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authorZhao Liu <zhao1.liu@intel.com>2024-04-24 23:49:16 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2024-05-22 19:43:29 +0200
commit2613747a794c4de8cd04e4a24001765220e91f1b (patch)
treed1af733dfe3e049d814bd9950106caed8f2f9dc2 /target
parent9a085c4b4adeec648d6506316b8a42fbd0cf7c3c (diff)
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i386/cpu: Consolidate the use of topo_info in cpu_x86_cpuid()
In cpu_x86_cpuid(), there are many variables in representing the cpu topology, e.g., topo_info, cs->nr_cores and cs->nr_threads. Since the names of cs->nr_cores and cs->nr_threads do not accurately represent its meaning, the use of cs->nr_cores or cs->nr_threads is prone to confusion and mistakes. And the structure X86CPUTopoInfo names its members clearly, thus the variable "topo_info" should be preferred. In addition, in cpu_x86_cpuid(), to uniformly use the topology variable, replace env->dies with topo_info.dies_per_pkg as well. Suggested-by: Robert Hoo <robert.hu@linux.intel.com> Tested-by: Yongwei Ma <yongwei.ma@intel.com> Signed-off-by: Zhao Liu <zhao1.liu@intel.com> Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Tested-by: Babu Moger <babu.moger@amd.com> Message-ID: <20240424154929.1487382-9-zhao1.liu@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'target')
-rw-r--r--target/i386/cpu.c31
1 files changed, 18 insertions, 13 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index 22a8ca1..363f5ee 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6165,11 +6165,16 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
uint32_t limit;
uint32_t signature[3];
X86CPUTopoInfo topo_info;
+ uint32_t cores_per_pkg;
+ uint32_t threads_per_pkg;
topo_info.dies_per_pkg = env->nr_dies;
topo_info.cores_per_die = cs->nr_cores / env->nr_dies;
topo_info.threads_per_core = cs->nr_threads;
+ cores_per_pkg = topo_info.cores_per_die * topo_info.dies_per_pkg;
+ threads_per_pkg = cores_per_pkg * topo_info.threads_per_core;
+
/* Calculate & apply limits for different index ranges */
if (index >= 0xC0000000) {
limit = env->cpuid_xlevel2;
@@ -6205,8 +6210,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*ecx |= CPUID_EXT_OSXSAVE;
}
*edx = env->features[FEAT_1_EDX];
- if (cs->nr_cores * cs->nr_threads > 1) {
- *ebx |= (cs->nr_cores * cs->nr_threads) << 16;
+ if (threads_per_pkg > 1) {
+ *ebx |= threads_per_pkg << 16;
*edx |= CPUID_HT;
}
if (!cpu->enable_pmu) {
@@ -6254,15 +6259,15 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*/
if (*eax & 31) {
int host_vcpus_per_cache = 1 + ((*eax & 0x3FFC000) >> 14);
- int vcpus_per_socket = cs->nr_cores * cs->nr_threads;
- if (cs->nr_cores > 1) {
+
+ if (cores_per_pkg > 1) {
addressable_cores_width = apicid_pkg_offset(&topo_info) -
apicid_core_offset(&topo_info);
*eax &= ~0xFC000000;
*eax |= ((1 << addressable_cores_width) - 1) << 26;
}
- if (host_vcpus_per_cache > vcpus_per_socket) {
+ if (host_vcpus_per_cache > threads_per_pkg) {
/* Share the cache at package level. */
addressable_threads_width = apicid_pkg_offset(&topo_info);
@@ -6412,12 +6417,12 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
switch (count) {
case 0:
*eax = apicid_core_offset(&topo_info);
- *ebx = cs->nr_threads;
+ *ebx = topo_info.threads_per_core;
*ecx |= CPUID_TOPOLOGY_LEVEL_SMT;
break;
case 1:
*eax = apicid_pkg_offset(&topo_info);
- *ebx = cs->nr_cores * cs->nr_threads;
+ *ebx = threads_per_pkg;
*ecx |= CPUID_TOPOLOGY_LEVEL_CORE;
break;
default:
@@ -6437,7 +6442,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
break;
case 0x1F:
/* V2 Extended Topology Enumeration Leaf */
- if (env->nr_dies < 2) {
+ if (topo_info.dies_per_pkg < 2) {
*eax = *ebx = *ecx = *edx = 0;
break;
}
@@ -6447,7 +6452,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
switch (count) {
case 0:
*eax = apicid_core_offset(&topo_info);
- *ebx = cs->nr_threads;
+ *ebx = topo_info.threads_per_core;
*ecx |= CPUID_TOPOLOGY_LEVEL_SMT;
break;
case 1:
@@ -6457,7 +6462,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
break;
case 2:
*eax = apicid_pkg_offset(&topo_info);
- *ebx = cs->nr_cores * cs->nr_threads;
+ *ebx = threads_per_pkg;
*ecx |= CPUID_TOPOLOGY_LEVEL_DIE;
break;
default:
@@ -6685,7 +6690,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
* discards multiple thread information if it is set.
* So don't set it here for Intel to make Linux guests happy.
*/
- if (cs->nr_cores * cs->nr_threads > 1) {
+ if (threads_per_pkg > 1) {
if (env->cpuid_vendor1 != CPUID_VENDOR_INTEL_1 ||
env->cpuid_vendor2 != CPUID_VENDOR_INTEL_2 ||
env->cpuid_vendor3 != CPUID_VENDOR_INTEL_3) {
@@ -6752,7 +6757,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*eax |= (cpu->guest_phys_bits << 16);
}
*ebx = env->features[FEAT_8000_0008_EBX];
- if (cs->nr_cores * cs->nr_threads > 1) {
+ if (threads_per_pkg > 1) {
/*
* Bits 15:12 is "The number of bits in the initial
* Core::X86::Apic::ApicId[ApicId] value that indicate
@@ -6760,7 +6765,7 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
* Bits 7:0 is "The number of threads in the package is NC+1"
*/
*ecx = (apicid_pkg_offset(&topo_info) << 12) |
- ((cs->nr_cores * cs->nr_threads) - 1);
+ (threads_per_pkg - 1);
} else {
*ecx = 0;
}