2005-06-26 05:58:02 +08:00
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/*
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2007-10-13 09:10:53 +08:00
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* handle transition of Linux booting another kernel
|
2005-06-26 05:58:02 +08:00
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* Copyright (C) 2002-2005 Eric Biederman <ebiederm@xmission.com>
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*
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* This source code is licensed under the GNU General Public License,
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* Version 2. See the file COPYING for more details.
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*/
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|
2014-08-09 05:26:04 +08:00
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|
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#define pr_fmt(fmt) "kexec: " fmt
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|
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2005-06-26 05:58:02 +08:00
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|
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#include <linux/mm.h>
|
|
|
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#include <linux/kexec.h>
|
|
|
|
#include <linux/string.h>
|
include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h
percpu.h is included by sched.h and module.h and thus ends up being
included when building most .c files. percpu.h includes slab.h which
in turn includes gfp.h making everything defined by the two files
universally available and complicating inclusion dependencies.
percpu.h -> slab.h dependency is about to be removed. Prepare for
this change by updating users of gfp and slab facilities include those
headers directly instead of assuming availability. As this conversion
needs to touch large number of source files, the following script is
used as the basis of conversion.
http://userweb.kernel.org/~tj/misc/slabh-sweep.py
The script does the followings.
* Scan files for gfp and slab usages and update includes such that
only the necessary includes are there. ie. if only gfp is used,
gfp.h, if slab is used, slab.h.
* When the script inserts a new include, it looks at the include
blocks and try to put the new include such that its order conforms
to its surrounding. It's put in the include block which contains
core kernel includes, in the same order that the rest are ordered -
alphabetical, Christmas tree, rev-Xmas-tree or at the end if there
doesn't seem to be any matching order.
* If the script can't find a place to put a new include (mostly
because the file doesn't have fitting include block), it prints out
an error message indicating which .h file needs to be added to the
file.
The conversion was done in the following steps.
1. The initial automatic conversion of all .c files updated slightly
over 4000 files, deleting around 700 includes and adding ~480 gfp.h
and ~3000 slab.h inclusions. The script emitted errors for ~400
files.
2. Each error was manually checked. Some didn't need the inclusion,
some needed manual addition while adding it to implementation .h or
embedding .c file was more appropriate for others. This step added
inclusions to around 150 files.
3. The script was run again and the output was compared to the edits
from #2 to make sure no file was left behind.
4. Several build tests were done and a couple of problems were fixed.
e.g. lib/decompress_*.c used malloc/free() wrappers around slab
APIs requiring slab.h to be added manually.
5. The script was run on all .h files but without automatically
editing them as sprinkling gfp.h and slab.h inclusions around .h
files could easily lead to inclusion dependency hell. Most gfp.h
inclusion directives were ignored as stuff from gfp.h was usually
wildly available and often used in preprocessor macros. Each
slab.h inclusion directive was examined and added manually as
necessary.
6. percpu.h was updated not to include slab.h.
7. Build test were done on the following configurations and failures
were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my
distributed build env didn't work with gcov compiles) and a few
more options had to be turned off depending on archs to make things
build (like ipr on powerpc/64 which failed due to missing writeq).
* x86 and x86_64 UP and SMP allmodconfig and a custom test config.
* powerpc and powerpc64 SMP allmodconfig
* sparc and sparc64 SMP allmodconfig
* ia64 SMP allmodconfig
* s390 SMP allmodconfig
* alpha SMP allmodconfig
* um on x86_64 SMP allmodconfig
8. percpu.h modifications were reverted so that it could be applied as
a separate patch and serve as bisection point.
Given the fact that I had only a couple of failures from tests on step
6, I'm fairly confident about the coverage of this conversion patch.
If there is a breakage, it's likely to be something in one of the arch
headers which should be easily discoverable easily on most builds of
the specific arch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
2010-03-24 16:04:11 +08:00
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#include <linux/gfp.h>
|
2005-06-26 05:58:02 +08:00
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#include <linux/reboot.h>
|
2007-10-17 14:27:27 +08:00
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#include <linux/numa.h>
|
2008-05-13 03:20:43 +08:00
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|
#include <linux/ftrace.h>
|
2009-03-10 10:56:57 +08:00
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|
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#include <linux/io.h>
|
2009-03-10 10:57:16 +08:00
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|
|
#include <linux/suspend.h>
|
2015-06-02 17:01:38 +08:00
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|
|
#include <linux/vmalloc.h>
|
2008-05-13 03:20:43 +08:00
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|
2013-01-25 04:20:04 +08:00
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#include <asm/init.h>
|
2005-06-26 05:58:02 +08:00
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#include <asm/pgtable.h>
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#include <asm/tlbflush.h>
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#include <asm/mmu_context.h>
|
2014-10-27 16:12:04 +08:00
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|
|
#include <asm/io_apic.h>
|
2009-06-02 02:16:03 +08:00
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|
|
#include <asm/debugreg.h>
|
2014-08-09 05:26:06 +08:00
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|
|
#include <asm/kexec-bzimage64.h>
|
2015-04-27 19:17:19 +08:00
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|
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#include <asm/setup.h>
|
2017-05-09 06:58:11 +08:00
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|
#include <asm/set_memory.h>
|
2005-07-30 03:25:28 +08:00
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|
|
|
2014-08-30 06:18:46 +08:00
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|
|
#ifdef CONFIG_KEXEC_FILE
|
2018-04-14 06:35:49 +08:00
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|
|
const struct kexec_file_ops * const kexec_file_loaders[] = {
|
2014-08-09 05:26:06 +08:00
|
|
|
&kexec_bzImage64_ops,
|
2018-04-14 06:35:49 +08:00
|
|
|
NULL
|
2014-08-09 05:25:57 +08:00
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|
|
};
|
2014-08-30 06:18:46 +08:00
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|
|
#endif
|
2014-08-09 05:25:57 +08:00
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|
|
|
2009-02-03 14:22:48 +08:00
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|
static void free_transition_pgtable(struct kimage *image)
|
|
|
|
{
|
2017-03-18 02:55:10 +08:00
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|
|
free_page((unsigned long)image->arch.p4d);
|
2018-05-09 18:42:20 +08:00
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|
|
image->arch.p4d = NULL;
|
2009-02-03 14:22:48 +08:00
|
|
|
free_page((unsigned long)image->arch.pud);
|
2018-05-09 18:42:20 +08:00
|
|
|
image->arch.pud = NULL;
|
2009-02-03 14:22:48 +08:00
|
|
|
free_page((unsigned long)image->arch.pmd);
|
2018-05-09 18:42:20 +08:00
|
|
|
image->arch.pmd = NULL;
|
2009-02-03 14:22:48 +08:00
|
|
|
free_page((unsigned long)image->arch.pte);
|
2018-05-09 18:42:20 +08:00
|
|
|
image->arch.pte = NULL;
|
2009-02-03 14:22:48 +08:00
|
|
|
}
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static int init_transition_pgtable(struct kimage *image, pgd_t *pgd)
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|
|
{
|
2017-03-18 02:55:10 +08:00
|
|
|
p4d_t *p4d;
|
2009-02-03 14:22:48 +08:00
|
|
|
pud_t *pud;
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|
pmd_t *pmd;
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|
pte_t *pte;
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|
|
|
unsigned long vaddr, paddr;
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|
|
int result = -ENOMEM;
|
|
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vaddr = (unsigned long)relocate_kernel;
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|
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|
paddr = __pa(page_address(image->control_code_page)+PAGE_SIZE);
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|
|
pgd += pgd_index(vaddr);
|
|
|
|
if (!pgd_present(*pgd)) {
|
2017-03-18 02:55:10 +08:00
|
|
|
p4d = (p4d_t *)get_zeroed_page(GFP_KERNEL);
|
|
|
|
if (!p4d)
|
|
|
|
goto err;
|
|
|
|
image->arch.p4d = p4d;
|
|
|
|
set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE));
|
|
|
|
}
|
|
|
|
p4d = p4d_offset(pgd, vaddr);
|
|
|
|
if (!p4d_present(*p4d)) {
|
2009-02-03 14:22:48 +08:00
|
|
|
pud = (pud_t *)get_zeroed_page(GFP_KERNEL);
|
|
|
|
if (!pud)
|
|
|
|
goto err;
|
|
|
|
image->arch.pud = pud;
|
2017-03-18 02:55:10 +08:00
|
|
|
set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE));
|
2009-02-03 14:22:48 +08:00
|
|
|
}
|
2017-03-18 02:55:10 +08:00
|
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|
pud = pud_offset(p4d, vaddr);
|
2009-02-03 14:22:48 +08:00
|
|
|
if (!pud_present(*pud)) {
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|
|
|
pmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
|
|
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|
if (!pmd)
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|
goto err;
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|
image->arch.pmd = pmd;
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|
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE));
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|
}
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|
pmd = pmd_offset(pud, vaddr);
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|
|
|
if (!pmd_present(*pmd)) {
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pte = (pte_t *)get_zeroed_page(GFP_KERNEL);
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|
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|
if (!pte)
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|
goto err;
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image->arch.pte = pte;
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set_pmd(pmd, __pmd(__pa(pte) | _KERNPG_TABLE));
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}
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|
pte = pte_offset_kernel(pmd, vaddr);
|
2017-07-18 05:10:28 +08:00
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|
set_pte(pte, pfn_pte(paddr >> PAGE_SHIFT, PAGE_KERNEL_EXEC_NOENC));
|
2009-02-03 14:22:48 +08:00
|
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|
return 0;
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err:
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|
return result;
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}
|
|
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|
|
2013-01-25 04:20:04 +08:00
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static void *alloc_pgt_page(void *data)
|
|
|
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{
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|
struct kimage *image = (struct kimage *)data;
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struct page *page;
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void *p = NULL;
|
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|
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page = kimage_alloc_control_pages(image, 0);
|
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|
if (page) {
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|
p = page_address(page);
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|
clear_page(p);
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|
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|
}
|
|
|
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|
|
|
return p;
|
|
|
|
}
|
|
|
|
|
2005-06-26 05:58:02 +08:00
|
|
|
static int init_pgtable(struct kimage *image, unsigned long start_pgtable)
|
|
|
|
{
|
2013-01-25 04:20:04 +08:00
|
|
|
struct x86_mapping_info info = {
|
|
|
|
.alloc_pgt_page = alloc_pgt_page,
|
|
|
|
.context = image,
|
2017-05-04 09:42:50 +08:00
|
|
|
.page_flag = __PAGE_KERNEL_LARGE_EXEC,
|
2017-07-18 05:10:28 +08:00
|
|
|
.kernpg_flag = _KERNPG_TABLE_NOENC,
|
2013-01-25 04:20:04 +08:00
|
|
|
};
|
2013-01-25 04:20:03 +08:00
|
|
|
unsigned long mstart, mend;
|
2005-07-30 03:25:28 +08:00
|
|
|
pgd_t *level4p;
|
2009-02-03 14:22:48 +08:00
|
|
|
int result;
|
2013-01-25 04:20:03 +08:00
|
|
|
int i;
|
|
|
|
|
2005-07-30 03:25:28 +08:00
|
|
|
level4p = (pgd_t *)__va(start_pgtable);
|
2013-01-25 04:20:04 +08:00
|
|
|
clear_page(level4p);
|
2017-05-04 09:42:51 +08:00
|
|
|
|
|
|
|
if (direct_gbpages)
|
|
|
|
info.direct_gbpages = true;
|
|
|
|
|
2013-01-25 04:20:05 +08:00
|
|
|
for (i = 0; i < nr_pfn_mapped; i++) {
|
|
|
|
mstart = pfn_mapped[i].start << PAGE_SHIFT;
|
|
|
|
mend = pfn_mapped[i].end << PAGE_SHIFT;
|
|
|
|
|
|
|
|
result = kernel_ident_mapping_init(&info,
|
|
|
|
level4p, mstart, mend);
|
|
|
|
if (result)
|
|
|
|
return result;
|
|
|
|
}
|
2013-01-25 04:20:03 +08:00
|
|
|
|
2009-03-10 10:57:04 +08:00
|
|
|
/*
|
2013-01-25 04:20:03 +08:00
|
|
|
* segments's mem ranges could be outside 0 ~ max_pfn,
|
|
|
|
* for example when jump back to original kernel from kexeced kernel.
|
|
|
|
* or first kernel is booted with user mem map, and second kernel
|
|
|
|
* could be loaded out of that range.
|
2009-03-10 10:57:04 +08:00
|
|
|
*/
|
2013-01-25 04:20:03 +08:00
|
|
|
for (i = 0; i < image->nr_segments; i++) {
|
|
|
|
mstart = image->segment[i].mem;
|
|
|
|
mend = mstart + image->segment[i].memsz;
|
|
|
|
|
2013-01-25 04:20:04 +08:00
|
|
|
result = kernel_ident_mapping_init(&info,
|
|
|
|
level4p, mstart, mend);
|
2013-01-25 04:20:03 +08:00
|
|
|
|
|
|
|
if (result)
|
|
|
|
return result;
|
|
|
|
}
|
|
|
|
|
2009-02-03 14:22:48 +08:00
|
|
|
return init_transition_pgtable(image, level4p);
|
2005-06-26 05:58:02 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void set_idt(void *newidt, u16 limit)
|
|
|
|
{
|
2005-07-30 03:02:09 +08:00
|
|
|
struct desc_ptr curidt;
|
2005-06-26 05:58:02 +08:00
|
|
|
|
|
|
|
/* x86-64 supports unaliged loads & stores */
|
2005-07-30 03:02:09 +08:00
|
|
|
curidt.size = limit;
|
|
|
|
curidt.address = (unsigned long)newidt;
|
2005-06-26 05:58:02 +08:00
|
|
|
|
|
|
|
__asm__ __volatile__ (
|
2005-07-30 03:02:09 +08:00
|
|
|
"lidtq %0\n"
|
|
|
|
: : "m" (curidt)
|
2005-06-26 05:58:02 +08:00
|
|
|
);
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
|
|
static void set_gdt(void *newgdt, u16 limit)
|
|
|
|
{
|
2005-07-30 03:02:09 +08:00
|
|
|
struct desc_ptr curgdt;
|
2005-06-26 05:58:02 +08:00
|
|
|
|
|
|
|
/* x86-64 supports unaligned loads & stores */
|
2005-07-30 03:02:09 +08:00
|
|
|
curgdt.size = limit;
|
|
|
|
curgdt.address = (unsigned long)newgdt;
|
2005-06-26 05:58:02 +08:00
|
|
|
|
|
|
|
__asm__ __volatile__ (
|
2005-07-30 03:02:09 +08:00
|
|
|
"lgdtq %0\n"
|
|
|
|
: : "m" (curgdt)
|
2005-06-26 05:58:02 +08:00
|
|
|
);
|
|
|
|
};
|
|
|
|
|
|
|
|
static void load_segments(void)
|
|
|
|
{
|
|
|
|
__asm__ __volatile__ (
|
2005-07-30 03:02:09 +08:00
|
|
|
"\tmovl %0,%%ds\n"
|
|
|
|
"\tmovl %0,%%es\n"
|
|
|
|
"\tmovl %0,%%ss\n"
|
|
|
|
"\tmovl %0,%%fs\n"
|
|
|
|
"\tmovl %0,%%gs\n"
|
2006-03-08 13:55:48 +08:00
|
|
|
: : "a" (__KERNEL_DS) : "memory"
|
2005-06-26 05:58:02 +08:00
|
|
|
);
|
|
|
|
}
|
|
|
|
|
2014-08-30 06:18:46 +08:00
|
|
|
#ifdef CONFIG_KEXEC_FILE
|
2014-08-09 05:26:09 +08:00
|
|
|
/* Update purgatory as needed after various image segments have been prepared */
|
|
|
|
static int arch_update_purgatory(struct kimage *image)
|
|
|
|
{
|
|
|
|
int ret = 0;
|
|
|
|
|
|
|
|
if (!image->file_mode)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
/* Setup copying of backup region */
|
|
|
|
if (image->type == KEXEC_TYPE_CRASH) {
|
2017-03-10 20:17:18 +08:00
|
|
|
ret = kexec_purgatory_get_set_symbol(image,
|
|
|
|
"purgatory_backup_dest",
|
2014-08-09 05:26:09 +08:00
|
|
|
&image->arch.backup_load_addr,
|
|
|
|
sizeof(image->arch.backup_load_addr), 0);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2017-03-10 20:17:18 +08:00
|
|
|
ret = kexec_purgatory_get_set_symbol(image,
|
|
|
|
"purgatory_backup_src",
|
2014-08-09 05:26:09 +08:00
|
|
|
&image->arch.backup_src_start,
|
|
|
|
sizeof(image->arch.backup_src_start), 0);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
|
2017-03-10 20:17:18 +08:00
|
|
|
ret = kexec_purgatory_get_set_symbol(image,
|
|
|
|
"purgatory_backup_sz",
|
2014-08-09 05:26:09 +08:00
|
|
|
&image->arch.backup_src_sz,
|
|
|
|
sizeof(image->arch.backup_src_sz), 0);
|
|
|
|
if (ret)
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
|
|
|
return ret;
|
|
|
|
}
|
2014-08-30 06:18:46 +08:00
|
|
|
#else /* !CONFIG_KEXEC_FILE */
|
|
|
|
static inline int arch_update_purgatory(struct kimage *image)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
#endif /* CONFIG_KEXEC_FILE */
|
2014-08-09 05:26:09 +08:00
|
|
|
|
2005-06-26 05:58:02 +08:00
|
|
|
int machine_kexec_prepare(struct kimage *image)
|
|
|
|
{
|
2006-09-26 16:52:38 +08:00
|
|
|
unsigned long start_pgtable;
|
2005-06-26 05:58:02 +08:00
|
|
|
int result;
|
|
|
|
|
|
|
|
/* Calculate the offsets */
|
2005-06-26 05:58:28 +08:00
|
|
|
start_pgtable = page_to_pfn(image->control_code_page) << PAGE_SHIFT;
|
2005-06-26 05:58:02 +08:00
|
|
|
|
|
|
|
/* Setup the identity mapped 64bit page table */
|
|
|
|
result = init_pgtable(image, start_pgtable);
|
2005-06-26 05:58:28 +08:00
|
|
|
if (result)
|
2005-06-26 05:58:02 +08:00
|
|
|
return result;
|
|
|
|
|
2014-08-09 05:26:09 +08:00
|
|
|
/* update purgatory as needed */
|
|
|
|
result = arch_update_purgatory(image);
|
|
|
|
if (result)
|
|
|
|
return result;
|
|
|
|
|
2005-06-26 05:58:02 +08:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
void machine_kexec_cleanup(struct kimage *image)
|
|
|
|
{
|
2009-02-03 14:22:48 +08:00
|
|
|
free_transition_pgtable(image);
|
2005-06-26 05:58:02 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Do not allocate memory (or fail in any way) in machine_kexec().
|
|
|
|
* We are past the point of no return, committed to rebooting now.
|
|
|
|
*/
|
2008-07-26 10:45:07 +08:00
|
|
|
void machine_kexec(struct kimage *image)
|
2005-06-26 05:58:02 +08:00
|
|
|
{
|
2006-09-26 16:52:38 +08:00
|
|
|
unsigned long page_list[PAGES_NR];
|
|
|
|
void *control_page;
|
2009-03-10 10:57:16 +08:00
|
|
|
int save_ftrace_enabled;
|
2005-06-26 05:58:02 +08:00
|
|
|
|
2009-03-10 10:57:16 +08:00
|
|
|
#ifdef CONFIG_KEXEC_JUMP
|
2009-05-08 10:51:41 +08:00
|
|
|
if (image->preserve_context)
|
2009-03-10 10:57:16 +08:00
|
|
|
save_processor_state();
|
|
|
|
#endif
|
|
|
|
|
|
|
|
save_ftrace_enabled = __ftrace_enabled_save();
|
2008-05-13 03:20:43 +08:00
|
|
|
|
2005-06-26 05:58:02 +08:00
|
|
|
/* Interrupts aren't acceptable while we reboot */
|
|
|
|
local_irq_disable();
|
2009-06-02 02:16:03 +08:00
|
|
|
hw_breakpoint_disable();
|
2005-06-26 05:58:02 +08:00
|
|
|
|
2009-03-10 10:57:16 +08:00
|
|
|
if (image->preserve_context) {
|
|
|
|
#ifdef CONFIG_X86_IO_APIC
|
|
|
|
/*
|
|
|
|
* We need to put APICs in legacy mode so that we can
|
|
|
|
* get timer interrupts in second kernel. kexec/kdump
|
2018-02-14 13:46:54 +08:00
|
|
|
* paths already have calls to restore_boot_irq_mode()
|
|
|
|
* in one form or other. kexec jump path also need one.
|
2009-03-10 10:57:16 +08:00
|
|
|
*/
|
2018-02-14 13:46:52 +08:00
|
|
|
clear_IO_APIC();
|
|
|
|
restore_boot_irq_mode();
|
2009-03-10 10:57:16 +08:00
|
|
|
#endif
|
|
|
|
}
|
|
|
|
|
2006-09-26 16:52:38 +08:00
|
|
|
control_page = page_address(image->control_code_page) + PAGE_SIZE;
|
2009-03-10 10:57:16 +08:00
|
|
|
memcpy(control_page, relocate_kernel, KEXEC_CONTROL_CODE_MAX_SIZE);
|
2006-09-26 16:52:38 +08:00
|
|
|
|
Revert "[PATCH] x86: __pa and __pa_symbol address space separation"
This was broken. It adds complexity, for no good reason. Rather than
separate __pa() and __pa_symbol(), we should deprecate __pa_symbol(),
and preferably __pa() too - and just use "virt_to_phys()" instead, which
is more readable and has nicer semantics.
However, right now, just undo the separation, and make __pa_symbol() be
the exact same as __pa(). That fixes the bugs this patch introduced,
and we can do the fairly obvious cleanups later.
Do the new __phys_addr() function (which is now the actual workhorse for
the unified __pa()/__pa_symbol()) as a real external function, that way
all the potential issues with compile/link-time optimizations of
constant symbol addresses go away, and we can also, if we choose to, add
more sanity-checking of the argument.
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Vivek Goyal <vgoyal@in.ibm.com>
Cc: Andi Kleen <ak@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-07 23:44:24 +08:00
|
|
|
page_list[PA_CONTROL_PAGE] = virt_to_phys(control_page);
|
2009-03-10 10:57:16 +08:00
|
|
|
page_list[VA_CONTROL_PAGE] = (unsigned long)control_page;
|
2006-09-26 16:52:38 +08:00
|
|
|
page_list[PA_TABLE_PAGE] =
|
|
|
|
(unsigned long)__pa(page_address(image->control_code_page));
|
2005-06-26 05:58:02 +08:00
|
|
|
|
2009-03-10 10:57:16 +08:00
|
|
|
if (image->type == KEXEC_TYPE_DEFAULT)
|
|
|
|
page_list[PA_SWAP_PAGE] = (page_to_pfn(image->swap_page)
|
|
|
|
<< PAGE_SHIFT);
|
|
|
|
|
2009-03-10 10:56:57 +08:00
|
|
|
/*
|
|
|
|
* The segment registers are funny things, they have both a
|
2006-07-30 18:03:20 +08:00
|
|
|
* visible and an invisible part. Whenever the visible part is
|
|
|
|
* set to a specific selector, the invisible part is loaded
|
|
|
|
* with from a table in memory. At no other time is the
|
|
|
|
* descriptor table in memory accessed.
|
2005-06-26 05:58:02 +08:00
|
|
|
*
|
|
|
|
* I take advantage of this here by force loading the
|
|
|
|
* segments, before I zap the gdt with an invalid value.
|
|
|
|
*/
|
|
|
|
load_segments();
|
2009-03-10 10:56:57 +08:00
|
|
|
/*
|
|
|
|
* The gdt & idt are now invalid.
|
2005-06-26 05:58:02 +08:00
|
|
|
* If you want to load them you must set up your own idt & gdt.
|
|
|
|
*/
|
2009-03-10 10:56:57 +08:00
|
|
|
set_gdt(phys_to_virt(0), 0);
|
|
|
|
set_idt(phys_to_virt(0), 0);
|
2006-09-26 16:52:38 +08:00
|
|
|
|
2005-06-26 05:58:02 +08:00
|
|
|
/* now call it */
|
2009-03-10 10:57:16 +08:00
|
|
|
image->start = relocate_kernel((unsigned long)image->head,
|
|
|
|
(unsigned long)page_list,
|
|
|
|
image->start,
|
2017-07-29 00:01:16 +08:00
|
|
|
image->preserve_context,
|
|
|
|
sme_active());
|
2009-03-10 10:57:16 +08:00
|
|
|
|
|
|
|
#ifdef CONFIG_KEXEC_JUMP
|
2009-05-08 10:51:41 +08:00
|
|
|
if (image->preserve_context)
|
2009-03-10 10:57:16 +08:00
|
|
|
restore_processor_state();
|
|
|
|
#endif
|
|
|
|
|
|
|
|
__ftrace_enabled_restore(save_ftrace_enabled);
|
2005-06-26 05:58:02 +08:00
|
|
|
}
|
2006-09-26 16:52:32 +08:00
|
|
|
|
2007-10-17 14:27:27 +08:00
|
|
|
void arch_crash_save_vmcoreinfo(void)
|
|
|
|
{
|
2016-12-15 07:04:20 +08:00
|
|
|
VMCOREINFO_NUMBER(phys_base);
|
2017-06-06 19:31:27 +08:00
|
|
|
VMCOREINFO_SYMBOL(init_top_pgt);
|
2018-05-18 18:35:24 +08:00
|
|
|
vmcoreinfo_append_str("NUMBER(pgtable_l5_enabled)=%d\n",
|
|
|
|
pgtable_l5_enabled());
|
2008-02-07 16:15:23 +08:00
|
|
|
|
|
|
|
#ifdef CONFIG_NUMA
|
|
|
|
VMCOREINFO_SYMBOL(node_data);
|
|
|
|
VMCOREINFO_LENGTH(node_data, MAX_NUMNODES);
|
|
|
|
#endif
|
2014-01-24 01:31:20 +08:00
|
|
|
vmcoreinfo_append_str("KERNELOFFSET=%lx\n",
|
2015-04-27 19:17:19 +08:00
|
|
|
kaslr_offset());
|
2016-12-15 07:04:20 +08:00
|
|
|
VMCOREINFO_NUMBER(KERNEL_IMAGE_SIZE);
|
2007-10-17 14:27:27 +08:00
|
|
|
}
|
|
|
|
|
2014-08-09 05:25:57 +08:00
|
|
|
/* arch-dependent functionality related to kexec file-based syscall */
|
|
|
|
|
2014-08-30 06:18:46 +08:00
|
|
|
#ifdef CONFIG_KEXEC_FILE
|
2014-08-09 05:25:57 +08:00
|
|
|
void *arch_kexec_kernel_image_load(struct kimage *image)
|
|
|
|
{
|
2014-08-09 05:26:09 +08:00
|
|
|
vfree(image->arch.elf_headers);
|
|
|
|
image->arch.elf_headers = NULL;
|
|
|
|
|
2014-08-09 05:25:57 +08:00
|
|
|
if (!image->fops || !image->fops->load)
|
|
|
|
return ERR_PTR(-ENOEXEC);
|
|
|
|
|
|
|
|
return image->fops->load(image, image->kernel_buf,
|
|
|
|
image->kernel_buf_len, image->initrd_buf,
|
|
|
|
image->initrd_buf_len, image->cmdline_buf,
|
|
|
|
image->cmdline_buf_len);
|
|
|
|
}
|
|
|
|
|
2014-08-09 05:26:04 +08:00
|
|
|
/*
|
|
|
|
* Apply purgatory relocations.
|
|
|
|
*
|
2018-04-14 06:36:24 +08:00
|
|
|
* @pi: Purgatory to be relocated.
|
|
|
|
* @section: Section relocations applying to.
|
|
|
|
* @relsec: Section containing RELAs.
|
|
|
|
* @symtabsec: Corresponding symtab.
|
2014-08-09 05:26:04 +08:00
|
|
|
*
|
|
|
|
* TODO: Some of the code belongs to generic code. Move that in kexec.c.
|
|
|
|
*/
|
2018-04-14 06:36:24 +08:00
|
|
|
int arch_kexec_apply_relocations_add(struct purgatory_info *pi,
|
|
|
|
Elf_Shdr *section, const Elf_Shdr *relsec,
|
|
|
|
const Elf_Shdr *symtabsec)
|
2014-08-09 05:26:04 +08:00
|
|
|
{
|
|
|
|
unsigned int i;
|
|
|
|
Elf64_Rela *rel;
|
|
|
|
Elf64_Sym *sym;
|
|
|
|
void *location;
|
|
|
|
unsigned long address, sec_base, value;
|
|
|
|
const char *strtab, *name, *shstrtab;
|
2018-04-14 06:36:24 +08:00
|
|
|
const Elf_Shdr *sechdrs;
|
2014-08-09 05:26:04 +08:00
|
|
|
|
2018-04-14 06:36:24 +08:00
|
|
|
/* String & section header string table */
|
|
|
|
sechdrs = (void *)pi->ehdr + pi->ehdr->e_shoff;
|
|
|
|
strtab = (char *)pi->ehdr + sechdrs[symtabsec->sh_link].sh_offset;
|
|
|
|
shstrtab = (char *)pi->ehdr + sechdrs[pi->ehdr->e_shstrndx].sh_offset;
|
2014-08-09 05:26:04 +08:00
|
|
|
|
2018-04-14 06:36:24 +08:00
|
|
|
rel = (void *)pi->ehdr + relsec->sh_offset;
|
2014-08-09 05:26:04 +08:00
|
|
|
|
2018-04-14 06:36:24 +08:00
|
|
|
pr_debug("Applying relocate section %s to %u\n",
|
|
|
|
shstrtab + relsec->sh_name, relsec->sh_info);
|
2014-08-09 05:26:04 +08:00
|
|
|
|
2018-04-14 06:36:24 +08:00
|
|
|
for (i = 0; i < relsec->sh_size / sizeof(*rel); i++) {
|
2014-08-09 05:26:04 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* rel[i].r_offset contains byte offset from beginning
|
|
|
|
* of section to the storage unit affected.
|
|
|
|
*
|
2018-04-14 06:36:39 +08:00
|
|
|
* This is location to update. This is temporary buffer
|
|
|
|
* where section is currently loaded. This will finally be
|
|
|
|
* loaded to a different address later, pointed to by
|
2014-08-09 05:26:04 +08:00
|
|
|
* ->sh_addr. kexec takes care of moving it
|
|
|
|
* (kexec_load_segment()).
|
|
|
|
*/
|
2018-04-14 06:36:39 +08:00
|
|
|
location = pi->purgatory_buf;
|
|
|
|
location += section->sh_offset;
|
|
|
|
location += rel[i].r_offset;
|
2014-08-09 05:26:04 +08:00
|
|
|
|
|
|
|
/* Final address of the location */
|
|
|
|
address = section->sh_addr + rel[i].r_offset;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* rel[i].r_info contains information about symbol table index
|
|
|
|
* w.r.t which relocation must be made and type of relocation
|
|
|
|
* to apply. ELF64_R_SYM() and ELF64_R_TYPE() macros get
|
|
|
|
* these respectively.
|
|
|
|
*/
|
2018-04-14 06:36:24 +08:00
|
|
|
sym = (void *)pi->ehdr + symtabsec->sh_offset;
|
|
|
|
sym += ELF64_R_SYM(rel[i].r_info);
|
2014-08-09 05:26:04 +08:00
|
|
|
|
|
|
|
if (sym->st_name)
|
|
|
|
name = strtab + sym->st_name;
|
|
|
|
else
|
|
|
|
name = shstrtab + sechdrs[sym->st_shndx].sh_name;
|
|
|
|
|
|
|
|
pr_debug("Symbol: %s info: %02x shndx: %02x value=%llx size: %llx\n",
|
|
|
|
name, sym->st_info, sym->st_shndx, sym->st_value,
|
|
|
|
sym->st_size);
|
|
|
|
|
|
|
|
if (sym->st_shndx == SHN_UNDEF) {
|
|
|
|
pr_err("Undefined symbol: %s\n", name);
|
|
|
|
return -ENOEXEC;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sym->st_shndx == SHN_COMMON) {
|
|
|
|
pr_err("symbol '%s' in common section\n", name);
|
|
|
|
return -ENOEXEC;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (sym->st_shndx == SHN_ABS)
|
|
|
|
sec_base = 0;
|
2018-04-14 06:36:24 +08:00
|
|
|
else if (sym->st_shndx >= pi->ehdr->e_shnum) {
|
2014-08-09 05:26:04 +08:00
|
|
|
pr_err("Invalid section %d for symbol %s\n",
|
|
|
|
sym->st_shndx, name);
|
|
|
|
return -ENOEXEC;
|
|
|
|
} else
|
2018-04-14 06:36:24 +08:00
|
|
|
sec_base = pi->sechdrs[sym->st_shndx].sh_addr;
|
2014-08-09 05:26:04 +08:00
|
|
|
|
|
|
|
value = sym->st_value;
|
|
|
|
value += sec_base;
|
|
|
|
value += rel[i].r_addend;
|
|
|
|
|
|
|
|
switch (ELF64_R_TYPE(rel[i].r_info)) {
|
|
|
|
case R_X86_64_NONE:
|
|
|
|
break;
|
|
|
|
case R_X86_64_64:
|
|
|
|
*(u64 *)location = value;
|
|
|
|
break;
|
|
|
|
case R_X86_64_32:
|
|
|
|
*(u32 *)location = value;
|
|
|
|
if (value != *(u32 *)location)
|
|
|
|
goto overflow;
|
|
|
|
break;
|
|
|
|
case R_X86_64_32S:
|
|
|
|
*(s32 *)location = value;
|
|
|
|
if ((s64)value != *(s32 *)location)
|
|
|
|
goto overflow;
|
|
|
|
break;
|
|
|
|
case R_X86_64_PC32:
|
x86: Treat R_X86_64_PLT32 as R_X86_64_PC32
On i386, there are 2 types of PLTs, PIC and non-PIC. PIE and shared
objects must use PIC PLT. To use PIC PLT, you need to load
_GLOBAL_OFFSET_TABLE_ into EBX first. There is no need for that on
x86-64 since x86-64 uses PC-relative PLT.
On x86-64, for 32-bit PC-relative branches, we can generate PLT32
relocation, instead of PC32 relocation, which can also be used as
a marker for 32-bit PC-relative branches. Linker can always reduce
PLT32 relocation to PC32 if function is defined locally. Local
functions should use PC32 relocation. As far as Linux kernel is
concerned, R_X86_64_PLT32 can be treated the same as R_X86_64_PC32
since Linux kernel doesn't use PLT.
R_X86_64_PLT32 for 32-bit PC-relative branches has been enabled in
binutils master branch which will become binutils 2.31.
[ hjl is working on having better documentation on this all, but a few
more notes from him:
"PLT32 relocation is used as marker for PC-relative branches. Because
of EBX, it looks odd to generate PLT32 relocation on i386 when EBX
doesn't have GOT.
As for symbol resolution, PLT32 and PC32 relocations are almost
interchangeable. But when linker sees PLT32 relocation against a
protected symbol, it can resolved locally at link-time since it is
used on a branch instruction. Linker can't do that for PC32
relocation"
but for the kernel use, the two are basically the same, and this
commit gets things building and working with the current binutils
master - Linus ]
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-02-08 06:20:09 +08:00
|
|
|
case R_X86_64_PLT32:
|
2014-08-09 05:26:04 +08:00
|
|
|
value -= (u64)address;
|
|
|
|
*(u32 *)location = value;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
pr_err("Unknown rela relocation: %llu\n",
|
|
|
|
ELF64_R_TYPE(rel[i].r_info));
|
|
|
|
return -ENOEXEC;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
overflow:
|
|
|
|
pr_err("Overflow in relocation type %d value 0x%lx\n",
|
|
|
|
(int)ELF64_R_TYPE(rel[i].r_info), value);
|
|
|
|
return -ENOEXEC;
|
|
|
|
}
|
2014-08-30 06:18:46 +08:00
|
|
|
#endif /* CONFIG_KEXEC_FILE */
|
2016-05-24 07:24:13 +08:00
|
|
|
|
|
|
|
static int
|
|
|
|
kexec_mark_range(unsigned long start, unsigned long end, bool protect)
|
|
|
|
{
|
|
|
|
struct page *page;
|
|
|
|
unsigned int nr_pages;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* For physical range: [start, end]. We must skip the unassigned
|
|
|
|
* crashk resource with zero-valued "end" member.
|
|
|
|
*/
|
|
|
|
if (!end || start > end)
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
page = pfn_to_page(start >> PAGE_SHIFT);
|
|
|
|
nr_pages = (end >> PAGE_SHIFT) - (start >> PAGE_SHIFT) + 1;
|
|
|
|
if (protect)
|
|
|
|
return set_pages_ro(page, nr_pages);
|
|
|
|
else
|
|
|
|
return set_pages_rw(page, nr_pages);
|
|
|
|
}
|
|
|
|
|
|
|
|
static void kexec_mark_crashkres(bool protect)
|
|
|
|
{
|
|
|
|
unsigned long control;
|
|
|
|
|
|
|
|
kexec_mark_range(crashk_low_res.start, crashk_low_res.end, protect);
|
|
|
|
|
|
|
|
/* Don't touch the control code page used in crash_kexec().*/
|
|
|
|
control = PFN_PHYS(page_to_pfn(kexec_crash_image->control_code_page));
|
|
|
|
/* Control code page is located in the 2nd page. */
|
|
|
|
kexec_mark_range(crashk_res.start, control + PAGE_SIZE - 1, protect);
|
|
|
|
control += KEXEC_CONTROL_PAGE_SIZE;
|
|
|
|
kexec_mark_range(control, crashk_res.end, protect);
|
|
|
|
}
|
|
|
|
|
|
|
|
void arch_kexec_protect_crashkres(void)
|
|
|
|
{
|
|
|
|
kexec_mark_crashkres(true);
|
|
|
|
}
|
|
|
|
|
|
|
|
void arch_kexec_unprotect_crashkres(void)
|
|
|
|
{
|
|
|
|
kexec_mark_crashkres(false);
|
|
|
|
}
|
2017-07-18 05:10:28 +08:00
|
|
|
|
|
|
|
int arch_kexec_post_alloc_pages(void *vaddr, unsigned int pages, gfp_t gfp)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* If SME is active we need to be sure that kexec pages are
|
|
|
|
* not encrypted because when we boot to the new kernel the
|
|
|
|
* pages won't be accessed encrypted (initially).
|
|
|
|
*/
|
|
|
|
return set_memory_decrypted((unsigned long)vaddr, pages);
|
|
|
|
}
|
|
|
|
|
|
|
|
void arch_kexec_pre_free_pages(void *vaddr, unsigned int pages)
|
|
|
|
{
|
|
|
|
/*
|
|
|
|
* If SME is active we need to reset the pages back to being
|
|
|
|
* an encrypted mapping before freeing them.
|
|
|
|
*/
|
|
|
|
set_memory_encrypted((unsigned long)vaddr, pages);
|
|
|
|
}
|