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-rw-r--r--arch/x86/include/asm/kvm_host.h1
-rw-r--r--arch/x86/kvm/cpuid.c2
-rw-r--r--arch/x86/kvm/hyperv.c27
-rw-r--r--arch/x86/kvm/hyperv.h3
-rw-r--r--arch/x86/kvm/x86.c2
-rw-r--r--arch/x86/kvm/xen.c2
-rw-r--r--tools/testing/selftests/kvm/include/x86_64/processor.h1
-rw-r--r--tools/testing/selftests/kvm/lib/x86_64/processor.c35
-rw-r--r--tools/testing/selftests/kvm/x86_64/evmcs_test.c40
-rw-r--r--tools/testing/selftests/kvm/x86_64/xen_vmcall_test.c2
10 files changed, 69 insertions, 46 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 95eb6e93a4b7..84499aad01a4 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -736,6 +736,7 @@ struct kvm_vcpu_arch {
/* used for guest single stepping over the given code position */
unsigned long singlestep_rip;
+ bool hyperv_enabled;
struct kvm_vcpu_hv *hyperv;
struct kvm_vcpu_xen xen;
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index f47bbd4b0837..c8f2592ccc99 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -179,6 +179,8 @@ static void kvm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
vcpu->arch.cr4_guest_rsvd_bits =
__cr4_reserved_bits(guest_cpuid_has, vcpu);
+ kvm_hv_set_cpuid(vcpu);
+
/* Invoke the vendor callback only after the above state is updated. */
static_call(kvm_x86_vcpu_after_set_cpuid)(vcpu);
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 333bd200f186..11d16fe52324 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -37,6 +37,9 @@
#include "trace.h"
#include "irq.h"
+/* "Hv#1" signature */
+#define HYPERV_CPUID_SIGNATURE_EAX 0x31237648
+
#define KVM_HV_MAX_SPARSE_VCPU_SET_BITS DIV_ROUND_UP(KVM_MAX_VCPUS, 64)
static void stimer_mark_pending(struct kvm_vcpu_hv_stimer *stimer,
@@ -1473,6 +1476,9 @@ int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host)
{
struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
+ if (!host && !vcpu->arch.hyperv_enabled)
+ return 1;
+
if (kvm_hv_msr_partition_wide(msr)) {
int r;
@@ -1488,6 +1494,9 @@ int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host)
{
struct kvm_hv *hv = to_kvm_hv(vcpu->kvm);
+ if (!host && !vcpu->arch.hyperv_enabled)
+ return 1;
+
if (kvm_hv_msr_partition_wide(msr)) {
int r;
@@ -1701,9 +1710,20 @@ ret_success:
return HV_STATUS_SUCCESS;
}
-bool kvm_hv_hypercall_enabled(struct kvm *kvm)
+void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu)
+{
+ struct kvm_cpuid_entry2 *entry;
+
+ entry = kvm_find_cpuid_entry(vcpu, HYPERV_CPUID_INTERFACE, 0);
+ if (entry && entry->eax == HYPERV_CPUID_SIGNATURE_EAX)
+ vcpu->arch.hyperv_enabled = true;
+ else
+ vcpu->arch.hyperv_enabled = false;
+}
+
+bool kvm_hv_hypercall_enabled(struct kvm_vcpu *vcpu)
{
- return to_kvm_hv(kvm)->hv_guest_os_id != 0;
+ return vcpu->arch.hyperv_enabled && to_kvm_hv(vcpu->kvm)->hv_guest_os_id;
}
static void kvm_hv_hypercall_set_result(struct kvm_vcpu *vcpu, u64 result)
@@ -2036,8 +2056,7 @@ int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
break;
case HYPERV_CPUID_INTERFACE:
- memcpy(signature, "Hv#1\0\0\0\0\0\0\0\0", 12);
- ent->eax = signature[0];
+ ent->eax = HYPERV_CPUID_SIGNATURE_EAX;
break;
case HYPERV_CPUID_VERSION:
diff --git a/arch/x86/kvm/hyperv.h b/arch/x86/kvm/hyperv.h
index 4bc2ab0caa92..f28e7fb88765 100644
--- a/arch/x86/kvm/hyperv.h
+++ b/arch/x86/kvm/hyperv.h
@@ -92,7 +92,7 @@ static inline u32 kvm_hv_get_vpindex(struct kvm_vcpu *vcpu)
int kvm_hv_set_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 data, bool host);
int kvm_hv_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata, bool host);
-bool kvm_hv_hypercall_enabled(struct kvm *kvm);
+bool kvm_hv_hypercall_enabled(struct kvm_vcpu *vcpu);
int kvm_hv_hypercall(struct kvm_vcpu *vcpu);
void kvm_hv_irq_routing_update(struct kvm *kvm);
@@ -141,6 +141,7 @@ void kvm_hv_setup_tsc_page(struct kvm *kvm,
void kvm_hv_init_vm(struct kvm *kvm);
void kvm_hv_destroy_vm(struct kvm *kvm);
+void kvm_hv_set_cpuid(struct kvm_vcpu *vcpu);
int kvm_vm_ioctl_hv_eventfd(struct kvm *kvm, struct kvm_hyperv_eventfd *args);
int kvm_get_hv_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid,
struct kvm_cpuid_entry2 __user *entries);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a75d01523c4f..1e5c304d14ab 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8162,7 +8162,7 @@ int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
if (kvm_xen_hypercall_enabled(vcpu->kvm))
return kvm_xen_hypercall(vcpu);
- if (kvm_hv_hypercall_enabled(vcpu->kvm))
+ if (kvm_hv_hypercall_enabled(vcpu))
return kvm_hv_hypercall(vcpu);
nr = kvm_rax_read(vcpu);
diff --git a/arch/x86/kvm/xen.c b/arch/x86/kvm/xen.c
index b414fed1576b..b08a688e56f9 100644
--- a/arch/x86/kvm/xen.c
+++ b/arch/x86/kvm/xen.c
@@ -369,7 +369,7 @@ int kvm_xen_hypercall(struct kvm_vcpu *vcpu)
/* Hyper-V hypercalls get bit 31 set in EAX */
if ((input & 0x80000000) &&
- kvm_hv_hypercall_enabled(vcpu->kvm))
+ kvm_hv_hypercall_enabled(vcpu))
return kvm_hv_hypercall(vcpu);
longmode = is_64_bit_mode(vcpu);
diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 42292d676eff..0b30b4e15c38 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -407,6 +407,7 @@ uint64_t kvm_hypercall(uint64_t nr, uint64_t a0, uint64_t a1, uint64_t a2,
uint64_t a3);
struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void);
+void vcpu_set_hv_cpuid(struct kvm_vm *vm, uint32_t vcpuid);
struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vm *vm, uint32_t vcpuid);
/*
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c
index 18483df2b331..de0c76177d02 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -1323,6 +1323,41 @@ struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void)
return cpuid;
}
+void vcpu_set_hv_cpuid(struct kvm_vm *vm, uint32_t vcpuid)
+{
+ static struct kvm_cpuid2 *cpuid_full;
+ struct kvm_cpuid2 *cpuid_sys, *cpuid_hv;
+ int i, nent = 0;
+
+ if (!cpuid_full) {
+ cpuid_sys = kvm_get_supported_cpuid();
+ cpuid_hv = kvm_get_supported_hv_cpuid();
+
+ cpuid_full = malloc(sizeof(*cpuid_full) +
+ (cpuid_sys->nent + cpuid_hv->nent) *
+ sizeof(struct kvm_cpuid_entry2));
+ if (!cpuid_full) {
+ perror("malloc");
+ abort();
+ }
+
+ /* Need to skip KVM CPUID leaves 0x400000xx */
+ for (i = 0; i < cpuid_sys->nent; i++) {
+ if (cpuid_sys->entries[i].function >= 0x40000000 &&
+ cpuid_sys->entries[i].function < 0x40000100)
+ continue;
+ cpuid_full->entries[nent] = cpuid_sys->entries[i];
+ nent++;
+ }
+
+ memcpy(&cpuid_full->entries[nent], cpuid_hv->entries,
+ cpuid_hv->nent * sizeof(struct kvm_cpuid_entry2));
+ cpuid_full->nent = nent + cpuid_hv->nent;
+ }
+
+ vcpu_set_cpuid(vm, vcpuid, cpuid_full);
+}
+
struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vm *vm, uint32_t vcpuid)
{
static struct kvm_cpuid2 *cpuid;
diff --git a/tools/testing/selftests/kvm/x86_64/evmcs_test.c b/tools/testing/selftests/kvm/x86_64/evmcs_test.c
index 39a3cb2bd103..ca22ee6d19cb 100644
--- a/tools/testing/selftests/kvm/x86_64/evmcs_test.c
+++ b/tools/testing/selftests/kvm/x86_64/evmcs_test.c
@@ -78,42 +78,6 @@ void guest_code(struct vmx_pages *vmx_pages)
GUEST_ASSERT(vmlaunch());
}
-struct kvm_cpuid2 *guest_get_cpuid(void)
-{
- static struct kvm_cpuid2 *cpuid_full;
- struct kvm_cpuid2 *cpuid_sys, *cpuid_hv;
- int i, nent = 0;
-
- if (cpuid_full)
- return cpuid_full;
-
- cpuid_sys = kvm_get_supported_cpuid();
- cpuid_hv = kvm_get_supported_hv_cpuid();
-
- cpuid_full = malloc(sizeof(*cpuid_full) +
- (cpuid_sys->nent + cpuid_hv->nent) *
- sizeof(struct kvm_cpuid_entry2));
- if (!cpuid_full) {
- perror("malloc");
- abort();
- }
-
- /* Need to skip KVM CPUID leaves 0x400000xx */
- for (i = 0; i < cpuid_sys->nent; i++) {
- if (cpuid_sys->entries[i].function >= 0x40000000 &&
- cpuid_sys->entries[i].function < 0x40000100)
- continue;
- cpuid_full->entries[nent] = cpuid_sys->entries[i];
- nent++;
- }
-
- memcpy(&cpuid_full->entries[nent], cpuid_hv->entries,
- cpuid_hv->nent * sizeof(struct kvm_cpuid_entry2));
- cpuid_full->nent = nent + cpuid_hv->nent;
-
- return cpuid_full;
-}
-
int main(int argc, char *argv[])
{
vm_vaddr_t vmx_pages_gva = 0;
@@ -135,7 +99,7 @@ int main(int argc, char *argv[])
exit(KSFT_SKIP);
}
- vcpu_set_cpuid(vm, VCPU_ID, guest_get_cpuid());
+ vcpu_set_hv_cpuid(vm, VCPU_ID);
vcpu_enable_evmcs(vm, VCPU_ID);
run = vcpu_state(vm, VCPU_ID);
@@ -179,7 +143,7 @@ int main(int argc, char *argv[])
/* Restore state in a new VM. */
kvm_vm_restart(vm, O_RDWR);
vm_vcpu_add(vm, VCPU_ID);
- vcpu_set_cpuid(vm, VCPU_ID, guest_get_cpuid());
+ vcpu_set_hv_cpuid(vm, VCPU_ID);
vcpu_enable_evmcs(vm, VCPU_ID);
vcpu_load_state(vm, VCPU_ID, state);
run = vcpu_state(vm, VCPU_ID);
diff --git a/tools/testing/selftests/kvm/x86_64/xen_vmcall_test.c b/tools/testing/selftests/kvm/x86_64/xen_vmcall_test.c
index 6e7b069322fd..86653361c695 100644
--- a/tools/testing/selftests/kvm/x86_64/xen_vmcall_test.c
+++ b/tools/testing/selftests/kvm/x86_64/xen_vmcall_test.c
@@ -92,7 +92,7 @@ int main(int argc, char *argv[])
}
vm = vm_create_default(VCPU_ID, 0, (void *) guest_code);
- vcpu_set_cpuid(vm, VCPU_ID, kvm_get_supported_cpuid());
+ vcpu_set_hv_cpuid(vm, VCPU_ID);
struct kvm_xen_hvm_config hvmc = {
.flags = KVM_XEN_HVM_CONFIG_INTERCEPT_HCALL,
generated by cgit (git 2.34.1) at 2026-01-03 13:11:13 +0000