From ab31c74455c64e69342ddab21fd9426fcbfefde7 Mon Sep 17 00:00:00 2001 From: Ashok Raj Date: Mon, 9 Jan 2023 07:35:50 -0800 Subject: x86/microcode: Add a parameter to microcode_check() to store CPU capabilities Add a parameter to store CPU capabilities before performing a microcode update so that CPU capabilities can be compared before and after update. [ bp: Massage. ] Signed-off-by: Ashok Raj Signed-off-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/20230109153555.4986-2-ashok.raj@intel.com --- arch/x86/kernel/cpu/microcode/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'arch/x86/kernel/cpu/microcode') diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c index 99abb318aa7f..dc5dfba7e78e 100644 --- a/arch/x86/kernel/cpu/microcode/core.c +++ b/arch/x86/kernel/cpu/microcode/core.c @@ -438,6 +438,7 @@ wait_for_siblings: static int microcode_reload_late(void) { int old = boot_cpu_data.microcode, ret; + struct cpuinfo_x86 prev_info; pr_err("Attempting late microcode loading - it is dangerous and taints the kernel.\n"); pr_err("You should switch to early loading, if possible.\n"); @@ -447,7 +448,7 @@ static int microcode_reload_late(void) ret = stop_machine_cpuslocked(__reload_late, NULL, cpu_online_mask); if (ret == 0) - microcode_check(); + microcode_check(&prev_info); pr_info("Reload completed, microcode revision: 0x%x -> 0x%x\n", old, boot_cpu_data.microcode); -- cgit v1.2.3