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x86/microcode/AMD: Reload proper initrd start address

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When we switch to virtual addresses and, especially after
reserve_initrd()->relocate_initrd() have run, we have the updated initrd
address in initrd_start. Use initrd_start then instead of the address
which has been passed to us through boot params. (That still gets used
when we're running the very early routines on the BSP).

Reported-and-tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: http://lkml.kernel.org/r/20161220144012.lc4cwrg6dphqbyqu@pd.tnic
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Borislav Petkov 2016-12-20 11:54:30 +01:00 committed by Thomas Gleixner
parent 9120cf4fd9
commit 8877ebdd3f
1 changed files with 5 additions and 7 deletions
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12
arch/x86/kernel/cpu/microcode/core.c
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@ -243,14 +243,12 @@ struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa)
# endif
/*
* Did we relocate the ramdisk?
*
* So we possibly relocate the ramdisk *after* applying microcode on the
* BSP so we rely on use_pa (use physical addresses) - even if it is not
* absolutely correct - to determine whether we've done the ramdisk
* relocation already.
* Fixup the start address: after reserve_initrd() runs, initrd_start
* has the virtual address of the beginning of the initrd. It also
* possibly relocates the ramdisk. In either case, initrd_start contains
* the updated address so use that instead.
*/
if (!use_pa && relocated_ramdisk)
if (!use_pa && initrd_start)
start = initrd_start;
return find_cpio_data(path, (void *)start, size, NULL);