diff options
| -rw-r--r-- | target/i386/cpu.c | 20 |
1 files changed, 16 insertions, 4 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 94cc4a8700..6a57ef13af 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -5284,10 +5284,22 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, /* cache info: needed for Core compatibility */ if (cpu->cache_info_passthrough) { x86_cpu_get_cache_cpuid(index, count, eax, ebx, ecx, edx); - /* QEMU gives out its own APIC IDs, never pass down bits 31..26. */ - *eax &= ~0xFC000000; - if ((*eax & 31) && cs->nr_cores > 1) { - *eax |= (pow2ceil(cs->nr_cores) - 1) << 26; + /* + * QEMU has its own number of cores/logical cpus, + * set 24..14, 31..26 bit to configured values + */ + if (*eax & 31) { + int host_vcpus_per_cache = 1 + ((*eax & 0x3FFC000) >> 14); + int vcpus_per_socket = env->nr_dies * cs->nr_cores * + cs->nr_threads; + if (cs->nr_cores > 1) { + *eax &= ~0xFC000000; + *eax |= (pow2ceil(cs->nr_cores) - 1) << 26; + } + if (host_vcpus_per_cache > vcpus_per_socket) { + *eax &= ~0x3FFC000; + *eax |= (pow2ceil(vcpus_per_socket) - 1) << 14; + } } } else if (cpu->vendor_cpuid_only && IS_AMD_CPU(env)) { *eax = *ebx = *ecx = *edx = 0; |