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| author |  Paolo Bonzini <pbonzini@redhat.com>
| 2021-04-21 19:11:15 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com>
| 2021-04-26 05:27:15 -0400 |
| commit | d9db0fd6c5c9fa7c9a462a2c54d5e91455a74fca (patch) | |
| tree | 44ca9d2af91b6486a802b4f32d188f191f6b74e3 /arch/x86/kvm/reverse_cpuid.h | |
| parent | KVM: SVM: Move SEV module params/variables to sev.c (diff) | |
| download | linux-d9db0fd6c5c9fa7c9a462a2c54d5e91455a74fca.tar.gz linux-d9db0fd6c5c9fa7c9a462a2c54d5e91455a74fca.tar.bz2 linux-d9db0fd6c5c9fa7c9a462a2c54d5e91455a74fca.zip | |
KVM: SEV: Mask CPUID[0x8000001F].eax according to supported features
Add a reverse-CPUID entry for the memory encryption word, 0x8000001F.EAX,
and use it to override the supported CPUID flags reported to userspace.
Masking the reported CPUID flags avoids over-reporting KVM support, e.g.
without the mask a SEV-SNP capable CPU may incorrectly advertise SNP
support to userspace.
Clear SEV/SEV-ES if their corresponding module parameters are disabled,
and clear the memory encryption leaf completely if SEV is not fully
supported in KVM. Advertise SME_COHERENT in addition to SEV and SEV-ES,
as the guest can use SME_COHERENT to avoid CLFLUSH operations.
Explicitly omit SME and VM_PAGE_FLUSH from the reporting. These features
are used by KVM, but are not exposed to the guest, e.g. guest access to
related MSRs will fault.
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Cc: Brijesh Singh <brijesh.singh@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210422021125.3417167-6-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/reverse_cpuid.h')
| -rw-r--r-- | arch/x86/kvm/reverse_cpuid.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h index 8e0756ddab1a..a19d473d0184 100644 --- a/arch/x86/kvm/reverse_cpuid.h +++ b/arch/x86/kvm/reverse_cpuid.h @@ -47,6 +47,7 @@ static const struct cpuid_reg reverse_cpuid[] = { [CPUID_7_EDX] = { 7, 0, CPUID_EDX}, [CPUID_7_1_EAX] = { 7, 1, CPUID_EAX}, [CPUID_12_EAX] = {0x00000012, 0, CPUID_EAX}, + [CPUID_8000_001F_EAX] = {0x8000001f, 0, CPUID_EAX}, }; /* |