KVM: nVMX: Fix erroneous exception bitmap check

(cherry picked from commit 9587190107d0c0cbaccbf7bf6b0245d29095a9ae)

The code which checks whether to inject a pagefault to L1 or L2 (in
nested VMX) was wrong, incorrect in how it checked the PF_VECTOR bit.
Thanks to Dan Carpenter for spotting this.

Signed-off-by: Nadav Har'El <nyh@il.ibm.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index fafb3256ea5e5af6bc37e9f28e7e3a9c32fee9da..5d1b0c75fffab8932d538dc3e0eb392b1d8944cb 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -1678,7 +1678,7 @@ static int nested_pf_handled(struct kvm_vcpu *vcpu)
        struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
 
        /* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */
-       if (!(vmcs12->exception_bitmap & PF_VECTOR))
+       if (!(vmcs12->exception_bitmap & (1u << PF_VECTOR)))
                return 0;
 
        nested_vmx_vmexit(vcpu);