From: K Prateek Nayak <kprateek.nayak@amd.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>, <x86@kernel.org>
Cc: Naveen rao <naveen.rao@amd.com>,
Sairaj Kodilkar <sarunkod@amd.com>,
"H. Peter Anvin" <hpa@zytor.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>,
"Xin Li (Intel)" <xin@zytor.com>,
Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Tom Lendacky <thomas.lendacky@amd.com>,
<linux-kernel@vger.kernel.org>, <kvm@vger.kernel.org>,
Mario Limonciello <mario.limonciello@amd.com>,
"Gautham R. Shenoy" <gautham.shenoy@amd.com>,
Babu Moger <babu.moger@amd.com>,
Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>,
Naveen N Rao <naveen@kernel.org>, <stable@vger.kernel.org>
Subject: Re: [PATCH v4 1/4] x86/cpu/topology: Use initial APIC ID from XTOPOLOGY leaf on AMD/HYGON
Date: Mon, 25 Aug 2025 13:47:54 +0530 [thread overview]
Message-ID: <aa5cb79b-914a-474c-9015-e36d54149cf8@amd.com> (raw)
In-Reply-To: <20250825075732.10694-2-kprateek.nayak@amd.com>
On 8/25/2025 1:27 PM, K Prateek Nayak wrote:
> AMD64 Architecture Programmer's Manual Volume 2: System Programming Pub.
> 24593 Rev. 3.42 [2] Section 16.12 "x2APIC_ID" mentions the Extended
> Enumeration leaf 0x8000001e (which was later superseded by the extended
The above should have been CPUID leaf 0xb (Fn0000_000B_EDX[31:0]) and
not 0x8000001e. Sorry for the oversight.
> leaf 0x80000026) provides the full x2APIC ID under all circumstances
> unlike the one reported by CPUID leaf 0x8000001e EAX which depends on
> the mode in which APIC is configured.
--
Thanks and Regards,
Prateek
next prev parent reply other threads:[~2025-08-25 8:18 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-25 7:57 [PATCH v4 0/4] x86/cpu/topology: Fix the preferred order of initial APIC ID parsing on AMD/Hygon K Prateek Nayak
2025-08-25 7:57 ` [PATCH v4 1/4] x86/cpu/topology: Use initial APIC ID from XTOPOLOGY leaf on AMD/HYGON K Prateek Nayak
2025-08-25 8:17 ` K Prateek Nayak [this message]
2025-08-27 10:34 ` [tip: x86/urgent] " tip-bot2 for K Prateek Nayak
2025-08-25 7:57 ` [PATCH v4 2/4] x86/cpu/topology: Always try cpu_parse_topology_ext() on AMD/Hygon K Prateek Nayak
2025-08-30 17:19 ` Borislav Petkov
2025-09-01 4:21 ` K Prateek Nayak
2025-09-01 14:04 ` Borislav Petkov
2025-08-25 7:57 ` [PATCH v4 3/4] x86/cpu/topology: Check for X86_FEATURE_XTOPOLOGY instead of passing has_topoext K Prateek Nayak
2025-08-25 7:57 ` [PATCH v4 4/4] x86/msr-index: Define AMD64_CPUID_FN_EXT MSR K Prateek Nayak
2025-08-25 8:49 ` [PATCH v4 0/4] x86/cpu/topology: Fix the preferred order of initial APIC ID parsing on AMD/Hygon Borislav Petkov
2025-08-25 9:03 ` K Prateek Nayak
2025-09-01 10:11 ` [RFC PATCH v4 5/4] Documentation/x86/topology: Detail CPUID leaves used for topology enumeration K Prateek Nayak
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