KVM: introduce module parameter for ignoring unknown MSRs accesses

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KVM will inject a #GP into the guest if that tries to access unhandled
MSRs. This will crash many guests. Although it would be the correct
way to actually handle these MSRs, we introduce a runtime switchable
module param called "ignore_msrs" (defaults to 0). If this is Y, unknown
MSR reads will return 0, while MSR writes are simply dropped. In both cases
we print a message to dmesg to inform the user about that.

You can change the behaviour at any time by saying:

 # echo 1 > /sys/modules/kvm/parameters/ignore_msrs

Signed-off-by: Andre Przywara <andre.przywara@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>

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Andre Przywara 2009-06-25 12:36:49 +02:00 • committed by Avi Kivity

parent 1fdbd48c24

commit ed85c06853

1 changed files with 20 additions and 4 deletions

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arch/x86/kvm/x86.c

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