This is a note to let you know that I've just added the patch titled
x86/microcode/intel: Make early loader look for builtin microcode too
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-microcode-intel-make-early-loader-look-for-builtin-microcode-too.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 264285ac01673e70557c43ecee338ce97c4c0672 Mon Sep 17 00:00:00 2001
From: Borislav Petkov <bp@xxxxxxx>
Date: Wed, 3 Feb 2016 12:33:30 +0100
Subject: x86/microcode/intel: Make early loader look for builtin microcode too
From: Borislav Petkov <bp@xxxxxxx>
commit 264285ac01673e70557c43ecee338ce97c4c0672 upstream.
Set the initrd @start depending on the presence of an initrd. Otherwise,
builtin microcode loading doesn't work as the start is wrong and we're
using it to compute offset to the microcode blobs.
Tested-by: Thomas Voegtle <tv@xxxxxxxx>
Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1454499225-21544-3-git-send-email-bp@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/microcode/intel.c | 24 ++++++++++++++++--------
1 file changed, 16 insertions(+), 8 deletions(-)
--- a/arch/x86/kernel/cpu/microcode/intel.c
+++ b/arch/x86/kernel/cpu/microcode/intel.c
@@ -555,10 +555,14 @@ scan_microcode(struct mc_saved_data *mc_
cd.data = NULL;
cd.size = 0;
- cd = find_cpio_data(p, (void *)start, size, &offset);
- if (!cd.data) {
+ /* try built-in microcode if no initrd */
+ if (!size) {
if (!load_builtin_intel_microcode(&cd))
return UCODE_ERROR;
+ } else {
+ cd = find_cpio_data(p, (void *)start, size, &offset);
+ if (!cd.data)
+ return UCODE_ERROR;
}
return get_matching_model_microcode(0, start, cd.data, cd.size,
@@ -732,16 +736,20 @@ void __init load_ucode_intel_bsp(void)
struct boot_params *p;
p = (struct boot_params *)__pa_nodebug(&boot_params);
- start = p->hdr.ramdisk_image;
size = p->hdr.ramdisk_size;
- _load_ucode_intel_bsp(
- (struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
- (unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
- start, size);
+ /*
+ * Set start only if we have an initrd image. We cannot use initrd_start
+ * because it is not set that early yet.
+ */
+ start = (size ? p->hdr.ramdisk_image : 0);
+
+ _load_ucode_intel_bsp((struct mc_saved_data *)__pa_nodebug(&mc_saved_data),
+ (unsigned long *)__pa_nodebug(&mc_saved_in_initrd),
+ start, size);
#else
- start = boot_params.hdr.ramdisk_image + PAGE_OFFSET;
size = boot_params.hdr.ramdisk_size;
+ start = (size ? boot_params.hdr.ramdisk_image + PAGE_OFFSET : 0);
_load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
#endif
Patches currently in stable-queue which might be from bp@xxxxxxx are
queue-4.4/x86-microcode-intel-make-early-loader-look-for-builtin-microcode-too.patch
queue-4.4/edac-amd64_edac-shift-wrapping-issue-in-f1x_get_norm_dct_addr.patch
queue-4.4/x86-microcode-untangle-from-blk_dev_initrd.patch
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