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charset="utf-8" Implement CPUID leaf 0x80000026 (AMD Extended CPU Topology). It presents the complete topology information to guests via a single CPUID with multiple subleafs, each describing a specific hierarchy level, viz. core, complex, die, socket. Note that complex/CCX level relates to "die" in QEMU, and die/CCD level is not supported in QEMU yet. Hence, use CCX at CCD level until diegroups are implemented. Signed-off-by: Shivansh Dhiman --- target/i386/cpu.c | 76 +++++++++++++++++++++++++++++++++++++++++++ target/i386/kvm/kvm.c | 17 ++++++++++ 2 files changed, 93 insertions(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 641777578637..b7827e448aa5 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -495,6 +495,78 @@ static void encode_topo_cpuid1f(CPUX86State *env, uint= 32_t count, assert(!(*eax & ~0x1f)); } =20 +/* + * CPUID_Fn80000026: Extended CPU Topology + * + * EAX Bits Description + * 31:5 Reserved + * 4:0 Number of bits to shift Extended APIC ID right to get a unique + * topology ID of the current hierarchy level. + * + * EBX Bits Description + * 31:16 Reserved + * 15:0 Number of logical processors at the current hierarchy level. + * + * ECX Bits Description + * 31:16 Reserved + * 15:8 Level Type. Values: + * Value Description + * 0h Reserved + * 1h Core + * 2h Complex + * 3h Die + * 4h Socket + * FFh-05h Reserved + * 7:0 Input ECX + * + * EDX Bits Description + * 31:0 Extended APIC ID of the logical processor + */ +static void encode_topo_cpuid80000026(CPUX86State *env, uint32_t count, + X86CPUTopoInfo *topo_info, + uint32_t *eax, uint32_t *ebx, + uint32_t *ecx, uint32_t *edx) +{ + X86CPU *cpu =3D env_archcpu(env); + uint32_t shift, nr_logproc, lvl_type; + + switch (count) { + case 0: + shift =3D apicid_core_offset(topo_info); + nr_logproc =3D num_threads_by_topo_level(topo_info, CPU_TOPOLOGY_L= EVEL_CORE); + lvl_type =3D 1; + break; + + case 1: + shift =3D apicid_die_offset(topo_info); + nr_logproc =3D num_threads_by_topo_level(topo_info, CPU_TOPOLOGY_L= EVEL_DIE); + lvl_type =3D 2; + break; + + case 2: + shift =3D apicid_die_offset(topo_info); + nr_logproc =3D num_threads_by_topo_level(topo_info, CPU_TOPOLOGY_L= EVEL_DIE); + lvl_type =3D 3; + break; + + case 3: + shift =3D apicid_pkg_offset(topo_info); + nr_logproc =3D num_threads_by_topo_level(topo_info, CPU_TOPOLOGY_L= EVEL_SOCKET); + lvl_type =3D 4; + break; + + default: + shift =3D 0; + nr_logproc =3D 0; + lvl_type =3D 0; + } + + *eax =3D shift & 0x1F; + *ebx =3D nr_logproc; + *ecx =3D ((lvl_type & 0xFF) << 8) | (count & 0xFF); + *edx =3D cpu->apic_id; +} + /* Encode cache info for CPUID[0x80000005].ECX or CPUID[0x80000005].EDX */ static uint32_t encode_cache_cpuid80000005(CPUCacheInfo *cache) { @@ -8554,6 +8626,10 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,= uint32_t count, R_EBX) & 0xf; } break; + case 0x80000026: + /* AMD Extended CPU Topology */ + encode_topo_cpuid80000026(env, count, topo_info, eax, ebx, ecx, ed= x); + break; case 0xC0000000: *eax =3D env->cpuid_xlevel2; *ebx =3D 0; diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index 60c798113823..ed3d40bf073e 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -2037,6 +2037,23 @@ uint32_t kvm_x86_build_cpuid(CPUX86State *env, struc= t kvm_cpuid_entry2 *entries, c =3D &entries[cpuid_i++]; } break; + case 0x80000026: + /* Query for all AMD extended topology information leaves */ + for (j =3D 0; ; j++) { + c->function =3D i; + c->flags =3D KVM_CPUID_FLAG_SIGNIFCANT_INDEX; + c->index =3D j; + cpu_x86_cpuid(env, i, j, &c->eax, &c->ebx, &c->ecx, &c->ed= x); + + if (((c->ecx >> 8) & 0xFF) =3D=3D 0) { + break; + } + if (cpuid_i =3D=3D KVM_MAX_CPUID_ENTRIES) { + goto full; + } + c =3D &entries[cpuid_i++]; + } + break; default: c->function =3D i; c->flags =3D 0; --=20 2.43.0 From nobody Mon Feb 9 04:07:47 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=pass; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; arc=pass (i=1 dmarc=pass fromdomain=amd.com); dmarc=pass(p=quarantine dis=none) header.from=amd.com ARC-Seal: i=2; a=rsa-sha256; t=1763719083; cv=pass; d=zohomail.com; s=zohoarc; b=nrtoMRgLEUw/RoSy6lrO+zauKLXDovpAyOi/YuoC2Nel4Xy8RISvYKPT0Q3gNWWnSwsMbNzMUd5w1GBoFerAodNmKzLFzzmyYtFICTEjv+4nS0Uhu3JFOU74j6KVvPmGba6DoAzKealfIKSZcj1ue2U+wuKJjc57w+vZuxsP+iI= ARC-Message-Signature: i=2; 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charset="utf-8" Introduce new CPU property x-force-cpuid-0x80000026 using which the CPUID 0x80000026 is enabled. It defaults to false. If a vCPU's model is host, then CPUID is enabled based on CPU family/model. Implement x86_is_amd_zen4_or_above() helper to detect Zen4+ CPUs using family/model. Signed-off-by: Shivansh Dhiman --- target/i386/cpu.c | 8 ++++++++ target/i386/cpu.h | 18 ++++++++++++++++++ 2 files changed, 26 insertions(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index b7827e448aa5..01c4da7cf134 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -9158,6 +9158,12 @@ void x86_cpu_expand_features(X86CPU *cpu, Error **er= rp) if (env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_SGX) { x86_cpu_adjust_level(cpu, &env->cpuid_min_level, 0x12); } + + /* Enable CPUID[0x80000026] for AMD Genoa models and above */ + if (cpu->force_cpuid_0x80000026 || + (!xcc->model && x86_is_amd_zen4_or_above(cpu))) { + x86_cpu_adjust_level(cpu, &env->cpuid_min_xlevel, 0x80000026); + } } =20 /* Set cpuid_*level* based on cpuid_min_*level, if not explicitly set = */ @@ -10133,6 +10139,8 @@ static const Property x86_cpu_properties[] =3D { arch_cap_always_on, false), DEFINE_PROP_BOOL("x-pdcm-on-even-without-pmu", X86CPU, pdcm_on_even_without_pmu, false), + DEFINE_PROP_BOOL("x-force-cpuid-0x80000026", X86CPU, force_cpuid_0x800= 00026, + false), }; =20 #ifndef CONFIG_USER_ONLY diff --git a/target/i386/cpu.h b/target/i386/cpu.h index cee1f692a1c3..0fecca26dc4a 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -2292,6 +2292,9 @@ struct ArchCPU { /* Force to enable cpuid 0x1f */ bool force_cpuid_0x1f; =20 + /* Force to enable cpuid 0x80000026 */ + bool force_cpuid_0x80000026; + /* Enable auto level-increase for all CPUID leaves */ bool full_cpuid_auto_level; =20 @@ -2879,6 +2882,21 @@ void x86_cpu_xsave_all_areas(X86CPU *cpu, void *buf,= uint32_t buflen); uint32_t xsave_area_size(uint64_t mask, bool compacted); void x86_update_hflags(CPUX86State* env); =20 +static inline bool x86_is_amd_zen4_or_above(X86CPU *cpu) +{ + uint32_t family =3D x86_cpu_family(cpu->env.cpuid_version); + uint32_t model =3D x86_cpu_model(cpu->env.cpuid_version); + + if (!IS_AMD_CPU(&cpu->env) || family < 0x19) { + return false; + } + if (family > 0x19) { + return true; + } + return (model >=3D 0x10 && model <=3D 0x1f) || + (model >=3D 0x60 && model <=3D 0xaf); 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charset="utf-8" Enable CPUID leaf 0x80000026 (Extended CPU Topology) for AMD Zen4+ processo= rs, i.e, Genoa and above. Add version 3 to EPYC-Genoa and version 2 to EPYC-Tur= in CPU models with x-force-cpuid-0x80000026 property enabled. Signed-off-by: Shivansh Dhiman Reviewed-by: Zhao Liu --- target/i386/cpu.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 01c4da7cf134..12500d6b7bed 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -6505,6 +6505,13 @@ static const X86CPUDefinition builtin_x86_defs[] =3D= { }, .cache_info =3D &epyc_genoa_v2_cache_info }, + { + .version =3D 3, + .props =3D (PropValue[]) { + { "x-force-cpuid-0x80000026", "on" }, + { /* end of list */ } + } + }, { /* end of list */ } } }, @@ -6735,6 +6742,17 @@ static const X86CPUDefinition builtin_x86_defs[] =3D= { .xlevel =3D 0x80000022, .model_id =3D "AMD EPYC-Turin Processor", .cache_info =3D &epyc_turin_cache_info, + .versions =3D (X86CPUVersionDefinition[]) { + { .version =3D 1 }, + { + .version =3D 2, + .props =3D (PropValue[]) { + { "x-force-cpuid-0x80000026", "on" }, + { /* end of list */ } + } + }, + { /* end of list */ } + } }, }; =20 --=20 2.43.0 From nobody Mon Feb 9 04:07:47 2026 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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charset="utf-8" From: Ravi Bangoria Bus Lock Detect is enumerated with cpuid Fn0000_0007_ECX_x0=20 bit [24 / BUSLOCKTRAP]. It can be enabled through MSR_IA32_DEBUGCTLMSR. When enabled, hardware clears DR6[11] and raises a #DB exception on occurrence of Bus Lock if CPL > 0. More detail about the feature can be found in AMD APM[1]. Qemu supports remote debugging through host gdb (the "gdbstub" facility) where some of the remote debugging features like instruction and data breakpoints relies on the same hardware infrastructure (#DB, DR6 etc.) that Bus Lock Detect also uses. Instead of handling internally, KVM forwards #DB to Qemu when remote debugging is ON and #DB is being intercepted. It's Qemu's responsibility to re-inject the exception to guest when some of the exception source bits (in DR6) are not being handled by Qemu remote debug handler. Bus Lock Detect is one such case. [1]: AMD64 Architecture Programmer's Manual Pub. 40332, Rev. 4.07 - June 2023, Vol 2, 13.1.3.6 Bus Lock Trap https://bugzilla.kernel.org/attachment.cgi?id=3D304653 Signed-off-by: Ravi Bangoria Signed-off-by: Shivansh Dhiman --- target/i386/cpu.h | 1 + target/i386/kvm/kvm.c | 4 ++-- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/target/i386/cpu.h b/target/i386/cpu.h index 0fecca26dc4a..852b3a33b54d 100644 --- a/target/i386/cpu.h +++ b/target/i386/cpu.h @@ -276,6 +276,7 @@ typedef enum X86Seg { | CR4_SMEP_MASK | CR4_SMAP_MASK | CR4_PKE_MASK | CR4_PKS_M= ASK \ | CR4_LAM_SUP_MASK | CR4_FRED_MASK)) =20 +#define DR6_BLD (1 << 11) #define DR6_BD (1 << 13) #define DR6_BS (1 << 14) #define DR6_BT (1 << 15) diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c index ed3d40bf073e..00c44c2de650 100644 --- a/target/i386/kvm/kvm.c +++ b/target/i386/kvm/kvm.c @@ -5864,14 +5864,14 @@ static int kvm_handle_debug(X86CPU *cpu, } else if (kvm_find_sw_breakpoint(cs, arch_info->pc)) { ret =3D EXCP_DEBUG; 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charset="utf-8" Enable the Bus Lock Detect feature for the EPYC-Turin-v2 CPU model to match the hardware capabilities of AMD Turin processors. This feature allows detection of split locks and bus locks, which can cause performance degradation in multi-core systems. The bus-lock-detect feature is part of the architectural capabilities exposed through CPUID and should be enabled by default for Turin v2 and later CPU models. Signed-off-by: Shivansh Dhiman --- target/i386/cpu.c | 1 + 1 file changed, 1 insertion(+) diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 12500d6b7bed..660b9c2a98b6 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -6748,6 +6748,7 @@ static const X86CPUDefinition builtin_x86_defs[] =3D { .version =3D 2, .props =3D (PropValue[]) { { "x-force-cpuid-0x80000026", "on" }, + { "bus-lock-detect", "on" }, { /* end of list */ } } }, --=20 2.43.0