Prev: vmscan: simplify shrink_inactive_list()
Next: [PATCH v2 2/5] KVM MMU: fix kvm_mmu_zap_page() and its calling path
From: Xiao Guangrong on 15 Apr 2010 09:30
Quote from Avi:

|Just change the assignment to a 'goto restart;' please,
|I don't like playing with list_for_each internals.

Signed-off-by: Xiao Guangrong <xiaoguangrong(a)cn.fujitsu.com>
---
arch/x86/kvm/mmu.c | 15 ++++++++++-----
1 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 41cccd4..a32c60c 100644
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1567,13 +1567,14 @@ static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
r = 0;
index = kvm_page_table_hashfn(gfn);
bucket = &kvm->arch.mmu_page_hash[index];
+restart:
hlist_for_each_entry_safe(sp, node, n, bucket, hash_link)
if (sp->gfn == gfn && !sp->role.direct) {
pgprintk("%s: gfn %lx role %x\n", __func__, gfn,
sp->role.word);
r = 1;
if (kvm_mmu_zap_page(kvm, sp))
- n = bucket->first;
+ goto restart;
}
return r;
}
@@ -1587,13 +1588,14 @@ static void mmu_unshadow(struct kvm *kvm, gfn_t gfn)

index = kvm_page_table_hashfn(gfn);
bucket = &kvm->arch.mmu_page_hash[index];
+restart:
hlist_for_each_entry_safe(sp, node, nn, bucket, hash_link) {
if (sp->gfn == gfn && !sp->role.direct
&& !sp->role.invalid) {
pgprintk("%s: zap %lx %x\n",
__func__, gfn, sp->role.word);
if (kvm_mmu_zap_page(kvm, sp))
- nn = bucket->first;
+ goto restart;
}
}
}
@@ -2673,6 +2675,8 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
}
index = kvm_page_table_hashfn(gfn);
bucket = &vcpu->kvm->arch.mmu_page_hash[index];
+
+restart:
hlist_for_each_entry_safe(sp, node, n, bucket, hash_link) {
if (sp->gfn != gfn || sp->role.direct || sp->role.invalid)
continue;
@@ -2693,7 +2697,7 @@ void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
pgprintk("misaligned: gpa %llx bytes %d role %x\n",
gpa, bytes, sp->role.word);
if (kvm_mmu_zap_page(vcpu->kvm, sp))
- n = bucket->first;
+ goto restart;
++vcpu->kvm->stat.mmu_flooded;
continue;
}
@@ -2902,10 +2906,11 @@ void kvm_mmu_zap_all(struct kvm *kvm)
struct kvm_mmu_page *sp, *node;

spin_lock(&kvm->mmu_lock);
+restart:
list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link)
if (kvm_mmu_zap_page(kvm, sp))
- node = container_of(kvm->arch.active_mmu_pages.next,
- struct kvm_mmu_page, link);
+ goto restart;
+
spin_unlock(&kvm->mmu_lock);

kvm_flush_remote_tlbs(kvm);
--
1.6.1.2

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Prev: vmscan: simplify shrink_inactive_list()
Next: [PATCH v2 2/5] KVM MMU: fix kvm_mmu_zap_page() and its calling path