[PATCH 3/4] selftests: add kvm_get_emulated_cpuid

From: Emanuele Giuseppe Esposito
Date: Tue Mar 30 2021 - 15:00:14 EST


As the similar kvm_get_supported_cpuid, allocates and gets
the struct kvm_cpuid2 filled with emulated features.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@xxxxxxxxxx>
---
.../selftests/kvm/include/x86_64/processor.h | 1 +
.../selftests/kvm/lib/x86_64/processor.c | 33 +++++++++++++++++++
2 files changed, 34 insertions(+)

diff --git a/tools/testing/selftests/kvm/include/x86_64/processor.h b/tools/testing/selftests/kvm/include/x86_64/processor.h
index 0b30b4e15c38..ae1b9530e187 100644
--- a/tools/testing/selftests/kvm/include/x86_64/processor.h
+++ b/tools/testing/selftests/kvm/include/x86_64/processor.h
@@ -353,6 +353,7 @@ void vcpu_load_state(struct kvm_vm *vm, uint32_t vcpuid,
struct kvm_msr_list *kvm_get_msr_index_list(void);
uint64_t kvm_get_feature_msr(uint64_t msr_index);
struct kvm_cpuid2 *kvm_get_supported_cpuid(void);
+struct kvm_cpuid2 *kvm_get_emulated_cpuid(void);

struct kvm_cpuid2 *vcpu_get_cpuid(struct kvm_vm *vm, uint32_t vcpuid);
void vcpu_set_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 e676fe40bfe6..2ea14421bdfe 100644
--- a/tools/testing/selftests/kvm/lib/x86_64/processor.c
+++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c
@@ -669,6 +669,39 @@ struct kvm_cpuid2 *kvm_get_supported_cpuid(void)
return cpuid;
}

+/*
+ * KVM Emulated CPUID Get
+ *
+ * Input Args: None
+ *
+ * Output Args:
+ *
+ * Return: The emulated KVM CPUID
+ *
+ * Get the guest CPUID emulated by KVM.
+ */
+struct kvm_cpuid2 *kvm_get_emulated_cpuid(void)
+{
+ static struct kvm_cpuid2 *cpuid;
+ int ret;
+ int kvm_fd;
+
+ if (cpuid)
+ return cpuid;
+
+ cpuid = allocate_kvm_cpuid2();
+ kvm_fd = open(KVM_DEV_PATH, O_RDONLY);
+ if (kvm_fd < 0)
+ exit(KSFT_SKIP);
+
+ ret = ioctl(kvm_fd, KVM_GET_EMULATED_CPUID, cpuid);
+ TEST_ASSERT(ret == 0, "KVM_GET_EMULATED_CPUID failed %d %d\n",
+ ret, errno);
+
+ close(kvm_fd);
+ return cpuid;
+}
+
/*
* KVM Get MSR
*
--
2.30.2