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| author | Ashok Raj <ashok.raj@intel.com> | 2023-01-09 07:35:50 -0800 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2023-01-20 21:45:13 +0100 |
| commit | ab31c74455c64e69342ddab21fd9426fcbfefde7 (patch) | |
| tree | cb1d90a528efc24e1cccc853ef3aa052ef83f4e8 /arch/x86/kernel/cpu/microcode/core.c | |
| parent | 59047d942bedc4ce88a2121a9f9e656b9532dd30 (diff) | |
| download | lwn-ab31c74455c64e69342ddab21fd9426fcbfefde7.tar.gz lwn-ab31c74455c64e69342ddab21fd9426fcbfefde7.zip | |
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 <ashok.raj@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230109153555.4986-2-ashok.raj@intel.com
Diffstat (limited to 'arch/x86/kernel/cpu/microcode/core.c')
| -rw-r--r-- | arch/x86/kernel/cpu/microcode/core.c | 3 |
1 files changed, 2 insertions, 1 deletions
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); |