KVM: nSVM: Check the value written to MSR_VM_HSAVE_PA

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APM states that #GP is raised upon write to MSR_VM_HSAVE_PA when
the supplied address is not page-aligned or is outside of "maximum
supported physical address for this implementation".
page_address_valid() check seems suitable. Also, forcefully page-align
the address when it's written from VMM.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20210628104425.391276-2-vkuznets@redhat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
[Add comment about behavior for host-provided values. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Vitaly Kuznetsov 2021-06-28 12:44:20 +02:00 • committed by Paolo Bonzini

parent c7a1b2b678

commit fce7e152ff

1 changed files with 10 additions and 1 deletions

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arch/x86/kvm/svm/svm.c

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