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kvm: nVMX: Check "load IA32_PAT" VM-entry control on vmentry

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According to section "Checking and Loading Guest State" in Intel SDM vol
3C, the following check is performed on vmentry:

    If the "load IA32_PAT" VM-entry control is 1, the value of the field
    for the IA32_PAT MSR must be one that could be written by WRMSR
    without fault at CPL 0. Specifically, each of the 8 bytes in the
    field must have one of the values 0 (UC), 1 (WC), 4 (WT), 5 (WP),
    6 (WB), or 7 (UC-).

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@oracle.com>
Reviewed-by: Karl Heubaum <karl.heubaum@oracle.com>
Suggested-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Krish Sadhukhan
2019-04-08 17:35:12 -04:00
committed by Paolo Bonzini
parent f6b0db1fda
commit de2bc2bfdf
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/vmx/nested.c
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@@ -2696,6 +2696,10 @@ static int nested_vmx_check_vmentry_postreqs(struct kvm_vcpu *vcpu,
!nested_guest_cr4_valid(vcpu, vmcs12->guest_cr4))
return 1;
if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT) &&
!kvm_pat_valid(vmcs12->guest_ia32_pat))
return 1;
if (nested_vmx_check_vmcs_link_ptr(vcpu, vmcs12)) {
*exit_qual = ENTRY_FAIL_VMCS_LINK_PTR;
return 1;