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authorChristian Borntraeger <borntraeger@de.ibm.com>2011-09-20 17:07:28 +0200
committerHeiko Carstens <heiko.carstens@de.ibm.com>2011-09-20 17:07:34 +0200
commit480e5926ce3bb61ec229be2dab08bdce8abb8d2e (patch)
treeb252230da3bba55a8e4ebd747767257c781670d7 /arch/s390/mm/pgtable.c
parent9d037a777695993ec7437e5f451647dea7919d4c (diff)
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[S390] kvm: fix address mode switching
598841ca9919d008b520114d8a4378c4ce4e40a1 ([S390] use gmap address spaces for kvm guest images) changed kvm to use a separate address space for kvm guests. This address space was switched in __vcpu_run In some cases (preemption, page fault) there is the possibility that this address space switch is lost. The typical symptom was a huge amount of validity intercepts or random guest addressing exceptions. Fix this by doing the switch in sie_loop and sie_exit and saving the address space in the gmap structure itself. Also use the preempt notifier. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Acked-by: Avi Kivity <avi@redhat.com> Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/pgtable.c')
-rw-r--r--arch/s390/mm/pgtable.c10
1 files changed, 2 insertions, 8 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 4d1f2bc..f69ff3c 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -160,6 +160,8 @@ struct gmap *gmap_alloc(struct mm_struct *mm)
table = (unsigned long *) page_to_phys(page);
crst_table_init(table, _REGION1_ENTRY_EMPTY);
gmap->table = table;
+ gmap->asce = _ASCE_TYPE_REGION1 | _ASCE_TABLE_LENGTH |
+ _ASCE_USER_BITS | __pa(table);
list_add(&gmap->list, &mm->context.gmap_list);
return gmap;
@@ -240,10 +242,6 @@ EXPORT_SYMBOL_GPL(gmap_free);
*/
void gmap_enable(struct gmap *gmap)
{
- /* Load primary space page table origin. */
- S390_lowcore.user_asce = _ASCE_TYPE_REGION1 | _ASCE_TABLE_LENGTH |
- _ASCE_USER_BITS | __pa(gmap->table);
- asm volatile("lctlg 1,1,%0\n" : : "m" (S390_lowcore.user_asce) );
S390_lowcore.gmap = (unsigned long) gmap;
}
EXPORT_SYMBOL_GPL(gmap_enable);
@@ -254,10 +252,6 @@ EXPORT_SYMBOL_GPL(gmap_enable);
*/
void gmap_disable(struct gmap *gmap)
{
- /* Load primary space page table origin. */
- S390_lowcore.user_asce =
- gmap->mm->context.asce_bits | __pa(gmap->mm->pgd);
- asm volatile("lctlg 1,1,%0\n" : : "m" (S390_lowcore.user_asce) );
S390_lowcore.gmap = 0UL;
}
EXPORT_SYMBOL_GPL(gmap_disable);