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| author | Gleb Natapov <gleb@redhat.com> | 2013-05-31 00:36:30 (GMT) |
|---|---|---|
| committer | Gleb Natapov <gleb@redhat.com> | 2013-06-05 09:34:02 (GMT) |
| commit | 05988d728dcd962d50374e4e63171324163005b6 (patch) | |
| tree | d9839cdbd1514e367d5d6e073d8b80c25f87fc0c /arch/x86/kvm | |
| parent | 365c886860c4ba670d245e762b23987c912c129a (diff) | |
| download | linux-05988d728dcd962d50374e4e63171324163005b6.tar.xz | |
KVM: MMU: reduce KVM_REQ_MMU_RELOAD when root page is zapped
Quote Gleb's mail:
| why don't we check for sp->role.invalid in
| kvm_mmu_prepare_zap_page before calling kvm_reload_remote_mmus()?
and
| Actually we can add check for is_obsolete_sp() there too since
| kvm_mmu_invalidate_all_pages() already calls kvm_reload_remote_mmus()
| after incrementing mmu_valid_gen.
[ Xiao: add some comments and the check of is_obsolete_sp() ]
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@linux.vnet.ibm.com>
Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Diffstat (limited to 'arch/x86/kvm')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 79af88a..6941fa7 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2108,7 +2108,13 @@ static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp, kvm_mod_used_mmu_pages(kvm, -1); } else { list_move(&sp->link, &kvm->arch.active_mmu_pages); - kvm_reload_remote_mmus(kvm); + + /* + * The obsolete pages can not be used on any vcpus. + * See the comments in kvm_mmu_invalidate_zap_all_pages(). + */ + if (!sp->role.invalid && !is_obsolete_sp(kvm, sp)) + kvm_reload_remote_mmus(kvm); } sp->role.invalid = 1; |