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| author |   David Hildenbrand <dahi@linux.vnet.ibm.com> | 2015-03-11 16:47:33 +0100 |
|---|---|---|
| committer |   Christian Borntraeger <borntraeger@de.ibm.com> | 2016-06-20 09:55:24 +0200 |
| commit | 37d9df98b71afdf3baf41ee5451b6206c13328c6 (patch) | |
| tree | 9eac97b278ade808aef637721d417a03a5285bc1 /arch/s390/mm/gmap.c | |
| parent | KVM: s390: fast path for shadow gmaps in gmap notifier (diff) | |
| download | wireguard-linux-37d9df98b71afdf3baf41ee5451b6206c13328c6.tar.xz wireguard-linux-37d9df98b71afdf3baf41ee5451b6206c13328c6.zip | |
KVM: s390: backup the currently enabled gmap when scheduled out
Nested virtualization will have to enable own gmaps. Current code
would enable the wrong gmap whenever scheduled out and back in,
therefore resulting in the wrong gmap being enabled.
This patch reenables the last enabled gmap, therefore avoiding having to
touch vcpu->arch.gmap when enabling a different gmap.
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/gmap.c')
| -rw-r--r-- | arch/s390/mm/gmap.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 738d75495e56..af0ae6d7ac59 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -270,6 +270,17 @@ void gmap_disable(struct gmap *gmap) } EXPORT_SYMBOL_GPL(gmap_disable); +/** + * gmap_get_enabled - get a pointer to the currently enabled gmap + * + * Returns a pointer to the currently enabled gmap. 0 if none is enabled. + */ +struct gmap *gmap_get_enabled(void) +{ + return (struct gmap *) S390_lowcore.gmap; +} +EXPORT_SYMBOL_GPL(gmap_get_enabled); + /* * gmap_alloc_table is assumed to be called with mmap_sem held */ |