vsie.c 32.2 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>
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#include <linux/sched/signal.h>

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#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 */
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	/*
	 * the backup info for machine check. ensure it's at
	 * the same offset as that in struct sie_page!
	 */
	struct mcck_volatile_info mcck_info;    /* 0x0200 */
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	/* the pinned originial scb */
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	struct kvm_s390_sie_block *scb_o;	/* 0x0218 */
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	/* the shadow gmap in use by the vsie_page */
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	struct gmap *gmap;			/* 0x0220 */
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	/* address of the last reported fault to guest2 */
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	unsigned long fault_addr;		/* 0x0228 */
	__u8 reserved[0x0700 - 0x0230];		/* 0x0230 */
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	struct kvm_s390_crypto_cb crycb;	/* 0x0700 */
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	__u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE];	/* 0x0800 */
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};
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/* 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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	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE))
		newflags |= cpuflags & CPUSTAT_P;
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	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GSLS))
		newflags |= cpuflags & CPUSTAT_SM;
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	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IBS))
		newflags |= cpuflags & CPUSTAT_IBS;
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	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_KSS))
		newflags |= cpuflags & CPUSTAT_KSS;
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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 & ECB_TE;
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	unsigned long new_mso = 0;
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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.
	 */
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	if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_KSS))
		scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE;

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	scb_s->icpua = scb_o->icpua;

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	if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM))
		new_mso = scb_o->mso & 0xfffffffffff00000UL;
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	/* 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 */
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	scb_s->eca |= scb_o->eca & (ECA_MVPGI | ECA_PROTEXCI);
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	/* Host-protection-interruption introduced with ESOP */
	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_ESOP))
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		scb_s->ecb |= scb_o->ecb & ECB_HOSTPROTINT;
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	/* transactional execution */
	if (test_kvm_facility(vcpu->kvm, 73)) {
		/* remap the prefix is tx is toggled on */
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		if ((scb_o->ecb & ECB_TE) && !had_tx)
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			prefix_unmapped(vsie_page);
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		scb_s->ecb |= scb_o->ecb & ECB_TE;
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	}
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	/* SIMD */
	if (test_kvm_facility(vcpu->kvm, 129)) {
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		scb_s->eca |= scb_o->eca & ECA_VX;
		scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT;
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	}
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	/* Run-time-Instrumentation */
	if (test_kvm_facility(vcpu->kvm, 64))
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		scb_s->ecb3 |= scb_o->ecb3 & ECB3_RI;
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	/* Instruction Execution Prevention */
	if (test_kvm_facility(vcpu->kvm, 130))
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		scb_s->ecb2 |= scb_o->ecb2 & ECB2_IEP;
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	/* Guarded Storage */
	if (test_kvm_facility(vcpu->kvm, 133)) {
		scb_s->ecb |= scb_o->ecb & ECB_GS;
		scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT;
	}
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	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF))
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		scb_s->eca |= scb_o->eca & ECA_SII;
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	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB))
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		scb_s->eca |= scb_o->eca & ECA_IB;
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	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI))
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		scb_s->eca |= scb_o->eca & ECA_CEI;
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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 & ECB_TE))
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		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;
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		if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
			gpa |= (u64) scb_o->scaoh << 32;
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		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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	hpa = scb_s->sdnxo;
	if (hpa) {
		gpa = scb_o->sdnxo;
		unpin_guest_page(vcpu->kvm, gpa, hpa);
		scb_s->sdnxo = 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;
545 546
	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
		gpa |= (u64) scb_o->scaoh << 32;
547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564
	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;
	}
565 566

	gpa = scb_o->itdba & ~0xffUL;
567
	if (gpa && (scb_s->ecb & ECB_TE)) {
568 569 570 571 572 573 574 575 576 577 578 579
		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;
	}
580 581

	gpa = scb_o->gvrd & ~0x1ffUL;
582
	if (gpa && (scb_s->eca & ECA_VX) && !(scb_s->ecd & ECD_HOSTREGMGMT)) {
583 584 585 586 587 588 589 590 591 592 593 594 595 596 597
		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;
	}
598 599

	gpa = scb_o->riccbd & ~0x3fUL;
600
	if (gpa && (scb_s->ecb3 & ECB3_RI)) {
601 602 603 604 605 606 607 608 609 610 611
		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;
D
David Hildenbrand 已提交
612
		scb_s->riccbd = hpa;
613
	}
F
Fan Zhang 已提交
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638
	if ((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) {
		unsigned long sdnxc;

		gpa = scb_o->sdnxo & ~0xfUL;
		sdnxc = scb_o->sdnxo & 0xfUL;
		if (!gpa || !(gpa & ~0x1fffUL)) {
			rc = set_validity_icpt(scb_s, 0x10b0U);
			goto unpin;
		}
		if (sdnxc < 6 || sdnxc > 12) {
			rc = set_validity_icpt(scb_s, 0x10b1U);
			goto unpin;
		}
		if (gpa & ((1 << sdnxc) - 1)) {
			rc = set_validity_icpt(scb_s, 0x10b2U);
			goto unpin;
		}
		/* Due to alignment rules (checked above) this cannot
		 * cross page boundaries
		 */
		rc = pin_guest_page(vcpu->kvm, gpa, &hpa);
		if (rc == -EINVAL)
			rc = set_validity_icpt(scb_s, 0x10b0U);
		if (rc)
			goto unpin;
639
		scb_s->sdnxo = hpa | sdnxc;
F
Fan Zhang 已提交
640
	}
641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732
	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);
733 734
		if (rc >= 0)
			vsie_page->fault_addr = current->thread.gmap_addr;
735 736 737 738
	}
	return rc;
}

739 740 741 742 743 744 745 746 747 748 749 750 751 752 753
/*
 * Retry the previous fault that required guest 2 intervention. This avoids
 * one superfluous SIE re-entry and direct exit.
 *
 * Will ignore any errors. The next SIE fault will do proper fault handling.
 */
static void handle_last_fault(struct kvm_vcpu *vcpu,
			      struct vsie_page *vsie_page)
{
	if (vsie_page->fault_addr)
		kvm_s390_shadow_fault(vcpu, vsie_page->gmap,
				      vsie_page->fault_addr);
	vsie_page->fault_addr = 0;
}

754 755 756 757 758
static inline void clear_vsie_icpt(struct vsie_page *vsie_page)
{
	vsie_page->scb_s.icptcode = 0;
}

759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796
/* 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;
}

797 798 799 800 801 802 803 804 805 806 807 808
/*
 * 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;
809 810
	struct mcck_volatile_info *mcck_info;
	struct sie_page *sie_page;
811 812
	int rc;

813 814
	handle_last_fault(vcpu, vsie_page);

815 816 817 818 819 820 821
	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();
822
	guest_enter_irqoff();
823 824 825 826 827
	local_irq_enable();

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

	local_irq_disable();
828
	guest_exit_irqoff();
829 830 831
	local_irq_enable();
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

832 833 834 835 836 837 838 839
	if (rc == -EINTR) {
		VCPU_EVENT(vcpu, 3, "%s", "machine check");
		sie_page = container_of(scb_s, struct sie_page, sie_block);
		mcck_info = &sie_page->mcck_info;
		kvm_s390_reinject_machine_check(vcpu, mcck_info);
		return 0;
	}

840 841 842 843 844 845
	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) {
846 847 848 849
	case ICPT_INST:
		if (scb_s->ipa == 0xb2b0)
			rc = handle_stfle(vcpu, vsie_page);
		break;
850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867
	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);
868
	prefix_unmapped(vsie_page);
869 870 871 872 873 874 875 876 877 878 879 880 881 882 883
}

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);

884 885 886 887 888 889 890 891 892 893
	/*
	 * 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);
894 895 896 897 898 899 900 901
	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;
}

902 903 904 905 906 907
/*
 * Register the shadow scb at the VCPU, e.g. for kicking out of vsie.
 */
static void register_shadow_scb(struct kvm_vcpu *vcpu,
				struct vsie_page *vsie_page)
{
908 909
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;

910
	WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s);
911 912 913 914 915
	/*
	 * External calls have to lead to a kick of the vcpu and
	 * therefore the vsie -> Simulate Wait state.
	 */
	atomic_or(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
916 917 918 919 920 921 922
	/*
	 * We have to adjust the g3 epoch by the g2 epoch. The epoch will
	 * automatically be adjusted on tod clock changes via kvm_sync_clock.
	 */
	preempt_disable();
	scb_s->epoch += vcpu->kvm->arch.epoch;
	preempt_enable();
923 924 925 926 927 928 929
}

/*
 * Unregister a shadow scb from a VCPU.
 */
static void unregister_shadow_scb(struct kvm_vcpu *vcpu)
{
930
	atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
931 932 933
	WRITE_ONCE(vcpu->arch.vsie_block, NULL);
}

934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956
/*
 * 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);
		}
957
		atomic_andnot(PROG_BLOCK_SIE, &scb_s->prog20);
958 959 960 961 962 963

		if (rc == -EAGAIN)
			rc = 0;
		if (rc || scb_s->icptcode || signal_pending(current) ||
		    kvm_s390_vcpu_has_irq(vcpu, 0))
			break;
964
	}
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014

	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) {
1015
		page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA);
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045
		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));
1046
	release_gmap_shadow(vsie_page);
1047
	vsie_page->fault_addr = 0;
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 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
	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;
1098
	register_shadow_scb(vcpu, vsie_page);
1099
	rc = vsie_run(vcpu, vsie_page);
1100
	unregister_shadow_scb(vcpu);
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	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)
{
1122
	struct vsie_page *vsie_page;
1123 1124 1125 1126 1127 1128 1129
	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;
1130 1131
		vsie_page = page_to_virt(page);
		release_gmap_shadow(vsie_page);
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		/* 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);
}
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void kvm_s390_vsie_kick(struct kvm_vcpu *vcpu)
{
	struct kvm_s390_sie_block *scb = READ_ONCE(vcpu->arch.vsie_block);

	/*
	 * Even if the VCPU lets go of the shadow sie block reference, it is
	 * still valid in the cache. So we can safely kick it.
	 */
	if (scb) {
		atomic_or(PROG_BLOCK_SIE, &scb->prog20);
		if (scb->prog0c & PROG_IN_SIE)
			atomic_or(CPUSTAT_STOP_INT, &scb->cpuflags);
	}
}