From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH 3/7] KVM: x86 emulator: introduce NoWrite flag Date: Sat, 22 Dec 2012 14:26:53 +0200 Message-ID: <1356179217-5526-4-git-send-email-avi.kivity@gmail.com> References: <1356179217-5526-1-git-send-email-avi.kivity@gmail.com> Cc: kvm@vger.kernel.org To: Marcelo Tosatti , Gleb Natapov Return-path: Received: from mail-wi0-f178.google.com ([209.85.212.178]:61454 "EHLO mail-wi0-f178.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751060Ab2LVMfK (ORCPT ); Sat, 22 Dec 2012 07:35:10 -0500 Received: by mail-wi0-f178.google.com with SMTP id hn3so3280336wib.5 for ; Sat, 22 Dec 2012 04:35:09 -0800 (PST) In-Reply-To: <1356179217-5526-1-git-send-email-avi.kivity@gmail.com> Sender: kvm-owner@vger.kernel.org List-ID: Instead of disabling writeback via OP_NONE, just specify NoWrite. Signed-off-by: Avi Kivity --- arch/x86/kvm/emulate.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c index 9859df6..9dfbd07 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -150,6 +150,7 @@ #define Unaligned ((u64)1 << 42) /* Explicitly unaligned (e.g. MOVDQU) */ #define Avx ((u64)1 << 43) /* Advanced Vector Extensions */ #define Fastop ((u64)1 << 44) /* Use opcode::u.fastop */ +#define NoWrite ((u64)1 << 45) /* No writeback */ #define X2(x...) x, x #define X3(x...) X2(x), x @@ -1584,6 +1585,9 @@ static int writeback(struct x86_emulate_ctxt *ctxt) { int rc; + if (ctxt->d & NoWrite) + return X86EMUL_CONTINUE; + switch (ctxt->dst.type) { case OP_REG: write_register_operand(&ctxt->dst); -- 1.7.11.7