From: Paolo Bonzini <pbonzini@redhat.com>
To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc: Nadav Amit <namit@cs.technion.ac.il>
Subject: [PATCH] KVM: x86: emulate: correct page fault error code for NoWrite instructions
Date: Mon, 9 Feb 2015 10:03:31 +0100 [thread overview]
Message-ID: <1423472611-5104-1-git-send-email-pbonzini@redhat.com> (raw)
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: c205fb7d7d4f81e46fc577b707ceb9e356af1456
Cc: Nadav Amit <namit@cs.technion.ac.il>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
arch/x86/kvm/emulate.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 81dcf7964701..a943bf0c06d0 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -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;
--
1.8.3.1
next reply other threads:[~2015-02-09 9:03 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-09 9:03 Paolo Bonzini [this message]
2015-02-11 0:56 ` Nadav Amit
2015-11-20 2:52 ` Wanpeng Li
2015-11-20 3:27 ` Wanpeng Li
2015-11-20 7:46 ` Nadav Amit
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