linux-kernel - [PATCH 01/10] KVM: x86 emulator: implement 'movnti mem, reg'

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Message-Id: <11965943273722-git-send-email-avi@qumranet.com>
Date:	Sun,  2 Dec 2007 13:18:38 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	stable@...nel.org
Cc:	linux-kernel@...r.kernel.org, kvm-devel@...ts.sourceforge.net,
	Sheng Yang <sheng.yang@...el.com>,
	Avi Kivity <avi@...ranet.com>
Subject: [PATCH 01/10] KVM: x86 emulator: implement 'movnti mem, reg'

From: Sheng Yang <sheng.yang@...el.com>

Implement emulation of instruction:
    movnti m32/m64, r32/r64
    opcode: 0x0f 0xc3

Needed to support Linux 2.6.16 as guest (used for mmio).

Signed-off-by: Sheng Yang <sheng.yang@...el.com>
Signed-off-by: Avi Kivity <avi@...ranet.com>
---
 drivers/kvm/x86_emulate.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/drivers/kvm/x86_emulate.c b/drivers/kvm/x86_emulate.c
index 4b8a0cc..804e86c 100644
--- a/drivers/kvm/x86_emulate.c
+++ b/drivers/kvm/x86_emulate.c
@@ -198,7 +198,8 @@ static u16 twobyte_table[256] = {
 	0, 0, ByteOp | DstReg | SrcMem | ModRM | Mov,
 	    DstReg | SrcMem16 | ModRM | Mov,
 	/* 0xC0 - 0xCF */
-	0, 0, 0, 0, 0, 0, 0, ImplicitOps | ModRM, 0, 0, 0, 0, 0, 0, 0, 0,
+	0, 0, 0, DstMem | SrcReg | ModRM | Mov, 0, 0, 0, ImplicitOps | ModRM,
+	0, 0, 0, 0, 0, 0, 0, 0,
 	/* 0xD0 - 0xDF */
 	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
 	/* 0xE0 - 0xEF */
@@ -1324,6 +1325,10 @@ twobyte_insn:
 		dst.bytes = op_bytes;
 		dst.val = (d & ByteOp) ? (s8) src.val : (s16) src.val;
 		break;
+	case 0xc3:		/* movnti */
+		dst.bytes = op_bytes;
+		dst.val = (op_bytes == 4) ? (u32) src.val : (u64) src.val;
+		break;
 	}
 	goto writeback;
 
-- 
1.5.3

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