Commit 3098c076c83e for kernel
commit 3098c076c83ea2913245cb915cdcba98eb24214c
Author: Sean Christopherson <seanjc@google.com>
Date: Wed May 6 14:35:14 2026 -0700
KVM: x86: Swap the dst and src operand for MOVNTDQA
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@google.com>
Fixes: c57d9bafbd0b ("KVM: x86: Add support for emulating MOVNTDQA")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20260506213514.2781948-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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 */