From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: [PATCH v3 3/7] KVM: x86 emulator: introduce NoWrite flag Date: Fri, 4 Jan 2013 16:18:50 +0200 Message-ID: <1357309134-11944-4-git-send-email-avi.kivity@gmail.com> References: <1357309134-11944-1-git-send-email-avi.kivity@gmail.com> Cc: kvm@vger.kernel.org To: Marcelo Tosatti , Gleb Natapov Return-path: Received: from mail-wi0-f172.google.com ([209.85.212.172]:51316 "EHLO mail-wi0-f172.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754844Ab3ADOTE (ORCPT ); Fri, 4 Jan 2013 09:19:04 -0500 Received: by mail-wi0-f172.google.com with SMTP id o1so11660348wic.11 for ; Fri, 04 Jan 2013 06:19:03 -0800 (PST) In-Reply-To: <1357309134-11944-1-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 42c53c8..fe113fb 100644 --- a/arch/x86/kvm/emulate.c +++ b/arch/x86/kvm/emulate.c @@ -151,6 +151,7 @@ #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 @@ -1633,6 +1634,9 @@ 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); -- 1.8.0.1