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KVM: MMU: reduce KVM_REQ_MMU_RELOAD when root page is zapped

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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>
This commit is contained in:
Gleb Natapov 2013-05-31 08:36:30 +08:00
parent 365c886860
commit 05988d728d
1 changed files with 7 additions and 1 deletions
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8
arch/x86/kvm/mmu.c
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@ -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;