Merge tag 'kvm-s390-20140130' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD

Two new features are added by this patch set:
- The floating interrupt controller (flic) that allows us to inject,
  clear and inspect non-vcpu local interrupts. This also gives us an
  opportunity to fix deficiencies in our existing interrupt definitions.
- Support for asynchronous page faults via the pfault mechanism. Testing
  show significant guest performance improvements under host swap.

3 files changed, 32 insertions, 2 deletions

diff --git a/virt/kvm/Kconfig b/virt/kvm/Kconfig
index fbe1a48bd629..13f2d19793e3 100644
--- a/virt/kvm/Kconfig
+++ b/virt/kvm/Kconfig
@@ -22,6 +22,10 @@ config KVM_MMIO
 config KVM_ASYNC_PF
        bool
 
+# Toggle to switch between direct notification and batch job
+config KVM_ASYNC_PF_SYNC
+       bool
+
 config HAVE_KVM_MSI
        bool
 
diff --git a/virt/kvm/async_pf.c b/virt/kvm/async_pf.c
index 8631d9c14320..889aad022014 100644
--- a/virt/kvm/async_pf.c
+++ b/virt/kvm/async_pf.c
@@ -28,6 +28,21 @@
 #include "async_pf.h"
 #include <trace/events/kvm.h>
 
+static inline void kvm_async_page_present_sync(struct kvm_vcpu *vcpu,
+                                               struct kvm_async_pf *work)
+{
+#ifdef CONFIG_KVM_ASYNC_PF_SYNC
+        kvm_arch_async_page_present(vcpu, work);
+#endif
+}
+static inline void kvm_async_page_present_async(struct kvm_vcpu *vcpu,
+                                                struct kvm_async_pf *work)
+{
+#ifndef CONFIG_KVM_ASYNC_PF_SYNC
+        kvm_arch_async_page_present(vcpu, work);
+#endif
+}
+
 static struct kmem_cache *async_pf_cache;
 
 int kvm_async_pf_init(void)
@@ -69,6 +84,7 @@ static void async_pf_execute(struct work_struct *work)
         down_read(&mm->mmap_sem);
         get_user_pages(current, mm, addr, 1, 1, 0, NULL, NULL);
         up_read(&mm->mmap_sem);
+        kvm_async_page_present_sync(vcpu, apf);
         unuse_mm(mm);
 
         spin_lock(&vcpu->async_pf.lock);
@@ -97,11 +113,16 @@ void kvm_clear_async_pf_completion_queue(struct kvm_vcpu *vcpu)
                         list_entry(vcpu->async_pf.queue.next,
                                    typeof(*work), queue);
                 list_del(&work->queue);
+
+#ifdef CONFIG_KVM_ASYNC_PF_SYNC
+                flush_work(&work->work);
+#else
                 if (cancel_work_sync(&work->work)) {
                         mmdrop(work->mm);
                         kvm_put_kvm(vcpu->kvm); /* == work->vcpu->kvm */
                         kmem_cache_free(async_pf_cache, work);
                 }
+#endif
         }
 
         spin_lock(&vcpu->async_pf.lock);
@@ -138,7 +159,7 @@ void kvm_check_async_pf_completion(struct kvm_vcpu *vcpu)
         }
 }
 
-int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
+int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, unsigned long hva,
                        struct kvm_arch_async_pf *arch)
 {
         struct kvm_async_pf *work;
@@ -159,7 +180,7 @@ int kvm_setup_async_pf(struct kvm_vcpu *vcpu, gva_t gva, gfn_t gfn,
         work->wakeup_all = false;
         work->vcpu = vcpu;
         work->gva = gva;
-        work->addr = gfn_to_hva(vcpu->kvm, gfn);
+        work->addr = hva;
         work->arch = *arch;
         work->mm = current->mm;
         atomic_inc(&work->mm->mm_count);
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 03a0381b1cb7..a9e999a48e43 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2284,6 +2284,11 @@ static int kvm_ioctl_create_device(struct kvm *kvm,
                 ops = &kvm_arm_vgic_v2_ops;
                 break;
 #endif
+#ifdef CONFIG_S390
+        case KVM_DEV_TYPE_FLIC:
+                ops = &kvm_flic_ops;
+                break;
+#endif
         default:
                 return -ENODEV;
         }