book3s_hv.c 69.5 KB
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/*
 * Copyright 2011 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
 * Copyright (C) 2009. SUSE Linux Products GmbH. All rights reserved.
 *
 * Authors:
 *    Paul Mackerras <paulus@au1.ibm.com>
 *    Alexander Graf <agraf@suse.de>
 *    Kevin Wolf <mail@kevin-wolf.de>
 *
 * Description: KVM functions specific to running on Book 3S
 * processors in hypervisor mode (specifically POWER7 and later).
 *
 * This file is derived from arch/powerpc/kvm/book3s.c,
 * by Alexander Graf <agraf@suse.de>.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 */

#include <linux/kvm_host.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/preempt.h>
#include <linux/sched.h>
#include <linux/delay.h>
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#include <linux/export.h>
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#include <linux/fs.h>
#include <linux/anon_inodes.h>
#include <linux/cpumask.h>
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#include <linux/spinlock.h>
#include <linux/page-flags.h>
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#include <linux/srcu.h>
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#include <linux/miscdevice.h>
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#include <linux/debugfs.h>
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#include <asm/reg.h>
#include <asm/cputable.h>
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#include <asm/cache.h>
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#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/kvm_ppc.h>
#include <asm/kvm_book3s.h>
#include <asm/mmu_context.h>
#include <asm/lppaca.h>
#include <asm/processor.h>
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#include <asm/cputhreads.h>
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#include <asm/page.h>
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#include <asm/hvcall.h>
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#include <asm/switch_to.h>
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#include <asm/smp.h>
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#include <asm/dbell.h>
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#include <linux/gfp.h>
#include <linux/vmalloc.h>
#include <linux/highmem.h>
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#include <linux/hugetlb.h>
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#include <linux/module.h>
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#include "book3s.h"

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#define CREATE_TRACE_POINTS
#include "trace_hv.h"

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/* #define EXIT_DEBUG */
/* #define EXIT_DEBUG_SIMPLE */
/* #define EXIT_DEBUG_INT */

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/* Used to indicate that a guest page fault needs to be handled */
#define RESUME_PAGE_FAULT	(RESUME_GUEST | RESUME_FLAG_ARCH1)

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/* Used as a "null" value for timebase values */
#define TB_NIL	(~(u64)0)

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static DECLARE_BITMAP(default_enabled_hcalls, MAX_HCALL_OPCODE/4 + 1);

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#if defined(CONFIG_PPC_64K_PAGES)
#define MPP_BUFFER_ORDER	0
#elif defined(CONFIG_PPC_4K_PAGES)
#define MPP_BUFFER_ORDER	3
#endif


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static void kvmppc_end_cede(struct kvm_vcpu *vcpu);
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static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu);
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static bool kvmppc_ipi_thread(int cpu)
{
	/* On POWER8 for IPIs to threads in the same core, use msgsnd */
	if (cpu_has_feature(CPU_FTR_ARCH_207S)) {
		preempt_disable();
		if (cpu_first_thread_sibling(cpu) ==
		    cpu_first_thread_sibling(smp_processor_id())) {
			unsigned long msg = PPC_DBELL_TYPE(PPC_DBELL_SERVER);
			msg |= cpu_thread_in_core(cpu);
			smp_mb();
			__asm__ __volatile__ (PPC_MSGSND(%0) : : "r" (msg));
			preempt_enable();
			return true;
		}
		preempt_enable();
	}

#if defined(CONFIG_PPC_ICP_NATIVE) && defined(CONFIG_SMP)
	if (cpu >= 0 && cpu < nr_cpu_ids && paca[cpu].kvm_hstate.xics_phys) {
		xics_wake_cpu(cpu);
		return true;
	}
#endif

	return false;
}

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static void kvmppc_fast_vcpu_kick_hv(struct kvm_vcpu *vcpu)
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{
	int cpu = vcpu->cpu;
	wait_queue_head_t *wqp;

	wqp = kvm_arch_vcpu_wq(vcpu);
	if (waitqueue_active(wqp)) {
		wake_up_interruptible(wqp);
		++vcpu->stat.halt_wakeup;
	}

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	if (kvmppc_ipi_thread(cpu + vcpu->arch.ptid))
		return;
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	/* CPU points to the first thread of the core */
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	if (cpu >= 0 && cpu < nr_cpu_ids && cpu_online(cpu))
		smp_send_reschedule(cpu);
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}

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/*
 * We use the vcpu_load/put functions to measure stolen time.
 * Stolen time is counted as time when either the vcpu is able to
 * run as part of a virtual core, but the task running the vcore
 * is preempted or sleeping, or when the vcpu needs something done
 * in the kernel by the task running the vcpu, but that task is
 * preempted or sleeping.  Those two things have to be counted
 * separately, since one of the vcpu tasks will take on the job
 * of running the core, and the other vcpu tasks in the vcore will
 * sleep waiting for it to do that, but that sleep shouldn't count
 * as stolen time.
 *
 * Hence we accumulate stolen time when the vcpu can run as part of
 * a vcore using vc->stolen_tb, and the stolen time when the vcpu
 * needs its task to do other things in the kernel (for example,
 * service a page fault) in busy_stolen.  We don't accumulate
 * stolen time for a vcore when it is inactive, or for a vcpu
 * when it is in state RUNNING or NOTREADY.  NOTREADY is a bit of
 * a misnomer; it means that the vcpu task is not executing in
 * the KVM_VCPU_RUN ioctl, i.e. it is in userspace or elsewhere in
 * the kernel.  We don't have any way of dividing up that time
 * between time that the vcpu is genuinely stopped, time that
 * the task is actively working on behalf of the vcpu, and time
 * that the task is preempted, so we don't count any of it as
 * stolen.
 *
 * Updates to busy_stolen are protected by arch.tbacct_lock;
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 * updates to vc->stolen_tb are protected by the vcore->stoltb_lock
 * lock.  The stolen times are measured in units of timebase ticks.
 * (Note that the != TB_NIL checks below are purely defensive;
 * they should never fail.)
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 */

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static void kvmppc_core_vcpu_load_hv(struct kvm_vcpu *vcpu, int cpu)
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{
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	struct kvmppc_vcore *vc = vcpu->arch.vcore;
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	unsigned long flags;
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	/*
	 * We can test vc->runner without taking the vcore lock,
	 * because only this task ever sets vc->runner to this
	 * vcpu, and once it is set to this vcpu, only this task
	 * ever sets it to NULL.
	 */
	if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE) {
		spin_lock_irqsave(&vc->stoltb_lock, flags);
		if (vc->preempt_tb != TB_NIL) {
			vc->stolen_tb += mftb() - vc->preempt_tb;
			vc->preempt_tb = TB_NIL;
		}
		spin_unlock_irqrestore(&vc->stoltb_lock, flags);
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	}
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	spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
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	if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST &&
	    vcpu->arch.busy_preempt != TB_NIL) {
		vcpu->arch.busy_stolen += mftb() - vcpu->arch.busy_preempt;
		vcpu->arch.busy_preempt = TB_NIL;
	}
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	spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
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}

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static void kvmppc_core_vcpu_put_hv(struct kvm_vcpu *vcpu)
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{
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	struct kvmppc_vcore *vc = vcpu->arch.vcore;
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	unsigned long flags;
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	if (vc->runner == vcpu && vc->vcore_state != VCORE_INACTIVE) {
		spin_lock_irqsave(&vc->stoltb_lock, flags);
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		vc->preempt_tb = mftb();
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		spin_unlock_irqrestore(&vc->stoltb_lock, flags);
	}
	spin_lock_irqsave(&vcpu->arch.tbacct_lock, flags);
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	if (vcpu->arch.state == KVMPPC_VCPU_BUSY_IN_HOST)
		vcpu->arch.busy_preempt = mftb();
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	spin_unlock_irqrestore(&vcpu->arch.tbacct_lock, flags);
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}

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static void kvmppc_set_msr_hv(struct kvm_vcpu *vcpu, u64 msr)
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{
	vcpu->arch.shregs.msr = msr;
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	kvmppc_end_cede(vcpu);
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}

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void kvmppc_set_pvr_hv(struct kvm_vcpu *vcpu, u32 pvr)
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{
	vcpu->arch.pvr = pvr;
}

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int kvmppc_set_arch_compat(struct kvm_vcpu *vcpu, u32 arch_compat)
{
	unsigned long pcr = 0;
	struct kvmppc_vcore *vc = vcpu->arch.vcore;

	if (arch_compat) {
		switch (arch_compat) {
		case PVR_ARCH_205:
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			/*
			 * If an arch bit is set in PCR, all the defined
			 * higher-order arch bits also have to be set.
			 */
			pcr = PCR_ARCH_206 | PCR_ARCH_205;
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			break;
		case PVR_ARCH_206:
		case PVR_ARCH_206p:
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			pcr = PCR_ARCH_206;
			break;
		case PVR_ARCH_207:
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			break;
		default:
			return -EINVAL;
		}
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		if (!cpu_has_feature(CPU_FTR_ARCH_207S)) {
			/* POWER7 can't emulate POWER8 */
			if (!(pcr & PCR_ARCH_206))
				return -EINVAL;
			pcr &= ~PCR_ARCH_206;
		}
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	}

	spin_lock(&vc->lock);
	vc->arch_compat = arch_compat;
	vc->pcr = pcr;
	spin_unlock(&vc->lock);

	return 0;
}

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void kvmppc_dump_regs(struct kvm_vcpu *vcpu)
{
	int r;

	pr_err("vcpu %p (%d):\n", vcpu, vcpu->vcpu_id);
	pr_err("pc  = %.16lx  msr = %.16llx  trap = %x\n",
	       vcpu->arch.pc, vcpu->arch.shregs.msr, vcpu->arch.trap);
	for (r = 0; r < 16; ++r)
		pr_err("r%2d = %.16lx  r%d = %.16lx\n",
		       r, kvmppc_get_gpr(vcpu, r),
		       r+16, kvmppc_get_gpr(vcpu, r+16));
	pr_err("ctr = %.16lx  lr  = %.16lx\n",
	       vcpu->arch.ctr, vcpu->arch.lr);
	pr_err("srr0 = %.16llx srr1 = %.16llx\n",
	       vcpu->arch.shregs.srr0, vcpu->arch.shregs.srr1);
	pr_err("sprg0 = %.16llx sprg1 = %.16llx\n",
	       vcpu->arch.shregs.sprg0, vcpu->arch.shregs.sprg1);
	pr_err("sprg2 = %.16llx sprg3 = %.16llx\n",
	       vcpu->arch.shregs.sprg2, vcpu->arch.shregs.sprg3);
	pr_err("cr = %.8x  xer = %.16lx  dsisr = %.8x\n",
	       vcpu->arch.cr, vcpu->arch.xer, vcpu->arch.shregs.dsisr);
	pr_err("dar = %.16llx\n", vcpu->arch.shregs.dar);
	pr_err("fault dar = %.16lx dsisr = %.8x\n",
	       vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
	pr_err("SLB (%d entries):\n", vcpu->arch.slb_max);
	for (r = 0; r < vcpu->arch.slb_max; ++r)
		pr_err("  ESID = %.16llx VSID = %.16llx\n",
		       vcpu->arch.slb[r].orige, vcpu->arch.slb[r].origv);
	pr_err("lpcr = %.16lx sdr1 = %.16lx last_inst = %.8x\n",
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	       vcpu->arch.vcore->lpcr, vcpu->kvm->arch.sdr1,
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	       vcpu->arch.last_inst);
}

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struct kvm_vcpu *kvmppc_find_vcpu(struct kvm *kvm, int id)
{
	int r;
	struct kvm_vcpu *v, *ret = NULL;

	mutex_lock(&kvm->lock);
	kvm_for_each_vcpu(r, v, kvm) {
		if (v->vcpu_id == id) {
			ret = v;
			break;
		}
	}
	mutex_unlock(&kvm->lock);
	return ret;
}

static void init_vpa(struct kvm_vcpu *vcpu, struct lppaca *vpa)
{
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	vpa->__old_status |= LPPACA_OLD_SHARED_PROC;
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	vpa->yield_count = cpu_to_be32(1);
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}

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static int set_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *v,
		   unsigned long addr, unsigned long len)
{
	/* check address is cacheline aligned */
	if (addr & (L1_CACHE_BYTES - 1))
		return -EINVAL;
	spin_lock(&vcpu->arch.vpa_update_lock);
	if (v->next_gpa != addr || v->len != len) {
		v->next_gpa = addr;
		v->len = addr ? len : 0;
		v->update_pending = 1;
	}
	spin_unlock(&vcpu->arch.vpa_update_lock);
	return 0;
}

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/* Length for a per-processor buffer is passed in at offset 4 in the buffer */
struct reg_vpa {
	u32 dummy;
	union {
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		__be16 hword;
		__be32 word;
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	} length;
};

static int vpa_is_registered(struct kvmppc_vpa *vpap)
{
	if (vpap->update_pending)
		return vpap->next_gpa != 0;
	return vpap->pinned_addr != NULL;
}

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static unsigned long do_h_register_vpa(struct kvm_vcpu *vcpu,
				       unsigned long flags,
				       unsigned long vcpuid, unsigned long vpa)
{
	struct kvm *kvm = vcpu->kvm;
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	unsigned long len, nb;
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	void *va;
	struct kvm_vcpu *tvcpu;
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	int err;
	int subfunc;
	struct kvmppc_vpa *vpap;
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	tvcpu = kvmppc_find_vcpu(kvm, vcpuid);
	if (!tvcpu)
		return H_PARAMETER;

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	subfunc = (flags >> H_VPA_FUNC_SHIFT) & H_VPA_FUNC_MASK;
	if (subfunc == H_VPA_REG_VPA || subfunc == H_VPA_REG_DTL ||
	    subfunc == H_VPA_REG_SLB) {
		/* Registering new area - address must be cache-line aligned */
		if ((vpa & (L1_CACHE_BYTES - 1)) || !vpa)
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			return H_PARAMETER;
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		/* convert logical addr to kernel addr and read length */
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		va = kvmppc_pin_guest_page(kvm, vpa, &nb);
		if (va == NULL)
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			return H_PARAMETER;
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		if (subfunc == H_VPA_REG_VPA)
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			len = be16_to_cpu(((struct reg_vpa *)va)->length.hword);
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		else
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			len = be32_to_cpu(((struct reg_vpa *)va)->length.word);
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		kvmppc_unpin_guest_page(kvm, va, vpa, false);
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		/* Check length */
		if (len > nb || len < sizeof(struct reg_vpa))
			return H_PARAMETER;
	} else {
		vpa = 0;
		len = 0;
	}

	err = H_PARAMETER;
	vpap = NULL;
	spin_lock(&tvcpu->arch.vpa_update_lock);

	switch (subfunc) {
	case H_VPA_REG_VPA:		/* register VPA */
		if (len < sizeof(struct lppaca))
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			break;
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		vpap = &tvcpu->arch.vpa;
		err = 0;
		break;

	case H_VPA_REG_DTL:		/* register DTL */
		if (len < sizeof(struct dtl_entry))
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			break;
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		len -= len % sizeof(struct dtl_entry);

		/* Check that they have previously registered a VPA */
		err = H_RESOURCE;
		if (!vpa_is_registered(&tvcpu->arch.vpa))
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			break;
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		vpap = &tvcpu->arch.dtl;
		err = 0;
		break;

	case H_VPA_REG_SLB:		/* register SLB shadow buffer */
		/* Check that they have previously registered a VPA */
		err = H_RESOURCE;
		if (!vpa_is_registered(&tvcpu->arch.vpa))
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			break;
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		vpap = &tvcpu->arch.slb_shadow;
		err = 0;
		break;

	case H_VPA_DEREG_VPA:		/* deregister VPA */
		/* Check they don't still have a DTL or SLB buf registered */
		err = H_RESOURCE;
		if (vpa_is_registered(&tvcpu->arch.dtl) ||
		    vpa_is_registered(&tvcpu->arch.slb_shadow))
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			break;
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		vpap = &tvcpu->arch.vpa;
		err = 0;
		break;

	case H_VPA_DEREG_DTL:		/* deregister DTL */
		vpap = &tvcpu->arch.dtl;
		err = 0;
		break;

	case H_VPA_DEREG_SLB:		/* deregister SLB shadow buffer */
		vpap = &tvcpu->arch.slb_shadow;
		err = 0;
		break;
	}

	if (vpap) {
		vpap->next_gpa = vpa;
		vpap->len = len;
		vpap->update_pending = 1;
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	}
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	spin_unlock(&tvcpu->arch.vpa_update_lock);

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	return err;
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}

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static void kvmppc_update_vpa(struct kvm_vcpu *vcpu, struct kvmppc_vpa *vpap)
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{
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	struct kvm *kvm = vcpu->kvm;
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	void *va;
	unsigned long nb;
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	unsigned long gpa;
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	/*
	 * We need to pin the page pointed to by vpap->next_gpa,
	 * but we can't call kvmppc_pin_guest_page under the lock
	 * as it does get_user_pages() and down_read().  So we
	 * have to drop the lock, pin the page, then get the lock
	 * again and check that a new area didn't get registered
	 * in the meantime.
	 */
	for (;;) {
		gpa = vpap->next_gpa;
		spin_unlock(&vcpu->arch.vpa_update_lock);
		va = NULL;
		nb = 0;
		if (gpa)
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			va = kvmppc_pin_guest_page(kvm, gpa, &nb);
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		spin_lock(&vcpu->arch.vpa_update_lock);
		if (gpa == vpap->next_gpa)
			break;
		/* sigh... unpin that one and try again */
		if (va)
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			kvmppc_unpin_guest_page(kvm, va, gpa, false);
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	}

	vpap->update_pending = 0;
	if (va && nb < vpap->len) {
		/*
		 * If it's now too short, it must be that userspace
		 * has changed the mappings underlying guest memory,
		 * so unregister the region.
		 */
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		kvmppc_unpin_guest_page(kvm, va, gpa, false);
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		va = NULL;
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	}
	if (vpap->pinned_addr)
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		kvmppc_unpin_guest_page(kvm, vpap->pinned_addr, vpap->gpa,
					vpap->dirty);
	vpap->gpa = gpa;
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	vpap->pinned_addr = va;
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	vpap->dirty = false;
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	if (va)
		vpap->pinned_end = va + vpap->len;
}

static void kvmppc_update_vpas(struct kvm_vcpu *vcpu)
{
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	if (!(vcpu->arch.vpa.update_pending ||
	      vcpu->arch.slb_shadow.update_pending ||
	      vcpu->arch.dtl.update_pending))
		return;

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	spin_lock(&vcpu->arch.vpa_update_lock);
	if (vcpu->arch.vpa.update_pending) {
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		kvmppc_update_vpa(vcpu, &vcpu->arch.vpa);
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		if (vcpu->arch.vpa.pinned_addr)
			init_vpa(vcpu, vcpu->arch.vpa.pinned_addr);
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	}
	if (vcpu->arch.dtl.update_pending) {
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		kvmppc_update_vpa(vcpu, &vcpu->arch.dtl);
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		vcpu->arch.dtl_ptr = vcpu->arch.dtl.pinned_addr;
		vcpu->arch.dtl_index = 0;
	}
	if (vcpu->arch.slb_shadow.update_pending)
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		kvmppc_update_vpa(vcpu, &vcpu->arch.slb_shadow);
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	spin_unlock(&vcpu->arch.vpa_update_lock);
}

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/*
 * Return the accumulated stolen time for the vcore up until `now'.
 * The caller should hold the vcore lock.
 */
static u64 vcore_stolen_time(struct kvmppc_vcore *vc, u64 now)
{
	u64 p;
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	unsigned long flags;
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	spin_lock_irqsave(&vc->stoltb_lock, flags);
	p = vc->stolen_tb;
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	if (vc->vcore_state != VCORE_INACTIVE &&
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	    vc->preempt_tb != TB_NIL)
		p += now - vc->preempt_tb;
	spin_unlock_irqrestore(&vc->stoltb_lock, flags);
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	return p;
}

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static void kvmppc_create_dtl_entry(struct kvm_vcpu *vcpu,
				    struct kvmppc_vcore *vc)
{
	struct dtl_entry *dt;
	struct lppaca *vpa;
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	unsigned long stolen;
	unsigned long core_stolen;
	u64 now;
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	dt = vcpu->arch.dtl_ptr;
	vpa = vcpu->arch.vpa.pinned_addr;
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	now = mftb();
	core_stolen = vcore_stolen_time(vc, now);
	stolen = core_stolen - vcpu->arch.stolen_logged;
	vcpu->arch.stolen_logged = core_stolen;
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	spin_lock_irq(&vcpu->arch.tbacct_lock);
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	stolen += vcpu->arch.busy_stolen;
	vcpu->arch.busy_stolen = 0;
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	spin_unlock_irq(&vcpu->arch.tbacct_lock);
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	if (!dt || !vpa)
		return;
	memset(dt, 0, sizeof(struct dtl_entry));
	dt->dispatch_reason = 7;
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	dt->processor_id = cpu_to_be16(vc->pcpu + vcpu->arch.ptid);
	dt->timebase = cpu_to_be64(now + vc->tb_offset);
	dt->enqueue_to_dispatch_time = cpu_to_be32(stolen);
	dt->srr0 = cpu_to_be64(kvmppc_get_pc(vcpu));
	dt->srr1 = cpu_to_be64(vcpu->arch.shregs.msr);
578 579 580 581 582 583
	++dt;
	if (dt == vcpu->arch.dtl.pinned_end)
		dt = vcpu->arch.dtl.pinned_addr;
	vcpu->arch.dtl_ptr = dt;
	/* order writing *dt vs. writing vpa->dtl_idx */
	smp_wmb();
584
	vpa->dtl_idx = cpu_to_be64(++vcpu->arch.dtl_index);
585
	vcpu->arch.dtl.dirty = true;
586 587
}

588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629
static bool kvmppc_power8_compatible(struct kvm_vcpu *vcpu)
{
	if (vcpu->arch.vcore->arch_compat >= PVR_ARCH_207)
		return true;
	if ((!vcpu->arch.vcore->arch_compat) &&
	    cpu_has_feature(CPU_FTR_ARCH_207S))
		return true;
	return false;
}

static int kvmppc_h_set_mode(struct kvm_vcpu *vcpu, unsigned long mflags,
			     unsigned long resource, unsigned long value1,
			     unsigned long value2)
{
	switch (resource) {
	case H_SET_MODE_RESOURCE_SET_CIABR:
		if (!kvmppc_power8_compatible(vcpu))
			return H_P2;
		if (value2)
			return H_P4;
		if (mflags)
			return H_UNSUPPORTED_FLAG_START;
		/* Guests can't breakpoint the hypervisor */
		if ((value1 & CIABR_PRIV) == CIABR_PRIV_HYPER)
			return H_P3;
		vcpu->arch.ciabr  = value1;
		return H_SUCCESS;
	case H_SET_MODE_RESOURCE_SET_DAWR:
		if (!kvmppc_power8_compatible(vcpu))
			return H_P2;
		if (mflags)
			return H_UNSUPPORTED_FLAG_START;
		if (value2 & DABRX_HYP)
			return H_P4;
		vcpu->arch.dawr  = value1;
		vcpu->arch.dawrx = value2;
		return H_SUCCESS;
	default:
		return H_TOO_HARD;
	}
}

630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658
static int kvm_arch_vcpu_yield_to(struct kvm_vcpu *target)
{
	struct kvmppc_vcore *vcore = target->arch.vcore;

	/*
	 * We expect to have been called by the real mode handler
	 * (kvmppc_rm_h_confer()) which would have directly returned
	 * H_SUCCESS if the source vcore wasn't idle (e.g. if it may
	 * have useful work to do and should not confer) so we don't
	 * recheck that here.
	 */

	spin_lock(&vcore->lock);
	if (target->arch.state == KVMPPC_VCPU_RUNNABLE &&
	    vcore->vcore_state != VCORE_INACTIVE)
		target = vcore->runner;
	spin_unlock(&vcore->lock);

	return kvm_vcpu_yield_to(target);
}

static int kvmppc_get_yield_count(struct kvm_vcpu *vcpu)
{
	int yield_count = 0;
	struct lppaca *lppaca;

	spin_lock(&vcpu->arch.vpa_update_lock);
	lppaca = (struct lppaca *)vcpu->arch.vpa.pinned_addr;
	if (lppaca)
659
		yield_count = be32_to_cpu(lppaca->yield_count);
660 661 662 663
	spin_unlock(&vcpu->arch.vpa_update_lock);
	return yield_count;
}

664 665 666 667
int kvmppc_pseries_do_hcall(struct kvm_vcpu *vcpu)
{
	unsigned long req = kvmppc_get_gpr(vcpu, 3);
	unsigned long target, ret = H_SUCCESS;
668
	int yield_count;
669
	struct kvm_vcpu *tvcpu;
670
	int idx, rc;
671

672 673 674 675
	if (req <= MAX_HCALL_OPCODE &&
	    !test_bit(req/4, vcpu->kvm->arch.enabled_hcalls))
		return RESUME_HOST;

676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695
	switch (req) {
	case H_CEDE:
		break;
	case H_PROD:
		target = kvmppc_get_gpr(vcpu, 4);
		tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
		if (!tvcpu) {
			ret = H_PARAMETER;
			break;
		}
		tvcpu->arch.prodded = 1;
		smp_mb();
		if (vcpu->arch.ceded) {
			if (waitqueue_active(&vcpu->wq)) {
				wake_up_interruptible(&vcpu->wq);
				vcpu->stat.halt_wakeup++;
			}
		}
		break;
	case H_CONFER:
696 697 698 699 700 701 702 703
		target = kvmppc_get_gpr(vcpu, 4);
		if (target == -1)
			break;
		tvcpu = kvmppc_find_vcpu(vcpu->kvm, target);
		if (!tvcpu) {
			ret = H_PARAMETER;
			break;
		}
704 705 706 707
		yield_count = kvmppc_get_gpr(vcpu, 5);
		if (kvmppc_get_yield_count(tvcpu) != yield_count)
			break;
		kvm_arch_vcpu_yield_to(tvcpu);
708 709 710 711 712 713
		break;
	case H_REGISTER_VPA:
		ret = do_h_register_vpa(vcpu, kvmppc_get_gpr(vcpu, 4),
					kvmppc_get_gpr(vcpu, 5),
					kvmppc_get_gpr(vcpu, 6));
		break;
714 715 716 717
	case H_RTAS:
		if (list_empty(&vcpu->kvm->arch.rtas_tokens))
			return RESUME_HOST;

718
		idx = srcu_read_lock(&vcpu->kvm->srcu);
719
		rc = kvmppc_rtas_hcall(vcpu);
720
		srcu_read_unlock(&vcpu->kvm->srcu, idx);
721 722 723 724 725 726 727 728

		if (rc == -ENOENT)
			return RESUME_HOST;
		else if (rc == 0)
			break;

		/* Send the error out to userspace via KVM_RUN */
		return rc;
729 730 731 732 733 734 735 736 737 738
	case H_LOGICAL_CI_LOAD:
		ret = kvmppc_h_logical_ci_load(vcpu);
		if (ret == H_TOO_HARD)
			return RESUME_HOST;
		break;
	case H_LOGICAL_CI_STORE:
		ret = kvmppc_h_logical_ci_store(vcpu);
		if (ret == H_TOO_HARD)
			return RESUME_HOST;
		break;
739 740 741 742 743 744 745 746
	case H_SET_MODE:
		ret = kvmppc_h_set_mode(vcpu, kvmppc_get_gpr(vcpu, 4),
					kvmppc_get_gpr(vcpu, 5),
					kvmppc_get_gpr(vcpu, 6),
					kvmppc_get_gpr(vcpu, 7));
		if (ret == H_TOO_HARD)
			return RESUME_HOST;
		break;
747 748 749 750
	case H_XIRR:
	case H_CPPR:
	case H_EOI:
	case H_IPI:
751 752
	case H_IPOLL:
	case H_XIRR_X:
753 754 755 756
		if (kvmppc_xics_enabled(vcpu)) {
			ret = kvmppc_xics_hcall(vcpu, req);
			break;
		} /* fallthrough */
757 758 759 760 761 762 763 764
	default:
		return RESUME_HOST;
	}
	kvmppc_set_gpr(vcpu, 3, ret);
	vcpu->arch.hcall_needed = 0;
	return RESUME_GUEST;
}

765 766 767 768 769 770 771
static int kvmppc_hcall_impl_hv(unsigned long cmd)
{
	switch (cmd) {
	case H_CEDE:
	case H_PROD:
	case H_CONFER:
	case H_REGISTER_VPA:
772
	case H_SET_MODE:
773 774
	case H_LOGICAL_CI_LOAD:
	case H_LOGICAL_CI_STORE:
775 776 777 778 779 780 781 782 783 784 785 786 787 788 789
#ifdef CONFIG_KVM_XICS
	case H_XIRR:
	case H_CPPR:
	case H_EOI:
	case H_IPI:
	case H_IPOLL:
	case H_XIRR_X:
#endif
		return 1;
	}

	/* See if it's in the real-mode table */
	return kvmppc_hcall_impl_hv_realmode(cmd);
}

790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813
static int kvmppc_emulate_debug_inst(struct kvm_run *run,
					struct kvm_vcpu *vcpu)
{
	u32 last_inst;

	if (kvmppc_get_last_inst(vcpu, INST_GENERIC, &last_inst) !=
					EMULATE_DONE) {
		/*
		 * Fetch failed, so return to guest and
		 * try executing it again.
		 */
		return RESUME_GUEST;
	}

	if (last_inst == KVMPPC_INST_SW_BREAKPOINT) {
		run->exit_reason = KVM_EXIT_DEBUG;
		run->debug.arch.address = kvmppc_get_pc(vcpu);
		return RESUME_HOST;
	} else {
		kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
		return RESUME_GUEST;
	}
}

814 815
static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
				 struct task_struct *tsk)
816 817 818 819 820 821 822 823 824 825 826 827 828 829
{
	int r = RESUME_HOST;

	vcpu->stat.sum_exits++;

	run->exit_reason = KVM_EXIT_UNKNOWN;
	run->ready_for_interrupt_injection = 1;
	switch (vcpu->arch.trap) {
	/* We're good on these - the host merely wanted to get our attention */
	case BOOK3S_INTERRUPT_HV_DECREMENTER:
		vcpu->stat.dec_exits++;
		r = RESUME_GUEST;
		break;
	case BOOK3S_INTERRUPT_EXTERNAL:
830
	case BOOK3S_INTERRUPT_H_DOORBELL:
831 832 833
		vcpu->stat.ext_intr_exits++;
		r = RESUME_GUEST;
		break;
834 835
	/* HMI is hypervisor interrupt and host has handled it. Resume guest.*/
	case BOOK3S_INTERRUPT_HMI:
836 837 838
	case BOOK3S_INTERRUPT_PERFMON:
		r = RESUME_GUEST;
		break;
839 840 841 842 843 844 845 846 847 848 849
	case BOOK3S_INTERRUPT_MACHINE_CHECK:
		/*
		 * Deliver a machine check interrupt to the guest.
		 * We have to do this, even if the host has handled the
		 * machine check, because machine checks use SRR0/1 and
		 * the interrupt might have trashed guest state in them.
		 */
		kvmppc_book3s_queue_irqprio(vcpu,
					    BOOK3S_INTERRUPT_MACHINE_CHECK);
		r = RESUME_GUEST;
		break;
850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868
	case BOOK3S_INTERRUPT_PROGRAM:
	{
		ulong flags;
		/*
		 * Normally program interrupts are delivered directly
		 * to the guest by the hardware, but we can get here
		 * as a result of a hypervisor emulation interrupt
		 * (e40) getting turned into a 700 by BML RTAS.
		 */
		flags = vcpu->arch.shregs.msr & 0x1f0000ull;
		kvmppc_core_queue_program(vcpu, flags);
		r = RESUME_GUEST;
		break;
	}
	case BOOK3S_INTERRUPT_SYSCALL:
	{
		/* hcall - punt to userspace */
		int i;

869 870 871 872
		/* hypercall with MSR_PR has already been handled in rmode,
		 * and never reaches here.
		 */

873 874 875 876 877 878 879 880 881
		run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3);
		for (i = 0; i < 9; ++i)
			run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i);
		run->exit_reason = KVM_EXIT_PAPR_HCALL;
		vcpu->arch.hcall_needed = 1;
		r = RESUME_HOST;
		break;
	}
	/*
882 883 884 885 886
	 * We get these next two if the guest accesses a page which it thinks
	 * it has mapped but which is not actually present, either because
	 * it is for an emulated I/O device or because the corresonding
	 * host page has been paged out.  Any other HDSI/HISI interrupts
	 * have been handled already.
887 888
	 */
	case BOOK3S_INTERRUPT_H_DATA_STORAGE:
889
		r = RESUME_PAGE_FAULT;
890 891
		break;
	case BOOK3S_INTERRUPT_H_INST_STORAGE:
892 893 894
		vcpu->arch.fault_dar = kvmppc_get_pc(vcpu);
		vcpu->arch.fault_dsisr = 0;
		r = RESUME_PAGE_FAULT;
895 896 897
		break;
	/*
	 * This occurs if the guest executes an illegal instruction.
898 899 900 901
	 * If the guest debug is disabled, generate a program interrupt
	 * to the guest. If guest debug is enabled, we need to check
	 * whether the instruction is a software breakpoint instruction.
	 * Accordingly return to Guest or Host.
902 903
	 */
	case BOOK3S_INTERRUPT_H_EMUL_ASSIST:
904 905 906 907
		if (vcpu->arch.emul_inst != KVM_INST_FETCH_FAILED)
			vcpu->arch.last_inst = kvmppc_need_byteswap(vcpu) ?
				swab32(vcpu->arch.emul_inst) :
				vcpu->arch.emul_inst;
908 909 910 911 912 913
		if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP) {
			r = kvmppc_emulate_debug_inst(run, vcpu);
		} else {
			kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
			r = RESUME_GUEST;
		}
914 915 916 917 918 919 920 921
		break;
	/*
	 * This occurs if the guest (kernel or userspace), does something that
	 * is prohibited by HFSCR.  We just generate a program interrupt to
	 * the guest.
	 */
	case BOOK3S_INTERRUPT_H_FAC_UNAVAIL:
		kvmppc_core_queue_program(vcpu, SRR1_PROGILL);
922 923 924 925 926 927 928
		r = RESUME_GUEST;
		break;
	default:
		kvmppc_dump_regs(vcpu);
		printk(KERN_EMERG "trap=0x%x | pc=0x%lx | msr=0x%llx\n",
			vcpu->arch.trap, kvmppc_get_pc(vcpu),
			vcpu->arch.shregs.msr);
929
		run->hw.hardware_exit_reason = vcpu->arch.trap;
930 931 932 933 934 935 936
		r = RESUME_HOST;
		break;
	}

	return r;
}

937 938
static int kvm_arch_vcpu_ioctl_get_sregs_hv(struct kvm_vcpu *vcpu,
					    struct kvm_sregs *sregs)
939 940 941 942
{
	int i;

	memset(sregs, 0, sizeof(struct kvm_sregs));
943
	sregs->pvr = vcpu->arch.pvr;
944 945 946 947 948 949 950 951
	for (i = 0; i < vcpu->arch.slb_max; i++) {
		sregs->u.s.ppc64.slb[i].slbe = vcpu->arch.slb[i].orige;
		sregs->u.s.ppc64.slb[i].slbv = vcpu->arch.slb[i].origv;
	}

	return 0;
}

952 953
static int kvm_arch_vcpu_ioctl_set_sregs_hv(struct kvm_vcpu *vcpu,
					    struct kvm_sregs *sregs)
954 955 956
{
	int i, j;

957 958 959
	/* Only accept the same PVR as the host's, since we can't spoof it */
	if (sregs->pvr != vcpu->arch.pvr)
		return -EINVAL;
960 961 962 963 964 965 966 967 968 969 970 971 972 973

	j = 0;
	for (i = 0; i < vcpu->arch.slb_nr; i++) {
		if (sregs->u.s.ppc64.slb[i].slbe & SLB_ESID_V) {
			vcpu->arch.slb[j].orige = sregs->u.s.ppc64.slb[i].slbe;
			vcpu->arch.slb[j].origv = sregs->u.s.ppc64.slb[i].slbv;
			++j;
		}
	}
	vcpu->arch.slb_max = j;

	return 0;
}

974 975
static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr,
		bool preserve_top32)
976
{
977
	struct kvm *kvm = vcpu->kvm;
978 979 980
	struct kvmppc_vcore *vc = vcpu->arch.vcore;
	u64 mask;

981
	mutex_lock(&kvm->lock);
982
	spin_lock(&vc->lock);
983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000
	/*
	 * If ILE (interrupt little-endian) has changed, update the
	 * MSR_LE bit in the intr_msr for each vcpu in this vcore.
	 */
	if ((new_lpcr & LPCR_ILE) != (vc->lpcr & LPCR_ILE)) {
		struct kvm_vcpu *vcpu;
		int i;

		kvm_for_each_vcpu(i, vcpu, kvm) {
			if (vcpu->arch.vcore != vc)
				continue;
			if (new_lpcr & LPCR_ILE)
				vcpu->arch.intr_msr |= MSR_LE;
			else
				vcpu->arch.intr_msr &= ~MSR_LE;
		}
	}

1001 1002 1003
	/*
	 * Userspace can only modify DPFD (default prefetch depth),
	 * ILE (interrupt little-endian) and TC (translation control).
1004
	 * On POWER8 userspace can also modify AIL (alt. interrupt loc.)
1005 1006
	 */
	mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
1007 1008
	if (cpu_has_feature(CPU_FTR_ARCH_207S))
		mask |= LPCR_AIL;
1009 1010 1011 1012

	/* Broken 32-bit version of LPCR must not clear top bits */
	if (preserve_top32)
		mask &= 0xFFFFFFFF;
1013 1014
	vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
	spin_unlock(&vc->lock);
1015
	mutex_unlock(&kvm->lock);
1016 1017
}

1018 1019
static int kvmppc_get_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
				 union kvmppc_one_reg *val)
1020
{
1021 1022
	int r = 0;
	long int i;
1023

1024
	switch (id) {
1025 1026 1027
	case KVM_REG_PPC_DEBUG_INST:
		*val = get_reg_val(id, KVMPPC_INST_SW_BREAKPOINT);
		break;
1028
	case KVM_REG_PPC_HIOR:
1029 1030 1031 1032 1033
		*val = get_reg_val(id, 0);
		break;
	case KVM_REG_PPC_DABR:
		*val = get_reg_val(id, vcpu->arch.dabr);
		break;
1034 1035 1036
	case KVM_REG_PPC_DABRX:
		*val = get_reg_val(id, vcpu->arch.dabrx);
		break;
1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051
	case KVM_REG_PPC_DSCR:
		*val = get_reg_val(id, vcpu->arch.dscr);
		break;
	case KVM_REG_PPC_PURR:
		*val = get_reg_val(id, vcpu->arch.purr);
		break;
	case KVM_REG_PPC_SPURR:
		*val = get_reg_val(id, vcpu->arch.spurr);
		break;
	case KVM_REG_PPC_AMR:
		*val = get_reg_val(id, vcpu->arch.amr);
		break;
	case KVM_REG_PPC_UAMOR:
		*val = get_reg_val(id, vcpu->arch.uamor);
		break;
1052
	case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1053 1054 1055 1056 1057 1058
		i = id - KVM_REG_PPC_MMCR0;
		*val = get_reg_val(id, vcpu->arch.mmcr[i]);
		break;
	case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
		i = id - KVM_REG_PPC_PMC1;
		*val = get_reg_val(id, vcpu->arch.pmc[i]);
1059
		break;
1060 1061 1062 1063
	case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
		i = id - KVM_REG_PPC_SPMC1;
		*val = get_reg_val(id, vcpu->arch.spmc[i]);
		break;
1064 1065 1066 1067 1068 1069
	case KVM_REG_PPC_SIAR:
		*val = get_reg_val(id, vcpu->arch.siar);
		break;
	case KVM_REG_PPC_SDAR:
		*val = get_reg_val(id, vcpu->arch.sdar);
		break;
1070 1071
	case KVM_REG_PPC_SIER:
		*val = get_reg_val(id, vcpu->arch.sier);
1072
		break;
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107
	case KVM_REG_PPC_IAMR:
		*val = get_reg_val(id, vcpu->arch.iamr);
		break;
	case KVM_REG_PPC_PSPB:
		*val = get_reg_val(id, vcpu->arch.pspb);
		break;
	case KVM_REG_PPC_DPDES:
		*val = get_reg_val(id, vcpu->arch.vcore->dpdes);
		break;
	case KVM_REG_PPC_DAWR:
		*val = get_reg_val(id, vcpu->arch.dawr);
		break;
	case KVM_REG_PPC_DAWRX:
		*val = get_reg_val(id, vcpu->arch.dawrx);
		break;
	case KVM_REG_PPC_CIABR:
		*val = get_reg_val(id, vcpu->arch.ciabr);
		break;
	case KVM_REG_PPC_CSIGR:
		*val = get_reg_val(id, vcpu->arch.csigr);
		break;
	case KVM_REG_PPC_TACR:
		*val = get_reg_val(id, vcpu->arch.tacr);
		break;
	case KVM_REG_PPC_TCSCR:
		*val = get_reg_val(id, vcpu->arch.tcscr);
		break;
	case KVM_REG_PPC_PID:
		*val = get_reg_val(id, vcpu->arch.pid);
		break;
	case KVM_REG_PPC_ACOP:
		*val = get_reg_val(id, vcpu->arch.acop);
		break;
	case KVM_REG_PPC_WORT:
		*val = get_reg_val(id, vcpu->arch.wort);
1108
		break;
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
	case KVM_REG_PPC_VPA_ADDR:
		spin_lock(&vcpu->arch.vpa_update_lock);
		*val = get_reg_val(id, vcpu->arch.vpa.next_gpa);
		spin_unlock(&vcpu->arch.vpa_update_lock);
		break;
	case KVM_REG_PPC_VPA_SLB:
		spin_lock(&vcpu->arch.vpa_update_lock);
		val->vpaval.addr = vcpu->arch.slb_shadow.next_gpa;
		val->vpaval.length = vcpu->arch.slb_shadow.len;
		spin_unlock(&vcpu->arch.vpa_update_lock);
		break;
	case KVM_REG_PPC_VPA_DTL:
		spin_lock(&vcpu->arch.vpa_update_lock);
		val->vpaval.addr = vcpu->arch.dtl.next_gpa;
		val->vpaval.length = vcpu->arch.dtl.len;
		spin_unlock(&vcpu->arch.vpa_update_lock);
		break;
1126 1127 1128
	case KVM_REG_PPC_TB_OFFSET:
		*val = get_reg_val(id, vcpu->arch.vcore->tb_offset);
		break;
1129
	case KVM_REG_PPC_LPCR:
1130
	case KVM_REG_PPC_LPCR_64:
1131 1132
		*val = get_reg_val(id, vcpu->arch.vcore->lpcr);
		break;
1133 1134 1135
	case KVM_REG_PPC_PPR:
		*val = get_reg_val(id, vcpu->arch.ppr);
		break;
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	case KVM_REG_PPC_TFHAR:
		*val = get_reg_val(id, vcpu->arch.tfhar);
		break;
	case KVM_REG_PPC_TFIAR:
		*val = get_reg_val(id, vcpu->arch.tfiar);
		break;
	case KVM_REG_PPC_TEXASR:
		*val = get_reg_val(id, vcpu->arch.texasr);
		break;
	case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
		i = id - KVM_REG_PPC_TM_GPR0;
		*val = get_reg_val(id, vcpu->arch.gpr_tm[i]);
		break;
	case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
	{
		int j;
		i = id - KVM_REG_PPC_TM_VSR0;
		if (i < 32)
			for (j = 0; j < TS_FPRWIDTH; j++)
				val->vsxval[j] = vcpu->arch.fp_tm.fpr[i][j];
		else {
			if (cpu_has_feature(CPU_FTR_ALTIVEC))
				val->vval = vcpu->arch.vr_tm.vr[i-32];
			else
				r = -ENXIO;
		}
		break;
	}
	case KVM_REG_PPC_TM_CR:
		*val = get_reg_val(id, vcpu->arch.cr_tm);
		break;
	case KVM_REG_PPC_TM_LR:
		*val = get_reg_val(id, vcpu->arch.lr_tm);
		break;
	case KVM_REG_PPC_TM_CTR:
		*val = get_reg_val(id, vcpu->arch.ctr_tm);
		break;
	case KVM_REG_PPC_TM_FPSCR:
		*val = get_reg_val(id, vcpu->arch.fp_tm.fpscr);
		break;
	case KVM_REG_PPC_TM_AMR:
		*val = get_reg_val(id, vcpu->arch.amr_tm);
		break;
	case KVM_REG_PPC_TM_PPR:
		*val = get_reg_val(id, vcpu->arch.ppr_tm);
		break;
	case KVM_REG_PPC_TM_VRSAVE:
		*val = get_reg_val(id, vcpu->arch.vrsave_tm);
		break;
	case KVM_REG_PPC_TM_VSCR:
		if (cpu_has_feature(CPU_FTR_ALTIVEC))
			*val = get_reg_val(id, vcpu->arch.vr_tm.vscr.u[3]);
		else
			r = -ENXIO;
		break;
	case KVM_REG_PPC_TM_DSCR:
		*val = get_reg_val(id, vcpu->arch.dscr_tm);
		break;
	case KVM_REG_PPC_TM_TAR:
		*val = get_reg_val(id, vcpu->arch.tar_tm);
		break;
#endif
1199 1200 1201
	case KVM_REG_PPC_ARCH_COMPAT:
		*val = get_reg_val(id, vcpu->arch.vcore->arch_compat);
		break;
1202
	default:
1203
		r = -EINVAL;
1204 1205 1206 1207 1208 1209
		break;
	}

	return r;
}

1210 1211
static int kvmppc_set_one_reg_hv(struct kvm_vcpu *vcpu, u64 id,
				 union kvmppc_one_reg *val)
1212
{
1213 1214
	int r = 0;
	long int i;
1215
	unsigned long addr, len;
1216

1217
	switch (id) {
1218 1219
	case KVM_REG_PPC_HIOR:
		/* Only allow this to be set to zero */
1220
		if (set_reg_val(id, *val))
1221 1222
			r = -EINVAL;
		break;
1223 1224 1225
	case KVM_REG_PPC_DABR:
		vcpu->arch.dabr = set_reg_val(id, *val);
		break;
1226 1227 1228
	case KVM_REG_PPC_DABRX:
		vcpu->arch.dabrx = set_reg_val(id, *val) & ~DABRX_HYP;
		break;
1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
	case KVM_REG_PPC_DSCR:
		vcpu->arch.dscr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_PURR:
		vcpu->arch.purr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_SPURR:
		vcpu->arch.spurr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_AMR:
		vcpu->arch.amr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_UAMOR:
		vcpu->arch.uamor = set_reg_val(id, *val);
		break;
1244
	case KVM_REG_PPC_MMCR0 ... KVM_REG_PPC_MMCRS:
1245 1246 1247 1248 1249 1250 1251
		i = id - KVM_REG_PPC_MMCR0;
		vcpu->arch.mmcr[i] = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_PMC1 ... KVM_REG_PPC_PMC8:
		i = id - KVM_REG_PPC_PMC1;
		vcpu->arch.pmc[i] = set_reg_val(id, *val);
		break;
1252 1253 1254 1255
	case KVM_REG_PPC_SPMC1 ... KVM_REG_PPC_SPMC2:
		i = id - KVM_REG_PPC_SPMC1;
		vcpu->arch.spmc[i] = set_reg_val(id, *val);
		break;
1256 1257 1258 1259 1260 1261
	case KVM_REG_PPC_SIAR:
		vcpu->arch.siar = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_SDAR:
		vcpu->arch.sdar = set_reg_val(id, *val);
		break;
1262 1263
	case KVM_REG_PPC_SIER:
		vcpu->arch.sier = set_reg_val(id, *val);
1264
		break;
1265 1266 1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302
	case KVM_REG_PPC_IAMR:
		vcpu->arch.iamr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_PSPB:
		vcpu->arch.pspb = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_DPDES:
		vcpu->arch.vcore->dpdes = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_DAWR:
		vcpu->arch.dawr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_DAWRX:
		vcpu->arch.dawrx = set_reg_val(id, *val) & ~DAWRX_HYP;
		break;
	case KVM_REG_PPC_CIABR:
		vcpu->arch.ciabr = set_reg_val(id, *val);
		/* Don't allow setting breakpoints in hypervisor code */
		if ((vcpu->arch.ciabr & CIABR_PRIV) == CIABR_PRIV_HYPER)
			vcpu->arch.ciabr &= ~CIABR_PRIV;	/* disable */
		break;
	case KVM_REG_PPC_CSIGR:
		vcpu->arch.csigr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TACR:
		vcpu->arch.tacr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TCSCR:
		vcpu->arch.tcscr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_PID:
		vcpu->arch.pid = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_ACOP:
		vcpu->arch.acop = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_WORT:
		vcpu->arch.wort = set_reg_val(id, *val);
1303
		break;
1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323
	case KVM_REG_PPC_VPA_ADDR:
		addr = set_reg_val(id, *val);
		r = -EINVAL;
		if (!addr && (vcpu->arch.slb_shadow.next_gpa ||
			      vcpu->arch.dtl.next_gpa))
			break;
		r = set_vpa(vcpu, &vcpu->arch.vpa, addr, sizeof(struct lppaca));
		break;
	case KVM_REG_PPC_VPA_SLB:
		addr = val->vpaval.addr;
		len = val->vpaval.length;
		r = -EINVAL;
		if (addr && !vcpu->arch.vpa.next_gpa)
			break;
		r = set_vpa(vcpu, &vcpu->arch.slb_shadow, addr, len);
		break;
	case KVM_REG_PPC_VPA_DTL:
		addr = val->vpaval.addr;
		len = val->vpaval.length;
		r = -EINVAL;
1324 1325
		if (addr && (len < sizeof(struct dtl_entry) ||
			     !vcpu->arch.vpa.next_gpa))
1326 1327 1328 1329
			break;
		len -= len % sizeof(struct dtl_entry);
		r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);
		break;
1330 1331 1332 1333 1334
	case KVM_REG_PPC_TB_OFFSET:
		/* round up to multiple of 2^24 */
		vcpu->arch.vcore->tb_offset =
			ALIGN(set_reg_val(id, *val), 1UL << 24);
		break;
1335
	case KVM_REG_PPC_LPCR:
1336 1337 1338 1339
		kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), true);
		break;
	case KVM_REG_PPC_LPCR_64:
		kvmppc_set_lpcr(vcpu, set_reg_val(id, *val), false);
1340
		break;
1341 1342 1343
	case KVM_REG_PPC_PPR:
		vcpu->arch.ppr = set_reg_val(id, *val);
		break;
1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
	case KVM_REG_PPC_TFHAR:
		vcpu->arch.tfhar = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TFIAR:
		vcpu->arch.tfiar = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TEXASR:
		vcpu->arch.texasr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_GPR0 ... KVM_REG_PPC_TM_GPR31:
		i = id - KVM_REG_PPC_TM_GPR0;
		vcpu->arch.gpr_tm[i] = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_VSR0 ... KVM_REG_PPC_TM_VSR63:
	{
		int j;
		i = id - KVM_REG_PPC_TM_VSR0;
		if (i < 32)
			for (j = 0; j < TS_FPRWIDTH; j++)
				vcpu->arch.fp_tm.fpr[i][j] = val->vsxval[j];
		else
			if (cpu_has_feature(CPU_FTR_ALTIVEC))
				vcpu->arch.vr_tm.vr[i-32] = val->vval;
			else
				r = -ENXIO;
		break;
	}
	case KVM_REG_PPC_TM_CR:
		vcpu->arch.cr_tm = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_LR:
		vcpu->arch.lr_tm = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_CTR:
		vcpu->arch.ctr_tm = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_FPSCR:
		vcpu->arch.fp_tm.fpscr = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_AMR:
		vcpu->arch.amr_tm = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_PPR:
		vcpu->arch.ppr_tm = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_VRSAVE:
		vcpu->arch.vrsave_tm = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_VSCR:
		if (cpu_has_feature(CPU_FTR_ALTIVEC))
			vcpu->arch.vr.vscr.u[3] = set_reg_val(id, *val);
		else
			r = - ENXIO;
		break;
	case KVM_REG_PPC_TM_DSCR:
		vcpu->arch.dscr_tm = set_reg_val(id, *val);
		break;
	case KVM_REG_PPC_TM_TAR:
		vcpu->arch.tar_tm = set_reg_val(id, *val);
		break;
#endif
1406 1407 1408
	case KVM_REG_PPC_ARCH_COMPAT:
		r = kvmppc_set_arch_compat(vcpu, set_reg_val(id, *val));
		break;
1409
	default:
1410
		r = -EINVAL;
1411 1412 1413 1414 1415 1416
		break;
	}

	return r;
}

1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427
static struct kvmppc_vcore *kvmppc_vcore_create(struct kvm *kvm, int core)
{
	struct kvmppc_vcore *vcore;

	vcore = kzalloc(sizeof(struct kvmppc_vcore), GFP_KERNEL);

	if (vcore == NULL)
		return NULL;

	INIT_LIST_HEAD(&vcore->runnable_threads);
	spin_lock_init(&vcore->lock);
1428
	spin_lock_init(&vcore->stoltb_lock);
1429 1430 1431 1432 1433 1434
	init_waitqueue_head(&vcore->wq);
	vcore->preempt_tb = TB_NIL;
	vcore->lpcr = kvm->arch.lpcr;
	vcore->first_vcpuid = core * threads_per_subcore;
	vcore->kvm = kvm;

1435 1436 1437 1438 1439 1440 1441
	vcore->mpp_buffer_is_valid = false;

	if (cpu_has_feature(CPU_FTR_ARCH_207S))
		vcore->mpp_buffer = (void *)__get_free_pages(
			GFP_KERNEL|__GFP_ZERO,
			MPP_BUFFER_ORDER);

1442 1443 1444
	return vcore;
}

1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
#ifdef CONFIG_KVM_BOOK3S_HV_EXIT_TIMING
static struct debugfs_timings_element {
	const char *name;
	size_t offset;
} timings[] = {
	{"rm_entry",	offsetof(struct kvm_vcpu, arch.rm_entry)},
	{"rm_intr",	offsetof(struct kvm_vcpu, arch.rm_intr)},
	{"rm_exit",	offsetof(struct kvm_vcpu, arch.rm_exit)},
	{"guest",	offsetof(struct kvm_vcpu, arch.guest_time)},
	{"cede",	offsetof(struct kvm_vcpu, arch.cede_time)},
};

#define N_TIMINGS	(sizeof(timings) / sizeof(timings[0]))

struct debugfs_timings_state {
	struct kvm_vcpu	*vcpu;
	unsigned int	buflen;
	char		buf[N_TIMINGS * 100];
};

static int debugfs_timings_open(struct inode *inode, struct file *file)
{
	struct kvm_vcpu *vcpu = inode->i_private;
	struct debugfs_timings_state *p;

	p = kzalloc(sizeof(*p), GFP_KERNEL);
	if (!p)
		return -ENOMEM;

	kvm_get_kvm(vcpu->kvm);
	p->vcpu = vcpu;
	file->private_data = p;

	return nonseekable_open(inode, file);
}

static int debugfs_timings_release(struct inode *inode, struct file *file)
{
	struct debugfs_timings_state *p = file->private_data;

	kvm_put_kvm(p->vcpu->kvm);
	kfree(p);
	return 0;
}

static ssize_t debugfs_timings_read(struct file *file, char __user *buf,
				    size_t len, loff_t *ppos)
{
	struct debugfs_timings_state *p = file->private_data;
	struct kvm_vcpu *vcpu = p->vcpu;
	char *s, *buf_end;
	struct kvmhv_tb_accumulator tb;
	u64 count;
	loff_t pos;
	ssize_t n;
	int i, loops;
	bool ok;

	if (!p->buflen) {
		s = p->buf;
		buf_end = s + sizeof(p->buf);
		for (i = 0; i < N_TIMINGS; ++i) {
			struct kvmhv_tb_accumulator *acc;

			acc = (struct kvmhv_tb_accumulator *)
				((unsigned long)vcpu + timings[i].offset);
			ok = false;
			for (loops = 0; loops < 1000; ++loops) {
				count = acc->seqcount;
				if (!(count & 1)) {
					smp_rmb();
					tb = *acc;
					smp_rmb();
					if (count == acc->seqcount) {
						ok = true;
						break;
					}
				}
				udelay(1);
			}
			if (!ok)
				snprintf(s, buf_end - s, "%s: stuck\n",
					timings[i].name);
			else
				snprintf(s, buf_end - s,
					"%s: %llu %llu %llu %llu\n",
					timings[i].name, count / 2,
					tb_to_ns(tb.tb_total),
					tb_to_ns(tb.tb_min),
					tb_to_ns(tb.tb_max));
			s += strlen(s);
		}
		p->buflen = s - p->buf;
	}

	pos = *ppos;
	if (pos >= p->buflen)
		return 0;
	if (len > p->buflen - pos)
		len = p->buflen - pos;
	n = copy_to_user(buf, p->buf + pos, len);
	if (n) {
		if (n == len)
			return -EFAULT;
		len -= n;
	}
	*ppos = pos + len;
	return len;
}

static ssize_t debugfs_timings_write(struct file *file, const char __user *buf,
				     size_t len, loff_t *ppos)
{
	return -EACCES;
}

static const struct file_operations debugfs_timings_ops = {
	.owner	 = THIS_MODULE,
	.open	 = debugfs_timings_open,
	.release = debugfs_timings_release,
	.read	 = debugfs_timings_read,
	.write	 = debugfs_timings_write,
	.llseek	 = generic_file_llseek,
};

/* Create a debugfs directory for the vcpu */
static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
{
	char buf[16];
	struct kvm *kvm = vcpu->kvm;

	snprintf(buf, sizeof(buf), "vcpu%u", id);
	if (IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
		return;
	vcpu->arch.debugfs_dir = debugfs_create_dir(buf, kvm->arch.debugfs_dir);
	if (IS_ERR_OR_NULL(vcpu->arch.debugfs_dir))
		return;
	vcpu->arch.debugfs_timings =
		debugfs_create_file("timings", 0444, vcpu->arch.debugfs_dir,
				    vcpu, &debugfs_timings_ops);
}

#else /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */
static void debugfs_vcpu_init(struct kvm_vcpu *vcpu, unsigned int id)
{
}
#endif /* CONFIG_KVM_BOOK3S_HV_EXIT_TIMING */

1593 1594
static struct kvm_vcpu *kvmppc_core_vcpu_create_hv(struct kvm *kvm,
						   unsigned int id)
1595 1596
{
	struct kvm_vcpu *vcpu;
1597 1598 1599
	int err = -EINVAL;
	int core;
	struct kvmppc_vcore *vcore;
1600

1601
	core = id / threads_per_subcore;
1602 1603 1604 1605
	if (core >= KVM_MAX_VCORES)
		goto out;

	err = -ENOMEM;
1606
	vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
1607 1608 1609 1610 1611 1612 1613 1614
	if (!vcpu)
		goto out;

	err = kvm_vcpu_init(vcpu, kvm, id);
	if (err)
		goto free_vcpu;

	vcpu->arch.shared = &vcpu->arch.shregs;
1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625
#ifdef CONFIG_KVM_BOOK3S_PR_POSSIBLE
	/*
	 * The shared struct is never shared on HV,
	 * so we can always use host endianness
	 */
#ifdef __BIG_ENDIAN__
	vcpu->arch.shared_big_endian = true;
#else
	vcpu->arch.shared_big_endian = false;
#endif
#endif
1626 1627 1628
	vcpu->arch.mmcr[0] = MMCR0_FC;
	vcpu->arch.ctrl = CTRL_RUNLATCH;
	/* default to host PVR, since we can't spoof it */
1629
	kvmppc_set_pvr_hv(vcpu, mfspr(SPRN_PVR));
1630
	spin_lock_init(&vcpu->arch.vpa_update_lock);
1631 1632
	spin_lock_init(&vcpu->arch.tbacct_lock);
	vcpu->arch.busy_preempt = TB_NIL;
1633
	vcpu->arch.intr_msr = MSR_SF | MSR_ME;
1634 1635 1636

	kvmppc_mmu_book3s_hv_init(vcpu);

1637
	vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
1638 1639 1640 1641 1642 1643

	init_waitqueue_head(&vcpu->arch.cpu_run);

	mutex_lock(&kvm->lock);
	vcore = kvm->arch.vcores[core];
	if (!vcore) {
1644
		vcore = kvmppc_vcore_create(kvm, core);
1645
		kvm->arch.vcores[core] = vcore;
1646
		kvm->arch.online_vcores++;
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
	}
	mutex_unlock(&kvm->lock);

	if (!vcore)
		goto free_vcpu;

	spin_lock(&vcore->lock);
	++vcore->num_threads;
	spin_unlock(&vcore->lock);
	vcpu->arch.vcore = vcore;
1657
	vcpu->arch.ptid = vcpu->vcpu_id - vcore->first_vcpuid;
1658

1659 1660 1661
	vcpu->arch.cpu_type = KVM_CPU_3S_64;
	kvmppc_sanity_check(vcpu);

1662 1663
	debugfs_vcpu_init(vcpu, id);

1664 1665 1666
	return vcpu;

free_vcpu:
1667
	kmem_cache_free(kvm_vcpu_cache, vcpu);
1668 1669 1670 1671
out:
	return ERR_PTR(err);
}

1672 1673 1674 1675 1676 1677 1678
static void unpin_vpa(struct kvm *kvm, struct kvmppc_vpa *vpa)
{
	if (vpa->pinned_addr)
		kvmppc_unpin_guest_page(kvm, vpa->pinned_addr, vpa->gpa,
					vpa->dirty);
}

1679
static void kvmppc_core_vcpu_free_hv(struct kvm_vcpu *vcpu)
1680
{
1681
	spin_lock(&vcpu->arch.vpa_update_lock);
1682 1683 1684
	unpin_vpa(vcpu->kvm, &vcpu->arch.dtl);
	unpin_vpa(vcpu->kvm, &vcpu->arch.slb_shadow);
	unpin_vpa(vcpu->kvm, &vcpu->arch.vpa);
1685
	spin_unlock(&vcpu->arch.vpa_update_lock);
1686
	kvm_vcpu_uninit(vcpu);
1687
	kmem_cache_free(kvm_vcpu_cache, vcpu);
1688 1689
}

1690 1691 1692 1693 1694 1695
static int kvmppc_core_check_requests_hv(struct kvm_vcpu *vcpu)
{
	/* Indicate we want to get back into the guest */
	return 1;
}

1696
static void kvmppc_set_timer(struct kvm_vcpu *vcpu)
1697
{
1698
	unsigned long dec_nsec, now;
1699

1700 1701 1702 1703
	now = get_tb();
	if (now > vcpu->arch.dec_expires) {
		/* decrementer has already gone negative */
		kvmppc_core_queue_dec(vcpu);
1704
		kvmppc_core_prepare_to_enter(vcpu);
1705
		return;
1706
	}
1707 1708 1709 1710 1711
	dec_nsec = (vcpu->arch.dec_expires - now) * NSEC_PER_SEC
		   / tb_ticks_per_sec;
	hrtimer_start(&vcpu->arch.dec_timer, ktime_set(0, dec_nsec),
		      HRTIMER_MODE_REL);
	vcpu->arch.timer_running = 1;
1712 1713
}

1714
static void kvmppc_end_cede(struct kvm_vcpu *vcpu)
1715
{
1716 1717 1718 1719 1720
	vcpu->arch.ceded = 0;
	if (vcpu->arch.timer_running) {
		hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
		vcpu->arch.timer_running = 0;
	}
1721 1722
}

1723
extern void __kvmppc_vcore_entry(void);
1724

1725 1726
static void kvmppc_remove_runnable(struct kvmppc_vcore *vc,
				   struct kvm_vcpu *vcpu)
1727
{
1728 1729
	u64 now;

1730 1731
	if (vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
		return;
1732
	spin_lock_irq(&vcpu->arch.tbacct_lock);
1733 1734 1735 1736 1737
	now = mftb();
	vcpu->arch.busy_stolen += vcore_stolen_time(vc, now) -
		vcpu->arch.stolen_logged;
	vcpu->arch.busy_preempt = now;
	vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
1738
	spin_unlock_irq(&vcpu->arch.tbacct_lock);
1739 1740 1741 1742
	--vc->n_runnable;
	list_del(&vcpu->arch.run_list);
}

1743 1744 1745
static int kvmppc_grab_hwthread(int cpu)
{
	struct paca_struct *tpaca;
1746
	long timeout = 10000;
1747 1748 1749 1750

	tpaca = &paca[cpu];

	/* Ensure the thread won't go into the kernel if it wakes */
1751
	tpaca->kvm_hstate.kvm_vcpu = NULL;
1752 1753 1754
	tpaca->kvm_hstate.napping = 0;
	smp_wmb();
	tpaca->kvm_hstate.hwthread_req = 1;
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

	/*
	 * If the thread is already executing in the kernel (e.g. handling
	 * a stray interrupt), wait for it to get back to nap mode.
	 * The smp_mb() is to ensure that our setting of hwthread_req
	 * is visible before we look at hwthread_state, so if this
	 * races with the code at system_reset_pSeries and the thread
	 * misses our setting of hwthread_req, we are sure to see its
	 * setting of hwthread_state, and vice versa.
	 */
	smp_mb();
	while (tpaca->kvm_hstate.hwthread_state == KVM_HWTHREAD_IN_KERNEL) {
		if (--timeout <= 0) {
			pr_err("KVM: couldn't grab cpu %d\n", cpu);
			return -EBUSY;
		}
		udelay(1);
	}
	return 0;
}

static void kvmppc_release_hwthread(int cpu)
{
	struct paca_struct *tpaca;

	tpaca = &paca[cpu];
	tpaca->kvm_hstate.hwthread_req = 0;
	tpaca->kvm_hstate.kvm_vcpu = NULL;
}

1785 1786 1787 1788 1789 1790
static void kvmppc_start_thread(struct kvm_vcpu *vcpu)
{
	int cpu;
	struct paca_struct *tpaca;
	struct kvmppc_vcore *vc = vcpu->arch.vcore;

1791 1792 1793 1794
	if (vcpu->arch.timer_running) {
		hrtimer_try_to_cancel(&vcpu->arch.dec_timer);
		vcpu->arch.timer_running = 0;
	}
1795 1796 1797
	cpu = vc->pcpu + vcpu->arch.ptid;
	tpaca = &paca[cpu];
	tpaca->kvm_hstate.kvm_vcore = vc;
1798
	tpaca->kvm_hstate.ptid = vcpu->arch.ptid;
1799
	vcpu->cpu = vc->pcpu;
1800
	/* Order stores to hstate.kvm_vcore etc. before store to kvm_vcpu */
1801
	smp_wmb();
1802 1803
	tpaca->kvm_hstate.kvm_vcpu = vcpu;
	if (cpu != smp_processor_id())
1804
		kvmppc_ipi_thread(cpu);
1805
}
1806

1807
static void kvmppc_wait_for_nap(void)
1808
{
1809 1810
	int cpu = smp_processor_id();
	int i, loops;
1811

1812 1813 1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824
	for (loops = 0; loops < 1000000; ++loops) {
		/*
		 * Check if all threads are finished.
		 * We set the vcpu pointer when starting a thread
		 * and the thread clears it when finished, so we look
		 * for any threads that still have a non-NULL vcpu ptr.
		 */
		for (i = 1; i < threads_per_subcore; ++i)
			if (paca[cpu + i].kvm_hstate.kvm_vcpu)
				break;
		if (i == threads_per_subcore) {
			HMT_medium();
			return;
1825
		}
1826
		HMT_low();
1827 1828
	}
	HMT_medium();
1829 1830 1831
	for (i = 1; i < threads_per_subcore; ++i)
		if (paca[cpu + i].kvm_hstate.kvm_vcpu)
			pr_err("KVM: CPU %d seems to be stuck\n", cpu + i);
1832 1833 1834 1835
}

/*
 * Check that we are on thread 0 and that any other threads in
1836 1837
 * this core are off-line.  Then grab the threads so they can't
 * enter the kernel.
1838 1839 1840 1841
 */
static int on_primary_thread(void)
{
	int cpu = smp_processor_id();
1842
	int thr;
1843

1844 1845
	/* Are we on a primary subcore? */
	if (cpu_thread_in_subcore(cpu))
1846
		return 0;
1847 1848 1849

	thr = 0;
	while (++thr < threads_per_subcore)
1850 1851
		if (cpu_online(cpu + thr))
			return 0;
1852 1853

	/* Grab all hw threads so they can't go into the kernel */
1854
	for (thr = 1; thr < threads_per_subcore; ++thr) {
1855 1856 1857 1858 1859 1860 1861 1862
		if (kvmppc_grab_hwthread(cpu + thr)) {
			/* Couldn't grab one; let the others go */
			do {
				kvmppc_release_hwthread(cpu + thr);
			} while (--thr > 0);
			return 0;
		}
	}
1863 1864 1865
	return 1;
}

1866 1867 1868 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892
static void kvmppc_start_saving_l2_cache(struct kvmppc_vcore *vc)
{
	phys_addr_t phy_addr, mpp_addr;

	phy_addr = (phys_addr_t)virt_to_phys(vc->mpp_buffer);
	mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK;

	mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_ABORT);
	logmpp(mpp_addr | PPC_LOGMPP_LOG_L2);

	vc->mpp_buffer_is_valid = true;
}

static void kvmppc_start_restoring_l2_cache(const struct kvmppc_vcore *vc)
{
	phys_addr_t phy_addr, mpp_addr;

	phy_addr = virt_to_phys(vc->mpp_buffer);
	mpp_addr = phy_addr & PPC_MPPE_ADDRESS_MASK;

	/* We must abort any in-progress save operations to ensure
	 * the table is valid so that prefetch engine knows when to
	 * stop prefetching. */
	logmpp(mpp_addr | PPC_LOGMPP_LOG_ABORT);
	mtspr(SPRN_MPPR, mpp_addr | PPC_MPPR_FETCH_WHOLE_TABLE);
}

1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911
static void prepare_threads(struct kvmppc_vcore *vc)
{
	struct kvm_vcpu *vcpu, *vnext;

	list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
				 arch.run_list) {
		if (signal_pending(vcpu->arch.run_task))
			vcpu->arch.ret = -EINTR;
		else if (vcpu->arch.vpa.update_pending ||
			 vcpu->arch.slb_shadow.update_pending ||
			 vcpu->arch.dtl.update_pending)
			vcpu->arch.ret = RESUME_GUEST;
		else
			continue;
		kvmppc_remove_runnable(vc, vcpu);
		wake_up(&vcpu->arch.cpu_run);
	}
}

1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948
static void post_guest_process(struct kvmppc_vcore *vc)
{
	u64 now;
	long ret;
	struct kvm_vcpu *vcpu, *vnext;

	now = get_tb();
	list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
				 arch.run_list) {
		/* cancel pending dec exception if dec is positive */
		if (now < vcpu->arch.dec_expires &&
		    kvmppc_core_pending_dec(vcpu))
			kvmppc_core_dequeue_dec(vcpu);

		trace_kvm_guest_exit(vcpu);

		ret = RESUME_GUEST;
		if (vcpu->arch.trap)
			ret = kvmppc_handle_exit_hv(vcpu->arch.kvm_run, vcpu,
						    vcpu->arch.run_task);

		vcpu->arch.ret = ret;
		vcpu->arch.trap = 0;

		if (vcpu->arch.ceded) {
			if (!is_kvmppc_resume_guest(ret))
				kvmppc_end_cede(vcpu);
			else
				kvmppc_set_timer(vcpu);
		}
		if (!is_kvmppc_resume_guest(vcpu->arch.ret)) {
			kvmppc_remove_runnable(vc, vcpu);
			wake_up(&vcpu->arch.cpu_run);
		}
	}
}

1949 1950 1951 1952
/*
 * Run a set of guest threads on a physical core.
 * Called with vc->lock held.
 */
1953
static noinline void kvmppc_run_core(struct kvmppc_vcore *vc)
1954
{
1955
	struct kvm_vcpu *vcpu, *vnext;
1956
	int i;
1957
	int srcu_idx;
1958

1959 1960 1961 1962 1963 1964 1965 1966 1967
	/*
	 * Remove from the list any threads that have a signal pending
	 * or need a VPA update done
	 */
	prepare_threads(vc);

	/* if the runner is no longer runnable, let the caller pick a new one */
	if (vc->runner->arch.state != KVMPPC_VCPU_RUNNABLE)
		return;
1968 1969

	/*
1970
	 * Initialize *vc.
1971
	 */
1972
	vc->entry_exit_map = 0;
1973
	vc->preempt_tb = TB_NIL;
1974 1975
	vc->in_guest = 0;
	vc->napping_threads = 0;
1976
	vc->conferring_threads = 0;
1977

1978
	/*
1979 1980 1981
	 * Make sure we are running on primary threads, and that secondary
	 * threads are offline.  Also check if the number of threads in this
	 * guest are greater than the current system threads per guest.
1982
	 */
1983 1984
	if ((threads_per_core > 1) &&
	    ((vc->num_threads > threads_per_subcore) || !on_primary_thread())) {
1985 1986
		list_for_each_entry_safe(vcpu, vnext, &vc->runnable_threads,
					 arch.run_list) {
1987
			vcpu->arch.ret = -EBUSY;
1988 1989 1990
			kvmppc_remove_runnable(vc, vcpu);
			wake_up(&vcpu->arch.cpu_run);
		}
1991 1992 1993
		goto out;
	}

1994

1995
	vc->pcpu = smp_processor_id();
1996
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
1997
		kvmppc_start_thread(vcpu);
1998
		kvmppc_create_dtl_entry(vcpu, vc);
1999
		trace_kvm_guest_enter(vcpu);
2000
	}
2001

2002 2003 2004 2005
	/* Set this explicitly in case thread 0 doesn't have a vcpu */
	get_paca()->kvm_hstate.kvm_vcore = vc;
	get_paca()->kvm_hstate.ptid = 0;

2006
	vc->vcore_state = VCORE_RUNNING;
2007
	preempt_disable();
2008 2009 2010

	trace_kvmppc_run_core(vc, 0);

2011
	spin_unlock(&vc->lock);
2012

2013
	kvm_guest_enter();
2014

2015
	srcu_idx = srcu_read_lock(&vc->kvm->srcu);
2016

2017 2018 2019
	if (vc->mpp_buffer_is_valid)
		kvmppc_start_restoring_l2_cache(vc);

2020
	__kvmppc_vcore_entry();
2021

2022
	spin_lock(&vc->lock);
2023 2024 2025 2026

	if (vc->mpp_buffer)
		kvmppc_start_saving_l2_cache(vc);

2027 2028 2029 2030
	/* disable sending of IPIs on virtual external irqs */
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list)
		vcpu->cpu = -1;
	/* wait for secondary threads to finish writing their state to memory */
2031
	kvmppc_wait_for_nap();
2032
	for (i = 0; i < threads_per_subcore; ++i)
2033
		kvmppc_release_hwthread(vc->pcpu + i);
2034
	/* prevent other vcpu threads from doing kvmppc_start_thread() now */
2035
	vc->vcore_state = VCORE_EXITING;
2036 2037
	spin_unlock(&vc->lock);

2038
	srcu_read_unlock(&vc->kvm->srcu, srcu_idx);
2039

2040 2041
	/* make sure updates to secondary vcpu structs are visible now */
	smp_mb();
2042 2043 2044 2045
	kvm_guest_exit();

	preempt_enable();

2046
	spin_lock(&vc->lock);
2047
	post_guest_process(vc);
2048 2049

 out:
2050
	vc->vcore_state = VCORE_INACTIVE;
2051
	trace_kvmppc_run_core(vc, 1);
2052 2053
}

2054 2055 2056 2057 2058
/*
 * Wait for some other vcpu thread to execute us, and
 * wake us up when we need to handle something in the host.
 */
static void kvmppc_wait_for_exec(struct kvm_vcpu *vcpu, int wait_state)
2059 2060 2061
{
	DEFINE_WAIT(wait);

2062 2063 2064 2065 2066 2067 2068 2069 2070 2071 2072 2073
	prepare_to_wait(&vcpu->arch.cpu_run, &wait, wait_state);
	if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE)
		schedule();
	finish_wait(&vcpu->arch.cpu_run, &wait);
}

/*
 * All the vcpus in this vcore are idle, so wait for a decrementer
 * or external interrupt to one of the vcpus.  vc->lock is held.
 */
static void kvmppc_vcore_blocked(struct kvmppc_vcore *vc)
{
2074 2075 2076
	struct kvm_vcpu *vcpu;
	int do_sleep = 1;

2077 2078 2079
	DEFINE_WAIT(wait);

	prepare_to_wait(&vc->wq, &wait, TASK_INTERRUPTIBLE);
2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096

	/*
	 * Check one last time for pending exceptions and ceded state after
	 * we put ourselves on the wait queue
	 */
	list_for_each_entry(vcpu, &vc->runnable_threads, arch.run_list) {
		if (vcpu->arch.pending_exceptions || !vcpu->arch.ceded) {
			do_sleep = 0;
			break;
		}
	}

	if (!do_sleep) {
		finish_wait(&vc->wq, &wait);
		return;
	}

2097
	vc->vcore_state = VCORE_SLEEPING;
2098
	trace_kvmppc_vcore_blocked(vc, 0);
2099
	spin_unlock(&vc->lock);
2100
	schedule();
2101 2102 2103
	finish_wait(&vc->wq, &wait);
	spin_lock(&vc->lock);
	vc->vcore_state = VCORE_INACTIVE;
2104
	trace_kvmppc_vcore_blocked(vc, 1);
2105
}
2106

2107 2108 2109 2110 2111
static int kvmppc_run_vcpu(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu)
{
	int n_ceded;
	struct kvmppc_vcore *vc;
	struct kvm_vcpu *v, *vn;
2112

2113 2114
	trace_kvmppc_run_vcpu_enter(vcpu);

2115 2116 2117
	kvm_run->exit_reason = 0;
	vcpu->arch.ret = RESUME_GUEST;
	vcpu->arch.trap = 0;
2118
	kvmppc_update_vpas(vcpu);
2119 2120 2121 2122 2123 2124

	/*
	 * Synchronize with other threads in this virtual core
	 */
	vc = vcpu->arch.vcore;
	spin_lock(&vc->lock);
2125
	vcpu->arch.ceded = 0;
2126 2127
	vcpu->arch.run_task = current;
	vcpu->arch.kvm_run = kvm_run;
2128
	vcpu->arch.stolen_logged = vcore_stolen_time(vc, mftb());
2129
	vcpu->arch.state = KVMPPC_VCPU_RUNNABLE;
2130
	vcpu->arch.busy_preempt = TB_NIL;
2131 2132 2133
	list_add_tail(&vcpu->arch.run_list, &vc->runnable_threads);
	++vc->n_runnable;

2134 2135 2136 2137 2138
	/*
	 * This happens the first time this is called for a vcpu.
	 * If the vcore is already running, we may be able to start
	 * this thread straight away and have it join in.
	 */
2139
	if (!signal_pending(current)) {
2140
		if (vc->vcore_state == VCORE_RUNNING && !VCORE_IS_EXITING(vc)) {
2141
			kvmppc_create_dtl_entry(vcpu, vc);
2142
			kvmppc_start_thread(vcpu);
2143
			trace_kvm_guest_enter(vcpu);
2144 2145
		} else if (vc->vcore_state == VCORE_SLEEPING) {
			wake_up(&vc->wq);
2146 2147
		}

2148
	}
2149

2150 2151
	while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
	       !signal_pending(current)) {
2152
		if (vc->vcore_state != VCORE_INACTIVE) {
2153 2154 2155 2156 2157 2158 2159
			spin_unlock(&vc->lock);
			kvmppc_wait_for_exec(vcpu, TASK_INTERRUPTIBLE);
			spin_lock(&vc->lock);
			continue;
		}
		list_for_each_entry_safe(v, vn, &vc->runnable_threads,
					 arch.run_list) {
2160
			kvmppc_core_prepare_to_enter(v);
2161 2162 2163 2164 2165 2166 2167 2168
			if (signal_pending(v->arch.run_task)) {
				kvmppc_remove_runnable(vc, v);
				v->stat.signal_exits++;
				v->arch.kvm_run->exit_reason = KVM_EXIT_INTR;
				v->arch.ret = -EINTR;
				wake_up(&v->arch.cpu_run);
			}
		}
2169 2170 2171
		if (!vc->n_runnable || vcpu->arch.state != KVMPPC_VCPU_RUNNABLE)
			break;
		n_ceded = 0;
2172
		list_for_each_entry(v, &vc->runnable_threads, arch.run_list) {
2173 2174
			if (!v->arch.pending_exceptions)
				n_ceded += v->arch.ceded;
2175 2176 2177
			else
				v->arch.ceded = 0;
		}
2178 2179
		vc->runner = vcpu;
		if (n_ceded == vc->n_runnable) {
2180
			kvmppc_vcore_blocked(vc);
2181 2182 2183 2184 2185 2186
		} else if (should_resched()) {
			vc->vcore_state = VCORE_PREEMPT;
			/* Let something else run */
			cond_resched_lock(&vc->lock);
			vc->vcore_state = VCORE_INACTIVE;
		} else {
2187
			kvmppc_run_core(vc);
2188
		}
2189
		vc->runner = NULL;
2190
	}
2191

2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211
	while (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE &&
	       (vc->vcore_state == VCORE_RUNNING ||
		vc->vcore_state == VCORE_EXITING)) {
		spin_unlock(&vc->lock);
		kvmppc_wait_for_exec(vcpu, TASK_UNINTERRUPTIBLE);
		spin_lock(&vc->lock);
	}

	if (vcpu->arch.state == KVMPPC_VCPU_RUNNABLE) {
		kvmppc_remove_runnable(vc, vcpu);
		vcpu->stat.signal_exits++;
		kvm_run->exit_reason = KVM_EXIT_INTR;
		vcpu->arch.ret = -EINTR;
	}

	if (vc->n_runnable && vc->vcore_state == VCORE_INACTIVE) {
		/* Wake up some vcpu to run the core */
		v = list_first_entry(&vc->runnable_threads,
				     struct kvm_vcpu, arch.run_list);
		wake_up(&v->arch.cpu_run);
2212 2213
	}

2214
	trace_kvmppc_run_vcpu_exit(vcpu, kvm_run);
2215 2216
	spin_unlock(&vc->lock);
	return vcpu->arch.ret;
2217 2218
}

2219
static int kvmppc_vcpu_run_hv(struct kvm_run *run, struct kvm_vcpu *vcpu)
2220 2221
{
	int r;
2222
	int srcu_idx;
2223

2224 2225 2226 2227 2228
	if (!vcpu->arch.sane) {
		run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
		return -EINVAL;
	}

2229 2230
	kvmppc_core_prepare_to_enter(vcpu);

2231 2232 2233 2234 2235 2236
	/* No need to go into the guest when all we'll do is come back out */
	if (signal_pending(current)) {
		run->exit_reason = KVM_EXIT_INTR;
		return -EINTR;
	}

2237
	atomic_inc(&vcpu->kvm->arch.vcpus_running);
2238
	/* Order vcpus_running vs. hpte_setup_done, see kvmppc_alloc_reset_hpt */
2239 2240
	smp_mb();

2241
	/* On the first time here, set up HTAB and VRMA */
2242
	if (!vcpu->kvm->arch.hpte_setup_done) {
2243
		r = kvmppc_hv_setup_htab_rma(vcpu);
2244
		if (r)
2245
			goto out;
2246
	}
2247 2248 2249 2250 2251

	flush_fp_to_thread(current);
	flush_altivec_to_thread(current);
	flush_vsx_to_thread(current);
	vcpu->arch.wqp = &vcpu->arch.vcore->wq;
2252
	vcpu->arch.pgdir = current->mm->pgd;
2253
	vcpu->arch.state = KVMPPC_VCPU_BUSY_IN_HOST;
2254

2255 2256 2257 2258 2259
	do {
		r = kvmppc_run_vcpu(run, vcpu);

		if (run->exit_reason == KVM_EXIT_PAPR_HCALL &&
		    !(vcpu->arch.shregs.msr & MSR_PR)) {
2260
			trace_kvm_hcall_enter(vcpu);
2261
			r = kvmppc_pseries_do_hcall(vcpu);
2262
			trace_kvm_hcall_exit(vcpu, r);
2263
			kvmppc_core_prepare_to_enter(vcpu);
2264 2265 2266 2267 2268
		} else if (r == RESUME_PAGE_FAULT) {
			srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
			r = kvmppc_book3s_hv_page_fault(run, vcpu,
				vcpu->arch.fault_dar, vcpu->arch.fault_dsisr);
			srcu_read_unlock(&vcpu->kvm->srcu, srcu_idx);
2269
		}
2270
	} while (is_kvmppc_resume_guest(r));
2271 2272

 out:
2273
	vcpu->arch.state = KVMPPC_VCPU_NOTREADY;
2274
	atomic_dec(&vcpu->kvm->arch.vcpus_running);
2275 2276 2277
	return r;
}

2278 2279 2280 2281 2282 2283 2284 2285 2286 2287
static void kvmppc_add_seg_page_size(struct kvm_ppc_one_seg_page_size **sps,
				     int linux_psize)
{
	struct mmu_psize_def *def = &mmu_psize_defs[linux_psize];

	if (!def->shift)
		return;
	(*sps)->page_shift = def->shift;
	(*sps)->slb_enc = def->sllp;
	(*sps)->enc[0].page_shift = def->shift;
2288
	(*sps)->enc[0].pte_enc = def->penc[linux_psize];
2289 2290 2291 2292 2293 2294 2295
	/*
	 * Add 16MB MPSS support if host supports it
	 */
	if (linux_psize != MMU_PAGE_16M && def->penc[MMU_PAGE_16M] != -1) {
		(*sps)->enc[1].page_shift = 24;
		(*sps)->enc[1].pte_enc = def->penc[MMU_PAGE_16M];
	}
2296 2297 2298
	(*sps)++;
}

2299 2300
static int kvm_vm_ioctl_get_smmu_info_hv(struct kvm *kvm,
					 struct kvm_ppc_smmu_info *info)
2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317
{
	struct kvm_ppc_one_seg_page_size *sps;

	info->flags = KVM_PPC_PAGE_SIZES_REAL;
	if (mmu_has_feature(MMU_FTR_1T_SEGMENT))
		info->flags |= KVM_PPC_1T_SEGMENTS;
	info->slb_size = mmu_slb_size;

	/* We only support these sizes for now, and no muti-size segments */
	sps = &info->sps[0];
	kvmppc_add_seg_page_size(&sps, MMU_PAGE_4K);
	kvmppc_add_seg_page_size(&sps, MMU_PAGE_64K);
	kvmppc_add_seg_page_size(&sps, MMU_PAGE_16M);

	return 0;
}

2318 2319 2320
/*
 * Get (and clear) the dirty memory log for a memory slot.
 */
2321 2322
static int kvm_vm_ioctl_get_dirty_log_hv(struct kvm *kvm,
					 struct kvm_dirty_log *log)
2323 2324 2325 2326 2327 2328 2329 2330
{
	struct kvm_memory_slot *memslot;
	int r;
	unsigned long n;

	mutex_lock(&kvm->slots_lock);

	r = -EINVAL;
2331
	if (log->slot >= KVM_USER_MEM_SLOTS)
2332 2333 2334 2335 2336 2337 2338 2339 2340 2341
		goto out;

	memslot = id_to_memslot(kvm->memslots, log->slot);
	r = -ENOENT;
	if (!memslot->dirty_bitmap)
		goto out;

	n = kvm_dirty_bitmap_bytes(memslot);
	memset(memslot->dirty_bitmap, 0, n);

2342
	r = kvmppc_hv_get_dirty_log(kvm, memslot, memslot->dirty_bitmap);
2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355
	if (r)
		goto out;

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

	r = 0;
out:
	mutex_unlock(&kvm->slots_lock);
	return r;
}

2356 2357
static void kvmppc_core_free_memslot_hv(struct kvm_memory_slot *free,
					struct kvm_memory_slot *dont)
2358 2359 2360 2361
{
	if (!dont || free->arch.rmap != dont->arch.rmap) {
		vfree(free->arch.rmap);
		free->arch.rmap = NULL;
2362
	}
2363 2364
}

2365 2366
static int kvmppc_core_create_memslot_hv(struct kvm_memory_slot *slot,
					 unsigned long npages)
2367 2368 2369 2370
{
	slot->arch.rmap = vzalloc(npages * sizeof(*slot->arch.rmap));
	if (!slot->arch.rmap)
		return -ENOMEM;
2371

2372 2373
	return 0;
}
2374

2375 2376 2377
static int kvmppc_core_prepare_memory_region_hv(struct kvm *kvm,
					struct kvm_memory_slot *memslot,
					struct kvm_userspace_memory_region *mem)
2378
{
2379
	return 0;
2380 2381
}

2382 2383 2384
static void kvmppc_core_commit_memory_region_hv(struct kvm *kvm,
				struct kvm_userspace_memory_region *mem,
				const struct kvm_memory_slot *old)
2385
{
2386 2387 2388
	unsigned long npages = mem->memory_size >> PAGE_SHIFT;
	struct kvm_memory_slot *memslot;

2389
	if (npages && old->npages) {
2390 2391 2392 2393 2394 2395 2396 2397 2398
		/*
		 * If modifying a memslot, reset all the rmap dirty bits.
		 * If this is a new memslot, we don't need to do anything
		 * since the rmap array starts out as all zeroes,
		 * i.e. no pages are dirty.
		 */
		memslot = id_to_memslot(kvm->memslots, mem->slot);
		kvmppc_hv_get_dirty_log(kvm, memslot, NULL);
	}
2399 2400
}

2401 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
/*
 * Update LPCR values in kvm->arch and in vcores.
 * Caller must hold kvm->lock.
 */
void kvmppc_update_lpcr(struct kvm *kvm, unsigned long lpcr, unsigned long mask)
{
	long int i;
	u32 cores_done = 0;

	if ((kvm->arch.lpcr & mask) == lpcr)
		return;

	kvm->arch.lpcr = (kvm->arch.lpcr & ~mask) | lpcr;

	for (i = 0; i < KVM_MAX_VCORES; ++i) {
		struct kvmppc_vcore *vc = kvm->arch.vcores[i];
		if (!vc)
			continue;
		spin_lock(&vc->lock);
		vc->lpcr = (vc->lpcr & ~mask) | lpcr;
		spin_unlock(&vc->lock);
		if (++cores_done >= kvm->arch.online_vcores)
			break;
	}
}

2427 2428 2429 2430 2431
static void kvmppc_mmu_destroy_hv(struct kvm_vcpu *vcpu)
{
	return;
}

2432
static int kvmppc_hv_setup_htab_rma(struct kvm_vcpu *vcpu)
2433 2434 2435 2436 2437 2438
{
	int err = 0;
	struct kvm *kvm = vcpu->kvm;
	unsigned long hva;
	struct kvm_memory_slot *memslot;
	struct vm_area_struct *vma;
2439
	unsigned long lpcr = 0, senc;
2440
	unsigned long psize, porder;
2441
	int srcu_idx;
2442 2443

	mutex_lock(&kvm->lock);
2444
	if (kvm->arch.hpte_setup_done)
2445
		goto out;	/* another vcpu beat us to it */
2446

2447 2448 2449 2450 2451 2452 2453 2454 2455
	/* Allocate hashed page table (if not done already) and reset it */
	if (!kvm->arch.hpt_virt) {
		err = kvmppc_alloc_hpt(kvm, NULL);
		if (err) {
			pr_err("KVM: Couldn't alloc HPT\n");
			goto out;
		}
	}

2456
	/* Look up the memslot for guest physical address 0 */
2457
	srcu_idx = srcu_read_lock(&kvm->srcu);
2458
	memslot = gfn_to_memslot(kvm, 0);
2459

2460 2461 2462
	/* We must have some memory at 0 by now */
	err = -EINVAL;
	if (!memslot || (memslot->flags & KVM_MEMSLOT_INVALID))
2463
		goto out_srcu;
2464 2465 2466 2467 2468 2469 2470 2471 2472

	/* Look up the VMA for the start of this memory slot */
	hva = memslot->userspace_addr;
	down_read(&current->mm->mmap_sem);
	vma = find_vma(current->mm, hva);
	if (!vma || vma->vm_start > hva || (vma->vm_flags & VM_IO))
		goto up_out;

	psize = vma_kernel_pagesize(vma);
2473
	porder = __ilog2(psize);
2474 2475 2476

	up_read(&current->mm->mmap_sem);

2477 2478 2479 2480 2481
	/* We can handle 4k, 64k or 16M pages in the VRMA */
	err = -EINVAL;
	if (!(psize == 0x1000 || psize == 0x10000 ||
	      psize == 0x1000000))
		goto out_srcu;
2482

2483 2484 2485 2486 2487 2488
	/* Update VRMASD field in the LPCR */
	senc = slb_pgsize_encoding(psize);
	kvm->arch.vrma_slb_v = senc | SLB_VSID_B_1T |
		(VRMA_VSID << SLB_VSID_SHIFT_1T);
	/* the -4 is to account for senc values starting at 0x10 */
	lpcr = senc << (LPCR_VRMASD_SH - 4);
2489

2490 2491
	/* Create HPTEs in the hash page table for the VRMA */
	kvmppc_map_vrma(vcpu, memslot, porder);
2492

2493
	kvmppc_update_lpcr(kvm, lpcr, LPCR_VRMASD);
2494

2495
	/* Order updates to kvm->arch.lpcr etc. vs. hpte_setup_done */
2496
	smp_wmb();
2497
	kvm->arch.hpte_setup_done = 1;
2498
	err = 0;
2499 2500
 out_srcu:
	srcu_read_unlock(&kvm->srcu, srcu_idx);
2501 2502 2503
 out:
	mutex_unlock(&kvm->lock);
	return err;
2504

2505 2506
 up_out:
	up_read(&current->mm->mmap_sem);
2507
	goto out_srcu;
2508 2509
}

2510
static int kvmppc_core_init_vm_hv(struct kvm *kvm)
2511
{
2512
	unsigned long lpcr, lpid;
2513
	char buf[32];
2514

2515 2516 2517
	/* Allocate the guest's logical partition ID */

	lpid = kvmppc_alloc_lpid();
2518
	if ((long)lpid < 0)
2519 2520
		return -ENOMEM;
	kvm->arch.lpid = lpid;
2521

2522 2523 2524 2525 2526 2527 2528
	/*
	 * Since we don't flush the TLB when tearing down a VM,
	 * and this lpid might have previously been used,
	 * make sure we flush on each core before running the new VM.
	 */
	cpumask_setall(&kvm->arch.need_tlb_flush);

2529 2530 2531 2532
	/* Start out with the default set of hcalls enabled */
	memcpy(kvm->arch.enabled_hcalls, default_enabled_hcalls,
	       sizeof(kvm->arch.enabled_hcalls));

2533
	kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
2534

2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545
	/* Init LPCR for virtual RMA mode */
	kvm->arch.host_lpid = mfspr(SPRN_LPID);
	kvm->arch.host_lpcr = lpcr = mfspr(SPRN_LPCR);
	lpcr &= LPCR_PECE | LPCR_LPES;
	lpcr |= (4UL << LPCR_DPFD_SH) | LPCR_HDICE |
		LPCR_VPM0 | LPCR_VPM1;
	kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
		(VRMA_VSID << SLB_VSID_SHIFT_1T);
	/* On POWER8 turn on online bit to enable PURR/SPURR */
	if (cpu_has_feature(CPU_FTR_ARCH_207S))
		lpcr |= LPCR_ONL;
2546
	kvm->arch.lpcr = lpcr;
2547

2548
	/*
2549 2550
	 * Track that we now have a HV mode VM active. This blocks secondary
	 * CPU threads from coming online.
2551
	 */
2552
	kvm_hv_vm_activated();
2553

2554 2555 2556 2557 2558 2559 2560 2561
	/*
	 * Create a debugfs directory for the VM
	 */
	snprintf(buf, sizeof(buf), "vm%d", current->pid);
	kvm->arch.debugfs_dir = debugfs_create_dir(buf, kvm_debugfs_dir);
	if (!IS_ERR_OR_NULL(kvm->arch.debugfs_dir))
		kvmppc_mmu_debugfs_init(kvm);

2562
	return 0;
2563 2564
}

2565 2566 2567 2568
static void kvmppc_free_vcores(struct kvm *kvm)
{
	long int i;

2569 2570 2571 2572 2573 2574
	for (i = 0; i < KVM_MAX_VCORES; ++i) {
		if (kvm->arch.vcores[i] && kvm->arch.vcores[i]->mpp_buffer) {
			struct kvmppc_vcore *vc = kvm->arch.vcores[i];
			free_pages((unsigned long)vc->mpp_buffer,
				   MPP_BUFFER_ORDER);
		}
2575
		kfree(kvm->arch.vcores[i]);
2576
	}
2577 2578 2579
	kvm->arch.online_vcores = 0;
}

2580
static void kvmppc_core_destroy_vm_hv(struct kvm *kvm)
2581
{
2582 2583
	debugfs_remove_recursive(kvm->arch.debugfs_dir);

2584
	kvm_hv_vm_deactivated();
2585

2586
	kvmppc_free_vcores(kvm);
2587

2588 2589 2590
	kvmppc_free_hpt(kvm);
}

2591 2592 2593
/* We don't need to emulate any privileged instructions or dcbz */
static int kvmppc_core_emulate_op_hv(struct kvm_run *run, struct kvm_vcpu *vcpu,
				     unsigned int inst, int *advance)
2594
{
2595
	return EMULATE_FAIL;
2596 2597
}

2598 2599
static int kvmppc_core_emulate_mtspr_hv(struct kvm_vcpu *vcpu, int sprn,
					ulong spr_val)
2600 2601 2602 2603
{
	return EMULATE_FAIL;
}

2604 2605
static int kvmppc_core_emulate_mfspr_hv(struct kvm_vcpu *vcpu, int sprn,
					ulong *spr_val)
2606 2607 2608 2609
{
	return EMULATE_FAIL;
}

2610
static int kvmppc_core_check_processor_compat_hv(void)
2611
{
2612 2613
	if (!cpu_has_feature(CPU_FTR_HVMODE) ||
	    !cpu_has_feature(CPU_FTR_ARCH_206))
2614 2615
		return -EIO;
	return 0;
2616 2617
}

2618 2619 2620 2621 2622 2623 2624 2625 2626 2627 2628 2629 2630 2631 2632 2633 2634 2635 2636 2637 2638 2639 2640 2641 2642 2643 2644 2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659
static long kvm_arch_vm_ioctl_hv(struct file *filp,
				 unsigned int ioctl, unsigned long arg)
{
	struct kvm *kvm __maybe_unused = filp->private_data;
	void __user *argp = (void __user *)arg;
	long r;

	switch (ioctl) {

	case KVM_PPC_ALLOCATE_HTAB: {
		u32 htab_order;

		r = -EFAULT;
		if (get_user(htab_order, (u32 __user *)argp))
			break;
		r = kvmppc_alloc_reset_hpt(kvm, &htab_order);
		if (r)
			break;
		r = -EFAULT;
		if (put_user(htab_order, (u32 __user *)argp))
			break;
		r = 0;
		break;
	}

	case KVM_PPC_GET_HTAB_FD: {
		struct kvm_get_htab_fd ghf;

		r = -EFAULT;
		if (copy_from_user(&ghf, argp, sizeof(ghf)))
			break;
		r = kvm_vm_ioctl_get_htab_fd(kvm, &ghf);
		break;
	}

	default:
		r = -ENOTTY;
	}

	return r;
}

2660 2661 2662 2663 2664 2665 2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693
/*
 * List of hcall numbers to enable by default.
 * For compatibility with old userspace, we enable by default
 * all hcalls that were implemented before the hcall-enabling
 * facility was added.  Note this list should not include H_RTAS.
 */
static unsigned int default_hcall_list[] = {
	H_REMOVE,
	H_ENTER,
	H_READ,
	H_PROTECT,
	H_BULK_REMOVE,
	H_GET_TCE,
	H_PUT_TCE,
	H_SET_DABR,
	H_SET_XDABR,
	H_CEDE,
	H_PROD,
	H_CONFER,
	H_REGISTER_VPA,
#ifdef CONFIG_KVM_XICS
	H_EOI,
	H_CPPR,
	H_IPI,
	H_IPOLL,
	H_XIRR,
	H_XIRR_X,
#endif
	0
};

static void init_default_hcalls(void)
{
	int i;
2694
	unsigned int hcall;
2695

2696 2697 2698 2699 2700
	for (i = 0; default_hcall_list[i]; ++i) {
		hcall = default_hcall_list[i];
		WARN_ON(!kvmppc_hcall_impl_hv(hcall));
		__set_bit(hcall / 4, default_enabled_hcalls);
	}
2701 2702
}

2703
static struct kvmppc_ops kvm_ops_hv = {
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
	.get_sregs = kvm_arch_vcpu_ioctl_get_sregs_hv,
	.set_sregs = kvm_arch_vcpu_ioctl_set_sregs_hv,
	.get_one_reg = kvmppc_get_one_reg_hv,
	.set_one_reg = kvmppc_set_one_reg_hv,
	.vcpu_load   = kvmppc_core_vcpu_load_hv,
	.vcpu_put    = kvmppc_core_vcpu_put_hv,
	.set_msr     = kvmppc_set_msr_hv,
	.vcpu_run    = kvmppc_vcpu_run_hv,
	.vcpu_create = kvmppc_core_vcpu_create_hv,
	.vcpu_free   = kvmppc_core_vcpu_free_hv,
	.check_requests = kvmppc_core_check_requests_hv,
	.get_dirty_log  = kvm_vm_ioctl_get_dirty_log_hv,
	.flush_memslot  = kvmppc_core_flush_memslot_hv,
	.prepare_memory_region = kvmppc_core_prepare_memory_region_hv,
	.commit_memory_region  = kvmppc_core_commit_memory_region_hv,
	.unmap_hva = kvm_unmap_hva_hv,
	.unmap_hva_range = kvm_unmap_hva_range_hv,
	.age_hva  = kvm_age_hva_hv,
	.test_age_hva = kvm_test_age_hva_hv,
	.set_spte_hva = kvm_set_spte_hva_hv,
	.mmu_destroy  = kvmppc_mmu_destroy_hv,
	.free_memslot = kvmppc_core_free_memslot_hv,
	.create_memslot = kvmppc_core_create_memslot_hv,
	.init_vm =  kvmppc_core_init_vm_hv,
	.destroy_vm = kvmppc_core_destroy_vm_hv,
	.get_smmu_info = kvm_vm_ioctl_get_smmu_info_hv,
	.emulate_op = kvmppc_core_emulate_op_hv,
	.emulate_mtspr = kvmppc_core_emulate_mtspr_hv,
	.emulate_mfspr = kvmppc_core_emulate_mfspr_hv,
	.fast_vcpu_kick = kvmppc_fast_vcpu_kick_hv,
	.arch_vm_ioctl  = kvm_arch_vm_ioctl_hv,
2735
	.hcall_implemented = kvmppc_hcall_impl_hv,
2736 2737 2738
};

static int kvmppc_book3s_init_hv(void)
2739 2740
{
	int r;
2741 2742 2743 2744 2745
	/*
	 * FIXME!! Do we need to check on all cpus ?
	 */
	r = kvmppc_core_check_processor_compat_hv();
	if (r < 0)
2746
		return -ENODEV;
2747

2748 2749
	kvm_ops_hv.owner = THIS_MODULE;
	kvmppc_hv_ops = &kvm_ops_hv;
2750

2751 2752
	init_default_hcalls();

2753
	r = kvmppc_mmu_hv_init();
2754 2755 2756
	return r;
}

2757
static void kvmppc_book3s_exit_hv(void)
2758
{
2759
	kvmppc_hv_ops = NULL;
2760 2761
}

2762 2763
module_init(kvmppc_book3s_init_hv);
module_exit(kvmppc_book3s_exit_hv);
2764
MODULE_LICENSE("GPL");
2765 2766
MODULE_ALIAS_MISCDEV(KVM_MINOR);
MODULE_ALIAS("devname:kvm");