kvm/svm: PKU not currently supported

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commit a47970ed74 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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John Allen 2019-12-19 14:17:59 -06:00 • committed by Greg Kroah-Hartman

parent 18eebcc7b3

commit b4daeb0097

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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