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[PATCH] x86emul: always set operand size for AVX-VNNI-INT8 insns
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 21 Aug 2024 11:26:57 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 21 Aug 2024 09:27:24 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Unlike for AVX-VNNI-INT16 I missed to notice that op_bytes may still be
zero when reaching the respective case block: With the ext0f38_table[]
entries having simd_packed_int, the defaulting at the bottom of
x86emul_decode() won't set the field to non-zero for F3- or F2-prefixed
insns.
Fixes: 842acaa743a5 ("x86emul: support AVX-VNNI-INT8")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -6075,6 +6075,7 @@ x86_emulate(
case X86EMUL_OPC_VEX_F2(0x0f38, 0x51): /* vpdpbssds
[xy]mm/mem,[xy]mm,[xy]mm */
host_and_vcpu_must_have(avx_vnni_int8);
generate_exception_if(vex.w, X86_EXC_UD);
+ op_bytes = 16 << vex.l;
goto simd_0f_ymm;
case X86EMUL_OPC_VEX_66(0x0f38, 0x50): /* vpdpbusd
[xy]mm/mem,[xy]mm,[xy]mm */
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