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| author |   Paolo Bonzini <pbonzini@redhat.com> | 2020-02-05 16:10:52 +0100 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-02-05 16:12:57 +0100 |
| commit | df7e8818926eb4712b67421442acf7d568fe2645 (patch) | |
| tree | 7eb436326517e289dcb475d119933faace074c97 /arch/s390/kvm/interrupt.c | |
| parent | KVM: x86: Fix perfctr WRMSR for running counters (diff) | |
| download | linux-dev-df7e8818926eb4712b67421442acf7d568fe2645.tar.xz linux-dev-df7e8818926eb4712b67421442acf7d568fe2645.zip | |
KVM: SVM: relax conditions for allowing MSR_IA32_SPEC_CTRL accesses
Userspace that does not know about the AMD_IBRS bit might still
allow the guest to protect itself with MSR_IA32_SPEC_CTRL using
the Intel SPEC_CTRL bit. However, svm.c disallows this and will
cause a #GP in the guest when writing to the MSR. Fix this by
loosening the test and allowing the Intel CPUID bit, and in fact
allow the AMD_STIBP bit as well since it allows writing to
MSR_IA32_SPEC_CTRL too.
Reported-by: Zhiyi Guo <zhguo@redhat.com>
Analyzed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Analyzed-by: Laszlo Ersek <lersek@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/s390/kvm/interrupt.c')
0 files changed, 0 insertions, 0 deletions