KVM: handle more completed apfs if possible

If it's no need to inject async #PF to PV guest we can handle
more completed apfs at one time, so we can retry guest #PF
as early as possible

Signed-off-by: Xiao Guangrong <xiaoguangrong@cn.fujitsu.com>
Acked-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 16 insertions, 16 deletions

diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 60df9e059e69..100c66ee0220 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -124,24 +124,24 @@ void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu)
 {
         struct kvm_async_pf *work;
 
-        if (list_empty_careful(&vcpu->async_pf.done) ||
-            !kvm_arch_can_inject_async_page_present(vcpu))
-                return;
-
-        spin_lock(&vcpu->async_pf.lock);
-        work = list_first_entry(&vcpu->async_pf.done, typeof(*work), link);
-        list_del(&work->link);
-        spin_unlock(&vcpu->async_pf.lock);
+        while (!list_empty_careful(&vcpu->async_pf.done) &&
+              kvm_arch_can_inject_async_page_present(vcpu)) {
+                spin_lock(&vcpu->async_pf.lock);
+                work = list_first_entry(&vcpu->async_pf.done, typeof(*work),
+                                              link);
+                list_del(&work->link);
+                spin_unlock(&vcpu->async_pf.lock);
 
-        if (work->page)
-                kvm_arch_async_page_ready(vcpu, work);
-        kvm_arch_async_page_present(vcpu, work);
+                if (work->page)
+                        kvm_arch_async_page_ready(vcpu, work);
+                kvm_arch_async_page_present(vcpu, work);
 
-        list_del(&work->queue);
-        vcpu->async_pf.queued--;
-        if (work->page)
-                put_page(work->page);
-        kmem_cache_free(async_pf_cache, work);
+                list_del(&work->queue);
+                vcpu->async_pf.queued--;
+                if (work->page)
+                        put_page(work->page);
+                kmem_cache_free(async_pf_cache, work);
+        }
 }
 
 int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,