpu->irq_summary);

	vcpu_put(vcpu);

	return 0;
}

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static int kvm_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
				      struct kvm_debug_guest *dbg)
A
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2202 2203 2204
{
	int r;

A
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	vcpu_load(vcpu);
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	r = kvm_arch_ops->set_guest_debug(vcpu, dbg);

	vcpu_put(vcpu);

	return r;
}

2214 2215 2216 2217 2218 2219 2220 2221 2222 2223
static struct page *kvm_vcpu_nopage(struct vm_area_struct *vma,
				    unsigned long address,
				    int *type)
{
	struct kvm_vcpu *vcpu = vma->vm_file->private_data;
	unsigned long pgoff;
	struct page *page;

	*type = VM_FAULT_MINOR;
	pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
2224 2225 2226 2227 2228
	if (pgoff == 0)
		page = virt_to_page(vcpu->run);
	else if (pgoff == KVM_PIO_PAGE_OFFSET)
		page = virt_to_page(vcpu->pio_data);
	else
2229 2230 2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243
		return NOPAGE_SIGBUS;
	get_page(page);
	return page;
}

static struct vm_operations_struct kvm_vcpu_vm_ops = {
	.nopage = kvm_vcpu_nopage,
};

static int kvm_vcpu_mmap(struct file *file, struct vm_area_struct *vma)
{
	vma->vm_ops = &kvm_vcpu_vm_ops;
	return 0;
}

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static int kvm_vcpu_release(struct inode *inode, struct file *filp)
{
	struct kvm_vcpu *vcpu = filp->private_data;

	fput(vcpu->kvm->filp);
	return 0;
}

static struct file_operations kvm_vcpu_fops = {
	.release        = kvm_vcpu_release,
	.unlocked_ioctl = kvm_vcpu_ioctl,
	.compat_ioctl   = kvm_vcpu_ioctl,
2256
	.mmap           = kvm_vcpu_mmap,
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};

/*
 * Allocates an inode for the vcpu.
 */
static int create_vcpu_fd(struct kvm_vcpu *vcpu)
{
	int fd, r;
	struct inode *inode;
	struct file *file;

	atomic_inc(&vcpu->kvm->filp->f_count);
	inode = kvmfs_inode(&kvm_vcpu_fops);
	if (IS_ERR(inode)) {
		r = PTR_ERR(inode);
		goto out1;
	}

	file = kvmfs_file(inode, vcpu);
	if (IS_ERR(file)) {
		r = PTR_ERR(file);
		goto out2;
	}

	r = get_unused_fd();
	if (r < 0)
		goto out3;
	fd = r;
	fd_install(fd, file);

	return fd;

out3:
	fput(file);
out2:
	iput(inode);
out1:
	fput(vcpu->kvm->filp);
	return r;
}

2298 2299 2300 2301 2302 2303 2304
/*
 * Creates some virtual cpus.  Good luck creating more than one.
 */
static int kvm_vm_ioctl_create_vcpu(struct kvm *kvm, int n)
{
	int r;
	struct kvm_vcpu *vcpu;
2305
	struct page *page;
2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319

	r = -EINVAL;
	if (!valid_vcpu(n))
		goto out;

	vcpu = &kvm->vcpus[n];

	mutex_lock(&vcpu->mutex);

	if (vcpu->vmcs) {
		mutex_unlock(&vcpu->mutex);
		return -EEXIST;
	}

2320 2321 2322 2323 2324 2325
	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
	r = -ENOMEM;
	if (!page)
		goto out_unlock;
	vcpu->run = page_address(page);

2326 2327 2328 2329 2330 2331
	page = alloc_page(GFP_KERNEL | __GFP_ZERO);
	r = -ENOMEM;
	if (!page)
		goto out_free_run;
	vcpu->pio_data = page_address(page);

2332 2333 2334
	vcpu->host_fx_image = (char*)ALIGN((hva_t)vcpu->fx_buf,
					   FX_IMAGE_ALIGN);
	vcpu->guest_fx_image = vcpu->host_fx_image + FX_IMAGE_SIZE;
2335
	vcpu->cr0 = 0x10;
2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353

	r = kvm_arch_ops->vcpu_create(vcpu);
	if (r < 0)
		goto out_free_vcpus;

	r = kvm_mmu_create(vcpu);
	if (r < 0)
		goto out_free_vcpus;

	kvm_arch_ops->vcpu_load(vcpu);
	r = kvm_mmu_setup(vcpu);
	if (r >= 0)
		r = kvm_arch_ops->vcpu_setup(vcpu);
	vcpu_put(vcpu);

	if (r < 0)
		goto out_free_vcpus;

A
Avi Kivity 已提交
2354 2355 2356 2357 2358
	r = create_vcpu_fd(vcpu);
	if (r < 0)
		goto out_free_vcpus;

	return r;
2359 2360 2361

out_free_vcpus:
	kvm_free_vcpu(vcpu);
2362 2363 2364
out_free_run:
	free_page((unsigned long)vcpu->run);
	vcpu->run = NULL;
2365
out_unlock:
2366 2367 2368 2369 2370
	mutex_unlock(&vcpu->mutex);
out:
	return r;
}

2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390
static int kvm_vcpu_ioctl_set_cpuid(struct kvm_vcpu *vcpu,
				    struct kvm_cpuid *cpuid,
				    struct kvm_cpuid_entry __user *entries)
{
	int r;

	r = -E2BIG;
	if (cpuid->nent > KVM_MAX_CPUID_ENTRIES)
		goto out;
	r = -EFAULT;
	if (copy_from_user(&vcpu->cpuid_entries, entries,
			   cpuid->nent * sizeof(struct kvm_cpuid_entry)))
		goto out;
	vcpu->cpuid_nent = cpuid->nent;
	return 0;

out:
	return r;
}

A
Avi Kivity 已提交
2391 2392 2393 2394 2395 2396 2397 2398 2399 2400 2401
static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
{
	if (sigset) {
		sigdelsetmask(sigset, sigmask(SIGKILL)|sigmask(SIGSTOP));
		vcpu->sigset_active = 1;
		vcpu->sigset = *sigset;
	} else
		vcpu->sigset_active = 0;
	return 0;
}

A
Avi Kivity 已提交
2402 2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413 2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 2459 2460 2461 2462
/*
 * fxsave fpu state.  Taken from x86_64/processor.h.  To be killed when
 * we have asm/x86/processor.h
 */
struct fxsave {
	u16	cwd;
	u16	swd;
	u16	twd;
	u16	fop;
	u64	rip;
	u64	rdp;
	u32	mxcsr;
	u32	mxcsr_mask;
	u32	st_space[32];	/* 8*16 bytes for each FP-reg = 128 bytes */
#ifdef CONFIG_X86_64
	u32	xmm_space[64];	/* 16*16 bytes for each XMM-reg = 256 bytes */
#else
	u32	xmm_space[32];	/* 8*16 bytes for each XMM-reg = 128 bytes */
#endif
};

static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;

	vcpu_load(vcpu);

	memcpy(fpu->fpr, fxsave->st_space, 128);
	fpu->fcw = fxsave->cwd;
	fpu->fsw = fxsave->swd;
	fpu->ftwx = fxsave->twd;
	fpu->last_opcode = fxsave->fop;
	fpu->last_ip = fxsave->rip;
	fpu->last_dp = fxsave->rdp;
	memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);

	vcpu_put(vcpu);

	return 0;
}

static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
	struct fxsave *fxsave = (struct fxsave *)vcpu->guest_fx_image;

	vcpu_load(vcpu);

	memcpy(fxsave->st_space, fpu->fpr, 128);
	fxsave->cwd = fpu->fcw;
	fxsave->swd = fpu->fsw;
	fxsave->twd = fpu->ftwx;
	fxsave->fop = fpu->last_opcode;
	fxsave->rip = fpu->last_ip;
	fxsave->rdp = fpu->last_dp;
	memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);

	vcpu_put(vcpu);

	return 0;
}

A
Avi Kivity 已提交
2463 2464
static long kvm_vcpu_ioctl(struct file *filp,
			   unsigned int ioctl, unsigned long arg)
A
Avi Kivity 已提交
2465
{
A
Avi Kivity 已提交
2466
	struct kvm_vcpu *vcpu = filp->private_data;
A
Al Viro 已提交
2467
	void __user *argp = (void __user *)arg;
A
Avi Kivity 已提交
2468 2469 2470
	int r = -EINVAL;

	switch (ioctl) {
2471
	case KVM_RUN:
2472 2473 2474
		r = -EINVAL;
		if (arg)
			goto out;
2475
		r = kvm_vcpu_ioctl_run(vcpu, vcpu->run);
A
Avi Kivity 已提交
2476 2477 2478 2479
		break;
	case KVM_GET_REGS: {
		struct kvm_regs kvm_regs;

A
Avi Kivity 已提交
2480 2481
		memset(&kvm_regs, 0, sizeof kvm_regs);
		r = kvm_vcpu_ioctl_get_regs(vcpu, &kvm_regs);
A
Avi Kivity 已提交
2482 2483 2484
		if (r)
			goto out;
		r = -EFAULT;
A
Al Viro 已提交
2485
		if (copy_to_user(argp, &kvm_regs, sizeof kvm_regs))
A
Avi Kivity 已提交
2486 2487 2488 2489 2490 2491 2492 2493
			goto out;
		r = 0;
		break;
	}
	case KVM_SET_REGS: {
		struct kvm_regs kvm_regs;

		r = -EFAULT;
A
Al Viro 已提交
2494
		if (copy_from_user(&kvm_regs, argp, sizeof kvm_regs))
A
Avi Kivity 已提交
2495
			goto out;
A
Avi Kivity 已提交
2496
		r = kvm_vcpu_ioctl_set_regs(vcpu, &kvm_regs);
A
Avi Kivity 已提交
2497 2498 2499 2500 2501 2502 2503 2504
		if (r)
			goto out;
		r = 0;
		break;
	}
	case KVM_GET_SREGS: {
		struct kvm_sregs kvm_sregs;

A
Avi Kivity 已提交
2505 2506
		memset(&kvm_sregs, 0, sizeof kvm_sregs);
		r = kvm_vcpu_ioctl_get_sregs(vcpu, &kvm_sregs);
A
Avi Kivity 已提交
2507 2508 2509
		if (r)
			goto out;
		r = -EFAULT;
A
Al Viro 已提交
2510
		if (copy_to_user(argp, &kvm_sregs, sizeof kvm_sregs))
A
Avi Kivity 已提交
2511 2512 2513 2514 2515 2516 2517 2518
			goto out;
		r = 0;
		break;
	}
	case KVM_SET_SREGS: {
		struct kvm_sregs kvm_sregs;

		r = -EFAULT;
A
Al Viro 已提交
2519
		if (copy_from_user(&kvm_sregs, argp, sizeof kvm_sregs))
A
Avi Kivity 已提交
2520
			goto out;
A
Avi Kivity 已提交
2521
		r = kvm_vcpu_ioctl_set_sregs(vcpu, &kvm_sregs);
A
Avi Kivity 已提交
2522 2523 2524 2525 2526 2527 2528 2529 2530
		if (r)
			goto out;
		r = 0;
		break;
	}
	case KVM_TRANSLATE: {
		struct kvm_translation tr;

		r = -EFAULT;
A
Al Viro 已提交
2531
		if (copy_from_user(&tr, argp, sizeof tr))
A
Avi Kivity 已提交
2532
			goto out;
A
Avi Kivity 已提交
2533
		r = kvm_vcpu_ioctl_translate(vcpu, &tr);
A
Avi Kivity 已提交
2534 2535 2536
		if (r)
			goto out;
		r = -EFAULT;
A
Al Viro 已提交
2537
		if (copy_to_user(argp, &tr, sizeof tr))
A
Avi Kivity 已提交
2538 2539 2540 2541 2542 2543 2544 2545
			goto out;
		r = 0;
		break;
	}
	case KVM_INTERRUPT: {
		struct kvm_interrupt irq;

		r = -EFAULT;
A
Al Viro 已提交
2546
		if (copy_from_user(&irq, argp, sizeof irq))
A
Avi Kivity 已提交
2547
			goto out;
A
Avi Kivity 已提交
2548
		r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
A
Avi Kivity 已提交
2549 2550 2551 2552 2553 2554 2555 2556 2557
		if (r)
			goto out;
		r = 0;
		break;
	}
	case KVM_DEBUG_GUEST: {
		struct kvm_debug_guest dbg;

		r = -EFAULT;
A
Al Viro 已提交
2558
		if (copy_from_user(&dbg, argp, sizeof dbg))
A
Avi Kivity 已提交
2559
			goto out;
A
Avi Kivity 已提交
2560
		r = kvm_vcpu_ioctl_debug_guest(vcpu, &dbg);
A
Avi Kivity 已提交
2561 2562 2563 2564 2565
		if (r)
			goto out;
		r = 0;
		break;
	}
A
Avi Kivity 已提交
2566 2567 2568 2569 2570 2571
	case KVM_GET_MSRS:
		r = msr_io(vcpu, argp, get_msr, 1);
		break;
	case KVM_SET_MSRS:
		r = msr_io(vcpu, argp, do_set_msr, 0);
		break;
2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583
	case KVM_SET_CPUID: {
		struct kvm_cpuid __user *cpuid_arg = argp;
		struct kvm_cpuid cpuid;

		r = -EFAULT;
		if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
			goto out;
		r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
		if (r)
			goto out;
		break;
	}
A
Avi Kivity 已提交
2584 2585 2586 2587 2588 2589 2590 2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606
	case KVM_SET_SIGNAL_MASK: {
		struct kvm_signal_mask __user *sigmask_arg = argp;
		struct kvm_signal_mask kvm_sigmask;
		sigset_t sigset, *p;

		p = NULL;
		if (argp) {
			r = -EFAULT;
			if (copy_from_user(&kvm_sigmask, argp,
					   sizeof kvm_sigmask))
				goto out;
			r = -EINVAL;
			if (kvm_sigmask.len != sizeof sigset)
				goto out;
			r = -EFAULT;
			if (copy_from_user(&sigset, sigmask_arg->sigset,
					   sizeof sigset))
				goto out;
			p = &sigset;
		}
		r = kvm_vcpu_ioctl_set_sigmask(vcpu, &sigset);
		break;
	}
A
Avi Kivity 已提交
2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631
	case KVM_GET_FPU: {
		struct kvm_fpu fpu;

		memset(&fpu, 0, sizeof fpu);
		r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
		if (r)
			goto out;
		r = -EFAULT;
		if (copy_to_user(argp, &fpu, sizeof fpu))
			goto out;
		r = 0;
		break;
	}
	case KVM_SET_FPU: {
		struct kvm_fpu fpu;

		r = -EFAULT;
		if (copy_from_user(&fpu, argp, sizeof fpu))
			goto out;
		r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
		if (r)
			goto out;
		r = 0;
		break;
	}
A
Avi Kivity 已提交
2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651
	default:
		;
	}
out:
	return r;
}

static long kvm_vm_ioctl(struct file *filp,
			   unsigned int ioctl, unsigned long arg)
{
	struct kvm *kvm = filp->private_data;
	void __user *argp = (void __user *)arg;
	int r = -EINVAL;

	switch (ioctl) {
	case KVM_CREATE_VCPU:
		r = kvm_vm_ioctl_create_vcpu(kvm, arg);
		if (r < 0)
			goto out;
		break;
A
Avi Kivity 已提交
2652 2653 2654 2655
	case KVM_SET_MEMORY_REGION: {
		struct kvm_memory_region kvm_mem;

		r = -EFAULT;
A
Al Viro 已提交
2656
		if (copy_from_user(&kvm_mem, argp, sizeof kvm_mem))
A
Avi Kivity 已提交
2657
			goto out;
2658
		r = kvm_vm_ioctl_set_memory_region(kvm, &kvm_mem);
A
Avi Kivity 已提交
2659 2660 2661 2662 2663 2664 2665 2666
		if (r)
			goto out;
		break;
	}
	case KVM_GET_DIRTY_LOG: {
		struct kvm_dirty_log log;

		r = -EFAULT;
A
Al Viro 已提交
2667
		if (copy_from_user(&log, argp, sizeof log))
A
Avi Kivity 已提交
2668
			goto out;
2669
		r = kvm_vm_ioctl_get_dirty_log(kvm, &log);
A
Avi Kivity 已提交
2670 2671 2672 2673
		if (r)
			goto out;
		break;
	}
2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684
	case KVM_SET_MEMORY_ALIAS: {
		struct kvm_memory_alias alias;

		r = -EFAULT;
		if (copy_from_user(&alias, argp, sizeof alias))
			goto out;
		r = kvm_vm_ioctl_set_memory_alias(kvm, &alias);
		if (r)
			goto out;
		break;
	}
2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701
	default:
		;
	}
out:
	return r;
}

static struct page *kvm_vm_nopage(struct vm_area_struct *vma,
				  unsigned long address,
				  int *type)
{
	struct kvm *kvm = vma->vm_file->private_data;
	unsigned long pgoff;
	struct page *page;

	*type = VM_FAULT_MINOR;
	pgoff = ((address - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff;
A
Avi Kivity 已提交
2702
	page = gfn_to_page(kvm, pgoff);
2703 2704 2705 2706 2707 2708 2709 2710 2711 2712 2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749
	if (!page)
		return NOPAGE_SIGBUS;
	get_page(page);
	return page;
}

static struct vm_operations_struct kvm_vm_vm_ops = {
	.nopage = kvm_vm_nopage,
};

static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
{
	vma->vm_ops = &kvm_vm_vm_ops;
	return 0;
}

static struct file_operations kvm_vm_fops = {
	.release        = kvm_vm_release,
	.unlocked_ioctl = kvm_vm_ioctl,
	.compat_ioctl   = kvm_vm_ioctl,
	.mmap           = kvm_vm_mmap,
};

static int kvm_dev_ioctl_create_vm(void)
{
	int fd, r;
	struct inode *inode;
	struct file *file;
	struct kvm *kvm;

	inode = kvmfs_inode(&kvm_vm_fops);
	if (IS_ERR(inode)) {
		r = PTR_ERR(inode);
		goto out1;
	}

	kvm = kvm_create_vm();
	if (IS_ERR(kvm)) {
		r = PTR_ERR(kvm);
		goto out2;
	}

	file = kvmfs_file(inode, kvm);
	if (IS_ERR(file)) {
		r = PTR_ERR(file);
		goto out3;
	}
A
Avi Kivity 已提交
2750
	kvm->filp = file;
2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769 2770 2771 2772 2773

	r = get_unused_fd();
	if (r < 0)
		goto out4;
	fd = r;
	fd_install(fd, file);

	return fd;

out4:
	fput(file);
out3:
	kvm_destroy_vm(kvm);
out2:
	iput(inode);
out1:
	return r;
}

static long kvm_dev_ioctl(struct file *filp,
			  unsigned int ioctl, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
2774
	long r = -EINVAL;
2775 2776 2777

	switch (ioctl) {
	case KVM_GET_API_VERSION:
2778 2779 2780
		r = -EINVAL;
		if (arg)
			goto out;
2781 2782 2783
		r = KVM_API_VERSION;
		break;
	case KVM_CREATE_VM:
2784 2785 2786
		r = -EINVAL;
		if (arg)
			goto out;
2787 2788
		r = kvm_dev_ioctl_create_vm();
		break;
A
Avi Kivity 已提交
2789
	case KVM_GET_MSR_INDEX_LIST: {
A
Al Viro 已提交
2790
		struct kvm_msr_list __user *user_msr_list = argp;
A
Avi Kivity 已提交
2791 2792 2793 2794 2795 2796 2797
		struct kvm_msr_list msr_list;
		unsigned n;

		r = -EFAULT;
		if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
			goto out;
		n = msr_list.nmsrs;
2798
		msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
A
Avi Kivity 已提交
2799 2800 2801
		if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
			goto out;
		r = -E2BIG;
2802
		if (n < num_msrs_to_save)
A
Avi Kivity 已提交
2803 2804 2805
			goto out;
		r = -EFAULT;
		if (copy_to_user(user_msr_list->indices, &msrs_to_save,
2806
				 num_msrs_to_save * sizeof(u32)))
A
Avi Kivity 已提交
2807
			goto out;
2808 2809 2810 2811 2812
		if (copy_to_user(user_msr_list->indices
				 + num_msrs_to_save * sizeof(u32),
				 &emulated_msrs,
				 ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
			goto out;
A
Avi Kivity 已提交
2813
		r = 0;
A
Avi Kivity 已提交
2814
		break;
A
Avi Kivity 已提交
2815
	}
2816 2817 2818 2819 2820 2821
	case KVM_CHECK_EXTENSION:
		/*
		 * No extensions defined at present.
		 */
		r = 0;
		break;
2822 2823 2824 2825
	case KVM_GET_VCPU_MMAP_SIZE:
		r = -EINVAL;
		if (arg)
			goto out;
2826
		r = 2 * PAGE_SIZE;
2827
		break;
A
Avi Kivity 已提交
2828 2829 2830 2831 2832 2833 2834 2835 2836 2837 2838 2839 2840 2841 2842
	default:
		;
	}
out:
	return r;
}

static struct file_operations kvm_chardev_ops = {
	.open		= kvm_dev_open,
	.release        = kvm_dev_release,
	.unlocked_ioctl = kvm_dev_ioctl,
	.compat_ioctl   = kvm_dev_ioctl,
};

static struct miscdevice kvm_dev = {
A
Avi Kivity 已提交
2843
	KVM_MINOR,
A
Avi Kivity 已提交
2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856
	"kvm",
	&kvm_chardev_ops,
};

static int kvm_reboot(struct notifier_block *notifier, unsigned long val,
                       void *v)
{
	if (val == SYS_RESTART) {
		/*
		 * Some (well, at least mine) BIOSes hang on reboot if
		 * in vmx root mode.
		 */
		printk(KERN_INFO "kvm: exiting hardware virtualization\n");
A
Al Viro 已提交
2857
		on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
A
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2858 2859 2860 2861 2862 2863 2864 2865 2866
	}
	return NOTIFY_OK;
}

static struct notifier_block kvm_reboot_notifier = {
	.notifier_call = kvm_reboot,
	.priority = 0,
};

A
Avi Kivity 已提交
2867 2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896 2897 2898 2899 2900 2901 2902 2903 2904 2905
/*
 * Make sure that a cpu that is being hot-unplugged does not have any vcpus
 * cached on it.
 */
static void decache_vcpus_on_cpu(int cpu)
{
	struct kvm *vm;
	struct kvm_vcpu *vcpu;
	int i;

	spin_lock(&kvm_lock);
	list_for_each_entry(vm, &vm_list, vm_list)
		for (i = 0; i < KVM_MAX_VCPUS; ++i) {
			vcpu = &vm->vcpus[i];
			/*
			 * If the vcpu is locked, then it is running on some
			 * other cpu and therefore it is not cached on the
			 * cpu in question.
			 *
			 * If it's not locked, check the last cpu it executed
			 * on.
			 */
			if (mutex_trylock(&vcpu->mutex)) {
				if (vcpu->cpu == cpu) {
					kvm_arch_ops->vcpu_decache(vcpu);
					vcpu->cpu = -1;
				}
				mutex_unlock(&vcpu->mutex);
			}
		}
	spin_unlock(&kvm_lock);
}

static int kvm_cpu_hotplug(struct notifier_block *notifier, unsigned long val,
			   void *v)
{
	int cpu = (long)v;

	switch (val) {
2906
	case CPU_DOWN_PREPARE:
A
Avi Kivity 已提交
2907
	case CPU_UP_CANCELED:
2908 2909
		printk(KERN_INFO "kvm: disabling virtualization on CPU%d\n",
		       cpu);
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Avi Kivity 已提交
2910 2911 2912 2913
		decache_vcpus_on_cpu(cpu);
		smp_call_function_single(cpu, kvm_arch_ops->hardware_disable,
					 NULL, 0, 1);
		break;
2914 2915 2916
	case CPU_ONLINE:
		printk(KERN_INFO "kvm: enabling virtualization on CPU%d\n",
		       cpu);
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Avi Kivity 已提交
2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928
		smp_call_function_single(cpu, kvm_arch_ops->hardware_enable,
					 NULL, 0, 1);
		break;
	}
	return NOTIFY_OK;
}

static struct notifier_block kvm_cpu_notifier = {
	.notifier_call = kvm_cpu_hotplug,
	.priority = 20, /* must be > scheduler priority */
};

A
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2929 2930 2931 2932
static __init void kvm_init_debug(void)
{
	struct kvm_stats_debugfs_item *p;

A
Al Viro 已提交
2933
	debugfs_dir = debugfs_create_dir("kvm", NULL);
A
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2934 2935 2936 2937 2938 2939 2940 2941 2942 2943 2944 2945 2946 2947
	for (p = debugfs_entries; p->name; ++p)
		p->dentry = debugfs_create_u32(p->name, 0444, debugfs_dir,
					       p->data);
}

static void kvm_exit_debug(void)
{
	struct kvm_stats_debugfs_item *p;

	for (p = debugfs_entries; p->name; ++p)
		debugfs_remove(p->dentry);
	debugfs_remove(debugfs_dir);
}

2948 2949 2950
static int kvm_suspend(struct sys_device *dev, pm_message_t state)
{
	decache_vcpus_on_cpu(raw_smp_processor_id());
A
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2951
	on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
2952 2953 2954 2955 2956
	return 0;
}

static int kvm_resume(struct sys_device *dev)
{
A
Avi Kivity 已提交
2957
	on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
2958 2959 2960 2961 2962 2963 2964 2965 2966 2967 2968 2969 2970 2971
	return 0;
}

static struct sysdev_class kvm_sysdev_class = {
	set_kset_name("kvm"),
	.suspend = kvm_suspend,
	.resume = kvm_resume,
};

static struct sys_device kvm_sysdev = {
	.id = 0,
	.cls = &kvm_sysdev_class,
};

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2972 2973
hpa_t bad_page_address;

2974 2975 2976
static int kvmfs_get_sb(struct file_system_type *fs_type, int flags,
			const char *dev_name, void *data, struct vfsmount *mnt)
{
2977
	return get_sb_pseudo(fs_type, "kvm:", NULL, KVMFS_SUPER_MAGIC, mnt);
2978 2979 2980 2981 2982 2983 2984 2985
}

static struct file_system_type kvm_fs_type = {
	.name		= "kvmfs",
	.get_sb		= kvmfs_get_sb,
	.kill_sb	= kill_anon_super,
};

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2986 2987 2988 2989
int kvm_init_arch(struct kvm_arch_ops *ops, struct module *module)
{
	int r;

2990 2991 2992 2993 2994
	if (kvm_arch_ops) {
		printk(KERN_ERR "kvm: already loaded the other module\n");
		return -EEXIST;
	}

2995
	if (!ops->cpu_has_kvm_support()) {
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2996 2997 2998
		printk(KERN_ERR "kvm: no hardware support\n");
		return -EOPNOTSUPP;
	}
2999
	if (ops->disabled_by_bios()) {
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3000 3001 3002 3003
		printk(KERN_ERR "kvm: disabled by bios\n");
		return -EOPNOTSUPP;
	}

3004 3005
	kvm_arch_ops = ops;

A
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3006 3007
	r = kvm_arch_ops->hardware_setup();
	if (r < 0)
3008
		goto out;
A
Avi Kivity 已提交
3009

A
Al Viro 已提交
3010
	on_each_cpu(kvm_arch_ops->hardware_enable, NULL, 0, 1);
A
Avi Kivity 已提交
3011 3012 3013
	r = register_cpu_notifier(&kvm_cpu_notifier);
	if (r)
		goto out_free_1;
A
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3014 3015
	register_reboot_notifier(&kvm_reboot_notifier);

3016 3017 3018 3019 3020 3021 3022 3023
	r = sysdev_class_register(&kvm_sysdev_class);
	if (r)
		goto out_free_2;

	r = sysdev_register(&kvm_sysdev);
	if (r)
		goto out_free_3;

A
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3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034
	kvm_chardev_ops.owner = module;

	r = misc_register(&kvm_dev);
	if (r) {
		printk (KERN_ERR "kvm: misc device register failed\n");
		goto out_free;
	}

	return r;

out_free:
3035 3036 3037 3038
	sysdev_unregister(&kvm_sysdev);
out_free_3:
	sysdev_class_unregister(&kvm_sysdev_class);
out_free_2:
A
Avi Kivity 已提交
3039
	unregister_reboot_notifier(&kvm_reboot_notifier);
A
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3040 3041
	unregister_cpu_notifier(&kvm_cpu_notifier);
out_free_1:
A
Al Viro 已提交
3042
	on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
A
Avi Kivity 已提交
3043
	kvm_arch_ops->hardware_unsetup();
3044 3045
out:
	kvm_arch_ops = NULL;
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3046 3047 3048 3049 3050 3051
	return r;
}

void kvm_exit_arch(void)
{
	misc_deregister(&kvm_dev);
3052 3053
	sysdev_unregister(&kvm_sysdev);
	sysdev_class_unregister(&kvm_sysdev_class);
A
Avi Kivity 已提交
3054
	unregister_reboot_notifier(&kvm_reboot_notifier);
3055
	unregister_cpu_notifier(&kvm_cpu_notifier);
A
Al Viro 已提交
3056
	on_each_cpu(kvm_arch_ops->hardware_disable, NULL, 0, 1);
A
Avi Kivity 已提交
3057
	kvm_arch_ops->hardware_unsetup();
3058
	kvm_arch_ops = NULL;
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3059 3060 3061 3062 3063
}

static __init int kvm_init(void)
{
	static struct page *bad_page;
3064 3065
	int r;

3066 3067 3068 3069
	r = kvm_mmu_module_init();
	if (r)
		goto out4;

3070 3071 3072
	r = register_filesystem(&kvm_fs_type);
	if (r)
		goto out3;
A
Avi Kivity 已提交
3073

3074 3075 3076 3077
	kvmfs_mnt = kern_mount(&kvm_fs_type);
	r = PTR_ERR(kvmfs_mnt);
	if (IS_ERR(kvmfs_mnt))
		goto out2;
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3078 3079
	kvm_init_debug();

3080 3081
	kvm_init_msr_list();

A
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3082 3083 3084 3085 3086 3087 3088 3089
	if ((bad_page = alloc_page(GFP_KERNEL)) == NULL) {
		r = -ENOMEM;
		goto out;
	}

	bad_page_address = page_to_pfn(bad_page) << PAGE_SHIFT;
	memset(__va(bad_page_address), 0, PAGE_SIZE);

3090
	return 0;
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Avi Kivity 已提交
3091 3092 3093

out:
	kvm_exit_debug();
3094 3095 3096 3097
	mntput(kvmfs_mnt);
out2:
	unregister_filesystem(&kvm_fs_type);
out3:
3098 3099
	kvm_mmu_module_exit();
out4:
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3100 3101 3102 3103 3104 3105 3106
	return r;
}

static __exit void kvm_exit(void)
{
	kvm_exit_debug();
	__free_page(pfn_to_page(bad_page_address >> PAGE_SHIFT));
3107 3108
	mntput(kvmfs_mnt);
	unregister_filesystem(&kvm_fs_type);
3109
	kvm_mmu_module_exit();
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3110 3111 3112 3113 3114 3115 3116
}

module_init(kvm_init)
module_exit(kvm_exit)

EXPORT_SYMBOL_GPL(kvm_init_arch);
EXPORT_SYMBOL_GPL(kvm_exit_arch);