KVM: Add support for in-kernel PIC emulation

Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 40 insertions, 6 deletions

diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index d154487b7729..09a04bc9541d 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -18,6 +18,7 @@
 #include "kvm.h"
 #include "x86_emulate.h"
 #include "segment_descriptor.h"
+#include "irq.h"
 
 #include <linux/kvm.h>
 #include <linux/module.h>
@@ -378,6 +379,7 @@ static void kvm_destroy_vm(struct kvm *kvm)
         spin_unlock(&kvm_lock);
         kvm_io_bus_destroy(&kvm->pio_bus);
         kvm_io_bus_destroy(&kvm->mmio_bus);
+        kfree(kvm->vpic);
         kvm_free_vcpus(kvm);
         kvm_free_physmem(kvm);
         kfree(kvm);
@@ -1258,7 +1260,8 @@ EXPORT_SYMBOL_GPL(emulate_instruction);
 
 int kvm_emulate_halt(struct kvm_vcpu *vcpu)
 {
-        if (vcpu->irq_summary)
+        if (vcpu->irq_summary ||
+                (irqchip_in_kernel(vcpu->kvm) && kvm_cpu_has_interrupt(vcpu)))
                 return 1;
 
         vcpu->run->exit_reason = KVM_EXIT_HLT;
@@ -2715,6 +2718,30 @@ static long kvm_vm_ioctl(struct file *filp,
                         goto out;
                 break;
         }
+        case KVM_CREATE_IRQCHIP:
+                r = -ENOMEM;
+                kvm->vpic = kvm_create_pic(kvm);
+                if (kvm->vpic)
+                        r = 0;
+                else
+                        goto out;
+                break;
+        case KVM_IRQ_LINE: {
+                struct kvm_irq_level irq_event;
+
+                r = -EFAULT;
+                if (copy_from_user(&irq_event, argp, sizeof irq_event))
+                        goto out;
+                if (irqchip_in_kernel(kvm)) {
+                        if (irq_event.irq < 16)
+                                kvm_pic_set_irq(pic_irqchip(kvm),
+                                        irq_event.irq,
+                                        irq_event.level);
+                        /* TODO: IOAPIC */
+                        r = 0;
+                }
+                break;
+        }
         default:
                 ;
         }
@@ -2825,12 +2852,19 @@ static long kvm_dev_ioctl(struct file *filp,
                 r = 0;
                 break;
         }
-        case KVM_CHECK_EXTENSION:
-                /*
-                 * No extensions defined at present.
-                 */
-                r = 0;
+        case KVM_CHECK_EXTENSION: {
+                int ext = (long)argp;
+
+                switch (ext) {
+                case KVM_CAP_IRQCHIP:
+                        r = 1;
+                        break;
+                default:
+                        r = 0;
+                        break;
+                }
                 break;
+        }
         case KVM_GET_VCPU_MMAP_SIZE:
                 r = -EINVAL;
                 if (arg)