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20:uJGLXAAOmkzrjhedI3nTm3jkGpZyboqzxW0DldWGBqMQVfO3UvWjrkyqUkWnQrLU5L47Uf3W4/+6vG7BC2jKud0uxbEwDWyxt5ajsCpq0E7n7LL49WmPeawlX+2/YOSeYtadK6TgFIaOVbfOky8kVVgDIAmfIFMgEmWL0nTYhFytQXn4bJIw+51Onaa1kiEXmPcTiOVplNNHNQ1ARGe2HcSmgPvlq2geQIRnw0Z88XUJdOl6bLf+Lc6szDoDa1A6 X-MS-Office365-Filtering-Correlation-Id: 07712dd6-f0d3-42fa-6076-08d5bf7cc00c X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 May 2018 00:41:25.8242 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 07712dd6-f0d3-42fa-6076-08d5bf7cc00c X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR12MB2479 X-detected-operating-system: by eggs.gnu.org: Windows 7 or 8 [fuzzy] X-Received-From: 104.47.40.50 Subject: [Qemu-devel] [PATCH v10 3/5] i386: Add support for CPUID_8000_001E for AMD 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+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Add support for cpuid leaf CPUID_8000_001E. Build the config that closely match the underlying hardware. Please refer Processor Programming Reference (PPR) for AMD Family 17h Model for more details. Signed-off-by: Babu Moger --- target/i386/cpu.c | 85 +++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 85 insertions(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 1dd060a..d9ccaad 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -415,6 +415,86 @@ static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, CPUState *cs, (cache->complex_indexing ? CACHE_COMPLEX_IDX : 0); } +/* Data structure to hold the configuration info for a given core index */ +struct epyc_topo { + /* core complex id of the current core index */ + int ccx_id; + /* new core id for this core index in the topology */ + int core_id; + /* Node(or Die) id this core index */ + int node_id; + /* Number of nodes(or dies) in this config, 0 based */ + int num_nodes; +}; + +/* + * Build the configuration closely match the EPYC hardware + * nr_cores : Total number of cores in the config + * core_id : Core index of the current CPU + * topo : Data structure to hold all the config info for this core index + * Rules + * Max ccx in a node(die) = 2 + * Max cores in a ccx = 4 + * Max nodes(dies) = 4 (1, 2, 4) + * Max sockets = 2 + * Maintain symmetry as much as possible + */ +static void epyc_build_topology(int nr_cores, int core_id, + struct epyc_topo *topo) +{ + int nodes = 1, cores_in_ccx; + int i; + + /* Lets see if we can fit all the cores in one ccx */ + if (nr_cores <= MAX_CORES_IN_CCX) { + cores_in_ccx = nr_cores; + goto topo; + } + /* + * Figure out the number of nodes(or dies) required to build + * this config. Max cores in a node is 8 + */ + for (i = nodes; i <= MAX_NODES_EPYC; i++) { + if (nr_cores <= (i * MAX_CORES_IN_NODE)) { + nodes = i; + break; + } + /* We support nodes 1, 2, 4 */ + if (i == 3) { + continue; + } + } + /* Spread the cores accros all the CCXs and return max cores in a ccx */ + cores_in_ccx = (nr_cores / (nodes * MAX_CCX)) + + ((nr_cores % (nodes * MAX_CCX)) ? 1 : 0); + +topo: + topo->node_id = core_id / (cores_in_ccx * MAX_CCX); + topo->ccx_id = (core_id % (cores_in_ccx * MAX_CCX)) / cores_in_ccx; + topo->core_id = core_id % cores_in_ccx; + /* num_nodes is 0 based, return n - 1 */ + topo->num_nodes = nodes - 1; +} + +/* Encode cache info for CPUID[8000001E] */ +static void encode_topo_cpuid8000001e(CPUState *cs, X86CPU *cpu, + uint32_t *eax, uint32_t *ebx, + uint32_t *ecx, uint32_t *edx) +{ + struct epyc_topo topo = {0}; + + *eax = cpu->apic_id; + epyc_build_topology(cs->nr_cores, cpu->core_id, &topo); + if (cs->nr_threads - 1) { + *ebx = ((cs->nr_threads - 1) << 8) | (topo.node_id << 3) | + (topo.ccx_id << 2) | topo.core_id; + } else { + *ebx = (topo.node_id << 4) | (topo.ccx_id << 3) | topo.core_id; + } + *ecx = (topo.num_nodes << 8) | (cpu->socket_id << 2) | topo.node_id; + *edx = 0; +} + /* * Definitions of the hardcoded cache entries we expose: * These are legacy cache values. If there is a need to change any @@ -4108,6 +4188,11 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, break; } break; + case 0x8000001E: + assert(cpu->core_id <= 255); + encode_topo_cpuid8000001e(cs, cpu, + eax, ebx, ecx, edx); + break; case 0xC0000000: *eax = env->cpuid_xlevel2; *ebx = 0;