linux-kernel - [tip: x86/core] x86/cpu/hygon: Fix the CPU topology evaluation for real

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Date:   Fri, 13 Oct 2023 09:38:14 -0000
From:   "tip-bot2 for Pu Wen" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Pu Wen <puwen@...on.cn>, Thomas Gleixner <tglx@...utronix.de>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        <stable@...r.kernel.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/cpu/hygon: Fix the CPU topology evaluation for real

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     ee545b94d39a00c93dc98b1dbcbcf731d2eadeb4
Gitweb:        https://git.kernel.org/tip/ee545b94d39a00c93dc98b1dbcbcf731d2eadeb4
Author:        Pu Wen <puwen@...on.cn>
AuthorDate:    Mon, 14 Aug 2023 10:18:26 +02:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Tue, 10 Oct 2023 14:38:16 +02:00

x86/cpu/hygon: Fix the CPU topology evaluation for real

Hygon processors with a model ID > 3 have CPUID leaf 0xB correctly
populated and don't need the fixed package ID shift workaround. The fixup
is also incorrect when running in a guest.

Fixes: e0ceeae708ce ("x86/CPU/hygon: Fix phys_proc_id calculation logic for multi-die processors")
Signed-off-by: Pu Wen <puwen@...on.cn>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Cc: <stable@...r.kernel.org>
Link: https://lore.kernel.org/r/tencent_594804A808BD93A4EBF50A994F228E3A7F07@qq.com
Link: https://lore.kernel.org/r/20230814085112.089607918@linutronix.de
---
 arch/x86/kernel/cpu/hygon.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/hygon.c b/arch/x86/kernel/cpu/hygon.c
index defdc59..a7b3ef4 100644
--- a/arch/x86/kernel/cpu/hygon.c
+++ b/arch/x86/kernel/cpu/hygon.c
@@ -87,8 +87,12 @@ static void hygon_get_topology(struct cpuinfo_x86 *c)
 		if (!err)
 			c->x86_coreid_bits = get_count_order(c->x86_max_cores);
 
-		/* Socket ID is ApicId[6] for these processors. */
-		c->phys_proc_id = c->apicid >> APICID_SOCKET_ID_BIT;
+		/*
+		 * Socket ID is ApicId[6] for the processors with model <= 0x3
+		 * when running on host.
+		 */
+		if (!boot_cpu_has(X86_FEATURE_HYPERVISOR) && c->x86_model <= 0x3)
+			c->phys_proc_id = c->apicid >> APICID_SOCKET_ID_BIT;
 
 		cacheinfo_hygon_init_llc_id(c, cpu);
 	} else if (cpu_has(c, X86_FEATURE_NODEID_MSR)) {