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Wed, 10 Dec 2025 05:16:59 -0800 (PST) X-Google-Smtp-Source: AGHT+IGNW+qqJUUS7i4wTIMn/+LMzIOafvXr0U4T7pmvj4NuoJG3Z6UXTqm4jsrvH/OTFQzGEWZ0RQ== X-Received: by 2002:a05:6000:4023:b0:42c:b8fd:21bb with SMTP id ffacd0b85a97d-42fa3af8bebmr2607678f8f.39.1765372619040; Wed, 10 Dec 2025 05:16:59 -0800 (PST) Received: from [192.168.10.48] ([151.95.145.106]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42f7cbe90fdsm36370678f8f.3.2025.12.10.05.16.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 10 Dec 2025 05:16:56 -0800 (PST) From: Paolo Bonzini To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org Subject: [PATCH 02/18] target/i386/tcg: ignore V3 in 32-bit mode Date: Wed, 10 Dec 2025 14:16:37 +0100 Message-ID: <20251210131653.852163-3-pbonzini@redhat.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251210131653.852163-1-pbonzini@redhat.com> References: <20251210131653.852163-1-pbonzini@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.129.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org >From the manual: "In 64-bit mode all 4 bits may be used. [...] In 32-bit and 16-bit modes bit 6 must be 1 (if bit 6 is not 1, the 2-byte VEX version will generate LDS instruction and the 3-byte VEX version will ignore this bit)." Cc: qemu-stable@nongnu.org Signed-off-by: Paolo Bonzini --- target/i386/tcg/decode-new.c.inc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc index 0b85b0f6513..c9b4d5ffa32 100644 --- a/target/i386/tcg/decode-new.c.inc +++ b/target/i386/tcg/decode-new.c.inc @@ -2665,7 +2665,7 @@ static void disas_insn(DisasContext *s, CPUState *cpu) goto unknown_op; } } - s->vex_v = (~vex3 >> 3) & 0xf; + s->vex_v = (~vex3 >> 3) & (CODE64(s) ? 15 : 7); s->vex_l = (vex3 >> 2) & 1; s->prefix |= pp_prefix[vex3 & 3] | PREFIX_VEX; } -- 2.52.0