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

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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>
This commit is contained in:
He, Qing 2007-07-26 11:05:18 +03:00 • committed by Avi Kivity
parent 9cf98828d1
commit 6ceb9d791e
4 changed files with 124 additions and 0 deletions
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36
include/linux/kvm.h
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@ -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