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Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[
From: |
Moger, Babu |
Subject: |
Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4] |
Date: |
Wed, 2 Aug 2023 18:49:10 -0500 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 |
Hi Zhao,
Hitting this error after this patch.
ERROR:../target/i386/cpu.c:257:max_processor_ids_for_cache: code should
not be reached
Bail out! ERROR:../target/i386/cpu.c:257:max_processor_ids_for_cache: code
should not be reached
Aborted (core dumped)
Looks like share_level for all the caches for AMD is not initialized.
Thanks
Babu
On 8/1/23 05:35, Zhao Liu wrote:
> From: Zhao Liu <zhao1.liu@intel.com>
>
> CPUID[4].EAX[bits 25:14] is used to represent the cache topology for
> intel CPUs.
>
> After cache models have topology information, we can use
> CPUCacheInfo.share_level to decide which topology level to be encoded
> into CPUID[4].EAX[bits 25:14].
>
> And since maximum_processor_id (original "num_apic_ids") is parsed
> based on cpu topology levels, which are verified when parsing smp, it's
> no need to check this value by "assert(num_apic_ids > 0)" again, so
> remove this assert.
>
> Additionally, wrap the encoding of CPUID[4].EAX[bits 31:26] into a
> helper to make the code cleaner.
>
> Signed-off-by: Zhao Liu <zhao1.liu@intel.com>
> ---
> Changes since v1:
> * Use "enum CPUTopoLevel share_level" as the parameter in
> max_processor_ids_for_cache().
> * Make cache_into_passthrough case also use
> max_processor_ids_for_cache() and max_core_ids_in_package() to
> encode CPUID[4]. (Yanan)
> * Rename the title of this patch (the original is "i386: Use
> CPUCacheInfo.share_level to encode CPUID[4].EAX[bits 25:14]").
> ---
> target/i386/cpu.c | 70 +++++++++++++++++++++++++++++------------------
> 1 file changed, 43 insertions(+), 27 deletions(-)
>
> diff --git a/target/i386/cpu.c b/target/i386/cpu.c
> index 55aba4889628..c9897c0fe91a 100644
> --- a/target/i386/cpu.c
> +++ b/target/i386/cpu.c
> @@ -234,22 +234,53 @@ static uint8_t cpuid2_cache_descriptor(CPUCacheInfo
> *cache)
> ((t) == UNIFIED_CACHE) ? CACHE_TYPE_UNIFIED : \
> 0 /* Invalid value */)
>
> +static uint32_t max_processor_ids_for_cache(X86CPUTopoInfo *topo_info,
> + enum CPUTopoLevel share_level)
> +{
> + uint32_t num_ids = 0;
> +
> + switch (share_level) {
> + case CPU_TOPO_LEVEL_CORE:
> + num_ids = 1 << apicid_core_offset(topo_info);
> + break;
> + case CPU_TOPO_LEVEL_DIE:
> + num_ids = 1 << apicid_die_offset(topo_info);
> + break;
> + case CPU_TOPO_LEVEL_PACKAGE:
> + num_ids = 1 << apicid_pkg_offset(topo_info);
> + break;
> + default:
> + /*
> + * Currently there is no use case for SMT and MODULE, so use
> + * assert directly to facilitate debugging.
> + */
> + g_assert_not_reached();
> + }
> +
> + return num_ids - 1;
> +}
> +
> +static uint32_t max_core_ids_in_package(X86CPUTopoInfo *topo_info)
> +{
> + uint32_t num_cores = 1 << (apicid_pkg_offset(topo_info) -
> + apicid_core_offset(topo_info));
> + return num_cores - 1;
> +}
>
> /* Encode cache info for CPUID[4] */
> static void encode_cache_cpuid4(CPUCacheInfo *cache,
> - int num_apic_ids, int num_cores,
> + X86CPUTopoInfo *topo_info,
> uint32_t *eax, uint32_t *ebx,
> uint32_t *ecx, uint32_t *edx)
> {
> assert(cache->size == cache->line_size * cache->associativity *
> cache->partitions * cache->sets);
>
> - assert(num_apic_ids > 0);
> *eax = CACHE_TYPE(cache->type) |
> CACHE_LEVEL(cache->level) |
> (cache->self_init ? CACHE_SELF_INIT_LEVEL : 0) |
> - ((num_cores - 1) << 26) |
> - ((num_apic_ids - 1) << 14);
> + (max_core_ids_in_package(topo_info) << 26) |
> + (max_processor_ids_for_cache(topo_info, cache->share_level) <<
> 14);
>
> assert(cache->line_size > 0);
> assert(cache->partitions > 0);
> @@ -6116,56 +6147,41 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
> uint32_t count,
> int host_vcpus_per_cache = 1 + ((*eax & 0x3FFC000) >> 14);
>
> if (cores_per_pkg > 1) {
> - int addressable_cores_offset =
> -
> apicid_pkg_offset(&topo_info) -
> -
> apicid_core_offset(&topo_info);
> -
> *eax &= ~0xFC000000;
> - *eax |= (1 << addressable_cores_offset - 1) << 26;
> + *eax |= max_core_ids_in_package(&topo_info) << 26;
> }
> if (host_vcpus_per_cache > cpus_per_pkg) {
> - int pkg_offset = apicid_pkg_offset(&topo_info);
> -
> *eax &= ~0x3FFC000;
> - *eax |= (1 << pkg_offset - 1) << 14;
> + *eax |=
> + max_processor_ids_for_cache(&topo_info,
> + CPU_TOPO_LEVEL_PACKAGE) <<
> 14;
> }
> }
> } else if (cpu->vendor_cpuid_only && IS_AMD_CPU(env)) {
> *eax = *ebx = *ecx = *edx = 0;
> } else {
> *eax = 0;
> - int addressable_cores_offset = apicid_pkg_offset(&topo_info) -
> - apicid_core_offset(&topo_info);
> - int core_offset, die_offset;
>
> switch (count) {
> case 0: /* L1 dcache info */
> - core_offset = apicid_core_offset(&topo_info);
> encode_cache_cpuid4(env->cache_info_cpuid4.l1d_cache,
> - (1 << core_offset),
> - (1 << addressable_cores_offset),
> + &topo_info,
> eax, ebx, ecx, edx);
> break;
> case 1: /* L1 icache info */
> - core_offset = apicid_core_offset(&topo_info);
> encode_cache_cpuid4(env->cache_info_cpuid4.l1i_cache,
> - (1 << core_offset),
> - (1 << addressable_cores_offset),
> + &topo_info,
> eax, ebx, ecx, edx);
> break;
> case 2: /* L2 cache info */
> - core_offset = apicid_core_offset(&topo_info);
> encode_cache_cpuid4(env->cache_info_cpuid4.l2_cache,
> - (1 << core_offset),
> - (1 << addressable_cores_offset),
> + &topo_info,
> eax, ebx, ecx, edx);
> break;
> case 3: /* L3 cache info */
> - die_offset = apicid_die_offset(&topo_info);
> if (cpu->enable_l3_cache) {
> encode_cache_cpuid4(env->cache_info_cpuid4.l3_cache,
> - (1 << die_offset),
> - (1 << addressable_cores_offset),
> + &topo_info,
> eax, ebx, ecx, edx);
> break;
> }
--
Thanks
Babu Moger
- Re: [PATCH v3 08/17] i386: Support modules_per_die in X86CPUTopoInfo, (continued)
- [PATCH v3 09/17] i386: Support module_id in X86CPUTopoIDs, Zhao Liu, 2023/08/01
- [PATCH v3 10/17] i386/cpu: Introduce cluster-id to X86CPU, Zhao Liu, 2023/08/01
- [PATCH v3 12/17] hw/i386/pc: Support smp.clusters for x86 PC machine, Zhao Liu, 2023/08/01
- [PATCH v3 11/17] tests: Add test case of APIC ID for module level parsing, Zhao Liu, 2023/08/01
- [PATCH v3 13/17] i386: Add cache topology info in CPUCacheInfo, Zhao Liu, 2023/08/01
- [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4], Zhao Liu, 2023/08/01
- Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4],
Moger, Babu <=
- Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4], Moger, Babu, 2023/08/03
- Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4], Zhao Liu, 2023/08/04
- Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4], Moger, Babu, 2023/08/04
- Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4], Zhao Liu, 2023/08/14
- Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4], Moger, Babu, 2023/08/14
- Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4], Zhao Liu, 2023/08/18
- Re: [PATCH v3 14/17] i386: Use CPUCacheInfo.share_level to encode CPUID[4], Moger, Babu, 2023/08/23
[PATCH v3 15/17] i386: Fix NumSharingCache for CPUID[0x8000001D].EAX[bits 25:14], Zhao Liu, 2023/08/01