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20:kMR2wj2jmL6xz9sS/B8zGkvidiG+TDUhObyMXvo9WRVl8ejDJ+5zyB1VrEgEFF5qavNwNl0rcl3rBTQRB8HKLeP8dhfpcTr29Y2EKhM7HDTNSX6NPgdx+sBhUzqvn1Wb+hXlUMhDpNIVNlIUnyDzEciFXvg6r6QIKPyjJYlwE/yK+c1TMBSRZCJFPJHsP5gK3laSLyi13GAVptqdkiV8foj3/OUwf+iCQBDqmhlTXbWEPrQC9bnrkFRMhODbW9Av X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 14 Jun 2018 01:18:42.8340 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 1265e11a-35f2-4dfd-73e0-08d5d194c508 X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR12MB2480 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 40.107.70.47 Subject: [Qemu-devel] [PATCH v14 5/6] i386: Disable TOPOEXT feature if it cannot be supported 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, babu.moger@amd.com, kash@tripleback.net, qemu-devel@nongnu.org, kvm@vger.kernel.org Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP Disable the TOPOEXT feature if it cannot be supported. We cannot support this feature with more than 2 nr_threads or more than 32 cores in a socket. Signed-off-by: Babu Moger --- target/i386/cpu.c | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 2eb26da..637d8eb 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -4765,7 +4765,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp) X86CPUClass *xcc = X86_CPU_GET_CLASS(dev); CPUX86State *env = &cpu->env; Error *local_err = NULL; - static bool ht_warned; + static bool ht_warned, topo_warned; if (xcc->host_cpuid_required && !accel_uses_host_cpuid()) { char *name = x86_cpu_class_get_model_name(xcc); @@ -4779,6 +4779,21 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp) return; } + /* Disable TOPOEXT if topology cannot be supported */ + if (env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT) { + if (!topology_supports_topoext(MAX_CORES_IN_NODE * MAX_NODES_PER_SOCKET, + 2)) { + env->features[FEAT_8000_0001_ECX] &= !CPUID_EXT3_TOPOEXT; + if (!topo_warned) { + error_report("TOPOEXT feature cannot be supported with more" + " than %d cores or more than 2 threads per socket." + " Disabling the feature.", + (MAX_CORES_IN_NODE * MAX_NODES_PER_SOCKET)); + topo_warned = true; + } + } + } + x86_cpu_expand_features(cpu, &local_err); if (local_err) { goto out;