forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1470 lines
42 KiB
1470 lines
42 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
/* |
|
* kvm nested virtualization support for s390x |
|
* |
|
* Copyright IBM Corp. 2016, 2018 |
|
* |
|
* Author(s): David Hildenbrand <[email protected]> |
|
*/ |
|
#include <linux/vmalloc.h> |
|
#include <linux/kvm_host.h> |
|
#include <linux/bug.h> |
|
#include <linux/list.h> |
|
#include <linux/bitmap.h> |
|
#include <linux/sched/signal.h> |
|
|
|
#include <asm/gmap.h> |
|
#include <asm/mmu_context.h> |
|
#include <asm/sclp.h> |
|
#include <asm/nmi.h> |
|
#include <asm/dis.h> |
|
#include <asm/fpu/api.h> |
|
#include "kvm-s390.h" |
|
#include "gaccess.h" |
|
|
|
struct vsie_page { |
|
struct kvm_s390_sie_block scb_s; /* 0x0000 */ |
|
/* |
|
* 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 */ |
|
/* |
|
* The pinned original scb. Be aware that other VCPUs can modify |
|
* it while we read from it. Values that are used for conditions or |
|
* are reused conditionally, should be accessed via READ_ONCE. |
|
*/ |
|
struct kvm_s390_sie_block *scb_o; /* 0x0218 */ |
|
/* the shadow gmap in use by the vsie_page */ |
|
struct gmap *gmap; /* 0x0220 */ |
|
/* address of the last reported fault to guest2 */ |
|
unsigned long fault_addr; /* 0x0228 */ |
|
/* calculated guest addresses of satellite control blocks */ |
|
gpa_t sca_gpa; /* 0x0230 */ |
|
gpa_t itdba_gpa; /* 0x0238 */ |
|
gpa_t gvrd_gpa; /* 0x0240 */ |
|
gpa_t riccbd_gpa; /* 0x0248 */ |
|
gpa_t sdnx_gpa; /* 0x0250 */ |
|
__u8 reserved[0x0700 - 0x0258]; /* 0x0258 */ |
|
struct kvm_s390_crypto_cb crycb; /* 0x0700 */ |
|
__u8 fac[S390_ARCH_FAC_LIST_SIZE_BYTE]; /* 0x0800 */ |
|
}; |
|
|
|
/* 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); |
|
} |
|
|
|
/* 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); |
|
} |
|
|
|
/* 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; |
|
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; |
|
} |
|
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GPERE)) |
|
newflags |= cpuflags & CPUSTAT_P; |
|
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_GSLS)) |
|
newflags |= cpuflags & CPUSTAT_SM; |
|
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IBS)) |
|
newflags |= cpuflags & CPUSTAT_IBS; |
|
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_KSS)) |
|
newflags |= cpuflags & CPUSTAT_KSS; |
|
|
|
atomic_set(&scb_s->cpuflags, newflags); |
|
return 0; |
|
} |
|
/* Copy to APCB FORMAT1 from APCB FORMAT0 */ |
|
static int setup_apcb10(struct kvm_vcpu *vcpu, struct kvm_s390_apcb1 *apcb_s, |
|
unsigned long apcb_o, struct kvm_s390_apcb1 *apcb_h) |
|
{ |
|
struct kvm_s390_apcb0 tmp; |
|
|
|
if (read_guest_real(vcpu, apcb_o, &tmp, sizeof(struct kvm_s390_apcb0))) |
|
return -EFAULT; |
|
|
|
apcb_s->apm[0] = apcb_h->apm[0] & tmp.apm[0]; |
|
apcb_s->aqm[0] = apcb_h->aqm[0] & tmp.aqm[0] & 0xffff000000000000UL; |
|
apcb_s->adm[0] = apcb_h->adm[0] & tmp.adm[0] & 0xffff000000000000UL; |
|
|
|
return 0; |
|
|
|
} |
|
|
|
/** |
|
* setup_apcb00 - Copy to APCB FORMAT0 from APCB FORMAT0 |
|
* @vcpu: pointer to the virtual CPU |
|
* @apcb_s: pointer to start of apcb in the shadow crycb |
|
* @apcb_o: pointer to start of original apcb in the guest2 |
|
* @apcb_h: pointer to start of apcb in the guest1 |
|
* |
|
* Returns 0 and -EFAULT on error reading guest apcb |
|
*/ |
|
static int setup_apcb00(struct kvm_vcpu *vcpu, unsigned long *apcb_s, |
|
unsigned long apcb_o, unsigned long *apcb_h) |
|
{ |
|
if (read_guest_real(vcpu, apcb_o, apcb_s, |
|
sizeof(struct kvm_s390_apcb0))) |
|
return -EFAULT; |
|
|
|
bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb0)); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* setup_apcb11 - Copy the FORMAT1 APCB from the guest to the shadow CRYCB |
|
* @vcpu: pointer to the virtual CPU |
|
* @apcb_s: pointer to start of apcb in the shadow crycb |
|
* @apcb_o: pointer to start of original guest apcb |
|
* @apcb_h: pointer to start of apcb in the host |
|
* |
|
* Returns 0 and -EFAULT on error reading guest apcb |
|
*/ |
|
static int setup_apcb11(struct kvm_vcpu *vcpu, unsigned long *apcb_s, |
|
unsigned long apcb_o, |
|
unsigned long *apcb_h) |
|
{ |
|
if (read_guest_real(vcpu, apcb_o, apcb_s, |
|
sizeof(struct kvm_s390_apcb1))) |
|
return -EFAULT; |
|
|
|
bitmap_and(apcb_s, apcb_s, apcb_h, sizeof(struct kvm_s390_apcb1)); |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* setup_apcb - Create a shadow copy of the apcb. |
|
* @vcpu: pointer to the virtual CPU |
|
* @crycb_s: pointer to shadow crycb |
|
* @crycb_o: pointer to original guest crycb |
|
* @crycb_h: pointer to the host crycb |
|
* @fmt_o: format of the original guest crycb. |
|
* @fmt_h: format of the host crycb. |
|
* |
|
* Checks the compatibility between the guest and host crycb and calls the |
|
* appropriate copy function. |
|
* |
|
* Return 0 or an error number if the guest and host crycb are incompatible. |
|
*/ |
|
static int setup_apcb(struct kvm_vcpu *vcpu, struct kvm_s390_crypto_cb *crycb_s, |
|
const u32 crycb_o, |
|
struct kvm_s390_crypto_cb *crycb_h, |
|
int fmt_o, int fmt_h) |
|
{ |
|
struct kvm_s390_crypto_cb *crycb; |
|
|
|
crycb = (struct kvm_s390_crypto_cb *) (unsigned long)crycb_o; |
|
|
|
switch (fmt_o) { |
|
case CRYCB_FORMAT2: |
|
if ((crycb_o & PAGE_MASK) != ((crycb_o + 256) & PAGE_MASK)) |
|
return -EACCES; |
|
if (fmt_h != CRYCB_FORMAT2) |
|
return -EINVAL; |
|
return setup_apcb11(vcpu, (unsigned long *)&crycb_s->apcb1, |
|
(unsigned long) &crycb->apcb1, |
|
(unsigned long *)&crycb_h->apcb1); |
|
case CRYCB_FORMAT1: |
|
switch (fmt_h) { |
|
case CRYCB_FORMAT2: |
|
return setup_apcb10(vcpu, &crycb_s->apcb1, |
|
(unsigned long) &crycb->apcb0, |
|
&crycb_h->apcb1); |
|
case CRYCB_FORMAT1: |
|
return setup_apcb00(vcpu, |
|
(unsigned long *) &crycb_s->apcb0, |
|
(unsigned long) &crycb->apcb0, |
|
(unsigned long *) &crycb_h->apcb0); |
|
} |
|
break; |
|
case CRYCB_FORMAT0: |
|
if ((crycb_o & PAGE_MASK) != ((crycb_o + 32) & PAGE_MASK)) |
|
return -EACCES; |
|
|
|
switch (fmt_h) { |
|
case CRYCB_FORMAT2: |
|
return setup_apcb10(vcpu, &crycb_s->apcb1, |
|
(unsigned long) &crycb->apcb0, |
|
&crycb_h->apcb1); |
|
case CRYCB_FORMAT1: |
|
case CRYCB_FORMAT0: |
|
return setup_apcb00(vcpu, |
|
(unsigned long *) &crycb_s->apcb0, |
|
(unsigned long) &crycb->apcb0, |
|
(unsigned long *) &crycb_h->apcb0); |
|
} |
|
} |
|
return -EINVAL; |
|
} |
|
|
|
/** |
|
* shadow_crycb - Create a shadow copy of the crycb block |
|
* @vcpu: a pointer to the virtual CPU |
|
* @vsie_page: a pointer to internal date used for the vSIE |
|
* |
|
* Create a shadow copy of the crycb block and setup key wrapping, if |
|
* requested for guest 3 and enabled for guest 2. |
|
* |
|
* We accept format-1 or format-2, but we convert format-1 into format-2 |
|
* in the shadow CRYCB. |
|
* Using format-2 enables the firmware to choose the right format when |
|
* scheduling the SIE. |
|
* There is nothing to do for format-0. |
|
* |
|
* This function centralize the issuing of set_validity_icpt() for all |
|
* the subfunctions working on the crycb. |
|
* |
|
* 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; |
|
const uint32_t crycbd_o = READ_ONCE(scb_o->crycbd); |
|
const u32 crycb_addr = crycbd_o & 0x7ffffff8U; |
|
unsigned long *b1, *b2; |
|
u8 ecb3_flags; |
|
u32 ecd_flags; |
|
int apie_h; |
|
int apie_s; |
|
int key_msk = test_kvm_facility(vcpu->kvm, 76); |
|
int fmt_o = crycbd_o & CRYCB_FORMAT_MASK; |
|
int fmt_h = vcpu->arch.sie_block->crycbd & CRYCB_FORMAT_MASK; |
|
int ret = 0; |
|
|
|
scb_s->crycbd = 0; |
|
|
|
apie_h = vcpu->arch.sie_block->eca & ECA_APIE; |
|
apie_s = apie_h & scb_o->eca; |
|
if (!apie_s && (!key_msk || (fmt_o == CRYCB_FORMAT0))) |
|
return 0; |
|
|
|
if (!crycb_addr) |
|
return set_validity_icpt(scb_s, 0x0039U); |
|
|
|
if (fmt_o == CRYCB_FORMAT1) |
|
if ((crycb_addr & PAGE_MASK) != |
|
((crycb_addr + 128) & PAGE_MASK)) |
|
return set_validity_icpt(scb_s, 0x003CU); |
|
|
|
if (apie_s) { |
|
ret = setup_apcb(vcpu, &vsie_page->crycb, crycb_addr, |
|
vcpu->kvm->arch.crypto.crycb, |
|
fmt_o, fmt_h); |
|
if (ret) |
|
goto end; |
|
scb_s->eca |= scb_o->eca & ECA_APIE; |
|
} |
|
|
|
/* we may only allow it if enabled for guest 2 */ |
|
ecb3_flags = scb_o->ecb3 & vcpu->arch.sie_block->ecb3 & |
|
(ECB3_AES | ECB3_DEA); |
|
ecd_flags = scb_o->ecd & vcpu->arch.sie_block->ecd & ECD_ECC; |
|
if (!ecb3_flags && !ecd_flags) |
|
goto end; |
|
|
|
/* copy only the wrapping keys */ |
|
if (read_guest_real(vcpu, crycb_addr + 72, |
|
vsie_page->crycb.dea_wrapping_key_mask, 56)) |
|
return set_validity_icpt(scb_s, 0x0035U); |
|
|
|
scb_s->ecb3 |= ecb3_flags; |
|
scb_s->ecd |= ecd_flags; |
|
|
|
/* 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); |
|
end: |
|
switch (ret) { |
|
case -EINVAL: |
|
return set_validity_icpt(scb_s, 0x0022U); |
|
case -EFAULT: |
|
return set_validity_icpt(scb_s, 0x0035U); |
|
case -EACCES: |
|
return set_validity_icpt(scb_s, 0x003CU); |
|
} |
|
scb_s->crycbd = ((__u32)(__u64) &vsie_page->crycb) | CRYCB_FORMAT2; |
|
return 0; |
|
} |
|
|
|
/* 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; |
|
/* READ_ONCE does not work on bitfields - use a temporary variable */ |
|
const uint32_t __new_ibc = scb_o->ibc; |
|
const uint32_t new_ibc = READ_ONCE(__new_ibc) & 0x0fffU; |
|
__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 && new_ibc) { |
|
scb_s->ibc = new_ibc; |
|
/* 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; |
|
} |
|
} |
|
|
|
/* 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; |
|
|
|
/* branch prediction */ |
|
if (test_kvm_facility(vcpu->kvm, 82)) { |
|
scb_o->fpf &= ~FPF_BPBC; |
|
scb_o->fpf |= scb_s->fpf & FPF_BPBC; |
|
} |
|
|
|
/* 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; |
|
} |
|
|
|
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; |
|
/* READ_ONCE does not work on bitfields - use a temporary variable */ |
|
const uint32_t __new_prefix = scb_o->prefix; |
|
const uint32_t new_prefix = READ_ONCE(__new_prefix); |
|
const bool wants_tx = READ_ONCE(scb_o->ecb) & ECB_TE; |
|
bool had_tx = scb_s->ecb & ECB_TE; |
|
unsigned long new_mso = 0; |
|
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; |
|
scb_s->fac = 0; |
|
scb_s->fpf = 0; |
|
|
|
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. |
|
*/ |
|
if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_KSS)) |
|
scb_s->ictl |= ICTL_ISKE | ICTL_SSKE | ICTL_RRBE; |
|
|
|
scb_s->icpua = scb_o->icpua; |
|
|
|
if (!(atomic_read(&scb_s->cpuflags) & CPUSTAT_SM)) |
|
new_mso = READ_ONCE(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 != new_prefix) |
|
prefix_unmapped(vsie_page); |
|
/* SIE will do mso/msl validity and exception checks for us */ |
|
scb_s->msl = scb_o->msl & 0xfffffffffff00000UL; |
|
scb_s->mso = new_mso; |
|
scb_s->prefix = new_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 & (ECA_MVPGI | ECA_PROTEXCI); |
|
/* 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 & ECB_HOSTPROTINT; |
|
/* transactional execution */ |
|
if (test_kvm_facility(vcpu->kvm, 73) && wants_tx) { |
|
/* remap the prefix is tx is toggled on */ |
|
if (!had_tx) |
|
prefix_unmapped(vsie_page); |
|
scb_s->ecb |= ECB_TE; |
|
} |
|
/* branch prediction */ |
|
if (test_kvm_facility(vcpu->kvm, 82)) |
|
scb_s->fpf |= scb_o->fpf & FPF_BPBC; |
|
/* SIMD */ |
|
if (test_kvm_facility(vcpu->kvm, 129)) { |
|
scb_s->eca |= scb_o->eca & ECA_VX; |
|
scb_s->ecd |= scb_o->ecd & ECD_HOSTREGMGMT; |
|
} |
|
/* Run-time-Instrumentation */ |
|
if (test_kvm_facility(vcpu->kvm, 64)) |
|
scb_s->ecb3 |= scb_o->ecb3 & ECB3_RI; |
|
/* Instruction Execution Prevention */ |
|
if (test_kvm_facility(vcpu->kvm, 130)) |
|
scb_s->ecb2 |= scb_o->ecb2 & ECB2_IEP; |
|
/* 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; |
|
} |
|
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_SIIF)) |
|
scb_s->eca |= scb_o->eca & ECA_SII; |
|
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_IB)) |
|
scb_s->eca |= scb_o->eca & ECA_IB; |
|
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_CEI)) |
|
scb_s->eca |= scb_o->eca & ECA_CEI; |
|
/* Epoch Extension */ |
|
if (test_kvm_facility(vcpu->kvm, 139)) |
|
scb_s->ecd |= scb_o->ecd & ECD_MEF; |
|
|
|
/* etoken */ |
|
if (test_kvm_facility(vcpu->kvm, 156)) |
|
scb_s->ecd |= scb_o->ecd & ECD_ETOKENF; |
|
|
|
scb_s->hpid = HPID_VSIE; |
|
scb_s->cpnc = scb_o->cpnc; |
|
|
|
prepare_ibc(vcpu, vsie_page); |
|
rc = shadow_crycb(vcpu, vsie_page); |
|
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; |
|
if (prefix <= end && start <= prefix + 2 * PAGE_SIZE - 1) |
|
prefix_unmapped_sync(cur); |
|
} |
|
} |
|
|
|
/* |
|
* Map the first prefix page and if tx is enabled also the second prefix page. |
|
* |
|
* 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; |
|
|
|
if (prefix_is_mapped(vsie_page)) |
|
return 0; |
|
|
|
/* 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, NULL); |
|
if (!rc && (scb_s->ecb & ECB_TE)) |
|
rc = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, |
|
prefix + PAGE_SIZE, NULL); |
|
/* |
|
* 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; |
|
|
|
page = gfn_to_page(kvm, gpa_to_gfn(gpa)); |
|
if (is_error_page(page)) |
|
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) |
|
{ |
|
kvm_release_pfn_dirty(hpa >> PAGE_SHIFT); |
|
/* 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_s = &vsie_page->scb_s; |
|
hpa_t hpa; |
|
|
|
hpa = (u64) scb_s->scaoh << 32 | scb_s->scaol; |
|
if (hpa) { |
|
unpin_guest_page(vcpu->kvm, vsie_page->sca_gpa, hpa); |
|
vsie_page->sca_gpa = 0; |
|
scb_s->scaol = 0; |
|
scb_s->scaoh = 0; |
|
} |
|
|
|
hpa = scb_s->itdba; |
|
if (hpa) { |
|
unpin_guest_page(vcpu->kvm, vsie_page->itdba_gpa, hpa); |
|
vsie_page->itdba_gpa = 0; |
|
scb_s->itdba = 0; |
|
} |
|
|
|
hpa = scb_s->gvrd; |
|
if (hpa) { |
|
unpin_guest_page(vcpu->kvm, vsie_page->gvrd_gpa, hpa); |
|
vsie_page->gvrd_gpa = 0; |
|
scb_s->gvrd = 0; |
|
} |
|
|
|
hpa = scb_s->riccbd; |
|
if (hpa) { |
|
unpin_guest_page(vcpu->kvm, vsie_page->riccbd_gpa, hpa); |
|
vsie_page->riccbd_gpa = 0; |
|
scb_s->riccbd = 0; |
|
} |
|
|
|
hpa = scb_s->sdnxo; |
|
if (hpa) { |
|
unpin_guest_page(vcpu->kvm, vsie_page->sdnx_gpa, hpa); |
|
vsie_page->sdnx_gpa = 0; |
|
scb_s->sdnxo = 0; |
|
} |
|
} |
|
|
|
/* |
|
* 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 = READ_ONCE(scb_o->scaol) & ~0xfUL; |
|
if (test_kvm_cpu_feat(vcpu->kvm, KVM_S390_VM_CPU_FEAT_64BSCAO)) |
|
gpa |= (u64) READ_ONCE(scb_o->scaoh) << 32; |
|
if (gpa) { |
|
if (gpa < 2 * PAGE_SIZE) |
|
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) |
|
rc = set_validity_icpt(scb_s, 0x0034U); |
|
} |
|
if (rc) |
|
goto unpin; |
|
vsie_page->sca_gpa = gpa; |
|
scb_s->scaoh = (u32)((u64)hpa >> 32); |
|
scb_s->scaol = (u32)(u64)hpa; |
|
} |
|
|
|
gpa = READ_ONCE(scb_o->itdba) & ~0xffUL; |
|
if (gpa && (scb_s->ecb & ECB_TE)) { |
|
if (gpa < 2 * PAGE_SIZE) { |
|
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) { |
|
rc = set_validity_icpt(scb_s, 0x0080U); |
|
goto unpin; |
|
} |
|
vsie_page->itdba_gpa = gpa; |
|
scb_s->itdba = hpa; |
|
} |
|
|
|
gpa = READ_ONCE(scb_o->gvrd) & ~0x1ffUL; |
|
if (gpa && (scb_s->eca & ECA_VX) && !(scb_s->ecd & ECD_HOSTREGMGMT)) { |
|
if (gpa < 2 * PAGE_SIZE) { |
|
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) { |
|
rc = set_validity_icpt(scb_s, 0x1310U); |
|
goto unpin; |
|
} |
|
vsie_page->gvrd_gpa = gpa; |
|
scb_s->gvrd = hpa; |
|
} |
|
|
|
gpa = READ_ONCE(scb_o->riccbd) & ~0x3fUL; |
|
if (gpa && (scb_s->ecb3 & ECB3_RI)) { |
|
if (gpa < 2 * PAGE_SIZE) { |
|
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) { |
|
rc = set_validity_icpt(scb_s, 0x0043U); |
|
goto unpin; |
|
} |
|
/* Validity 0x0044 will be checked by SIE */ |
|
vsie_page->riccbd_gpa = gpa; |
|
scb_s->riccbd = hpa; |
|
} |
|
if (((scb_s->ecb & ECB_GS) && !(scb_s->ecd & ECD_HOSTREGMGMT)) || |
|
(scb_s->ecd & ECD_ETOKENF)) { |
|
unsigned long sdnxc; |
|
|
|
gpa = READ_ONCE(scb_o->sdnxo) & ~0xfUL; |
|
sdnxc = READ_ONCE(scb_o->sdnxo) & 0xfUL; |
|
if (!gpa || gpa < 2 * PAGE_SIZE) { |
|
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) { |
|
rc = set_validity_icpt(scb_s, 0x10b0U); |
|
goto unpin; |
|
} |
|
vsie_page->sdnx_gpa = gpa; |
|
scb_s->sdnxo = hpa | sdnxc; |
|
} |
|
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); |
|
if (rc) { |
|
rc = kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); |
|
WARN_ON_ONCE(rc); |
|
return 1; |
|
} |
|
vsie_page->scb_o = (struct kvm_s390_sie_block *) hpa; |
|
return 0; |
|
} |
|
|
|
/* |
|
* 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, NULL); |
|
if (rc > 0) { |
|
rc = inject_fault(vcpu, rc, |
|
current->thread.gmap_addr, |
|
current->thread.gmap_write_flag); |
|
if (rc >= 0) |
|
vsie_page->fault_addr = current->thread.gmap_addr; |
|
} |
|
return rc; |
|
} |
|
|
|
/* |
|
* 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, NULL); |
|
vsie_page->fault_addr = 0; |
|
} |
|
|
|
static inline void clear_vsie_icpt(struct vsie_page *vsie_page) |
|
{ |
|
vsie_page->scb_s.icptcode = 0; |
|
} |
|
|
|
/* 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 = READ_ONCE(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; |
|
} |
|
|
|
/* |
|
* Get a register for a nested guest. |
|
* @vcpu the vcpu of the guest |
|
* @vsie_page the vsie_page for the nested guest |
|
* @reg the register number, the upper 4 bits are ignored. |
|
* returns: the value of the register. |
|
*/ |
|
static u64 vsie_get_register(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page, u8 reg) |
|
{ |
|
/* no need to validate the parameter and/or perform error handling */ |
|
reg &= 0xf; |
|
switch (reg) { |
|
case 15: |
|
return vsie_page->scb_s.gg15; |
|
case 14: |
|
return vsie_page->scb_s.gg14; |
|
default: |
|
return vcpu->run->s.regs.gprs[reg]; |
|
} |
|
} |
|
|
|
static int vsie_handle_mvpg(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) |
|
{ |
|
struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; |
|
unsigned long pei_dest, pei_src, src, dest, mask, prefix; |
|
u64 *pei_block = &vsie_page->scb_o->mcic; |
|
int edat, rc_dest, rc_src; |
|
union ctlreg0 cr0; |
|
|
|
cr0.val = vcpu->arch.sie_block->gcr[0]; |
|
edat = cr0.edat && test_kvm_facility(vcpu->kvm, 8); |
|
mask = _kvm_s390_logical_to_effective(&scb_s->gpsw, PAGE_MASK); |
|
prefix = scb_s->prefix << GUEST_PREFIX_SHIFT; |
|
|
|
dest = vsie_get_register(vcpu, vsie_page, scb_s->ipb >> 20) & mask; |
|
dest = _kvm_s390_real_to_abs(prefix, dest) + scb_s->mso; |
|
src = vsie_get_register(vcpu, vsie_page, scb_s->ipb >> 16) & mask; |
|
src = _kvm_s390_real_to_abs(prefix, src) + scb_s->mso; |
|
|
|
rc_dest = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, dest, &pei_dest); |
|
rc_src = kvm_s390_shadow_fault(vcpu, vsie_page->gmap, src, &pei_src); |
|
/* |
|
* Either everything went well, or something non-critical went wrong |
|
* e.g. because of a race. In either case, simply retry. |
|
*/ |
|
if (rc_dest == -EAGAIN || rc_src == -EAGAIN || (!rc_dest && !rc_src)) { |
|
retry_vsie_icpt(vsie_page); |
|
return -EAGAIN; |
|
} |
|
/* Something more serious went wrong, propagate the error */ |
|
if (rc_dest < 0) |
|
return rc_dest; |
|
if (rc_src < 0) |
|
return rc_src; |
|
|
|
/* The only possible suppressing exception: just deliver it */ |
|
if (rc_dest == PGM_TRANSLATION_SPEC || rc_src == PGM_TRANSLATION_SPEC) { |
|
clear_vsie_icpt(vsie_page); |
|
rc_dest = kvm_s390_inject_program_int(vcpu, PGM_TRANSLATION_SPEC); |
|
WARN_ON_ONCE(rc_dest); |
|
return 1; |
|
} |
|
|
|
/* |
|
* Forward the PEI intercept to the guest if it was a page fault, or |
|
* also for segment and region table faults if EDAT applies. |
|
*/ |
|
if (edat) { |
|
rc_dest = rc_dest == PGM_ASCE_TYPE ? rc_dest : 0; |
|
rc_src = rc_src == PGM_ASCE_TYPE ? rc_src : 0; |
|
} else { |
|
rc_dest = rc_dest != PGM_PAGE_TRANSLATION ? rc_dest : 0; |
|
rc_src = rc_src != PGM_PAGE_TRANSLATION ? rc_src : 0; |
|
} |
|
if (!rc_dest && !rc_src) { |
|
pei_block[0] = pei_dest; |
|
pei_block[1] = pei_src; |
|
return 1; |
|
} |
|
|
|
retry_vsie_icpt(vsie_page); |
|
|
|
/* |
|
* The host has edat, and the guest does not, or it was an ASCE type |
|
* exception. The host needs to inject the appropriate DAT interrupts |
|
* into the guest. |
|
*/ |
|
if (rc_dest) |
|
return inject_fault(vcpu, rc_dest, dest, 1); |
|
return inject_fault(vcpu, rc_src, src, 0); |
|
} |
|
|
|
/* |
|
* 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) |
|
__releases(vcpu->kvm->srcu) |
|
__acquires(vcpu->kvm->srcu) |
|
{ |
|
struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; |
|
struct kvm_s390_sie_block *scb_o = vsie_page->scb_o; |
|
int guest_bp_isolation; |
|
int rc = 0; |
|
|
|
handle_last_fault(vcpu, vsie_page); |
|
|
|
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |
|
|
|
/* save current guest state of bp isolation override */ |
|
guest_bp_isolation = test_thread_flag(TIF_ISOLATE_BP_GUEST); |
|
|
|
/* |
|
* The guest is running with BPBC, so we have to force it on for our |
|
* nested guest. This is done by enabling BPBC globally, so the BPBC |
|
* control in the SCB (which the nested guest can modify) is simply |
|
* ignored. |
|
*/ |
|
if (test_kvm_facility(vcpu->kvm, 82) && |
|
vcpu->arch.sie_block->fpf & FPF_BPBC) |
|
set_thread_flag(TIF_ISOLATE_BP_GUEST); |
|
|
|
local_irq_disable(); |
|
guest_enter_irqoff(); |
|
local_irq_enable(); |
|
|
|
/* |
|
* Simulate a SIE entry of the VCPU (see sie64a), so VCPU blocking |
|
* and VCPU requests also hinder the vSIE from running and lead |
|
* to an immediate exit. kvm_s390_vsie_kick() has to be used to |
|
* also kick the vSIE. |
|
*/ |
|
vcpu->arch.sie_block->prog0c |= PROG_IN_SIE; |
|
barrier(); |
|
if (test_cpu_flag(CIF_FPU)) |
|
load_fpu_regs(); |
|
if (!kvm_s390_vcpu_sie_inhibited(vcpu)) |
|
rc = sie64a(scb_s, vcpu->run->s.regs.gprs); |
|
barrier(); |
|
vcpu->arch.sie_block->prog0c &= ~PROG_IN_SIE; |
|
|
|
local_irq_disable(); |
|
guest_exit_irqoff(); |
|
local_irq_enable(); |
|
|
|
/* restore guest state for bp isolation override */ |
|
if (!guest_bp_isolation) |
|
clear_thread_flag(TIF_ISOLATE_BP_GUEST); |
|
|
|
vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu); |
|
|
|
if (rc == -EINTR) { |
|
VCPU_EVENT(vcpu, 3, "%s", "machine check"); |
|
kvm_s390_reinject_machine_check(vcpu, &vsie_page->mcck_info); |
|
return 0; |
|
} |
|
|
|
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) { |
|
case ICPT_INST: |
|
if (scb_s->ipa == 0xb2b0) |
|
rc = handle_stfle(vcpu, vsie_page); |
|
break; |
|
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; |
|
case ICPT_PARTEXEC: |
|
if (scb_s->ipa == 0xb254) |
|
rc = vsie_handle_mvpg(vcpu, vsie_page); |
|
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); |
|
prefix_unmapped(vsie_page); |
|
} |
|
|
|
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); |
|
|
|
/* |
|
* 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); |
|
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; |
|
} |
|
|
|
/* |
|
* 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) |
|
{ |
|
struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s; |
|
|
|
WRITE_ONCE(vcpu->arch.vsie_block, &vsie_page->scb_s); |
|
/* |
|
* External calls have to lead to a kick of the vcpu and |
|
* therefore the vsie -> Simulate Wait state. |
|
*/ |
|
kvm_s390_set_cpuflags(vcpu, CPUSTAT_WAIT); |
|
/* |
|
* 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; |
|
|
|
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; |
|
} |
|
|
|
preempt_enable(); |
|
} |
|
|
|
/* |
|
* Unregister a shadow scb from a VCPU. |
|
*/ |
|
static void unregister_shadow_scb(struct kvm_vcpu *vcpu) |
|
{ |
|
kvm_s390_clear_cpuflags(vcpu, CPUSTAT_WAIT); |
|
WRITE_ONCE(vcpu->arch.vsie_block, NULL); |
|
} |
|
|
|
/* |
|
* 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); |
|
} |
|
atomic_andnot(PROG_BLOCK_SIE, &scb_s->prog20); |
|
|
|
if (rc == -EAGAIN) |
|
rc = 0; |
|
if (rc || scb_s->icptcode || signal_pending(current) || |
|
kvm_s390_vcpu_has_irq(vcpu, 0) || |
|
kvm_s390_vcpu_sie_inhibited(vcpu)) |
|
break; |
|
cond_resched(); |
|
} |
|
|
|
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); |
|
rc = 1; |
|
} |
|
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) { |
|
page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO | GFP_DMA); |
|
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)); |
|
release_gmap_shadow(vsie_page); |
|
vsie_page->fault_addr = 0; |
|
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) != PAGE_SIZE); |
|
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) || |
|
kvm_s390_vcpu_sie_inhibited(vcpu)) |
|
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; |
|
register_shadow_scb(vcpu, vsie_page); |
|
rc = vsie_run(vcpu, vsie_page); |
|
unregister_shadow_scb(vcpu); |
|
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_ACCOUNT); |
|
} |
|
|
|
/* Destroy the vsie data structures. To be called when a vm is destroyed. */ |
|
void kvm_s390_vsie_destroy(struct kvm *kvm) |
|
{ |
|
struct vsie_page *vsie_page; |
|
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; |
|
vsie_page = page_to_virt(page); |
|
release_gmap_shadow(vsie_page); |
|
/* 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); |
|
} |
|
|
|
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); |
|
} |
|
}
|
|
|