Generally, when Hyper-V emulation is enabled, VMM is supposed to set
Hyper-V CPUID identifications so the guest knows that Hyper-V features
are available. evmcs_test doesn't currently do that but so far Hyper-V
emulation in KVM was enabled unconditionally. As we are about to change
that, proper Hyper-V CPUID identification should be set in selftests as
well.
Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
---
.../testing/selftests/kvm/x86_64/evmcs_test.c | 39 ++++++++++++++++++-
1 file changed, 38 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/x86_64/evmcs_test.c b/tools/testing/selftests/kvm/x86_64/evmcs_test.c
index 37b8a78f6b74..39a3cb2bd103 100644
--- a/tools/testing/selftests/kvm/x86_64/evmcs_test.c
+++ b/tools/testing/selftests/kvm/x86_64/evmcs_test.c
@@ -78,6 +78,42 @@ 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;
@@ -99,6 +135,7 @@ int main(int argc, char *argv[])
exit(KSFT_SKIP);
}
+ vcpu_set_cpuid(vm, VCPU_ID, guest_get_cpuid());
vcpu_enable_evmcs(vm, VCPU_ID);
run = vcpu_state(vm, VCPU_ID);
@@ -142,7 +179,7 @@ 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, kvm_get_supported_cpuid());
+ vcpu_set_cpuid(vm, VCPU_ID, guest_get_cpuid());
vcpu_enable_evmcs(vm, VCPU_ID);
vcpu_load_state(vm, VCPU_ID, state);
run = vcpu_state(vm, VCPU_ID);
--
2.29.2
