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| author |   Sean Christopherson <seanjc@google.com> | 2022-06-14 20:06:47 +0000 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2022-07-13 18:14:16 -0700 |
| commit | c41880b5f040120fc27eb2305a0ab3f179c89f9a (patch) | |
| tree | 5706b98b5128d4d2eb8b45793f549589c5dfa3e1 /tools/testing/selftests/kvm/lib | |
| parent | KVM: selftests: Use get_cpuid_entry() in kvm_get_supported_cpuid_index() (diff) | |
| download | linux-dev-c41880b5f040120fc27eb2305a0ab3f179c89f9a.tar.xz linux-dev-c41880b5f040120fc27eb2305a0ab3f179c89f9a.zip | |
KVM: selftests: Add helpers to get and modify a vCPU's CPUID entries
Add helpers to get a specific CPUID entry for a given vCPU, and to toggle
a specific CPUID-based feature for a vCPU. The helpers will reduce the
amount of boilerplate code needed to tweak a vCPU's CPUID model, improve
code clarity, and most importantly move tests away from modifying the
static "cpuid" returned by kvm_get_supported_cpuid().
Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220614200707.3315957-23-seanjc@google.com
Diffstat (limited to 'tools/testing/selftests/kvm/lib')
| -rw-r--r-- | tools/testing/selftests/kvm/lib/x86_64/processor.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/tools/testing/selftests/kvm/lib/x86_64/processor.c b/tools/testing/selftests/kvm/lib/x86_64/processor.c index 5f359314a6ec..72aac618e0e4 100644 --- a/tools/testing/selftests/kvm/lib/x86_64/processor.c +++ b/tools/testing/selftests/kvm/lib/x86_64/processor.c @@ -766,6 +766,24 @@ void vcpu_init_cpuid(struct kvm_vcpu *vcpu, struct kvm_cpuid2 *cpuid) vcpu_set_cpuid(vcpu); } +void vcpu_set_or_clear_cpuid_feature(struct kvm_vcpu *vcpu, + struct kvm_x86_cpu_feature feature, + bool set) +{ + struct kvm_cpuid_entry2 *entry; + u32 *reg; + + entry = __vcpu_get_cpuid_entry(vcpu, feature.function, feature.index); + reg = (&entry->eax) + feature.reg; + + if (set) + *reg |= BIT(feature.bit); + else + *reg &= ~BIT(feature.bit); + + vcpu_set_cpuid(vcpu); +} + uint64_t vcpu_get_msr(struct kvm_vcpu *vcpu, uint64_t msr_index) { struct { |