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| author | Heiko Carstens <heiko.carstens@de.ibm.com> | 2009-09-22 22:58:44 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-09-22 22:58:44 +0200 |
| commit | 846955c8afe5ebca2f8841b042ca3342e08a092b (patch) | |
| tree | 85584d6f009932c18e55562c3303c6331aebe0ca /arch/s390/kernel/swsusp_asm64.S | |
| parent | 2e50195f58ec045bc4601ec94478d957974f4aa4 (diff) | |
| download | linux-next-846955c8afe5ebca2f8841b042ca3342e08a092b.tar.gz | |
[S390] hibernation: fix guest page hinting related crash
On resume the system that loads the to be resumed image might have
unstable pages.
When the resume image is copied back and a write access happen to an
unstable page this causes an exception and the system crashes.
To fix this set all free pages to stable before copying the resumed
image data. Also after everything has been restored set all free
pages of the resumed system to unstable again.
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/kernel/swsusp_asm64.S')
| -rw-r--r-- | arch/s390/kernel/swsusp_asm64.S | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/arch/s390/kernel/swsusp_asm64.S b/arch/s390/kernel/swsusp_asm64.S index 7cd6b096f0d1..9a86ccb91a8a 100644 --- a/arch/s390/kernel/swsusp_asm64.S +++ b/arch/s390/kernel/swsusp_asm64.S @@ -102,6 +102,9 @@ swsusp_arch_resume: aghi %r15,-STACK_FRAME_OVERHEAD stg %r1,__SF_BACKCHAIN(%r15) + /* Make all free pages stable */ + lghi %r2,1 + brasl %r14,arch_set_page_states #ifdef CONFIG_SMP /* Save boot cpu number */ brasl %r14,smp_get_phys_cpu_id @@ -178,6 +181,10 @@ swsusp_arch_resume: /* Activate DAT */ stosm __SF_EMPTY(%r15),0x04 + /* Make all free pages unstable */ + lghi %r2,0 + brasl %r14,arch_set_page_states + /* Return 0 */ lmg %r6,%r15,STACK_FRAME_OVERHEAD + __SF_GPRS(%r15) lghi %r2,0 |