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[S390] hibernation: fix lowcore handling 

Our swsusp_arch_suspend() backend implementation disables prefixing
by setting the contents of the prefix register to 0.
However afterwards common code functions are called which might
access percpu data structures.
Since the lowcore contains e.g. the percpu base pointer this isn't
a good idea. So fix this by copying the hibernating cpu's lowcore to
absolute address zero.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2009-07-24 12:39:49 +02:00 committed by Martin Schwidefsky
parent 4be3bd7849
commit 5f954c3426
2 changed files with 10 additions and 7 deletions
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4
arch/s390/kernel/early.c
View File

@ -210,7 +210,7 @@ static noinline __init void detect_machine_type(void)
machine_flags |= MACHINE_FLAG_VM;
}
static void early_pgm_check_handler(void)
static __init void early_pgm_check_handler(void)
{
unsigned long addr;
const struct exception_table_entry *fixup;
@ -222,7 +222,7 @@ static void early_pgm_check_handler(void)
S390_lowcore.program_old_psw.addr = fixup->fixup | PSW_ADDR_AMODE;
}
void setup_lowcore_early(void)
static noinline __init void setup_lowcore_early(void)
{
psw_t psw;

13
arch/s390/power/swsusp_asm64.S
View File

@ -40,11 +40,11 @@ swsusp_arch_suspend:
/* Store prefix register on stack */
stpx __SF_EMPTY(%r15)
/* Setup base register for lowcore (absolute 0) */
llgf %r1,__SF_EMPTY(%r15)
/* Save prefix register contents for lowcore */
llgf %r4,__SF_EMPTY(%r15)
/* Get pointer to save area */
aghi %r1,0x1000
lghi %r1,0x1000
/* Store registers */
mvc 0x318(4,%r1),__SF_EMPTY(%r15) /* move prefix to lowcore */
@ -79,8 +79,11 @@ swsusp_arch_suspend:
xc __SF_EMPTY(4,%r15),__SF_EMPTY(%r15)
spx __SF_EMPTY(%r15)
/* Setup lowcore */
brasl %r14,setup_lowcore_early
lghi %r2,0
lghi %r3,2*PAGE_SIZE
lghi %r5,2*PAGE_SIZE
1: mvcle %r2,%r4,0
jo 1b
/* Save image */
brasl %r14,swsusp_save