vsie.c 27.6 KB
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/*
 * kvm nested virtualization support for s390x
 *
 * Copyright IBM Corp. 2016
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License (version 2 only)
 * as published by the Free Software Foundation.
 *
 *    Author(s): David Hildenbrand <dahi@linux.vnet.ibm.com>
 */
#include <linux/vmalloc.h>
#include <linux/kvm_host.h>
#include <linux/bug.h>
#include <linux/list.h>
#include <linux/bitmap.h>
#include <asm/gmap.h>
#include <asm/mmu_context.h>
#include <asm/sclp.h>
#include <asm/nmi.h>
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#include <asm/dis.h>
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#include "kvm-s390.h"
#include "gaccess.h"

struct vsie_page {
	struct kvm_s390_sie_block scb_s;	/* 0x0000 */
	/* the pinned originial scb */
	struct kvm_s390_sie_block *scb_o;	/* 0x0200 */
	/* the shadow gmap in use by the vsie_page */
	struct gmap *gmap;			/* 0x0208 */
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	__u8 reserved[0x0700 - 0x0210];		/* 0x0210 */
	struct kvm_s390_crypto_cb crycb;	/* 0x0700 */
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	__u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE];	/* 0x0800 */
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} __packed;

/* trigger a validity icpt for the given scb */
static int set_validity_icpt(struct kvm_s390_sie_block *scb,
			     __u16 reason_code)
{
	scb->ipa = 0x1000;
	scb->ipb = ((__u32) reason_code) << 16;
	scb->icptcode = ICPT_VALIDITY;
	return 1;
}

/* mark the prefix as unmapped, this will block the VSIE */
static void prefix_unmapped(struct vsie_page *vsie_page)
{
	atomic_or(PROG_REQUEST, &vsie_page->scb_s.prog20);
}

/* mark the prefix as unmapped and wait until the VSIE has been left */
static void prefix_unmapped_sync(struct vsie_page *vsie_page)
{
	prefix_unmapped(vsie_page);
	if (vsie_page->scb_s.prog0c & PROG_IN_SIE)
		atomic_or(CPUSTAT_STOP_INT, &vsie_page->scb_s.cpuflags);
	while (vsie_page->scb_s.prog0c & PROG_IN_SIE)
		cpu_relax();
}

/* mark the prefix as mapped, this will allow the VSIE to run */
static void prefix_mapped(struct vsie_page *vsie_page)
{
	atomic_andnot(PROG_REQUEST, &vsie_page->scb_s.prog20);
}

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/* test if the prefix is mapped into the gmap shadow */
static int prefix_is_mapped(struct vsie_page *vsie_page)
{
	return !(atomic_read(&vsie_page->scb_s.prog20) & PROG_REQUEST);
}
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/* copy the updated intervention request bits into the shadow scb */
static void update_intervention_requests(struct vsie_page *vsie_page)
{
	const int bits = CPUSTAT_STOP_INT | CPUSTAT_IO_INT | CPUSTAT_EXT_INT;
	int cpuflags;

	cpuflags = atomic_read(&vsie_page->scb_o->cpuflags);
	atomic_andnot(bits, &vsie_page->scb_s.cpuflags);
	atomic_or(cpuflags & bits, &vsie_page->scb_s.cpuflags);
}

/* shadow (filter and validate) the cpuflags  */
static int prepare_cpuflags(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
	int newflags, cpuflags = atomic_read(&scb_o->cpuflags);

	/* we don't allow ESA/390 guests */
	if (!(cpuflags & CPUSTAT_ZARCH))
		return set_validity_icpt(scb_s, 0x0001U);

	if (cpuflags & (CPUSTAT_RRF | CPUSTAT_MCDS))
		return set_validity_icpt(scb_s, 0x0001U);
	else if (cpuflags & (CPUSTAT_SLSV | CPUSTAT_SLSR))
		return set_validity_icpt(scb_s, 0x0007U);

	/* intervention requests will be set later */
	newflags = CPUSTAT_ZARCH;
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	if (cpuflags & CPUSTAT_GED && test_kvm_facility(vcpu->kvm, 8))
		newflags |= CPUSTAT_GED;
	if (cpuflags & CPUSTAT_GED2 && test_kvm_facility(vcpu->kvm, 78)) {
		if (cpuflags & CPUSTAT_GED)
			return set_validity_icpt(scb_s, 0x0001U);
		newflags |= CPUSTAT_GED2;
	}
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	atomic_set(&scb_s->cpuflags, newflags);
	return 0;
}

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/*
 * Create a shadow copy of the crycb block and setup key wrapping, if
 * requested for guest 3 and enabled for guest 2.
 *
 * We only accept format-1 (no AP in g2), but convert it into format-2
 * There is nothing to do for format-0.
 *
 * Returns: - 0 if shadowed or nothing to do
 *          - > 0 if control has to be given to guest 2
 */
static int shadow_crycb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
	u32 crycb_addr = scb_o->crycbd & 0x7ffffff8U;
	unsigned long *b1, *b2;
	u8 ecb3_flags;

	scb_s->crycbd = 0;
	if (!(scb_o->crycbd & vcpu->arch.sie_block->crycbd & CRYCB_FORMAT1))
		return 0;
	/* format-1 is supported with message-security-assist extension 3 */
	if (!test_kvm_facility(vcpu->kvm, 76))
		return 0;
	/* we may only allow it if enabled for guest 2 */
	ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 &
		     (ECB3_AES | ECB3_DEA);
	if (!ecb3_flags)
		return 0;

	if ((crycb_addr & PAGE_MASK) != ((crycb_addr + 128) & PAGE_MASK))
		return set_validity_icpt(scb_s, 0x003CU);
	else if (!crycb_addr)
		return set_validity_icpt(scb_s, 0x0039U);

	/* copy only the wrapping keys */
	if (read_guest_real(vcpu, crycb_addr + 72, &vsie_page->crycb, 56))
		return set_validity_icpt(scb_s, 0x0035U);

	scb_s->ecb3 |= ecb3_flags;
	scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT1 |
			CRYCB_FORMAT2;

	/* xor both blocks in one run */
	b1 = (unsigned long *) vsie_page->crycb.dea_wrapping_key_mask;
	b2 = (unsigned long *)
			    vcpu->kvm->arch.crypto.crycb->dea_wrapping_key_mask;
	/* as 56%8 == 0, bitmap_xor won't overwrite any data */
	bitmap_xor(b1, b1, b2, BITS_PER_BYTE * 56);
	return 0;
}

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/* shadow (round up/down) the ibc to avoid validity icpt */
static void prepare_ibc(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
	__u64 min_ibc = (sclp.ibc >> 16) & 0x0fffU;

	scb_s->ibc = 0;
	/* ibc installed in g2 and requested for g3 */
	if (vcpu->kvm->arch.model.ibc && (scb_o->ibc & 0x0fffU)) {
		scb_s->ibc = scb_o->ibc & 0x0fffU;
		/* takte care of the minimum ibc level of the machine */
		if (scb_s->ibc < min_ibc)
			scb_s->ibc = min_ibc;
		/* take care of the maximum ibc level set for the guest */
		if (scb_s->ibc > vcpu->kvm->arch.model.ibc)
			scb_s->ibc = vcpu->kvm->arch.model.ibc;
	}
}

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/* unshadow the scb, copying parameters back to the real scb */
static void unshadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;

	/* interception */
	scb_o->icptcode = scb_s->icptcode;
	scb_o->icptstatus = scb_s->icptstatus;
	scb_o->ipa = scb_s->ipa;
	scb_o->ipb = scb_s->ipb;
	scb_o->gbea = scb_s->gbea;

	/* timer */
	scb_o->cputm = scb_s->cputm;
	scb_o->ckc = scb_s->ckc;
	scb_o->todpr = scb_s->todpr;

	/* guest state */
	scb_o->gpsw = scb_s->gpsw;
	scb_o->gg14 = scb_s->gg14;
	scb_o->gg15 = scb_s->gg15;
	memcpy(scb_o->gcr, scb_s->gcr, 128);
	scb_o->pp = scb_s->pp;

	/* interrupt intercept */
	switch (scb_s->icptcode) {
	case ICPT_PROGI:
	case ICPT_INSTPROGI:
	case ICPT_EXTINT:
		memcpy((void *)((u64)scb_o + 0xc0),
		       (void *)((u64)scb_s + 0xc0), 0xf0 - 0xc0);
		break;
	case ICPT_PARTEXEC:
		/* MVPG only */
		memcpy((void *)((u64)scb_o + 0xc0),
		       (void *)((u64)scb_s + 0xc0), 0xd0 - 0xc0);
		break;
	}

	if (scb_s->ihcpu != 0xffffU)
		scb_o->ihcpu = scb_s->ihcpu;
}

/*
 * Setup the shadow scb by copying and checking the relevant parts of the g2
 * provided scb.
 *
 * Returns: - 0 if the scb has been shadowed
 *          - > 0 if control has to be given to guest 2
 */
static int shadow_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
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	bool had_tx = scb_s->ecb & 0x10U;
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	unsigned long new_mso;
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	int rc;

	/* make sure we don't have any leftovers when reusing the scb */
	scb_s->icptcode = 0;
	scb_s->eca = 0;
	scb_s->ecb = 0;
	scb_s->ecb2 = 0;
	scb_s->ecb3 = 0;
	scb_s->ecd = 0;
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	scb_s->fac = 0;
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	rc = prepare_cpuflags(vcpu, vsie_page);
	if (rc)
		goto out;

	/* timer */
	scb_s->cputm = scb_o->cputm;
	scb_s->ckc = scb_o->ckc;
	scb_s->todpr = scb_o->todpr;
	scb_s->epoch = scb_o->epoch;

	/* guest state */
	scb_s->gpsw = scb_o->gpsw;
	scb_s->gg14 = scb_o->gg14;
	scb_s->gg15 = scb_o->gg15;
	memcpy(scb_s->gcr, scb_o->gcr, 128);
	scb_s->pp = scb_o->pp;

	/* interception / execution handling */
	scb_s->gbea = scb_o->gbea;
	scb_s->lctl = scb_o->lctl;
	scb_s->svcc = scb_o->svcc;
	scb_s->ictl = scb_o->ictl;
	/*
	 * SKEY handling functions can't deal with false setting of PTE invalid
	 * bits. Therefore we cannot provide interpretation and would later
	 * have to provide own emulation handlers.
	 */
	scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;
	scb_s->icpua = scb_o->icpua;

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	new_mso = scb_o->mso & 0xfffffffffff00000UL;
	/* if the hva of the prefix changes, we have to remap the prefix */
	if (scb_s->mso != new_mso || scb_s->prefix != scb_o->prefix)
		prefix_unmapped(vsie_page);
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	 /* SIE will do mso/msl validity and exception checks for us */
	scb_s->msl = scb_o->msl & 0xfffffffffff00000UL;
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	scb_s->mso = new_mso;
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	scb_s->prefix = scb_o->prefix;

	/* We have to definetly flush the tlb if this scb never ran */
	if (scb_s->ihcpu != 0xffffU)
		scb_s->ihcpu = scb_o->ihcpu;

	/* MVPG and Protection Exception Interpretation are always available */
	scb_s->eca |= scb_o->eca & 0x01002000U;
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	/* Host-protection-interruption introduced with ESOP */
	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP))
		scb_s->ecb |= scb_o->ecb & 0x02U;
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	/* transactional execution */
	if (test_kvm_facility(vcpu->kvm, 73)) {
		/* remap the prefix is tx is toggled on */
		if ((scb_o->ecb & 0x10U) && !had_tx)
			prefix_unmapped(vsie_page);
		scb_s->ecb |= scb_o->ecb & 0x10U;
	}
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	/* SIMD */
	if (test_kvm_facility(vcpu->kvm, 129)) {
		scb_s->eca |= scb_o->eca & 0x00020000U;
		scb_s->ecd |= scb_o->ecd & 0x20000000U;
	}
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	/* Run-time-Instrumentation */
	if (test_kvm_facility(vcpu->kvm, 64))
		scb_s->ecb3 |= scb_o->ecb3 & 0x01U;
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	prepare_ibc(vcpu, vsie_page);
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	rc = shadow_crycb(vcpu, vsie_page);
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out:
	if (rc)
		unshadow_scb(vcpu, vsie_page);
	return rc;
}

void kvm_s390_vsie_gmap_notifier(struct gmap *gmap, unsigned long start,
				 unsigned long end)
{
	struct kvm *kvm = gmap->private;
	struct vsie_page *cur;
	unsigned long prefix;
	struct page *page;
	int i;

	if (!gmap_is_shadow(gmap))
		return;
	if (start >= 1UL << 31)
		/* We are only interested in prefix pages */
		return;

	/*
	 * Only new shadow blocks are added to the list during runtime,
	 * therefore we can safely reference them all the time.
	 */
	for (i = 0; i < kvm->arch.vsie.page_count; i++) {
		page = READ_ONCE(kvm->arch.vsie.pages[i]);
		if (!page)
			continue;
		cur = page_to_virt(page);
		if (READ_ONCE(cur->gmap) != gmap)
			continue;
		prefix = cur->scb_s.prefix << GUEST_PREFIX_SHIFT;
		/* with mso/msl, the prefix lies at an offset */
		prefix += cur->scb_s.mso;
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		if (prefix <= end && start <= prefix + 2 * PAGE_SIZE - 1)
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			prefix_unmapped_sync(cur);
	}
}

/*
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 * Map the first prefix page and if tx is enabled also the second prefix page.
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 *
 * The prefix will be protected, a gmap notifier will inform about unmaps.
 * The shadow scb must not be executed until the prefix is remapped, this is
 * guaranteed by properly handling PROG_REQUEST.
 *
 * Returns: - 0 on if successfully mapped or already mapped
 *          - > 0 if control has to be given to guest 2
 *          - -EAGAIN if the caller can retry immediately
 *          - -ENOMEM if out of memory
 */
static int map_prefix(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	u64 prefix = scb_s->prefix << GUEST_PREFIX_SHIFT;
	int rc;

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	if (prefix_is_mapped(vsie_page))
		return 0;

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	/* mark it as mapped so we can catch any concurrent unmappers */
	prefix_mapped(vsie_page);

	/* with mso/msl, the prefix lies at offset *mso* */
	prefix += scb_s->mso;

	rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, prefix);
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	if (!rc && (scb_s->ecb & 0x10U))
		rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
					   prefix + PAGE_SIZE);
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	/*
	 * We don't have to mprotect, we will be called for all unshadows.
	 * SIE will detect if protection applies and trigger a validity.
	 */
	if (rc)
		prefix_unmapped(vsie_page);
	if (rc > 0 || rc == -EFAULT)
		rc = set_validity_icpt(scb_s, 0x0037U);
	return rc;
}

/*
 * Pin the guest page given by gpa and set hpa to the pinned host address.
 * Will always be pinned writable.
 *
 * Returns: - 0 on success
 *          - -EINVAL if the gpa is not valid guest storage
 *          - -ENOMEM if out of memory
 */
static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa)
{
	struct page *page;
	hva_t hva;
	int rc;

	hva = gfn_to_hva(kvm, gpa_to_gfn(gpa));
	if (kvm_is_error_hva(hva))
		return -EINVAL;
	rc = get_user_pages_fast(hva, 1, 1, &page);
	if (rc < 0)
		return rc;
	else if (rc != 1)
		return -ENOMEM;
	*hpa = (hpa_t) page_to_virt(page) + (gpa & ~PAGE_MASK);
	return 0;
}

/* Unpins a page previously pinned via pin_guest_page, marking it as dirty. */
static void unpin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t hpa)
{
	struct page *page;

	page = virt_to_page(hpa);
	set_page_dirty_lock(page);
	put_page(page);
	/* mark the page always as dirty for migration */
	mark_page_dirty(kvm, gpa_to_gfn(gpa));
}

/* unpin all blocks previously pinned by pin_blocks(), marking them dirty */
static void unpin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	hpa_t hpa;
	gpa_t gpa;

	hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol;
	if (hpa) {
		gpa = scb_o->scaol & ~0xfUL;
		unpin_guest_page(vcpu->kvm, gpa, hpa);
		scb_s->scaol = 0;
		scb_s->scaoh = 0;
	}
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	hpa = scb_s->itdba;
	if (hpa) {
		gpa = scb_o->itdba & ~0xffUL;
		unpin_guest_page(vcpu->kvm, gpa, hpa);
		scb_s->itdba = 0;
	}
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	hpa = scb_s->gvrd;
	if (hpa) {
		gpa = scb_o->gvrd & ~0x1ffUL;
		unpin_guest_page(vcpu->kvm, gpa, hpa);
		scb_s->gvrd = 0;
	}
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	hpa = scb_s->riccbd;
	if (hpa) {
		gpa = scb_o->riccbd & ~0x3fUL;
		unpin_guest_page(vcpu->kvm, gpa, hpa);
		scb_s->riccbd = 0;
	}
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}

/*
 * Instead of shadowing some blocks, we can simply forward them because the
 * addresses in the scb are 64 bit long.
 *
 * This works as long as the data lies in one page. If blocks ever exceed one
 * page, we have to fall back to shadowing.
 *
 * As we reuse the sca, the vcpu pointers contained in it are invalid. We must
 * therefore not enable any facilities that access these pointers (e.g. SIGPIF).
 *
 * Returns: - 0 if all blocks were pinned.
 *          - > 0 if control has to be given to guest 2
 *          - -ENOMEM if out of memory
 */
static int pin_blocks(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	hpa_t hpa;
	gpa_t gpa;
	int rc = 0;

	gpa = scb_o->scaol & ~0xfUL;
	if (gpa) {
		if (!(gpa & ~0x1fffUL))
			rc = set_validity_icpt(scb_s, 0x0038U);
		else if ((gpa & ~0x1fffUL) == kvm_s390_get_prefix(vcpu))
			rc = set_validity_icpt(scb_s, 0x0011U);
		else if ((gpa & PAGE_MASK) !=
			 ((gpa + sizeof(struct bsca_block) - 1) & PAGE_MASK))
			rc = set_validity_icpt(scb_s, 0x003bU);
		if (!rc) {
			rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
			if (rc == -EINVAL)
				rc = set_validity_icpt(scb_s, 0x0034U);
		}
		if (rc)
			goto unpin;
		scb_s->scaoh = (u32)((u64)hpa >> 32);
		scb_s->scaol = (u32)(u64)hpa;
	}
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	gpa = scb_o->itdba & ~0xffUL;
	if (gpa && (scb_s->ecb & 0x10U)) {
		if (!(gpa & ~0x1fffU)) {
			rc = set_validity_icpt(scb_s, 0x0080U);
			goto unpin;
		}
		/* 256 bytes cannot cross page boundaries */
		rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
		if (rc == -EINVAL)
			rc = set_validity_icpt(scb_s, 0x0080U);
		if (rc)
			goto unpin;
		scb_s->itdba = hpa;
	}
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	gpa = scb_o->gvrd & ~0x1ffUL;
	if (gpa && (scb_s->eca & 0x00020000U) &&
	    !(scb_s->ecd & 0x20000000U)) {
		if (!(gpa & ~0x1fffUL)) {
			rc = set_validity_icpt(scb_s, 0x1310U);
			goto unpin;
		}
		/*
		 * 512 bytes vector registers cannot cross page boundaries
		 * if this block gets bigger, we have to shadow it.
		 */
		rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
		if (rc == -EINVAL)
			rc = set_validity_icpt(scb_s, 0x1310U);
		if (rc)
			goto unpin;
		scb_s->gvrd = hpa;
	}
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569

	gpa = scb_o->riccbd & ~0x3fUL;
	if (gpa && (scb_s->ecb3 & 0x01U)) {
		if (!(gpa & ~0x1fffUL)) {
			rc = set_validity_icpt(scb_s, 0x0043U);
			goto unpin;
		}
		/* 64 bytes cannot cross page boundaries */
		rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
		if (rc == -EINVAL)
			rc = set_validity_icpt(scb_s, 0x0043U);
		/* Validity 0x0044 will be checked by SIE */
		if (rc)
			goto unpin;
		scb_s->gvrd = hpa;
	}
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	return 0;
unpin:
	unpin_blocks(vcpu, vsie_page);
	return rc;
}

/* unpin the scb provided by guest 2, marking it as dirty */
static void unpin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
		      gpa_t gpa)
{
	hpa_t hpa = (hpa_t) vsie_page->scb_o;

	if (hpa)
		unpin_guest_page(vcpu->kvm, gpa, hpa);
	vsie_page->scb_o = NULL;
}

/*
 * Pin the scb at gpa provided by guest 2 at vsie_page->scb_o.
 *
 * Returns: - 0 if the scb was pinned.
 *          - > 0 if control has to be given to guest 2
 *          - -ENOMEM if out of memory
 */
static int pin_scb(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page,
		   gpa_t gpa)
{
	hpa_t hpa;
	int rc;

	rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
	if (rc == -EINVAL) {
		rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
		if (!rc)
			rc = 1;
	}
	if (!rc)
		vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa;
	return rc;
}

/*
 * Inject a fault into guest 2.
 *
 * Returns: - > 0 if control has to be given to guest 2
 *            < 0 if an error occurred during injection.
 */
static int inject_fault(struct kvm_vcpu *vcpu, __u16 code, __u64 vaddr,
			bool write_flag)
{
	struct kvm_s390_pgm_info pgm = {
		.code = code,
		.trans_exc_code =
			/* 0-51: virtual address */
			(vaddr & 0xfffffffffffff000UL) |
			/* 52-53: store / fetch */
			(((unsigned int) !write_flag) + 1) << 10,
			/* 62-63: asce id (alway primary == 0) */
		.exc_access_id = 0, /* always primary */
		.op_access_id = 0, /* not MVPG */
	};
	int rc;

	if (code == PGM_PROTECTION)
		pgm.trans_exc_code |= 0x4UL;

	rc = kvm_s390_inject_prog_irq(vcpu, &pgm);
	return rc ? rc : 1;
}

/*
 * Handle a fault during vsie execution on a gmap shadow.
 *
 * Returns: - 0 if the fault was resolved
 *          - > 0 if control has to be given to guest 2
 *          - < 0 if an error occurred
 */
static int handle_fault(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	int rc;

	if (current->thread.gmap_int_code == PGM_PROTECTION)
		/* we can directly forward all protection exceptions */
		return inject_fault(vcpu, PGM_PROTECTION,
				    current->thread.gmap_addr, 1);

	rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
				   current->thread.gmap_addr);
	if (rc > 0) {
		rc = inject_fault(vcpu, rc,
				  current->thread.gmap_addr,
				  current->thread.gmap_write_flag);
	}
	return rc;
}

static inline void clear_vsie_icpt(struct vsie_page *vsie_page)
{
	vsie_page->scb_s.icptcode = 0;
}

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/* rewind the psw and clear the vsie icpt, so we can retry execution */
static void retry_vsie_icpt(struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	int ilen = insn_length(scb_s->ipa >> 8);

	/* take care of EXECUTE instructions */
	if (scb_s->icptstatus & 1) {
		ilen = (scb_s->icptstatus >> 4) & 0x6;
		if (!ilen)
			ilen = 4;
	}
	scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, ilen);
	clear_vsie_icpt(vsie_page);
}

/*
 * Try to shadow + enable the guest 2 provided facility list.
 * Retry instruction execution if enabled for and provided by guest 2.
 *
 * Returns: - 0 if handled (retry or guest 2 icpt)
 *          - > 0 if control has to be given to guest 2
 */
static int handle_stfle(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	__u32 fac = vsie_page->scb_o->fac & 0x7ffffff8U;

	if (fac && test_kvm_facility(vcpu->kvm, 7)) {
		retry_vsie_icpt(vsie_page);
		if (read_guest_real(vcpu, fac, &vsie_page->fac,
				    sizeof(vsie_page->fac)))
			return set_validity_icpt(scb_s, 0x1090U);
		scb_s->fac = (__u32)(__u64) &vsie_page->fac;
	}
	return 0;
}

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/*
 * Run the vsie on a shadow scb and a shadow gmap, without any further
 * sanity checks, handling SIE faults.
 *
 * Returns: - 0 everything went fine
 *          - > 0 if control has to be given to guest 2
 *          - < 0 if an error occurred
 */
static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;
	int rc;

	if (need_resched())
		schedule();
	if (test_cpu_flag(CIF_MCCK_PENDING))
		s390_handle_mcck();

	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
	local_irq_disable();
	kvm_guest_enter();
	local_irq_enable();

	rc = sie64a(scb_s, vcpu->run->s.regs.gprs);

	local_irq_disable();
	kvm_guest_exit();
	local_irq_enable();
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

	if (rc > 0)
		rc = 0; /* we could still have an icpt */
	else if (rc == -EFAULT)
		return handle_fault(vcpu, vsie_page);

	switch (scb_s->icptcode) {
746 747 748 749
	case ICPT_INST:
		if (scb_s->ipa == 0xb2b0)
			rc = handle_stfle(vcpu, vsie_page);
		break;
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	case ICPT_STOP:
		/* stop not requested by g2 - must have been a kick */
		if (!(atomic_read(&scb_o->cpuflags) & CPUSTAT_STOP_INT))
			clear_vsie_icpt(vsie_page);
		break;
	case ICPT_VALIDITY:
		if ((scb_s->ipa & 0xf000) != 0xf000)
			scb_s->ipa += 0x1000;
		break;
	}
	return rc;
}

static void release_gmap_shadow(struct vsie_page *vsie_page)
{
	if (vsie_page->gmap)
		gmap_put(vsie_page->gmap);
	WRITE_ONCE(vsie_page->gmap, NULL);
768
	prefix_unmapped(vsie_page);
769 770 771 772 773 774 775 776 777 778 779 780 781 782 783
}

static int acquire_gmap_shadow(struct kvm_vcpu *vcpu,
			       struct vsie_page *vsie_page)
{
	unsigned long asce;
	union ctlreg0 cr0;
	struct gmap *gmap;
	int edat;

	asce = vcpu->arch.sie_block->gcr[1];
	cr0.val = vcpu->arch.sie_block->gcr[0];
	edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8);
	edat += edat && test_kvm_facility(vcpu->kvm, 78);

784 785 786 787 788 789 790 791 792 793
	/*
	 * ASCE or EDAT could have changed since last icpt, or the gmap
	 * we're holding has been unshadowed. If the gmap is still valid,
	 * we can safely reuse it.
	 */
	if (vsie_page->gmap && gmap_shadow_valid(vsie_page->gmap, asce, edat))
		return 0;

	/* release the old shadow - if any, and mark the prefix as unmapped */
	release_gmap_shadow(vsie_page);
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	gmap = gmap_shadow(vcpu->arch.gmap, asce, edat);
	if (IS_ERR(gmap))
		return PTR_ERR(gmap);
	gmap->private = vcpu->kvm;
	WRITE_ONCE(vsie_page->gmap, gmap);
	return 0;
}

/*
 * Run the vsie on a shadowed scb, managing the gmap shadow, handling
 * prefix pages and faults.
 *
 * Returns: - 0 if no errors occurred
 *          - > 0 if control has to be given to guest 2
 *          - -ENOMEM if out of memory
 */
static int vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page)
{
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;
	int rc = 0;

	while (1) {
		rc = acquire_gmap_shadow(vcpu, vsie_page);
		if (!rc)
			rc = map_prefix(vcpu, vsie_page);
		if (!rc) {
			gmap_enable(vsie_page->gmap);
			update_intervention_requests(vsie_page);
			rc = do_vsie_run(vcpu, vsie_page);
			gmap_enable(vcpu->arch.gmap);
		}

		if (rc == -EAGAIN)
			rc = 0;
		if (rc || scb_s->icptcode || signal_pending(current) ||
		    kvm_s390_vcpu_has_irq(vcpu, 0))
			break;
	};

	if (rc == -EFAULT) {
		/*
		 * Addressing exceptions are always presentes as intercepts.
		 * As addressing exceptions are suppressing and our guest 3 PSW
		 * points at the responsible instruction, we have to
		 * forward the PSW and set the ilc. If we can't read guest 3
		 * instruction, we can use an arbitrary ilc. Let's always use
		 * ilen = 4 for now, so we can avoid reading in guest 3 virtual
		 * memory. (we could also fake the shadow so the hardware
		 * handles it).
		 */
		scb_s->icptcode = ICPT_PROGI;
		scb_s->iprcc = PGM_ADDRESSING;
		scb_s->pgmilc = 4;
		scb_s->gpsw.addr = __rewind_psw(scb_s->gpsw, 4);
	}
	return rc;
}

/*
 * Get or create a vsie page for a scb address.
 *
 * Returns: - address of a vsie page (cached or new one)
 *          - NULL if the same scb address is already used by another VCPU
 *          - ERR_PTR(-ENOMEM) if out of memory
 */
static struct vsie_page *get_vsie_page(struct kvm *kvm, unsigned long addr)
{
	struct vsie_page *vsie_page;
	struct page *page;
	int nr_vcpus;

	rcu_read_lock();
	page = radix_tree_lookup(&kvm->arch.vsie.addr_to_page, addr >> 9);
	rcu_read_unlock();
	if (page) {
		if (page_ref_inc_return(page) == 2)
			return page_to_virt(page);
		page_ref_dec(page);
	}

	/*
	 * We want at least #online_vcpus shadows, so every VCPU can execute
	 * the VSIE in parallel.
	 */
	nr_vcpus = atomic_read(&kvm->online_vcpus);

	mutex_lock(&kvm->arch.vsie.mutex);
	if (kvm->arch.vsie.page_count < nr_vcpus) {
882
		page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA);
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
		if (!page) {
			mutex_unlock(&kvm->arch.vsie.mutex);
			return ERR_PTR(-ENOMEM);
		}
		page_ref_inc(page);
		kvm->arch.vsie.pages[kvm->arch.vsie.page_count] = page;
		kvm->arch.vsie.page_count++;
	} else {
		/* reuse an existing entry that belongs to nobody */
		while (true) {
			page = kvm->arch.vsie.pages[kvm->arch.vsie.next];
			if (page_ref_inc_return(page) == 2)
				break;
			page_ref_dec(page);
			kvm->arch.vsie.next++;
			kvm->arch.vsie.next %= nr_vcpus;
		}
		radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9);
	}
	page->index = addr;
	/* double use of the same address */
	if (radix_tree_insert(&kvm->arch.vsie.addr_to_page, addr >> 9, page)) {
		page_ref_dec(page);
		mutex_unlock(&kvm->arch.vsie.mutex);
		return NULL;
	}
	mutex_unlock(&kvm->arch.vsie.mutex);

	vsie_page = page_to_virt(page);
	memset(&vsie_page->scb_s, 0, sizeof(struct kvm_s390_sie_block));
913
	release_gmap_shadow(vsie_page);
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	vsie_page->scb_s.ihcpu = 0xffffU;
	return vsie_page;
}

/* put a vsie page acquired via get_vsie_page */
static void put_vsie_page(struct kvm *kvm, struct vsie_page *vsie_page)
{
	struct page *page = pfn_to_page(__pa(vsie_page) >> PAGE_SHIFT);

	page_ref_dec(page);
}

int kvm_s390_handle_vsie(struct kvm_vcpu *vcpu)
{
	struct vsie_page *vsie_page;
	unsigned long scb_addr;
	int rc;

	vcpu->stat.instruction_sie++;
	if (!test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIEF2))
		return -EOPNOTSUPP;
	if (vcpu->arch.sie_block->gpsw.mask & PSW_MASK_PSTATE)
		return kvm_s390_inject_program_int(vcpu, PGM_PRIVILEGED_OP);

	BUILD_BUG_ON(sizeof(struct vsie_page) != 4096);
	scb_addr = kvm_s390_get_base_disp_s(vcpu, NULL);

	/* 512 byte alignment */
	if (unlikely(scb_addr & 0x1ffUL))
		return kvm_s390_inject_program_int(vcpu, PGM_SPECIFICATION);

	if (signal_pending(current) || kvm_s390_vcpu_has_irq(vcpu, 0))
		return 0;

	vsie_page = get_vsie_page(vcpu->kvm, scb_addr);
	if (IS_ERR(vsie_page))
		return PTR_ERR(vsie_page);
	else if (!vsie_page)
		/* double use of sie control block - simply do nothing */
		return 0;

	rc = pin_scb(vcpu, vsie_page, scb_addr);
	if (rc)
		goto out_put;
	rc = shadow_scb(vcpu, vsie_page);
	if (rc)
		goto out_unpin_scb;
	rc = pin_blocks(vcpu, vsie_page);
	if (rc)
		goto out_unshadow;
	rc = vsie_run(vcpu, vsie_page);
	unpin_blocks(vcpu, vsie_page);
out_unshadow:
	unshadow_scb(vcpu, vsie_page);
out_unpin_scb:
	unpin_scb(vcpu, vsie_page, scb_addr);
out_put:
	put_vsie_page(vcpu->kvm, vsie_page);

	return rc < 0 ? rc : 0;
}

/* Init the vsie data structures. To be called when a vm is initialized. */
void kvm_s390_vsie_init(struct kvm *kvm)
{
	mutex_init(&kvm->arch.vsie.mutex);
	INIT_RADIX_TREE(&kvm->arch.vsie.addr_to_page, GFP_KERNEL);
}

/* Destroy the vsie data structures. To be called when a vm is destroyed. */
void kvm_s390_vsie_destroy(struct kvm *kvm)
{
986
	struct vsie_page *vsie_page;
987 988 989 990 991 992 993
	struct page *page;
	int i;

	mutex_lock(&kvm->arch.vsie.mutex);
	for (i = 0; i < kvm->arch.vsie.page_count; i++) {
		page = kvm->arch.vsie.pages[i];
		kvm->arch.vsie.pages[i] = NULL;
994 995
		vsie_page = page_to_virt(page);
		release_gmap_shadow(vsie_page);
996 997 998 999 1000 1001 1002
		/* free the radix tree entry */
		radix_tree_delete(&kvm->arch.vsie.addr_to_page, page->index >> 9);
		__free_page(page);
	}
	kvm->arch.vsie.page_count = 0;
	mutex_unlock(&kvm->arch.vsie.mutex);
}