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* [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address
@ 2016-12-19 15:32 Boris Ostrovsky
  2016-12-19 15:37 ` Borislav Petkov
  0 siblings, 1 reply; 16+ messages in thread
From: Boris Ostrovsky @ 2016-12-19 15:32 UTC (permalink / raw)
  To: bp; +Cc: x86, linux-kernel, Boris Ostrovsky

When searching for microcode in the ramdisk image we need to adjust the
start address after paging has been turned on (in 32-bit mode).

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---
 arch/x86/kernel/cpu/microcode/core.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/microcode/core.c b/arch/x86/kernel/cpu/microcode/core.c
index c4bb2f7..bc8c3345 100644
--- a/arch/x86/kernel/cpu/microcode/core.c
+++ b/arch/x86/kernel/cpu/microcode/core.c
@@ -227,8 +227,11 @@ struct cpio_data find_microcode_in_initrd(const char *path, bool use_pa)
 	 * Set start only if we have an initrd image. We cannot use initrd_start
 	 * because it is not set that early yet.
 	 */
-	if (size)
+	if (size) {
 		start = params->hdr.ramdisk_image;
+		if (!use_pa)
+			start += PAGE_OFFSET;
+	}
 
 # else /* CONFIG_X86_64 */
 	size  = (unsigned long)boot_params.ext_ramdisk_size << 32;
-- 
2.5.5

^ permalink raw reply	[flat|nested] 16+ messages in thread
end of thread, other threads:[~2016-12-21  9:55 UTC | newest]

Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2016-12-19 15:32 [PATCH] x86/microcode: Adjust ramdisk address when accessing by virtual address Boris Ostrovsky
2016-12-19 15:37 ` Borislav Petkov
2016-12-19 16:10   ` Boris Ostrovsky
2016-12-19 16:40     ` Borislav Petkov
2016-12-19 18:07       ` Borislav Petkov
2016-12-19 18:12         ` Boris Ostrovsky
2016-12-19 18:43           ` Borislav Petkov
2016-12-19 23:32             ` Borislav Petkov
2016-12-20  1:27               ` Boris Ostrovsky
2016-12-20  1:40                 ` Boris Ostrovsky
2016-12-20 14:40                   ` Borislav Petkov
2016-12-20 19:26                     ` Boris Ostrovsky
2016-12-20 19:31                       ` Borislav Petkov
2016-12-20 22:48                         ` Boris Ostrovsky
2016-12-20 22:55                           ` Borislav Petkov
2016-12-21  9:55                     ` [tip:x86/urgent] x86/microcode/AMD: Reload proper initrd start address tip-bot for Borislav Petkov

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