[RFC,v6,80/92] kvm: x86: emulate movss xmm, m32
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Message ID 20190809160047.8319-81-alazar@bitdefender.com
State New
Headers show
Series
  • VM introspection
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Commit Message

Adalbert Lazăr Aug. 9, 2019, 4 p.m. UTC
From: Mihai Donțu <mdontu@bitdefender.com>

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

Signed-off-by: Mihai Donțu <mdontu@bitdefender.com>
Signed-off-by: Adalbert Lazăr <alazar@bitdefender.com>
---
 arch/x86/kvm/emulate.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

Patch
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diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 9d38f892beea..b8a412b8b087 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -1184,9 +1184,13 @@  static u8 simd_prefix_to_bytes(const struct x86_emulate_ctxt *ctxt,
 
 	switch (ctxt->b) {
 	case 0x11:
+		/* movss xmm, m32 */
 		/* movsd xmm, m64 */
 		/* movups xmm, m128 */
-		if (simd_prefix == 0xf2) {
+		if (simd_prefix == 0xf3) {
+			bytes = 4;
+			break;
+		} else if (simd_prefix == 0xf2) {
 			bytes = 8;
 			break;
 		}
@@ -4550,7 +4554,7 @@  static const struct gprefix pfx_0f_2b = {
 };
 
 static const struct gprefix pfx_0f_10_0f_11 = {
-	I(Unaligned, em_mov), I(Unaligned, em_mov), I(Unaligned, em_mov), N,
+	I(Unaligned, em_mov), I(Unaligned, em_mov), I(Unaligned, em_mov), I(Unaligned, em_mov),
 };
 
 static const struct gprefix pfx_0f_28_0f_29 = {