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>
diff --git a/drivers/kvm/irq.c b/drivers/kvm/irq.c
new file mode 100644
index 0000000..b08005c
--- /dev/null
+++ b/drivers/kvm/irq.c
@@ -0,0 +1,61 @@
+/*
+ * irq.c: API for in kernel interrupt controller
+ * Copyright (c) 2007, Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
+ * Place - Suite 330, Boston, MA 02111-1307 USA.
+ * Authors:
+ * Yaozu (Eddie) Dong <Eddie.dong@intel.com>
+ *
+ */
+
+#include <linux/module.h>
+
+#include "kvm.h"
+#include "irq.h"
+
+/*
+ * check if there is pending interrupt without
+ * intack.
+ */
+int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
+{
+ struct kvm_pic *s = pic_irqchip(v->kvm);
+
+ if (s->output) /* PIC */
+ return 1;
+ /*
+ * TODO: APIC
+ */
+ return 0;
+}
+EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
+
+/*
+ * Read pending interrupt vector and intack.
+ */
+int kvm_cpu_get_interrupt(struct kvm_vcpu *v)
+{
+ struct kvm_pic *s = pic_irqchip(v->kvm);
+ int vector;
+
+ s->output = 0;
+ vector = kvm_pic_read_irq(s);
+ if (vector != -1)
+ return vector;
+ /*
+ * TODO: APIC
+ */
+ return -1;
+}
+EXPORT_SYMBOL_GPL(kvm_cpu_get_interrupt);