xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

[S390] kvm: fix address mode switching

Browse Source 
598841ca99 ([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>
This commit is contained in:
Christian Borntraeger
2011-09-20 17:07:28 +02:00
committed by Heiko Carstens
parent 9d037a7776
commit 480e5926ce
5 changed files with 15 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

10
arch/s390/mm/pgtable.c
View File

@@ -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);