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| author | Sean Christopherson <seanjc@google.com> | 2024-08-02 11:55:04 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2024-11-01 09:22:30 -0700 |
| commit | bc2ca3680b30869ee9a764ab72c143070f1afec8 (patch) | |
| tree | beb916757b4aad1851ee4f81b966a625016db1ed /arch/x86/kvm | |
| parent | 2142ac663a6a72ac868d0768681b1355e3a703eb (diff) | |
| download | lwn-bc2ca3680b30869ee9a764ab72c143070f1afec8.tar.gz lwn-bc2ca3680b30869ee9a764ab72c143070f1afec8.zip | |
KVM: x86: Disallow changing MSR_PLATFORM_INFO after vCPU has run
Tag MSR_PLATFORM_INFO as a feature MSR (because it is), i.e. disallow it
from being modified after the vCPU has run.
To make KVM's selftest compliant, simply delete the userspace MSR write
that restores KVM's original value at the end of the test. Verifying that
userspace can write back what it originally read is uninteresting in this
particular case, because KVM doesn't enforce _any_ bits in the MSR, i.e.
userspace should be able to write any arbitrary value.
Link: https://lore.kernel.org/r/20240802185511.305849-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/x86.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 3787e6a71743..16804637ba97 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -451,6 +451,7 @@ static const u32 msr_based_features_all_except_vmx[] = { MSR_IA32_UCODE_REV, MSR_IA32_ARCH_CAPABILITIES, MSR_IA32_PERF_CAPABILITIES, + MSR_PLATFORM_INFO, }; static u32 msr_based_features[ARRAY_SIZE(msr_based_features_all_except_vmx) + |