diff options
Diffstat (limited to 'arch/s390/kvm/gaccess.c')
| -rw-r--r-- | arch/s390/kvm/gaccess.c | 32 |
1 files changed, 15 insertions, 17 deletions
diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index c5f79c1205cf..5b5eee2d51cd 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -1091,26 +1091,24 @@ int kvm_s390_shadow_fault(struct gmap *sg, unsigned long saddr, int write) int dat_protection; int rc; + down_read(&sg->mm->mmap_sem); + rc = gmap_shadow_pgt_lookup(sg, saddr, &pgt, &dat_protection); - if (rc) { + if (rc) rc = kvm_s390_shadow_tables(sg, saddr, &pgt, &dat_protection); - if (rc) - return rc; - } vaddr.addr = saddr; - rc = gmap_read_table(sg->parent, pgt + vaddr.px * 8, &pte.val); - if (rc) - return rc; - if (pte.i) - return PGM_PAGE_TRANSLATION; - if (pte.z || pte.co) - return PGM_TRANSLATION_SPEC; + if (!rc) + rc = gmap_read_table(sg->parent, pgt + vaddr.px * 8, &pte.val); + if (!rc && pte.i) + rc = PGM_PAGE_TRANSLATION; + if (!rc && (pte.z || pte.co)) + rc = PGM_TRANSLATION_SPEC; dat_protection |= pte.p; - if (write && dat_protection) - return PGM_PROTECTION; - rc = gmap_shadow_page(sg, saddr, __pte(pte.val)); - if (rc) - return rc; - return 0; + if (!rc && write && dat_protection) + rc = PGM_PROTECTION; + if (!rc) + rc = gmap_shadow_page(sg, saddr, __pte(pte.val)); + up_read(&sg->mm->mmap_sem); + return rc; } |