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KVM: nSVM: Check that DR6[63:32] and DR7[64:32] are not set on vmrun of nested guests 

According to section "Canonicalization and Consistency Checks" in APM vol. 2
the following guest state is illegal:

    "DR6[63:32] are not zero."
    "DR7[63:32] are not zero."
    "Any MBZ bit of EFER is set."

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Message-Id: <20200522221954.32131-3-krish.sadhukhan@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Krish Sadhukhan 2020-05-22 18:19:52 -04:00 committed by Paolo Bonzini
parent f5f6145e41
commit 1aef8161b3
1 changed files with 3 additions and 0 deletions
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arch/x86/kvm/svm/nested.c
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@ -231,6 +231,9 @@ static bool nested_vmcb_checks(struct vmcb *vmcb)
(vmcb->save.cr0 & X86_CR0_NW))
return false;
if (!kvm_dr6_valid(vmcb->save.dr6) || !kvm_dr7_valid(vmcb->save.dr7))
return false;
return nested_vmcb_check_controls(&vmcb->control);
}