[PATCH v2] KVM: x86: Swap the dst and src operand for MOVNTDQA
From: Sean Christopherson
Date: Wed May 06 2026 - 17:35:28 EST
Swap the MOVNTDQA operands, as MOVNTDQA does NOT in fact have "the same
characteristics as 0F E7 (MOVNTDQ)"; MOVNTDQA loads from memory and stores
to registers, while MOVNTDQ loads from registers and stores to memory.
Per the SDM:
MOVNTDQ - Move packed integer values in xmm1 to m128 using non-temporal
hint.
MOVNTDQA - Move double quadword from m128 to xmm1 using non-temporal hint
if WC memory type.
Reported-by: Josh Eads <josheads@xxxxxxxxxx>
Fixes: c57d9bafbd0b ("KVM: x86: Add support for emulating MOVNTDQA")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
v2: Suck less. [Josh]
v1: https://lore.kernel.org/all/20260506185510.2723091-1-seanjc@xxxxxxxxxx
arch/x86/kvm/emulate.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index c8c6cc0406d6..8013dccb3110 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -4481,7 +4481,7 @@ static const struct opcode opcode_map_0f_38[256] = {
X16(N), X16(N),
/* 0x20 - 0x2f */
X8(N),
- X2(N), GP(SrcReg | DstMem | ModRM | Mov | Aligned, &pfx_0f_e7_0f_38_2a), N, N, N, N, N,
+ X2(N), GP(SrcMem | DstReg | ModRM | Mov | Aligned, &pfx_0f_e7_0f_38_2a), N, N, N, N, N,
/* 0x30 - 0x7f */
X16(N), X16(N), X16(N), X16(N), X16(N),
/* 0x80 - 0xef */
base-commit: 6d35786de28116ecf78797a62b84e6bf3c45aa5a
--
2.54.0.545.g6539524ca2-goog