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>
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index b0a13d1..6560f11 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -45,6 +45,40 @@
__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 @@
/* 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