From: Takuya Yoshikawa <yoshikawa.tak...@oss.ntt.co.jp>
Use list_entry() instead of container_of() for taking a shadow page from
the active_mmu_pages list.
Note: the return value of pre_zap_one_sp() will be used later.
Signed-off-by: Takuya Yoshikawa <yoshikawa.tak...@oss.ntt.co.jp>
---
arch/x86/kvm/mmu.c | 45 +++++++++++++++++++++++----------------------
1 files changed, 23 insertions(+), 22 deletions(-)
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 590f76b..b1e8270 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1930,6 +1930,26 @@ static int kvm_mmu_prepare_zap_page(struct kvm *kvm,
struct kvm_mmu_page *sp,
return ret;
}
+/**
+ * pre_zap_one_sp - make one shadow page ready for being freed
+ * @kvm: the kvm instance
+ * @invalid_list: the list to which we add shadow pages ready for being freed
+ *
+ * Take one shadow page from the tail of the active_mmu_pages list and make it
+ * ready for being freed, then put it into the @invalid_list. Other pages,
+ * unsync children, may also be put into the @invalid_list.
+ *
+ * Return the number of shadow pages added to the @invalid_list this way.
+ */
+static int pre_zap_one_sp(struct kvm *kvm, struct list_head *invalid_list)
+{
+ struct kvm_mmu_page *sp;
+
+ sp = list_entry(kvm->arch.active_mmu_pages.prev,
+ struct kvm_mmu_page, link);
+ return kvm_mmu_prepare_zap_page(kvm, sp, invalid_list);
+}
+
static void kvm_mmu_isolate_pages(struct list_head *invalid_list)
{
struct kvm_mmu_page *sp;
@@ -1999,11 +2019,7 @@ void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned
int goal_nr_mmu_pages)
if (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages) {
while (kvm->arch.n_used_mmu_pages > goal_nr_mmu_pages &&
!list_empty(&kvm->arch.active_mmu_pages)) {
- struct kvm_mmu_page *page;
-
- page = container_of(kvm->arch.active_mmu_pages.prev,
- struct kvm_mmu_page, link);
- kvm_mmu_prepare_zap_page(kvm, page, &invalid_list);
+ pre_zap_one_sp(kvm, &invalid_list);
}
kvm_mmu_commit_zap_page(kvm, &invalid_list);
goal_nr_mmu_pages = kvm->arch.n_used_mmu_pages;
@@ -3719,11 +3735,7 @@ void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
while (kvm_mmu_available_pages(vcpu->kvm) < KVM_REFILL_PAGES &&
!list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
- struct kvm_mmu_page *sp;
-
- sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev,
- struct kvm_mmu_page, link);
- kvm_mmu_prepare_zap_page(vcpu->kvm, sp, &invalid_list);
+ pre_zap_one_sp(vcpu->kvm, &invalid_list);
++vcpu->kvm->stat.mmu_recycled;
}
kvm_mmu_commit_zap_page(vcpu->kvm, &invalid_list);
@@ -3890,16 +3902,6 @@ restart:
spin_unlock(&kvm->mmu_lock);
}
-static void kvm_mmu_remove_some_alloc_mmu_pages(struct kvm *kvm,
- struct list_head *invalid_list)
-{
- struct kvm_mmu_page *page;
-
- page = container_of(kvm->arch.active_mmu_pages.prev,
- struct kvm_mmu_page, link);
- kvm_mmu_prepare_zap_page(kvm, page, invalid_list);
-}
-
static int mmu_shrink(struct shrinker *shrink, struct shrink_control *sc)
{
struct kvm *kvm;
@@ -3919,8 +3921,7 @@ static int mmu_shrink(struct shrinker *shrink, struct
shrink_control *sc)
spin_lock(&kvm->mmu_lock);
if (!kvm_freed && nr_to_scan > 0 &&
kvm->arch.n_used_mmu_pages > 0) {
- kvm_mmu_remove_some_alloc_mmu_pages(kvm,
- &invalid_list);
+ pre_zap_one_sp(kvm, &invalid_list);
kvm_freed = kvm;
}
nr_to_scan--;
--
1.7.5.4
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