KVM: Add get/set irqchip ioctls for in-kernel PIC live migration support

This patch adds two new ioctls to dump and write kernel irqchips for
save/restore and live migration. PIC s/r and l/m is implemented in this
patch.

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

1 files changed, 36 insertions, 0 deletions

diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index b0a13d1b34cc..6560f11870fd 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -45,6 +45,40 @@ struct kvm_irq_level {
         __u32 level;
 };
 
+/* for KVM_GET_IRQCHIP / KVM_SET_IRQCHIP */
+struct kvm_pic_state {
+        __u8 last_irr;  /* edge detection */
+        __u8 irr;               /* interrupt request register */
+        __u8 imr;               /* interrupt mask register */
+        __u8 isr;               /* interrupt service register */
+        __u8 priority_add;      /* highest irq priority */
+        __u8 irq_base;
+        __u8 read_reg_select;
+        __u8 poll;
+        __u8 special_mask;
+        __u8 init_state;
+        __u8 auto_eoi;
+        __u8 rotate_on_auto_eoi;
+        __u8 special_fully_nested_mode;
+        __u8 init4;             /* true if 4 byte init */
+        __u8 elcr;              /* PIIX edge/trigger selection */
+        __u8 elcr_mask;
+};
+
+enum kvm_irqchip_id {
+        KVM_IRQCHIP_PIC_MASTER   = 0,
+        KVM_IRQCHIP_PIC_SLAVE    = 1,
+};
+
+struct kvm_irqchip {
+        __u32 chip_id;
+        __u32 pad;
+        union {
+                char dummy[512];  /* reserving space */
+                struct kvm_pic_state pic;
+        } chip;
+};
+
 enum kvm_exit_reason {
         KVM_EXIT_UNKNOWN          = 0,
         KVM_EXIT_EXCEPTION        = 1,
@@ -299,6 +333,8 @@ struct kvm_signal_mask {
 /* Device model IOC */
 #define KVM_CREATE_IRQCHIP        _IO(KVMIO,  0x60)
 #define KVM_IRQ_LINE              _IOW(KVMIO, 0x61, struct kvm_irq_level)
+#define KVM_GET_IRQCHIP           _IOWR(KVMIO, 0x62, struct kvm_irqchip)
+#define KVM_SET_IRQCHIP           _IOR(KVMIO,  0x63, struct kvm_irqchip)
 
 /*
  * ioctls for vcpu fds