The following commit has been merged into the x86/microcode branch of tip:
Commit-ID: 7fce8d6eccbc31a561d07c79f359ad09f0424347
Gitweb: https://git.kernel.org/tip/7fce8d6eccbc31a561d07c79f359ad09f0424347
Author: Ashok Raj <ashok.raj@xxxxxxxxx>
AuthorDate: Mon, 29 Aug 2022 18:10:30
Committer: Borislav Petkov <bp@xxxxxxx>
CommitterDate: Fri, 02 Sep 2022 08:01:58 +02:00
x86/microcode: Print previous version of microcode after reload
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 <ashok.raj@xxxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Acked-by: Tony Luck <tony.luck@xxxxxxxxx>
Link: https://lore.kernel.org/r/20220829181030.722891-1-ashok.raj@xxxxxxxxx
---
arch/x86/kernel/cpu/microcode/core.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index ad57e0e..6a41cee 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -491,7 +491,7 @@ wait_for_siblings:
*/
static int microcode_reload_late(void)
{
- int ret;
+ int old = boot_cpu_data.microcode, ret;
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");
@@ -503,7 +503,8 @@ 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;
}
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