From: Ashok Raj Date: Mon, 29 Aug 2022 18:10:30 +0000 (+0000) Subject: x86/microcode: Print previous version of microcode after reload X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=a9e76b276b10c89d9585d775a37bcc8d925fa89d;p=linux.git x86/microcode: Print previous version of microcode after reload [ Upstream commit 7fce8d6eccbc31a561d07c79f359ad09f0424347 ] Print both old and new versions of microcode after a reload is complete because knowing the previous microcode version is sometimes important from a debugging perspective. [ bp: Massage commit message. ] Signed-off-by: Ashok Raj Signed-off-by: Borislav Petkov Acked-by: Tony Luck Link: https://lore.kernel.org/r/20220829181030.722891-1-ashok.raj@intel.com Stable-dep-of: c0dd9245aa9e ("x86/microcode: Check CPU capabilities after late microcode update correctly") Signed-off-by: Sasha Levin --- diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index dc346bbb06777..a7fc2d47a4ace 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -508,7 +508,7 @@ wait_for_siblings: */ static int microcode_reload_late(void) { - int ret; + int old = boot_cpu_data.microcode, ret; atomic_set(&late_cpus_in, 0); atomic_set(&late_cpus_out, 0); @@ -517,7 +517,8 @@ static int microcode_reload_late(void) if (ret == 0) microcode_check(); - pr_info("Reload completed, microcode revision: 0x%x\n", boot_cpu_data.microcode); + pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n", + old, boot_cpu_data.microcode); return ret; }