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x86/microcode/intel: Make early loader look for builtin microcode too

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commit 264285ac01 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@lio96.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1454499225-21544-3-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Borislav Petkov
2016-02-03 12:33:30 +01:00
committed by Greg Kroah-Hartman
parent b562e44f50
commit cd47ecf883
1 changed files with 16 additions and 8 deletions
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24
arch/x86/kernel/cpu/microcode/intel.c
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@@ -551,10 +551,14 @@ scan_microcode(struct mc_saved_data *mc_saved_data, unsigned long *initrd,
cd.data = NULL; cd.data = NULL;
cd.size = 0; cd.size = 0;
cd = find_cpio_data(p, (void *)start, size, &offset); /* try built-in microcode if no initrd */
if (!cd.data) { if (!size) {
if (!load_builtin_intel_microcode(&cd)) if (!load_builtin_intel_microcode(&cd))
return UCODE_ERROR; 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, return get_matching_model_microcode(0, start, cd.data, cd.size,
@@ -728,16 +732,20 @@ void __init load_ucode_intel_bsp(void)
struct boot_params *p; struct boot_params *p;
p = (struct boot_params *)__pa_nodebug(&boot_params); p = (struct boot_params *)__pa_nodebug(&boot_params);
start = p->hdr.ramdisk_image;
size = p->hdr.ramdisk_size; size = p->hdr.ramdisk_size;
_load_ucode_intel_bsp( /*
(struct mc_saved_data *)__pa_nodebug(&mc_saved_data), * Set start only if we have an initrd image. We cannot use initrd_start
(unsigned long *)__pa_nodebug(&mc_saved_in_initrd), * because it is not set that early yet.
start, size); */
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 #else
start = boot_params.hdr.ramdisk_image + PAGE_OFFSET;
size = boot_params.hdr.ramdisk_size; 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); _load_ucode_intel_bsp(&mc_saved_data, mc_saved_in_initrd, start, size);
#endif #endif