0023-x86emul-set-fake-operand-size-for-AVX512CD-broadcast.patch


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35

From a0d6b75b832d2f7c54429de1a550fe122bcd6881 Mon Sep 17 00:00:00 2001
From: Jan Beulich <jbeulich@suse.com>
Date: Tue, 24 Sep 2024 14:37:52 +0200
Subject: [PATCH 23/35] x86emul: set (fake) operand size for AVX512CD broadcast
 insns

Back at the time I failed to pay attention to op_bytes still being 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-prefixed insns.

Fixes: 37ccca740c26 ("x86emul: support AVX512CD insns")
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Acked-by: Andrew Cooper <andrew.cooper3@citrix.com>
master commit: 6fa6b7feaafd622db3a2f3436750cf07782f4c12
master date: 2024-08-23 09:12:24 +0200
---
 xen/arch/x86/x86_emulate/x86_emulate.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/xen/arch/x86/x86_emulate/x86_emulate.c b/xen/arch/x86/x86_emulate/x86_emulate.c
index 4d9649a2af..305f4286bf 100644
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -5928,6 +5928,7 @@ x86_emulate(
                                evex.w == ((b >> 4) & 1)),
                               X86_EXC_UD);
         d |= TwoOp;
+        op_bytes = 1; /* fake */
         /* fall through */
     case X86EMUL_OPC_EVEX_66(0x0f38, 0xc4): /* vpconflict{d,q} [xyz]mm/mem,[xyz]mm{k} */
         fault_suppression = false;
-- 
2.46.1