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KVM: MMU: Don't flush shadow when enabling dirty tracking

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Instead, drop large mappings, which were the reason we dropped shadow.

Signed-off-by: Avi Kivity <[email protected]>
Signed-off-by: Marcelo Tosatti <[email protected]>
This commit is contained in:
Avi Kivity 2010-12-27 12:08:45 +02:00 • committed by Marcelo Tosatti
commit 8234b22e1c
2 changed files with 9 additions and 10 deletions
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7
virt/kvm/kvm_main.c
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@ -621,7 +621,7 @@ int __kvm_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
int user_alloc)
{
int r, flush_shadow = 0;
int r;
gfn_t base_gfn;
unsigned long npages;
unsigned long i;
@ -741,8 +741,6 @@ skip_lpage:
if (kvm_create_dirty_bitmap(&new) < 0)
goto out_free;
/* destroy any largepage mappings for dirty tracking */
if (old.npages)
flush_shadow = 1;
}
#else /* not defined CONFIG_S390 */
new.user_alloc = user_alloc;
@ -813,9 +811,6 @@ skip_lpage:
kvm_free_physmem_slot(&old, &new);
kfree(old_memslots);
if (flush_shadow)
kvm_arch_flush_shadow(kvm);
return 0;
out_free: