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Date: Thu, 8 Apr 2021 13:43:03 +0200
From: Emanuele Giuseppe Esposito <eesposit@...hat.com>
To: kvm@...r.kernel.org
Cc: Paolo Bonzini <pbonzini@...hat.com>,
Jonathan Corbet <corbet@....net>,
Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Emanuele Giuseppe Esposito <eesposit@...hat.com>,
Jim Mattson <jmattson@...gle.com>,
Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
"H. Peter Anvin" <hpa@...or.com>, Shuah Khan <shuah@...nel.org>,
Alexander Graf <graf@...zon.com>,
Andrew Jones <drjones@...hat.com>, linux-doc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: [PATCH v4 4/4] selftests: KVM: extend get_cpuid_test to include KVM_GET_EMULATED_CPUID
Extend the get_cpuid_test.c selftest to include the KVM_GET_EMULATED_CPUID
ioctl. Since the behavior and functionality is similar to
KVM_GET_SUPPORTED_CPUID, we only check additionally:
1) checks for corner case in the nent field of the struct kvm_cpuid2.
2) sets and gets it as cpuid from the guest VM
Signed-off-by: Emanuele Giuseppe Esposito <eesposit@...hat.com>
---
.../selftests/kvm/x86_64/get_cpuid_test.c | 90 ++++++++++++++++++-
1 file changed, 88 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/kvm/x86_64/get_cpuid_test.c b/tools/testing/selftests/kvm/x86_64/get_cpuid_test.c
index 9b78e8889638..b9f0fba1b0ea 100644
--- a/tools/testing/selftests/kvm/x86_64/get_cpuid_test.c
+++ b/tools/testing/selftests/kvm/x86_64/get_cpuid_test.c
@@ -13,6 +13,7 @@
#include "processor.h"
#define VCPU_ID 0
+#define MAX_NENT 1000
/* CPUIDs known to differ */
struct {
@@ -137,7 +138,8 @@ static void run_vcpu(struct kvm_vm *vm, uint32_t vcpuid, int stage)
}
}
-struct kvm_cpuid2 *vcpu_alloc_cpuid(struct kvm_vm *vm, vm_vaddr_t *p_gva, struct kvm_cpuid2 *cpuid)
+static struct kvm_cpuid2 *vcpu_alloc_cpuid(struct kvm_vm *vm, vm_vaddr_t *p_gva,
+ struct kvm_cpuid2 *cpuid)
{
int size = sizeof(*cpuid) + cpuid->nent * sizeof(cpuid->entries[0]);
vm_vaddr_t gva = vm_vaddr_alloc(vm, size,
@@ -150,9 +152,84 @@ struct kvm_cpuid2 *vcpu_alloc_cpuid(struct kvm_vm *vm, vm_vaddr_t *p_gva, struct
return guest_cpuids;
}
+static struct kvm_cpuid2 *alloc_custom_kvm_cpuid2(int nent)
+{
+ struct kvm_cpuid2 *cpuid;
+ size_t size;
+
+ size = sizeof(*cpuid);
+ size += nent * sizeof(struct kvm_cpuid_entry2);
+ cpuid = calloc(1, size);
+ if (!cpuid) {
+ perror("malloc");
+ abort();
+ }
+
+ cpuid->nent = nent;
+
+ return cpuid;
+}
+
+static void clean_entries_kvm_cpuid2(struct kvm_cpuid2 *cpuid)
+{
+ size_t size;
+ int old_nent = cpuid->nent;
+
+ size = sizeof(*cpuid);
+ size += MAX_NENT * sizeof(struct kvm_cpuid_entry2);
+ memset(cpuid, 0, size);
+ cpuid->nent = old_nent;
+}
+
+static void test_emulated_entries(struct kvm_vm *vm)
+{
+ int res, right_nent;
+ struct kvm_cpuid2 *cpuid;
+
+ cpuid = alloc_custom_kvm_cpuid2(MAX_NENT);
+
+ /* 0 nent, return E2BIG */
+ cpuid->nent = 0;
+ res = _kvm_ioctl(vm, KVM_GET_EMULATED_CPUID, cpuid);
+ TEST_ASSERT(res == -1 && errno == E2BIG, "nent=0 should fail as E2BIG");
+ clean_entries_kvm_cpuid2(cpuid);
+
+ /* high nent, set the entries and adjust */
+ cpuid->nent = MAX_NENT;
+ res = _kvm_ioctl(vm, KVM_GET_EMULATED_CPUID, cpuid);
+ TEST_ASSERT(res == 0, "nent > actual nent should not fail");
+ right_nent = cpuid->nent;
+ clean_entries_kvm_cpuid2(cpuid);
+
+ /* high nent, set the entries and adjust */
+ cpuid->nent++;
+ res = _kvm_ioctl(vm, KVM_GET_EMULATED_CPUID, cpuid);
+ TEST_ASSERT(res == 0, "nent > actual nent should not fail");
+ TEST_ASSERT(right_nent == cpuid->nent, "nent should be always the same");
+ clean_entries_kvm_cpuid2(cpuid);
+
+ /* low nent, return E2BIG */
+ if (right_nent > 1) {
+ cpuid->nent = 1;
+ res = _kvm_ioctl(vm, KVM_GET_EMULATED_CPUID, cpuid);
+ TEST_ASSERT(res == -1 && errno == E2BIG, "nent=1 should fail");
+ clean_entries_kvm_cpuid2(cpuid);
+ }
+
+ /* exact nent */
+ cpuid->nent = right_nent;
+ res = _kvm_ioctl(vm, KVM_GET_EMULATED_CPUID, cpuid);
+ TEST_ASSERT(res == 0, "nent == actual nent should not fail");
+ TEST_ASSERT(cpuid->nent == right_nent,
+ "KVM_GET_EMULATED_CPUID should be invaried when nent is exact");
+ clean_entries_kvm_cpuid2(cpuid);
+
+ free(cpuid);
+}
+
int main(void)
{
- struct kvm_cpuid2 *supp_cpuid, *cpuid2;
+ struct kvm_cpuid2 *supp_cpuid, *emul_cpuid, *cpuid2;
vm_vaddr_t cpuid_gva;
struct kvm_vm *vm;
int stage;
@@ -171,5 +248,14 @@ int main(void)
for (stage = 0; stage < 3; stage++)
run_vcpu(vm, VCPU_ID, stage);
+ if (kvm_check_cap(KVM_CAP_EXT_EMUL_CPUID)) {
+ emul_cpuid = kvm_get_emulated_cpuid();
+ vcpu_set_cpuid(vm, VCPU_ID, emul_cpuid);
+ cpuid2 = vcpu_get_cpuid(vm, VCPU_ID);
+
+ test_emulated_entries(vm);
+ compare_cpuids(emul_cpuid, cpuid2);
+ }
+
kvm_vm_free(vm);
}
--
2.30.2
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