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| author | Paolo Bonzini <pbonzini@redhat.com> | 2018-10-04 17:12:45 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2018-10-04 17:12:45 +0200 |
| commit | dd5bd0a65ff6f22a32b35ca3fa1bcf7a6bc7104f (patch) | |
| tree | 7214fc9fb55a1cedee4d0bca3a4f6799414236e7 /arch/s390/mm/gmap.c | |
| parent | 7e7126846c95a34f98a1524d5c473af1f0783735 (diff) | |
| parent | 55d09dd4c86060fbbc74ab2b1bfaed401cd0163a (diff) | |
Merge tag 'kvm-s390-next-4.20-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD
KVM: s390: Features for 4.20
- Initial version of AP crypto virtualization via vfio-mdev
- Set the host program identifier
- Optimize page table locking
Diffstat (limited to 'arch/s390/mm/gmap.c')
| -rw-r--r-- | arch/s390/mm/gmap.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index 911c7ded35f1..1e668b95e0c6 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -907,10 +907,16 @@ static inline pmd_t *gmap_pmd_op_walk(struct gmap *gmap, unsigned long gaddr) pmd_t *pmdp; BUG_ON(gmap_is_shadow(gmap)); - spin_lock(&gmap->guest_table_lock); pmdp = (pmd_t *) gmap_table_walk(gmap, gaddr, 1); + if (!pmdp) + return NULL; - if (!pmdp || pmd_none(*pmdp)) { + /* without huge pages, there is no need to take the table lock */ + if (!gmap->mm->context.allow_gmap_hpage_1m) + return pmd_none(*pmdp) ? NULL : pmdp; + + spin_lock(&gmap->guest_table_lock); + if (pmd_none(*pmdp)) { spin_unlock(&gmap->guest_table_lock); return NULL; } |