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Diffstat (limited to 'arch/s390/mm/gmap.c')
-rw-r--r--arch/s390/mm/gmap.c44
1 files changed, 18 insertions, 26 deletions
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index 05d459b638f5..2c55a2b9d6c6 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -815,27 +815,17 @@ static inline unsigned long *gmap_table_walk(struct gmap *gmap,
* @ptl: pointer to the spinlock pointer
*
* Returns a pointer to the locked pte for a guest address, or NULL
- *
- * Note: Can also be called for shadow gmaps.
*/
static pte_t *gmap_pte_op_walk(struct gmap *gmap, unsigned long gaddr,
spinlock_t **ptl)
{
unsigned long *table;
- if (gmap_is_shadow(gmap))
- spin_lock(&gmap->guest_table_lock);
+ BUG_ON(gmap_is_shadow(gmap));
/* Walk the gmap page table, lock and get pte pointer */
table = gmap_table_walk(gmap, gaddr, 1); /* get segment pointer */
- if (!table || *table & _SEGMENT_ENTRY_INVALID) {
- if (gmap_is_shadow(gmap))
- spin_unlock(&gmap->guest_table_lock);
+ if (!table || *table & _SEGMENT_ENTRY_INVALID)
return NULL;
- }
- if (gmap_is_shadow(gmap)) {
- *ptl = &gmap->guest_table_lock;
- return pte_offset_map((pmd_t *) table, gaddr);
- }
return pte_alloc_map_lock(gmap->mm, (pmd_t *) table, gaddr, ptl);
}
@@ -889,8 +879,6 @@ static void gmap_pte_op_end(spinlock_t *ptl)
* -EFAULT if gaddr is invalid (or mapping for shadows is missing).
*
* Called with sg->mm->mmap_sem in read.
- *
- * Note: Can also be called for shadow gmaps.
*/
static int gmap_protect_range(struct gmap *gmap, unsigned long gaddr,
unsigned long len, int prot, unsigned long bits)
@@ -900,6 +888,7 @@ static int gmap_protect_range(struct gmap *gmap, unsigned long gaddr,
pte_t *ptep;
int rc;
+ BUG_ON(gmap_is_shadow(gmap));
while (len) {
rc = -EAGAIN;
ptep = gmap_pte_op_walk(gmap, gaddr, &ptl);
@@ -960,7 +949,8 @@ EXPORT_SYMBOL_GPL(gmap_mprotect_notify);
* @val: pointer to the unsigned long value to return
*
* Returns 0 if the value was read, -ENOMEM if out of memory and -EFAULT
- * if reading using the virtual address failed.
+ * if reading using the virtual address failed. -EINVAL if called on a gmap
+ * shadow.
*
* Called with gmap->mm->mmap_sem in read.
*/
@@ -971,6 +961,9 @@ int gmap_read_table(struct gmap *gmap, unsigned long gaddr, unsigned long *val)
pte_t *ptep, pte;
int rc;
+ if (gmap_is_shadow(gmap))
+ return -EINVAL;
+
while (1) {
rc = -EAGAIN;
ptep = gmap_pte_op_walk(gmap, gaddr, &ptl);
@@ -1028,18 +1021,17 @@ static inline void gmap_insert_rmap(struct gmap *sg, unsigned long vmaddr,
}
/**
- * gmap_protect_rmap - modify access rights to memory and create an rmap
+ * gmap_protect_rmap - restrict access rights to memory (RO) and create an rmap
* @sg: pointer to the shadow guest address space structure
* @raddr: rmap address in the shadow gmap
* @paddr: address in the parent guest address space
* @len: length of the memory area to protect
- * @prot: indicates access rights: none, read-only or read-write
*
* Returns 0 if successfully protected and the rmap was created, -ENOMEM
* if out of memory and -EFAULT if paddr is invalid.
*/
static int gmap_protect_rmap(struct gmap *sg, unsigned long raddr,
- unsigned long paddr, unsigned long len, int prot)
+ unsigned long paddr, unsigned long len)
{
struct gmap *parent;
struct gmap_rmap *rmap;
@@ -1067,7 +1059,7 @@ static int gmap_protect_rmap(struct gmap *sg, unsigned long raddr,
ptep = gmap_pte_op_walk(parent, paddr, &ptl);
if (ptep) {
spin_lock(&sg->guest_table_lock);
- rc = ptep_force_prot(parent->mm, paddr, ptep, prot,
+ rc = ptep_force_prot(parent->mm, paddr, ptep, PROT_READ,
PGSTE_VSIE_BIT);
if (!rc)
gmap_insert_rmap(sg, vmaddr, rmap);
@@ -1077,7 +1069,7 @@ static int gmap_protect_rmap(struct gmap *sg, unsigned long raddr,
radix_tree_preload_end();
if (rc) {
kfree(rmap);
- rc = gmap_pte_op_fixup(parent, paddr, vmaddr, prot);
+ rc = gmap_pte_op_fixup(parent, paddr, vmaddr, PROT_READ);
if (rc)
return rc;
continue;
@@ -1616,7 +1608,7 @@ int gmap_shadow_r2t(struct gmap *sg, unsigned long saddr, unsigned long r2t,
origin = r2t & _REGION_ENTRY_ORIGIN;
offset = ((r2t & _REGION_ENTRY_OFFSET) >> 6) * PAGE_SIZE;
len = ((r2t & _REGION_ENTRY_LENGTH) + 1) * PAGE_SIZE - offset;
- rc = gmap_protect_rmap(sg, raddr, origin + offset, len, PROT_READ);
+ rc = gmap_protect_rmap(sg, raddr, origin + offset, len);
spin_lock(&sg->guest_table_lock);
if (!rc) {
table = gmap_table_walk(sg, saddr, 4);
@@ -1699,7 +1691,7 @@ int gmap_shadow_r3t(struct gmap *sg, unsigned long saddr, unsigned long r3t,
origin = r3t & _REGION_ENTRY_ORIGIN;
offset = ((r3t & _REGION_ENTRY_OFFSET) >> 6) * PAGE_SIZE;
len = ((r3t & _REGION_ENTRY_LENGTH) + 1) * PAGE_SIZE - offset;
- rc = gmap_protect_rmap(sg, raddr, origin + offset, len, PROT_READ);
+ rc = gmap_protect_rmap(sg, raddr, origin + offset, len);
spin_lock(&sg->guest_table_lock);
if (!rc) {
table = gmap_table_walk(sg, saddr, 3);
@@ -1783,7 +1775,7 @@ int gmap_shadow_sgt(struct gmap *sg, unsigned long saddr, unsigned long sgt,
origin = sgt & _REGION_ENTRY_ORIGIN;
offset = ((sgt & _REGION_ENTRY_OFFSET) >> 6) * PAGE_SIZE;
len = ((sgt & _REGION_ENTRY_LENGTH) + 1) * PAGE_SIZE - offset;
- rc = gmap_protect_rmap(sg, raddr, origin + offset, len, PROT_READ);
+ rc = gmap_protect_rmap(sg, raddr, origin + offset, len);
spin_lock(&sg->guest_table_lock);
if (!rc) {
table = gmap_table_walk(sg, saddr, 2);
@@ -1902,7 +1894,7 @@ int gmap_shadow_pgt(struct gmap *sg, unsigned long saddr, unsigned long pgt,
/* Make pgt read-only in parent gmap page table (not the pgste) */
raddr = (saddr & _SEGMENT_MASK) | _SHADOW_RMAP_SEGMENT;
origin = pgt & _SEGMENT_ENTRY_ORIGIN & PAGE_MASK;
- rc = gmap_protect_rmap(sg, raddr, origin, PAGE_SIZE, PROT_READ);
+ rc = gmap_protect_rmap(sg, raddr, origin, PAGE_SIZE);
spin_lock(&sg->guest_table_lock);
if (!rc) {
table = gmap_table_walk(sg, saddr, 1);
@@ -2005,7 +1997,7 @@ EXPORT_SYMBOL_GPL(gmap_shadow_page);
* Called with sg->parent->shadow_lock.
*/
static void gmap_shadow_notify(struct gmap *sg, unsigned long vmaddr,
- unsigned long gaddr, pte_t *pte)
+ unsigned long gaddr)
{
struct gmap_rmap *rmap, *rnext, *head;
unsigned long start, end, bits, raddr;
@@ -2090,7 +2082,7 @@ void ptep_notify(struct mm_struct *mm, unsigned long vmaddr,
spin_lock(&gmap->shadow_lock);
list_for_each_entry_safe(sg, next,
&gmap->children, list)
- gmap_shadow_notify(sg, vmaddr, gaddr, pte);
+ gmap_shadow_notify(sg, vmaddr, gaddr);
spin_unlock(&gmap->shadow_lock);
}
if (bits & PGSTE_IN_BIT)
generated by cgit v1.2.3 (git 2.39.0) at 2025-02-05 10:03:48 +0300