linux-kernel - [tip: x86/microcode] x86/microcode/amd: Use correct per CPU ucode_cpu

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Message-ID: <169780187573.3135.2892527778268998057.tip-bot2@tip-bot2>
Date:   Fri, 20 Oct 2023 11:37:55 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        "Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/microcode] x86/microcode/amd: Use correct per CPU ucode_cpu_info

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

Commit-ID:     e0dd49a0eb690820e9d0eef0ad7b6ae435cf6549
Gitweb:        https://git.kernel.org/tip/e0dd49a0eb690820e9d0eef0ad7b6ae435cf6549
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Tue, 10 Oct 2023 17:08:41 +02:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Thu, 19 Oct 2023 15:40:00 +02:00

x86/microcode/amd: Use correct per CPU ucode_cpu_info

find_blobs_in_containers() is invoked on every CPU but overwrites
unconditionally ucode_cpu_info of CPU0.

Fix this by using the proper CPU data and move the assignment into the
call site apply_ucode_from_containers() so that the function can be
reused.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/20231010150702.433454320@linutronix.de
---
 arch/x86/kernel/cpu/microcode/amd.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/microcode/amd.c b/arch/x86/kernel/cpu/microcode/amd.c
index b827390..56d8bd6 100644
--- a/arch/x86/kernel/cpu/microcode/amd.c
+++ b/arch/x86/kernel/cpu/microcode/amd.c
@@ -503,9 +503,6 @@ static void find_blobs_in_containers(unsigned int cpuid_1_eax, struct cpio_data 
 	if (!get_builtin_microcode(&cp, x86_family(cpuid_1_eax)))
 		cp = find_microcode_in_initrd(ucode_path);
 
-	/* Needed in load_microcode_amd() */
-	ucode_cpu_info->cpu_sig.sig = cpuid_1_eax;
-
 	*ret = cp;
 }
 
@@ -513,6 +510,9 @@ static void apply_ucode_from_containers(unsigned int cpuid_1_eax)
 {
 	struct cpio_data cp = { };
 
+	/* Needed in load_microcode_amd() */
+	ucode_cpu_info[smp_processor_id()].cpu_sig.sig = cpuid_1_eax;
+
 	find_blobs_in_containers(cpuid_1_eax, &cp);
 	if (!(cp.data && cp.size))
 		return;