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Signed-off-by: Babu Moger --- target/i386/cpu.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 4dd9a82..88bc73d 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -4763,6 +4763,33 @@ static int x86_cpu_filter_features(X86CPU *cpu) #define IS_AMD_CPU(env) ((env)->cpuid_vendor1 == CPUID_VENDOR_AMD_1 && \ (env)->cpuid_vendor2 == CPUID_VENDOR_AMD_2 && \ (env)->cpuid_vendor3 == CPUID_VENDOR_AMD_3) +/* + * Check if we can support this topology + * Fail if number of cores are beyond the supported config + * or nr_threads is more than 2 + */ +static int topology_supports_topoext(int nr_cores, int nr_threads, + Error **errp) +{ + if (nr_cores > (MAX_CORES_IN_NODE * MAX_NODES_PER_SOCKET)) { + error_setg(errp, "TOPOEXT unsupported with %d cores per socket", + nr_cores); + error_append_hint(errp, "TOPOEXT supports only up to %d cores per" + " socket\n", + (MAX_CORES_IN_NODE * MAX_NODES_PER_SOCKET)); + return false; + } + + if (nr_threads > 2) { + error_setg(errp, "TOPOEXT unsupported with %d threads per core", + nr_threads); + error_append_hint(errp, "TOPOEXT supports only up to 2 threads" + " per core\n"); + return false; + } + return true; +} + static void x86_cpu_realizefn(DeviceState *dev, Error **errp) { CPUState *cs = CPU(dev); @@ -4953,6 +4980,19 @@ static void x86_cpu_realizefn(DeviceState *dev, Error **errp) qemu_init_vcpu(cs); + if (cpu->auto_topoext && + !(env->user_features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT)) { + if (cs->nr_cores <= (MAX_CORES_IN_NODE * MAX_NODES_PER_SOCKET) && + (cs->nr_threads <= 2)) { + env->features[FEAT_8000_0001_ECX] |= CPUID_EXT3_TOPOEXT; + } + } + + if ((env->features[FEAT_8000_0001_ECX] & CPUID_EXT3_TOPOEXT) && + !topology_supports_topoext(cs->nr_cores, cs->nr_threads, errp)) { + return; + } + /* 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