[RFC,v6,83/92] kvm: x86: emulate movd xmm, m32

Commit Message

Adalbert Lazăr Aug. 9, 2019, 4 p.m. UTC

From: Mihai Donțu <[e-mail]>

This is needed in order to be able to support guest code that uses movd to
write into pages that are marked for write tracking.

Signed-off-by: Mihai Donțu <[e-mail]>
Signed-off-by: Adalbert Lazăr <[e-mail]>
---
 arch/x86/kvm/emulate.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

Patch

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 7c79504e58cd..b42a71653622 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1203,6 +1203,11 @@  static u8 simd_prefix_to_bytes(const struct x86_emulate_ctxt *ctxt,
 		if (simd_prefix == 0x66)
 			bytes = 8;
 		break;
+	case 0x7e:
+		/* movd xmm, m32 */
+		if (simd_prefix == 0x66)
+			bytes = 4;
+		break;
 	default:
 		break;
 	}
@@ -4564,6 +4569,10 @@  static const struct gprefix pfx_0f_d6 = {
 	N, I(0, em_mov), N, N,
 };
 
+static const struct gprefix pfx_0f_7e = {
+	N, I(0, em_mov), N, N,
+};
+
 static const struct gprefix pfx_0f_2b = {
 	ID(0, &instr_dual_0f_2b), ID(0, &instr_dual_0f_2b), N, N,
 };
@@ -4823,7 +4832,8 @@  static const struct opcode twobyte_table[256] = {
 	N, N, N, N,
 	N, N, N, N,
 	N, N, N, N,
-	N, N, N, GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
+	N, N, GP(ModRM | SrcReg | DstMem | GPRModRM | Mov | Sse, &pfx_0f_7e),
+	GP(SrcReg | DstMem | ModRM | Mov, &pfx_0f_6f_0f_7f),
 	/* 0x80 - 0x8F */
 	X16(D(SrcImm | NearBranch)),
 	/* 0x90 - 0x9F */