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authorBorislav Petkov <bp@suse.de>2013-12-04 20:50:42 +0100
committerBorislav Petkov <bp@suse.de>2014-01-13 19:56:25 +0100
commit5aa3d718f259007121b9366d36315fb8a2983d3d (patch)
tree80ed9ca453d198e51f6c402880148a549b5e7380
parentLinux 3.13-rc8 (diff)
downloadlinux-5aa3d718f259007121b9366d36315fb8a2983d3d.tar.xz
linux-5aa3d718f259007121b9366d36315fb8a2983d3d.zip
x86, ramdisk: Export relocated ramdisk VA
The ramdisk can possibly get relocated if the whole image is not mapped. And since we're going over it in the microcode loader and fishing out the relevant microcode patches, we want access it at its new location. Thus, export it. Signed-off-by: Borislav Petkov <bp@suse.de> Tested-by: Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>
-rw-r--r--arch/x86/include/asm/setup.h3
-rw-r--r--arch/x86/kernel/setup.c19
2 files changed, 12 insertions, 10 deletions
diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h
index 59bcf4e22418..d62c9f809bc5 100644
--- a/arch/x86/include/asm/setup.h
+++ b/arch/x86/include/asm/setup.h
@@ -3,7 +3,6 @@
#include <uapi/asm/setup.h>
-
#define COMMAND_LINE_SIZE 2048
#include <linux/linkage.h>
@@ -29,6 +28,8 @@
#include <asm/bootparam.h>
#include <asm/x86_init.h>
+extern u64 relocated_ramdisk;
+
/* Interrupt control for vSMPowered x86_64 systems */
#ifdef CONFIG_X86_64
void vsmp_init(void);
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index cb233bc9dee3..baefc6dc553c 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -295,6 +295,8 @@ static void __init reserve_brk(void)
_brk_start = 0;
}
+u64 relocated_ramdisk;
+
#ifdef CONFIG_BLK_DEV_INITRD
static u64 __init get_ramdisk_image(void)
@@ -321,25 +323,24 @@ static void __init relocate_initrd(void)
u64 ramdisk_image = get_ramdisk_image();
u64 ramdisk_size = get_ramdisk_size();
u64 area_size = PAGE_ALIGN(ramdisk_size);
- u64 ramdisk_here;
unsigned long slop, clen, mapaddr;
char *p, *q;
/* We need to move the initrd down into directly mapped mem */
- ramdisk_here = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
- area_size, PAGE_SIZE);
+ relocated_ramdisk = memblock_find_in_range(0, PFN_PHYS(max_pfn_mapped),
+ area_size, PAGE_SIZE);
- if (!ramdisk_here)
+ if (!relocated_ramdisk)
panic("Cannot find place for new RAMDISK of size %lld\n",
- ramdisk_size);
+ ramdisk_size);
/* Note: this includes all the mem currently occupied by
the initrd, we rely on that fact to keep the data intact. */
- memblock_reserve(ramdisk_here, area_size);
- initrd_start = ramdisk_here + PAGE_OFFSET;
+ memblock_reserve(relocated_ramdisk, area_size);
+ initrd_start = relocated_ramdisk + PAGE_OFFSET;
initrd_end = initrd_start + ramdisk_size;
printk(KERN_INFO "Allocated new RAMDISK: [mem %#010llx-%#010llx]\n",
- ramdisk_here, ramdisk_here + ramdisk_size - 1);
+ relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
q = (char *)initrd_start;
@@ -363,7 +364,7 @@ static void __init relocate_initrd(void)
printk(KERN_INFO "Move RAMDISK from [mem %#010llx-%#010llx] to"
" [mem %#010llx-%#010llx]\n",
ramdisk_image, ramdisk_image + ramdisk_size - 1,
- ramdisk_here, ramdisk_here + ramdisk_size - 1);
+ relocated_ramdisk, relocated_ramdisk + ramdisk_size - 1);
}
static void __init early_reserve_initrd(void)