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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_H5=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1752492946925116600 Content-Type: text/plain; charset="utf-8" From: Zhao Liu Per SDM, 80000007H EAX Reserved =3D 0. EBX Reserved =3D 0. ECX Reserved =3D 0. EDX Bits 07-00: Reserved =3D 0. Bit 08: Invariant TSC available if 1. Bits 31-09: Reserved =3D 0. EAX/EBX/ECX in CPUID 0x80000007 leaf are reserved for Intel. At present, EAX is reserved for AMD, too. And AMD hasn't used ECX in QEMU. So these 2 registers are both left as 0. Therefore, only fix the EBX and excode it as 0 for Intel. Signed-off-by: Zhao Liu Reviewed-by: Tao Su Link: https://lore.kernel.org/r/20250627035129.2755537-3-zhao1.liu@intel.com Signed-off-by: Paolo Bonzini --- target/i386/cpu.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index ae508fa962d..533c9d9abc7 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -8376,7 +8376,11 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,= uint32_t count, } case 0x80000007: *eax =3D 0; - *ebx =3D env->features[FEAT_8000_0007_EBX]; + if (cpu->vendor_cpuid_only_v2 && IS_INTEL_CPU(env)) { + *ebx =3D 0; + } else { + *ebx =3D env->features[FEAT_8000_0007_EBX]; + } *ecx =3D 0; *edx =3D env->features[FEAT_8000_0007_EDX]; break; --=20 2.50.0