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KVM: in-kernel IOAPIC save and restore support

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This patch adds support for in-kernel ioapic save and restore (to
and from userspace). It uses the same get/set_irqchip ioctl as
in-kernel PIC.

Signed-off-by: Qing He <qing.he@intel.com>
Signed-off-by: Yaozu (Eddie) Dong <eddie.dong@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
He, Qing 2007-08-05 10:49:16 +03:00 committed by Avi Kivity
parent c52fb35a8b
commit 6bf9e962d1
3 changed files with 39 additions and 2 deletions
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2
drivers/kvm/irq.h
View file

@ -61,7 +61,7 @@ int kvm_cpu_get_interrupt(struct kvm_vcpu *v);
int kvm_cpu_has_interrupt(struct kvm_vcpu *v);
void kvm_pic_update_irq(struct kvm_pic *s);
#define IOAPIC_NUM_PINS 24
#define IOAPIC_NUM_PINS KVM_IOAPIC_NUM_PINS
#define IOAPIC_VERSION_ID 0x11 /* IOAPIC version */
#define IOAPIC_EDGE_TRIG 0
#define IOAPIC_LEVEL_TRIG 1

10
drivers/kvm/kvm_main.c
View file

@ -913,6 +913,11 @@ static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
&pic_irqchip(kvm)->pics[1],
sizeof(struct kvm_pic_state));
break;
case KVM_IRQCHIP_IOAPIC:
memcpy (&chip->chip.ioapic,
ioapic_irqchip(kvm),
sizeof(struct kvm_ioapic_state));
break;
default:
r = -EINVAL;
break;
@ -936,6 +941,11 @@ static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
&chip->chip.pic,
sizeof(struct kvm_pic_state));
break;
case KVM_IRQCHIP_IOAPIC:
memcpy (ioapic_irqchip(kvm),
&chip->chip.ioapic,
sizeof(struct kvm_ioapic_state));
break;
default:
r = -EINVAL;
break;

29
include/linux/kvm.h
View file

@ -45,7 +45,7 @@ struct kvm_irq_level {
__u32 level;
};
/* for KVM_GET_IRQCHIP / KVM_SET_IRQCHIP */
/* for KVM_GET_IRQCHIP and KVM_SET_IRQCHIP */
struct kvm_pic_state {
__u8 last_irr; /* edge detection */
__u8 irr; /* interrupt request register */
@ -65,9 +65,35 @@ struct kvm_pic_state {
__u8 elcr_mask;
};
#define KVM_IOAPIC_NUM_PINS 24
struct kvm_ioapic_state {
__u64 base_address;
__u32 ioregsel;
__u32 id;
__u32 irr;
__u32 pad;
union {
__u64 bits;
struct {
__u8 vector;
__u8 delivery_mode:3;
__u8 dest_mode:1;
__u8 delivery_status:1;
__u8 polarity:1;
__u8 remote_irr:1;
__u8 trig_mode:1;
__u8 mask:1;
__u8 reserve:7;
__u8 reserved[4];
__u8 dest_id;
} fields;
} redirtbl[KVM_IOAPIC_NUM_PINS];
};
enum kvm_irqchip_id {
KVM_IRQCHIP_PIC_MASTER = 0,
KVM_IRQCHIP_PIC_SLAVE = 1,
KVM_IRQCHIP_IOAPIC = 2,
};
struct kvm_irqchip {
@ -76,6 +102,7 @@ struct kvm_irqchip {
union {
char dummy[512]; /* reserving space */
struct kvm_pic_state pic;
struct kvm_ioapic_state ioapic;
} chip;
};