kvm: Handle reads of SandyBridge RAPL PMU MSRs rather than injecting #GP

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Linux 3.14 unconditionally reads the RAPL PMU MSRs on boot, without handling
General Protection Faults on reading those MSRs. Rather than injecting a #GP,
which prevents boot, handle the MSRs by returning 0 for their data. Zero was
checked to be safe by code review of the RAPL PMU driver and in discussion
with the original driver author (eranian@google.com).

Signed-off-by: Venkatesh Srinivas <venkateshs@google.com>
Signed-off-by: Jon Cargille <jcargill@google.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Message-Id: <20200416184254.248374-1-jcargill@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Venkatesh Srinivas 2020-04-16 11:42:54 -07:00 • committed by Paolo Bonzini

parent 7289fdb5dc

commit 2ca1a06a54

1 changed files with 11 additions and 0 deletions

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arch/x86/kvm/x86.c

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