Messages in this thread Patch in this message | | | From | Wanpeng Li <> | Subject | [PATCH v2 2/2] KVM: nVMX: Validate the IA32_BNDCFGS on nested VM-entry | Date | Fri, 27 Oct 2017 01:36:49 -0700 |
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From: Wanpeng Li <wanpeng.li@hotmail.com>
According to the SDM, if the "load IA32_BNDCFGS" VM-entry controls is 1, the following checks are performed on the field for the IA32_BNDCFGS MSR: - Bits reserved in the IA32_BNDCFGS MSR must be 0. - The linear address in bits 63:12 must be canonical.
Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Radim Krčmář <rkrcmar@redhat.com> Cc: Jim Mattson <jmattson@google.com> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com> --- arch/x86/kvm/vmx.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index e6c8ffa..f29f57d 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -10805,6 +10805,13 @@ static int check_vmentry_postreqs(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12, return 1; } + if (kvm_mpx_supported() && + (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_BNDCFGS)) { + if (is_noncanonical_address(vmcs12->guest_bndcfgs & PAGE_MASK, vcpu) || + (vmcs12->guest_bndcfgs & MSR_IA32_BNDCFGS_RSVD)) + return 1; + } + return 0; } -- 2.7.4
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