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KVM: introduce wrapper functions for creating/destroying dirty bitmaps 

This makes it easy to change the way of allocating/freeing dirty bitmaps.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Fernando Luis Vazquez Cao <fernando@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Takuya Yoshikawa 2010-10-27 18:22:19 +09:00 committed by Avi Kivity
parent 64be500706
commit a36a57b1a1
1 changed files with 23 additions and 7 deletions
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30
virt/kvm/kvm_main.c
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@ -444,6 +444,15 @@ out_err_nodisable:
return ERR_PTR(r);
}
static void kvm_destroy_dirty_bitmap(struct kvm_memory_slot *memslot)
{
if (!memslot->dirty_bitmap)
return;
vfree(memslot->dirty_bitmap);
memslot->dirty_bitmap = NULL;
}
/*
* Free any memory in @free but not in @dont.
*/
@ -456,7 +465,7 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
vfree(free->rmap);
if (!dont || free->dirty_bitmap != dont->dirty_bitmap)
vfree(free->dirty_bitmap);
kvm_destroy_dirty_bitmap(free);
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
@ -467,7 +476,6 @@ static void kvm_free_physmem_slot(struct kvm_memory_slot *free,
}
free->npages = 0;
free->dirty_bitmap = NULL;
free->rmap = NULL;
}
@ -529,6 +537,18 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
return 0;
}
static int kvm_create_dirty_bitmap(struct kvm_memory_slot *memslot)
{
unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(memslot);
memslot->dirty_bitmap = vmalloc(dirty_bytes);
if (!memslot->dirty_bitmap)
return -ENOMEM;
memset(memslot->dirty_bitmap, 0, dirty_bytes);
return 0;
}
/*
* Allocate some memory and give it an address in the guest physical address
* space.
@ -663,12 +683,8 @@ skip_lpage:
/* Allocate page dirty bitmap if needed */
if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
unsigned long dirty_bytes = kvm_dirty_bitmap_bytes(&new);
new.dirty_bitmap = vmalloc(dirty_bytes);
if (!new.dirty_bitmap)
if (kvm_create_dirty_bitmap(&new) < 0)
goto out_free;
memset(new.dirty_bitmap, 0, dirty_bytes);
/* destroy any largepage mappings for dirty tracking */
if (old.npages)
flush_shadow = 1;