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KVM: x86: Swap the dst and src operand for MOVNTDQA

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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: c57d9bafbd ("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>
This commit is contained in:
Sean Christopherson
2026-05-06 14:35:14 -07:00
committed by Paolo Bonzini
parent 6b72d0578c
commit 3098c076c8
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/emulate.c
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@@ -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 */