kvm/svm: PKU not currently supported

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Current SVM implementation does not have support for handling PKU. Guests
running on a host with future AMD cpus that support the feature will read
garbage from the PKRU register and will hit segmentation faults on boot as
memory is getting marked as protected that should not be. Ensure that cpuid
from SVM does not advertise the feature.

Signed-off-by: John Allen <john.allen@amd.com>
Cc: stable@vger.kernel.org
Fixes: 0556cbdc2f ("x86/pkeys: Don't check if PKRU is zero before writing it")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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John Allen 2019-12-19 14:17:59 -06:00 • committed by Paolo Bonzini

parent 8bd826d629

commit a47970ed74

5 changed files with 16 additions and 1 deletions

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1

arch/x86/include/asm/kvm_host.h

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4

arch/x86/kvm/cpuid.c

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arch/x86/kvm/svm.c

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arch/x86/kvm/vmx/capabilities.h

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arch/x86/kvm/vmx/vmx.c

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