KVM: MMU: cleanup for hlist walk restart

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@cn.fujitsu.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 45f3aa5..7a17db1 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -1565,13 +1565,14 @@ 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;
 }
@@ -1585,13 +1586,14 @@ 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;
                }
        }
 }
@@ -2671,6 +2673,8 @@ 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;
@@ -2691,7 +2695,7 @@ 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;
                }
@@ -2900,10 +2904,11 @@ 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);