path: root/arch/s390
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authorPaolo Bonzini <pbonzini@redhat.com>2020-02-05 16:10:52 +0100
committerPaolo Bonzini <pbonzini@redhat.com>2020-02-05 16:12:57 +0100
commitdf7e8818926eb4712b67421442acf7d568fe2645 (patch)
tree7eb436326517e289dcb475d119933faace074c97 /arch/s390
parentKVM: x86: Fix perfctr WRMSR for running counters (diff)
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')
0 files changed, 0 insertions, 0 deletions