From 5aa3d718f259007121b9366d36315fb8a2983d3d Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Wed, 4 Dec 2013 20:50:42 +0100 Subject: [PATCH] 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 Tested-by: Aravind Gopalakrishnan --- arch/x86/include/asm/setup.h | 3 ++- arch/x86/kernel/setup.c | 19 ++++++++++--------- 2 files changed, 12 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/setup.h b/arch/x86/include/asm/setup.h index 59bcf4e..d62c9f8 100644 --- a/arch/x86/include/asm/setup.h +++ b/arch/x86/include/asm/setup.h @@ -3,7 +3,6 @@ #include - #define COMMAND_LINE_SIZE 2048 #include @@ -29,6 +28,8 @@ #include #include +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 cb233bc..baefc6d 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) -- 2.7.4