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| author | Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> | 2012-03-01 19:32:16 +0900 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-04-08 12:49:58 +0300 |
| commit | 5dc99b2380d59b8aeafa98791f92b96400ed3187 (patch) | |
| tree | eba3731e113e14df9bd2e1ece5a3493dd5e606c0 /arch/x86/kvm/x86.c | |
| parent | a0ed46073c14f66dbf0707aaa7588b78da83d7c6 (diff) | |
| download | op-kernel-dev-5dc99b2380d59b8aeafa98791f92b96400ed3187.zip op-kernel-dev-5dc99b2380d59b8aeafa98791f92b96400ed3187.tar.gz | |
KVM: Avoid checking huge page mappings in get_dirty_log()
Dropped such mappings when we enabled dirty logging and we will never
create new ones until we stop the logging.
For this we introduce a new function which can be used to write protect
a range of PT level pages: although we do not need to care about a range
of pages at this point, the following patch will need this feature to
optimize the write protection of many pages.
Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 8 |
1 files changed, 3 insertions, 5 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 99b7380..813ebf1 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -3095,13 +3095,11 @@ static void write_protect_slot(struct kvm *kvm, /* Not many dirty pages compared to # of shadow pages. */ if (nr_dirty_pages < kvm->arch.n_used_mmu_pages) { - unsigned long gfn_offset; + gfn_t offset; - for_each_set_bit(gfn_offset, dirty_bitmap, memslot->npages) { - unsigned long gfn = memslot->base_gfn + gfn_offset; + for_each_set_bit(offset, dirty_bitmap, memslot->npages) + kvm_mmu_write_protect_pt_masked(kvm, memslot, offset, 1); - kvm_mmu_rmap_write_protect(kvm, gfn, memslot); - } kvm_flush_remote_tlbs(kvm); } else kvm_mmu_slot_remove_write_access(kvm, memslot->id); |
