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20:vmWg9KEEEq9peHeLw9ZvCmmEDSqIJd5N6H38+gM4s9F8+zGYgmj7JfkofoZUna7DcW/67WGdKQBKd1XOREULf9v8Oe2jDc+2WKWj9hQjK5T0aKgmDQgIdij3mPIF9+OhJYSHpT4Irukgh0pDp+ImQg6liij1yFYcVs1zQpLQFGytDn9EqSaQwUe+21OXKe4wVCf6nwSVdkP/WvZrM4emdkh46GFFGxUY9n2RBAcfVY1Hwp6K34OoPt3AiE5mx8EG X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Jun 2018 17:15:59.5986 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: cba823b1-337e-44ae-d7c9-08d5d2e3aa7c X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM5PR12MB2471 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 40.107.73.61 Subject: [Qemu-devel] [PATCH v15 3/3] i386: Remove generic SMT thread check X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: geoff@hostfission.com, kvm@vger.kernel.org, kash@tripleback.net, mtosatti@redhat.com, qemu-devel@nongnu.org, babu.moger@amd.com Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Remove generic non-intel check while validating hyperthreading support. Certain AMD CPUs can support hyperthreading now. CPU family with TOPOEXT feature can support hyperthreading now. Signed-off-by: Babu Moger Tested-by: Geoffrey McRae Reviewed-by: Eduardo Habkost --- target/i386/cpu.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 2f839ec..cecf421 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -4982,17 +4982,22 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp) qemu_init_vcpu(cs); - /* Only Intel CPUs support hyperthreading. Even though QEMU fixes this - * issue by adjusting CPUID_0000_0001_EBX and CPUID_8000_0008_ECX - * based on inputs (sockets,cores,threads), it is still better to gives + /* + * Most Intel and certain AMD CPUs support hyperthreading. Even though QEMU + * fixes this issue by adjusting CPUID_0000_0001_EBX and CPUID_8000_0008_ECX + * based on inputs (sockets,cores,threads), it is still better to give * users a warning. * * NOTE: the following code has to follow qemu_init_vcpu(). Otherwise * cs->nr_threads hasn't be populated yet and the checking is incorrect. */ - if (!IS_INTEL_CPU(env) && cs->nr_threads > 1 && !ht_warned) { - error_report("AMD CPU doesn't support hyperthreading. Please configure" - " -smp options properly."); + if (IS_AMD_CPU(env) && + !(env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT) && + cs->nr_threads > 1 && !ht_warned) { + error_report("This family of AMD CPU doesn't support " + "hyperthreading(%d). Please configure -smp " + "options properly or try enabling topoext feature.", + cs->nr_threads); ht_warned = true; }