KVM: x86/mmu: Invert RET_PF_* check when falling through to emulation

Explicitly check for RET_PF_EMULATE instead of implicitly doing the same
by checking for !RET_PF_RETRY (RET_PF_INVALID is handled earlier).  This
will adding new RET_PF_ types in future patches without breaking the
emulation path.

No functional change intended.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Message-Id: <20200923220425.18402-3-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index 68c0a1a..0831e88 100644 (file)
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5466,10 +5466,10 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
                        return -EIO;
        }
 
-       if (r == RET_PF_RETRY)
-               return 1;
        if (r < 0)
                return r;
+       if (r != RET_PF_EMULATE)
+               return 1;
 
        /*
         * Before emulating the instruction, check if the error code