On Wed, Mar 20, 2013 at 04:30:24PM +0800, Xiao Guangrong wrote:
> Move deletion shadow page from the hash list from kvm_mmu_commit_zap_page to
> kvm_mmu_prepare_zap_page, we that we can free the shadow page out of mmu-lock.
>
> Also, delete the invalid shadow page from the hash list since this page can
> not be reused anymore. This makes reset mmu-cache more easier - we do not need
> to care all hash entries after reset mmu-cache
>
> Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx>
> ---
> arch/x86/kvm/mmu.c | 8 ++++++--
> 1 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
> index dc37512..5578c91 100644
> --- a/arch/x86/kvm/mmu.c
> +++ b/arch/x86/kvm/mmu.c
> @@ -1472,7 +1472,7 @@ static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr)
> static void kvm_mmu_free_page(struct kvm_mmu_page *sp)
> {
> ASSERT(is_empty_shadow_page(sp->spt));
> - hlist_del(&sp->hash_link);
> +
> list_del(&sp->link);
> free_page((unsigned long)sp->spt);
> if (!sp->role.direct)
> @@ -1660,7 +1660,8 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm,
>
> #define for_each_gfn_indirect_valid_sp(_kvm, _sp, _gfn) \
> for_each_gfn_sp(_kvm, _sp, _gfn) \
> - if ((_sp)->role.direct || (_sp)->role.invalid) {} else
> + if ((_sp)->role.direct || \
> + ((_sp)->role.invalid && WARN_ON(1))) {} else
>
> /* @sp->gfn should be write-protected at the call site */
> static int __kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
> @@ -2079,6 +2080,9 @@ static int kvm_mmu_prepare_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp,
> unaccount_shadowed(kvm, sp->gfn);
> if (sp->unsync)
> kvm_unlink_unsync_page(kvm, sp);
> +
> + hlist_del_init(&sp->hash_link);
> +
Now we delete roots from hash, but leave it on active_mmu_pages list. Is
this OK?
> if (!sp->root_count) {
> /* Count self */
> ret++;
> --
> 1.7.7.6
--
Gleb.
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