linux-kernel - [patch V5 20/39] x86/microcode/amd: Use correct per CPU ucode_cpu

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Message-ID: <20231017211723.074939820@linutronix.de>
Date:   Tue, 17 Oct 2023 23:23:51 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Borislav Petkov <bp@...en8.de>
Subject: [patch V5 20/39] x86/microcode/amd: Use correct per CPU
 ucode_cpu_info

From: Thomas Gleixner <tglx@...utronix.de>

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>
---
 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 a2776f2af93b..f6ed2c5be932 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;