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957d0f70e9
Zero out the LBR capabilities during PMU refresh to avoid exposing LBRs to the guest against userspace's wishes. If userspace modifies the guest's CPUID model or invokes KVM_CAP_PMU_CAPABILITY to disable vPMU after an initial KVM_SET_CPUID2, but before the first KVM_RUN, KVM will retain the previous LBR info due to bailing before refreshing the LBR descriptor. Note, this is a very theoretical bug, there is no known use case where a VMM would deliberately enable the vPMU via KVM_SET_CPUID2, and then later disable the vPMU. Link: https://lore.kernel.org/r/20230311004618.920745-9-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com> |
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