KVM: x86: Ignore benign host accesses to "unsupported" PEBS and BTS MSRs

Browse source

Ignore host userspace reads and writes of '0' to PEBS and BTS MSRs that
KVM reports in the MSR-to-save list, but the MSRs are ultimately
unsupported.  All MSRs in said list must be writable by userspace, e.g.
if userspace sends the list back at KVM without filtering out the MSRs it
doesn't need.

Fixes: 8183a538cd ("KVM: x86/pmu: Add IA32_DS_AREA MSR emulation to support guest DS")
Fixes: 902caeb684 ("KVM: x86/pmu: Add PEBS_DATA_CFG MSR emulation to support adaptive PEBS")
Fixes: c59a1f106f ("KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS")
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220611005755.753273-7-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

...

This commit is contained in:

Sean Christopherson 2022-06-11 00:57:54 +00:00 • committed by Paolo Bonzini

parent 3f7999b988

commit 157fc497b5

1 changed files with 17 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

17

arch/x86/kvm/x86.c

View file