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| author | Sean Christopherson <seanjc@google.com> | 2021-05-04 20:17:24 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-05-07 13:06:16 +0300 |
| commit | 5104d7ffcf24749939bea7fdb5378d186473f890 (patch) | |
| tree | 4edd4687d7b6aa480446cd8d5942037fb203b141 /arch/x86/kvm/svm/svm.c | |
| parent | 2183de4161b90bd3851ccd3910c87b2c9adfc6ed (diff) | |
| download | linux-5104d7ffcf24749939bea7fdb5378d186473f890.tar.xz | |
KVM: VMX: Disable preemption when probing user return MSRs
Disable preemption when probing a user return MSR via RDSMR/WRMSR. If
the MSR holds a different value per logical CPU, the WRMSR could corrupt
the host's value if KVM is preempted between the RDMSR and WRMSR, and
then rescheduled on a different CPU.
Opportunistically land the helper in common x86, SVM will use the helper
in a future commit.
Fixes: 4be534102624 ("KVM: VMX: Initialize vmx->guest_msrs[] right after allocation")
Cc: stable@vger.kernel.org
Cc: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210504171734.1434054-6-seanjc@google.com>
Reviewed-by: Jim Mattson <jmattson@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