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| author | Sean Christopherson <seanjc@google.com> | 2021-05-04 10:17:21 -0700 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-05-07 06:06:15 -0400 |
| commit | 85d0011264da24be08ae907d7f29983a597ca9b1 (patch) | |
| tree | 337769183d8aad311c142ecef9eee3bbecb36225 /arch/x86/kvm/svm/svm.c | |
| parent | 8aec21c04caa2000f91cf8822ae0811e4b0c3971 (diff) | |
| download | lwn-85d0011264da24be08ae907d7f29983a597ca9b1.tar.gz lwn-85d0011264da24be08ae907d7f29983a597ca9b1.zip | |
KVM: x86: Emulate RDPID only if RDTSCP is supported
Do not advertise emulation support for RDPID if RDTSCP is unsupported.
RDPID emulation subtly relies on MSR_TSC_AUX to exist in hardware, as
both vmx_get_msr() and svm_get_msr() will return an error if the MSR is
unsupported, i.e. ctxt->ops->get_msr() will fail and the emulator will
inject a #UD.
Note, RDPID emulation also relies on RDTSCP being enabled in the guest,
but this is a KVM bug and will eventually be fixed.
Fixes: fb6d4d340e05 ("KVM: x86: emulate RDPID")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210504171734.1434054-3-seanjc@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
0 files changed, 0 insertions, 0 deletions