A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 11:11:45 -04:00
Code Issues Projects Releases Packages Wiki Activity

KVM: Write protect the updated slot only when dirty logging is enabled

Browse source 
Calling kvm_mmu_slot_remove_write_access() for a deleted slot does
nothing but search for non-existent mmu pages which have mappings to
that deleted memory; this is safe but a waste of time.

Since we want to make the function rmap based in a later patch, in a
manner which makes it unsafe to be called for a deleted slot, we makes
the caller see if the slot is non-zero and being dirty logged.

Reviewed-by: Marcelo Tosatti <[email protected]>
Signed-off-by: Takuya Yoshikawa <[email protected]>
Signed-off-by: Gleb Natapov <[email protected]>
This commit is contained in:
Takuya Yoshikawa 2013-01-08 19:43:28 +09:00 • committed by Gleb Natapov
commit c972f3b125
2 changed files with 7 additions and 2 deletions
Download patch file Download diff file Expand all files Collapse all files

1
virt/kvm/kvm_main.c
View file

@ -817,7 +817,6 @@ int __kvm_set_memory_region(struct kvm *kvm,
if ((new.flags & KVM_MEM_LOG_DIRTY_PAGES) && !new.dirty_bitmap) {
if (kvm_create_dirty_bitmap(&new) < 0)
goto out_free;
/* destroy any largepage mappings for dirty tracking */
}
if (!npages || base_gfn != old.base_gfn) {