KVM: x86: emulate: correct page fault error code for NoWrite instructions



NoWrite instructions (e.g. cmp or test) never set the "write access"
bit in the error code, even if one of the operands is treated as a
destination.

Fixes: c205fb7d
Cc: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

parent ccd9e785

arch/x86/kvm/emulate.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -4954,7 +4954,8 @@ int x86_emulate_insn(struct x86_emulate_ctxt *ctxt)
		rc = segmented_read(ctxt, ctxt->dst.addr.mem,
		&ctxt->dst.val, ctxt->dst.bytes);
		if (rc != X86EMUL_CONTINUE) {
		if (rc == X86EMUL_PROPAGATE_FAULT &&
		if (!(ctxt->d & NoWrite) &&
		rc == X86EMUL_PROPAGATE_FAULT &&
		ctxt->exception.vector == PF_VECTOR)
		ctxt->exception.error_code \|= PFERR_WRITE_MASK;
		goto done;