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KVM: s390/mm: use radix trees for guest to host mappings

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Store the target address for the gmap segments in a radix tree
instead of using invalid segment table entries. gmap_translate
becomes a simple radix_tree_lookup, gmap_fault is split into the
address translation with gmap_translate and the part that does
the linking of the gmap shadow page table with the process page
table.
A second radix tree is used to keep the pointers to the segment
table entries for segments that are mapped in the guest address
space. On unmap of a segment the pointer is retrieved from the
radix tree and is used to carry out the segment invalidation in
the gmap shadow page table. As the radix tree can only store one
pointer, each host segment may only be mapped to exactly one
guest location.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Martin Schwidefsky
2014-04-30 16:04:25 +02:00
committed by Christian Borntraeger
parent 6e0a0431bf
commit 527e30b41d
7 changed files with 309 additions and 384 deletions
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arch/s390/mm/fault.c
+18 -7
View File
@@ -442,18 +442,15 @@ static inline int do_exception(struct pt_regs *regs, int access)
down_read(&mm->mmap_sem);
#ifdef CONFIG_PGSTE
gmap = (struct gmap *)
((current->flags & PF_VCPU) ? S390_lowcore.gmap : 0);
gmap = (current->flags & PF_VCPU) ?
(struct gmap *) S390_lowcore.gmap : NULL;
if (gmap) {
address = __gmap_fault(gmap, address);
current->thread.gmap_addr = address;
address = __gmap_translate(gmap, address);
if (address == -EFAULT) {
fault = VM_FAULT_BADMAP;
goto out_up;
}
if (address == -ENOMEM) {
fault = VM_FAULT_OOM;
goto out_up;
}
if (gmap->pfault_enabled)
flags |= FAULT_FLAG_RETRY_NOWAIT;
}
@@ -530,6 +527,20 @@ retry:
goto retry;
}
}
#ifdef CONFIG_PGSTE
if (gmap) {
address = __gmap_link(gmap, current->thread.gmap_addr,
address);
if (address == -EFAULT) {
fault = VM_FAULT_BADMAP;
goto out_up;
}
if (address == -ENOMEM) {
fault = VM_FAULT_OOM;
goto out_up;
}
}
#endif
fault = 0;
out_up:
up_read(&mm->mmap_sem);
arch/s390/mm/pgtable.c
+271 -352
View File
File diff suppressed because it is too large Load Diff
arch/s390/mm/vmem.c
+1 -1
View File
@@ -65,7 +65,7 @@ static pte_t __ref *vmem_pte_alloc(unsigned long address)
pte_t *pte;
if (slab_is_available())
pte = (pte_t *) page_table_alloc(&init_mm, address);
pte = (pte_t *) page_table_alloc(&init_mm);
else
pte = alloc_bootmem_align(PTRS_PER_PTE * sizeof(pte_t),
PTRS_PER_PTE * sizeof(pte_t));