Let's try this
Signed-off-by: Janosch Frank <frankja@xxxxxxxxxxxxxxxxxx>
---
arch/s390/include/asm/gmap.h | 5 ++-
arch/s390/mm/gmap.c | 72 ++++++++------------------------------------
2 files changed, 14 insertions(+), 63 deletions(-)
diff --git a/arch/s390/include/asm/gmap.h b/arch/s390/include/asm/gmap.h
index 6287aca..4120360 100644
--- a/arch/s390/include/asm/gmap.h
+++ b/arch/s390/include/asm/gmap.h
@@ -13,9 +13,8 @@
#define GMAP_NOTIFY_SHADOW 0x2
#define GMAP_NOTIFY_MPROT 0x1
-/* Status bits in huge and non-huge gmap segment entries. */
-#define _SEGMENT_ENTRY_GMAP_IN 0x0001 /* invalidation notify bit */
-#define _SEGMENT_ENTRY_GMAP_SPLIT 0x0002 /* split huge pmd */
+/* Status bit in huge and non-huge gmap segment entries. */
+#define _SEGMENT_ENTRY_GMAP_SPLIT 0x0001 /* split huge pmd */
/* Status bits only for huge segment entries */
#define _SEGMENT_ENTRY_GMAP_UC 0x4000 /* user dirty (migration) */
#define _SEGMENT_ENTRY_GMAP_VSIE 0x8000 /* vsie bit */
diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c
index 10e0690..c47964f 100644
--- a/arch/s390/mm/gmap.c
+++ b/arch/s390/mm/gmap.c
@@ -998,7 +998,7 @@ static void gmap_pte_transfer_prot(struct mm_struct *mm, unsigned long addr,
* and requested access rights are incompatible.
*/
static int gmap_pmdp_force_prot(struct gmap *gmap, unsigned long addr,
- pmd_t *pmdp, int prot, unsigned long bits)
+ pmd_t *pmdp, int prot)
{
int pmd_i = pmd_val(*pmdp) & _SEGMENT_ENTRY_INVALID;
int pmd_p = pmd_val(*pmdp) & _SEGMENT_ENTRY_PROTECT;
@@ -1018,7 +1018,6 @@ static int gmap_pmdp_force_prot(struct gmap *gmap, unsigned long addr,
pmd_val(new) |= _SEGMENT_ENTRY_PROTECT;
gmap_pmdp_xchg(gmap, pmdp, new, addr);
}
- pmd_val(*pmdp) |= bits;
return 0;
}
@@ -1136,21 +1135,18 @@ static int gmap_protect_pmd(struct gmap *gmap, unsigned long gaddr,
unsigned long vmaddr, pmd_t *pmdp, pmd_t *hpmdp,
int prot, unsigned long bits)
{
- unsigned long sbits = 0;
int ret = 0;
- sbits |= (bits & GMAP_NOTIFY_MPROT) ? _SEGMENT_ENTRY_GMAP_IN : 0;
- sbits |= (bits & GMAP_NOTIFY_SHADOW) ? _SEGMENT_ENTRY_GMAP_VSIE : 0;
-
- if (((prot != PROT_WRITE) && (bits & GMAP_NOTIFY_SHADOW))) {
+ /* We notify only on the smallest possible frame size, a 4k page. */
+ if (bits) {
ret = gmap_pmd_split(gmap, gaddr, pmdp);
if (ret)
return ret;
return -EFAULT;
}
- /* Protect gmap pmd */
- ret = gmap_pmdp_force_prot(gmap, gaddr, pmdp, prot, sbits);
+ /* Protect gmap pmd for dirty tracking. */
+ ret = gmap_pmdp_force_prot(gmap, gaddr, pmdp, prot);
/*
* Transfer protection back to the host pmd, so userspace has
* never more access rights than the VM.
@@ -1167,7 +1163,7 @@ static int gmap_protect_pmd(struct gmap *gmap, unsigned long gaddr,
* @gaddr: virtual address in the guest address space
* @len: size of area
* @prot: indicates access rights: PROT_NONE, PROT_READ or PROT_WRITE
- * @bits: pgste notification bits to set
+ * @bits: notification bits to set
*
* Returns 0 if successfully protected, -ENOMEM if out of memory and
* -EFAULT if gaddr is invalid (or mapping for shadows is missing).
@@ -1196,11 +1192,6 @@ static int gmap_protect_range(struct gmap *gmap, unsigned long gaddr,
pmdp = gmap_pmd_op_walk(gmap, gaddr);
if (pmdp) {
if (!pmd_large(*pmdp)) {
- if (gmap_pmd_is_split(pmdp) &&
- (bits & GMAP_NOTIFY_MPROT)) {
- pmd_val(*pmdp) |= _SEGMENT_ENTRY_GMAP_IN;
- }
-
rc = gmap_protect_pte(gmap, gaddr, vmaddr,
pmdp, hpmdp, prot, bits);
if (!rc) {
@@ -2562,53 +2553,20 @@ static void gmap_shadow_notify_pmd(struct gmap *sg, unsigned long vmaddr,
unsigned long gaddr)
{
struct gmap_rmap *rmap, *rnext, *head;
- unsigned long start, end, bits, raddr;
+ unsigned long bits, raddr;
BUG_ON(!gmap_is_shadow(sg));
spin_lock_nested(&sg->guest_table_lock, GMAP_LOCK_SHADOW);
- if (sg->removed) {
- spin_unlock(&sg->guest_table_lock);
- return;
- }
- /* Check for top level table */
- start = sg->orig_asce & _ASCE_ORIGIN;
- end = start + ((sg->orig_asce & _ASCE_TABLE_LENGTH) + 1) * 4096;
- if (!(sg->orig_asce & _ASCE_REAL_SPACE) && gaddr >= start &&
- gaddr < ((end & HPAGE_MASK) + HPAGE_SIZE - 1)) {
- /* The complete shadow table has to go */
- gmap_unshadow(sg);
- spin_unlock(&sg->guest_table_lock);
- list_del(&sg->list);
- gmap_put(sg);
- return;
- }
- /* Remove the page table tree from on specific entry */
head = radix_tree_delete(&sg->host_to_rmap, (vmaddr & HPAGE_MASK) >> PAGE_SHIFT);
gmap_for_each_rmap_safe(rmap, rnext, head) {
bits = rmap->raddr & _SHADOW_RMAP_MASK;
raddr = rmap->raddr ^ bits;
- switch (bits) {
- case _SHADOW_RMAP_REGION1:
- gmap_unshadow_r2t(sg, raddr);
- break;
- case _SHADOW_RMAP_REGION2:
- gmap_unshadow_r3t(sg, raddr);
- break;
- case _SHADOW_RMAP_REGION3:
- gmap_unshadow_sgt(sg, raddr);
- break;
- case _SHADOW_RMAP_SEGMENT_LP:
+ if (bits == _SHADOW_RMAP_SEGMENT_LP)
gmap_unshadow_segment(sg, raddr);
- break;
- case _SHADOW_RMAP_SEGMENT:
- gmap_unshadow_pgt(sg, raddr);
- break;
- case _SHADOW_RMAP_PGTABLE:
- gmap_unshadow_page(sg, raddr);
- break;
- }
+ else
+ BUG_ON(1);
kfree(rmap);
}
spin_unlock(&sg->guest_table_lock);
@@ -2777,9 +2735,8 @@ static void pmdp_notify_gmap(struct gmap *gmap, unsigned long gaddr)
table = gmap_table_walk(gmap, gaddr, 1);
if (!table)
return;
- bits = *table & _SEGMENT_ENTRY_GMAP_IN;
if (pmd_large(__pmd(*table)) && (*table & _SEGMENT_ENTRY_GMAP_VSIE))
- bits |= _SEGMENT_ENTRY_GMAP_VSIE;
+ bits = _SEGMENT_ENTRY_GMAP_VSIE;
if (!bits)
return;
*table &= ~bits;
@@ -2792,8 +2749,6 @@ static void pmdp_notify_gmap(struct gmap *gmap, unsigned long gaddr)
gmap_shadow_notify_pmd(sg, vmaddr, gaddr);
spin_unlock(&gmap->shadow_lock);
}
- if (bits & _SEGMENT_ENTRY_GMAP_IN)
- gmap_call_notifier(gmap, gaddr, gaddr + HPAGE_SIZE - 1);
}
static void pmdp_notify_split(struct mm_struct *mm, unsigned long vmaddr,
@@ -2841,9 +2796,8 @@ void pmdp_notify(struct mm_struct *mm, unsigned long vmaddr)
continue;
}
- bits = *table & (_SEGMENT_ENTRY_GMAP_IN);
if (pmd_large(__pmd(*table)) && (*table & _SEGMENT_ENTRY_GMAP_VSIE))
- bits |= _SEGMENT_ENTRY_GMAP_VSIE;
+ bits = _SEGMENT_ENTRY_GMAP_VSIE;
*table &= ~bits;
gaddr = __gmap_segment_gaddr(table);
spin_unlock(&gmap->guest_table_lock);
@@ -2854,8 +2808,6 @@ void pmdp_notify(struct mm_struct *mm, unsigned long vmaddr)
gmap_shadow_notify_pmd(sg, vmaddr, gaddr);
spin_unlock(&gmap->shadow_lock);
}
- if (bits & _SEGMENT_ENTRY_GMAP_IN)
- gmap_call_notifier(gmap, gaddr, gaddr + HPAGE_SIZE - 1);
}
rcu_read_unlock();
}
--
2.7.4
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