diff options
Diffstat (limited to 'arch/s390/mm/gmap.c')
| -rw-r--r-- | arch/s390/mm/gmap.c | 29 |
1 files changed, 25 insertions, 4 deletions
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index f0b2a531c599..de7ad7bd4a48 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -20,6 +20,8 @@ #include <asm/gmap.h> #include <asm/tlb.h> +#define GMAP_SHADOW_FAKE_TABLE 1ULL + /** * gmap_alloc - allocate and initialize a guest address space * @mm: pointer to the parent mm_struct @@ -1521,6 +1523,8 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t) /* mark as invalid as long as the parent table is not protected */ *table = (unsigned long) s_r2t | _REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R1 | _REGION_ENTRY_INVALID; + if (sg->edat_level >= 1) + *table |= (r2t & _REGION_ENTRY_PROTECT); list_add(&page->lru, &sg->crst_list); spin_unlock(&sg->guest_table_lock); /* Make r2t read-only in parent gmap page table */ @@ -1592,6 +1596,8 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t) /* mark as invalid as long as the parent table is not protected */ *table = (unsigned long) s_r3t | _REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R2 | _REGION_ENTRY_INVALID; + if (sg->edat_level >= 1) + *table |= (r3t & _REGION_ENTRY_PROTECT); list_add(&page->lru, &sg->crst_list); spin_unlock(&sg->guest_table_lock); /* Make r3t read-only in parent gmap page table */ @@ -1664,6 +1670,8 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt) /* mark as invalid as long as the parent table is not protected */ *table = (unsigned long) s_sgt | _REGION_ENTRY_LENGTH | _REGION_ENTRY_TYPE_R3 | _REGION_ENTRY_INVALID; + if (sg->edat_level >= 1) + *table |= sgt & _REGION_ENTRY_PROTECT; list_add(&page->lru, &sg->crst_list); spin_unlock(&sg->guest_table_lock); /* Make sgt read-only in parent gmap page table */ @@ -1698,6 +1706,7 @@ EXPORT_SYMBOL_GPL(gmap_shadow_sgt); * @saddr: the address in the shadow aguest address space * @pgt: parent gmap address of the page table to get shadowed * @dat_protection: if the pgtable is marked as protected by dat + * @fake: pgt references contiguous guest memory block, not a pgtable * * Returns 0 if the shadow page table was found and -EAGAIN if the page * table was not found. @@ -1705,7 +1714,8 @@ EXPORT_SYMBOL_GPL(gmap_shadow_sgt); * Called with sg->mm->mmap_sem in read. */ int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr, - unsigned long *pgt, int *dat_protection) + unsigned long *pgt, int *dat_protection, + int *fake) { unsigned long *table; struct page *page; @@ -1717,8 +1727,9 @@ int gmap_shadow_pgt_lookup(struct gmap *sg, unsigned long saddr, if (table && !(*table & _SEGMENT_ENTRY_INVALID)) { /* Shadow page tables are full pages (pte+pgste) */ page = pfn_to_page(*table >> PAGE_SHIFT); - *pgt = page->index; + *pgt = page->index & ~GMAP_SHADOW_FAKE_TABLE; *dat_protection = !!(*table & _SEGMENT_ENTRY_PROTECT); + *fake = !!(page->index & GMAP_SHADOW_FAKE_TABLE); rc = 0; } else { rc = -EAGAIN; @@ -1734,6 +1745,7 @@ EXPORT_SYMBOL_GPL(gmap_shadow_pgt_lookup); * @sg: pointer to the shadow guest address space structure * @saddr: faulting address in the shadow gmap * @pgt: parent gmap address of the page table to get shadowed + * @fake: pgt references contiguous guest memory block, not a pgtable * * Returns 0 if successfully shadowed or already shadowed, -EAGAIN if the * shadow table structure is incomplete, -ENOMEM if out of memory, @@ -1741,19 +1753,22 @@ EXPORT_SYMBOL_GPL(gmap_shadow_pgt_lookup); * * Called with gmap->mm->mmap_sem in read */ -int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt) +int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt, + int fake) { unsigned long raddr, origin; unsigned long *s_pgt, *table; struct page *page; int rc; - BUG_ON(!gmap_is_shadow(sg)); + BUG_ON(!gmap_is_shadow(sg) || (pgt & _SEGMENT_ENTRY_LARGE)); /* Allocate a shadow page table */ page = page_table_alloc_pgste(sg->mm); if (!page) return -ENOMEM; page->index = pgt & _SEGMENT_ENTRY_ORIGIN; + if (fake) + page->index |= GMAP_SHADOW_FAKE_TABLE; s_pgt = (unsigned long *) page_to_phys(page); /* Install shadow page table */ spin_lock(&sg->guest_table_lock); @@ -1773,6 +1788,12 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt) *table = (unsigned long) s_pgt | _SEGMENT_ENTRY | (pgt & _SEGMENT_ENTRY_PROTECT) | _SEGMENT_ENTRY_INVALID; list_add(&page->lru, &sg->pt_list); + if (fake) { + /* nothing to protect for fake tables */ + *table &= ~_SEGMENT_ENTRY_INVALID; + spin_unlock(&sg->guest_table_lock); + return 0; + } spin_unlock(&sg->guest_table_lock); /* Make pgt read-only in parent gmap page table (not the pgste) */ raddr = (saddr & 0xfffffffffff00000UL) | _SHADOW_RMAP_SEGMENT; |