diff options
| -rw-r--r-- | arch/s390/include/asm/gmap.h | 3 | ||||
| -rw-r--r-- | arch/s390/kvm/gaccess.c | 22 | ||||
| -rw-r--r-- | arch/s390/mm/gmap.c | 14 |
3 files changed, 34 insertions, 5 deletions
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h index c8ba5a1..2e4c3b2 100644 --- a/arch/s390/include/asm/gmap.h +++ b/arch/s390/include/asm/gmap.h @@ -111,7 +111,8 @@ struct gmap *gmap_shadow(struct gmap *parent, unsigned long asce, int edat_level); int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t); int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t); -int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt); +int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, + int fake); int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, int fake); int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr, diff --git a/arch/s390/kvm/gaccess.c b/arch/s390/kvm/gaccess.c index af1fc6f..fab03ec 100644 --- a/arch/s390/kvm/gaccess.c +++ b/arch/s390/kvm/gaccess.c @@ -1042,17 +1042,35 @@ static int kvm_s390_shadow_tables(struct gmap *sg, unsigned long saddr, return PGM_REGION_THIRD_TRANS; if (rtte.tt != TABLE_TYPE_REGION3) return PGM_TRANSLATION_SPEC; + if (rtte.cr && asce.p && sg->edat_level >= 2) + return PGM_TRANSLATION_SPEC; + if (rtte.fc && sg->edat_level >= 2) { + bool prot = rtte.fc1.p; + + *fake = 1; + ptr = rtte.fc1.rfaa << 31UL; + rtte.val = ptr; + rtte.fc0.p = prot; + goto shadow_sgt; + } if (vaddr.sx01 < rtte.fc0.tf || vaddr.sx01 > rtte.fc0.tl) return PGM_SEGMENT_TRANSLATION; - rc = gmap_shadow_sgt(sg, saddr, rtte.val); + ptr = rtte.fc0.sto << 12UL; +shadow_sgt: + rc = gmap_shadow_sgt(sg, saddr, rtte.val, *fake); if (rc) return rc; - ptr = rtte.fc0.sto * 4096; /* fallthrough */ } case ASCE_TYPE_SEGMENT: { union segment_table_entry ste; + if (*fake) { + /* offset in 2G guest memory block */ + ptr = ptr + ((unsigned long) vaddr.sx << 20UL); + ste.val = ptr; + goto shadow_pgt; + } rc = gmap_read_table(parent, ptr + vaddr.sx * 8, &ste.val); if (rc) return rc; diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index de7ad7b..c96bf30 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -1631,6 +1631,7 @@ EXPORT_SYMBOL_GPL(gmap_shadow_r3t); * @sg: pointer to the shadow guest address space structure * @saddr: faulting address in the shadow gmap * @sgt: parent gmap address of the segment table to get shadowed + * @fake: sgt references contiguous guest memory block, not a sgt * * Returns: 0 if successfully shadowed or already shadowed, -EAGAIN if the * shadow table structure is incomplete, -ENOMEM if out of memory and @@ -1638,19 +1639,22 @@ EXPORT_SYMBOL_GPL(gmap_shadow_r3t); * * Called with sg->mm->mmap_sem in read. */ -int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt) +int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt, + int fake) { unsigned long raddr, origin, offset, len; unsigned long *s_sgt, *table; struct page *page; int rc; - BUG_ON(!gmap_is_shadow(sg)); + BUG_ON(!gmap_is_shadow(sg) || (sgt & _REGION3_ENTRY_LARGE)); /* Allocate a shadow segment table */ page = alloc_pages(GFP_KERNEL, 2); if (!page) return -ENOMEM; page->index = sgt & _REGION_ENTRY_ORIGIN; + if (fake) + page->index |= GMAP_SHADOW_FAKE_TABLE; s_sgt = (unsigned long *) page_to_phys(page); /* Install shadow region second table */ spin_lock(&sg->guest_table_lock); @@ -1673,6 +1677,12 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt) if (sg->edat_level >= 1) *table |= sgt & _REGION_ENTRY_PROTECT; list_add(&page->lru, &sg->crst_list); + if (fake) { + /* nothing to protect for fake tables */ + *table &= ~_REGION_ENTRY_INVALID; + spin_unlock(&sg->guest_table_lock); + return 0; + } spin_unlock(&sg->guest_table_lock); /* Make sgt read-only in parent gmap page table */ raddr = (saddr & 0xffffffff80000000UL) | _SHADOW_RMAP_REGION3; |