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authorBorislav Petkov <bp@suse.de>2016-12-20 11:54:30 +0100
committerThomas Gleixner <tglx@linutronix.de>2016-12-21 10:50:04 +0100
commit8877ebdd3f9a3ffc84c4b67562d257c5f553bc49 (patch)
treedf05f341d7dcde40147e69745dcb3a2b2a80f2d8 /arch
parent9120cf4fd9ae77245ce9137869bcbd16575cc633 (diff)
downloadlinux-8877ebdd3f9a3ffc84c4b67562d257c5f553bc49.tar.bz2
x86/microcode/AMD: Reload proper initrd start address
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/cpu/microcode/core.c12
1 files changed, 5 insertions, 7 deletions
diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index c4bb2f7169f6..2af69d27da62 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -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);