vsie.c 32.0 KB
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// SPDX-License-Identifier: GPL-2.0
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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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	/* Epoch Extension */
	if (test_kvm_facility(vcpu->kvm, 139))
		scb_s->ecd |= scb_o->ecd & ECD_MEF;
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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
 */
static int pin_guest_page(struct kvm *kvm, gpa_t gpa, hpa_t *hpa)
{
	struct page *page;

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	page = gfn_to_page(kvm, gpa_to_gfn(gpa));
	if (is_error_page(page))
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		return -EINVAL;
	*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)
{
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	kvm_release_pfn_dirty(hpa >> PAGE_SHIFT);
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	/* 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;
537 538
	if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO))
		gpa |= (u64) scb_o->scaoh << 32;
539 540 541 542 543 544 545 546 547 548
	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);
549
			if (rc)
550 551 552 553 554 555 556
				rc = set_validity_icpt(scb_s, 0x0034U);
		}
		if (rc)
			goto unpin;
		scb_s->scaoh = (u32)((u64)hpa >> 32);
		scb_s->scaol = (u32)(u64)hpa;
	}
557 558

	gpa = scb_o->itdba & ~0xffUL;
559
	if (gpa && (scb_s->ecb & ECB_TE)) {
560 561 562 563 564 565
		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);
566
		if (rc) {
567 568
			rc = set_validity_icpt(scb_s, 0x0080U);
			goto unpin;
569
		}
570 571
		scb_s->itdba = hpa;
	}
572 573

	gpa = scb_o->gvrd & ~0x1ffUL;
574
	if (gpa && (scb_s->eca & ECA_VX) && !(scb_s->ecd & ECD_HOSTREGMGMT)) {
575 576 577 578 579 580 581 582 583
		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);
584
		if (rc) {
585 586
			rc = set_validity_icpt(scb_s, 0x1310U);
			goto unpin;
587
		}
588 589
		scb_s->gvrd = hpa;
	}
590 591

	gpa = scb_o->riccbd & ~0x3fUL;
592
	if (gpa && (scb_s->ecb3 & ECB3_RI)) {
593 594 595 596 597 598
		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);
599
		if (rc) {
600 601
			rc = set_validity_icpt(scb_s, 0x0043U);
			goto unpin;
602 603
		}
		/* Validity 0x0044 will be checked by SIE */
D
David Hildenbrand 已提交
604
		scb_s->riccbd = hpa;
605
	}
F
Fan Zhang 已提交
606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626
	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);
627
		if (rc) {
F
Fan Zhang 已提交
628 629
			rc = set_validity_icpt(scb_s, 0x10b0U);
			goto unpin;
630
		}
631
		scb_s->sdnxo = hpa | sdnxc;
F
Fan Zhang 已提交
632
	}
633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662
	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
 */
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);
663
	if (rc) {
664
		rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);
665 666
		WARN_ON_ONCE(rc);
		return 1;
667
	}
668 669
	vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa;
	return 0;
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
}

/*
 * 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);
723 724
		if (rc >= 0)
			vsie_page->fault_addr = current->thread.gmap_addr;
725 726 727 728
	}
	return rc;
}

729 730 731 732 733 734 735 736 737 738 739 740 741 742 743
/*
 * 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;
}

744 745 746 747 748
static inline void clear_vsie_icpt(struct vsie_page *vsie_page)
{
	vsie_page->scb_s.icptcode = 0;
}

749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786
/* 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;
}

787 788 789 790 791 792 793 794 795 796 797 798 799 800
/*
 * 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;

801 802
	handle_last_fault(vcpu, vsie_page);

803 804 805 806 807 808 809
	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();
810
	guest_enter_irqoff();
811 812 813 814 815
	local_irq_enable();

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

	local_irq_disable();
816
	guest_exit_irqoff();
817 818 819
	local_irq_enable();
	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

820 821
	if (rc == -EINTR) {
		VCPU_EVENT(vcpu, 3, "%s", "machine check");
822
		kvm_s390_reinject_machine_check(vcpu, &vsie_page->mcck_info);
823 824 825
		return 0;
	}

826 827 828 829 830 831
	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) {
832 833 834 835
	case ICPT_INST:
		if (scb_s->ipa == 0xb2b0)
			rc = handle_stfle(vcpu, vsie_page);
		break;
836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853
	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);
854
	prefix_unmapped(vsie_page);
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869
}

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);

870 871 872 873 874 875 876 877 878 879
	/*
	 * 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);
880 881 882 883 884 885 886 887
	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;
}

888 889 890 891 892 893
/*
 * 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)
{
894 895
	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;

896
	WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s);
897 898 899 900 901
	/*
	 * 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);
902 903 904 905 906 907
	/*
	 * 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;
908 909 910 911 912 913 914

	if (scb_s->ecd & ECD_MEF) {
		scb_s->epdx += vcpu->kvm->arch.epdx;
		if (scb_s->epoch < vcpu->kvm->arch.epoch)
			scb_s->epdx += 1;
	}

915
	preempt_enable();
916 917 918 919 920 921 922
}

/*
 * Unregister a shadow scb from a VCPU.
 */
static void unregister_shadow_scb(struct kvm_vcpu *vcpu)
{
923
	atomic_andnot(CPUSTAT_WAIT, &vcpu->arch.sie_block->cpuflags);
924 925 926
	WRITE_ONCE(vcpu->arch.vsie_block, NULL);
}

927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949
/*
 * 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);
		}
950
		atomic_andnot(PROG_BLOCK_SIE, &scb_s->prog20);
951 952 953 954 955 956

		if (rc == -EAGAIN)
			rc = 0;
		if (rc || scb_s->icptcode || signal_pending(current) ||
		    kvm_s390_vcpu_has_irq(vcpu, 0))
			break;
957
	}
958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007

	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) {
1008
		page = alloc_page(GFP_KERNEL | __GFP_ZERO | GFP_DMA);
1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038
		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));
1039
	release_gmap_shadow(vsie_page);
1040
	vsie_page->fault_addr = 0;
1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064
	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);

1065
	BUILD_BUG_ON(sizeof(struct vsie_page) != PAGE_SIZE);
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
	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;
1091
	register_shadow_scb(vcpu, vsie_page);
1092
	rc = vsie_run(vcpu, vsie_page);
1093
	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)
{
1115
	struct vsie_page *vsie_page;
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	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;
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		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);
	}
}