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authorSheng Yang <sheng.yang@intel.com>2008-03-04 00:50:59 +0800
committerAvi Kivity <avi@qumranet.com>2008-04-27 12:00:22 +0300
commite0f63cb9277b64850854aee301762beeeb463473 (patch)
treeae10bac92ee6cc1a658b479a311fac67ebd3524c
parent7837699fa6d7adf81f26ab73a5f6897ea1ab9d6a (diff)
KVM: Add save/restore supporting of in kernel PIT
Signed-off-by: Sheng Yang <sheng.yang@intel.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
-rw-r--r--arch/x86/kvm/i8254.c7
-rw-r--r--arch/x86/kvm/i8254.h1
-rw-r--r--arch/x86/kvm/x86.c48
-rw-r--r--include/asm-x86/kvm.h21
-rw-r--r--include/linux/kvm.h2
5 files changed, 79 insertions, 0 deletions
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c
index c7435093bbe..8642f9d1206 100644
--- a/arch/x86/kvm/i8254.c
+++ b/arch/x86/kvm/i8254.c
@@ -288,6 +288,13 @@ static void pit_load_count(struct kvm *kvm, int channel, u32 val)
}
}
+void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val)
+{
+ mutex_lock(&kvm->arch.vpit->pit_state.lock);
+ pit_load_count(kvm, channel, val);
+ mutex_unlock(&kvm->arch.vpit->pit_state.lock);
+}
+
static void pit_ioport_write(struct kvm_io_device *this,
gpa_t addr, int len, const void *data)
{
diff --git a/arch/x86/kvm/i8254.h b/arch/x86/kvm/i8254.h
index d77d6b795a1..fe09eced778 100644
--- a/arch/x86/kvm/i8254.h
+++ b/arch/x86/kvm/i8254.h
@@ -55,6 +55,7 @@ struct kvm_pit {
void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu);
void kvm_pit_timer_intr_post(struct kvm_vcpu *vcpu, int vec);
+void kvm_pit_load_count(struct kvm *kvm, int channel, u32 val);
struct kvm_pit *kvm_create_pit(struct kvm *kvm);
void kvm_free_pit(struct kvm *kvm);
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index c33a4578132..621a8e362fe 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -1504,6 +1504,23 @@ static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
return r;
}
+static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
+{
+ int r = 0;
+
+ memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
+ return r;
+}
+
+static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
+{
+ int r = 0;
+
+ memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
+ kvm_pit_load_count(kvm, 0, ps->channels[0].count);
+ return r;
+}
+
/*
* Get (and clear) the dirty memory log for a memory slot.
*/
@@ -1657,6 +1674,37 @@ long kvm_arch_vm_ioctl(struct file *filp,
r = 0;
break;
}
+ case KVM_GET_PIT: {
+ struct kvm_pit_state ps;
+ r = -EFAULT;
+ if (copy_from_user(&ps, argp, sizeof ps))
+ goto out;
+ r = -ENXIO;
+ if (!kvm->arch.vpit)
+ goto out;
+ r = kvm_vm_ioctl_get_pit(kvm, &ps);
+ if (r)
+ goto out;
+ r = -EFAULT;
+ if (copy_to_user(argp, &ps, sizeof ps))
+ goto out;
+ r = 0;
+ break;
+ }
+ case KVM_SET_PIT: {
+ struct kvm_pit_state ps;
+ r = -EFAULT;
+ if (copy_from_user(&ps, argp, sizeof ps))
+ goto out;
+ r = -ENXIO;
+ if (!kvm->arch.vpit)
+ goto out;
+ r = kvm_vm_ioctl_set_pit(kvm, &ps);
+ if (r)
+ goto out;
+ r = 0;
+ break;
+ }
default:
;
}
diff --git a/include/asm-x86/kvm.h b/include/asm-x86/kvm.h
index 7a71120426a..12b4b25371d 100644
--- a/include/asm-x86/kvm.h
+++ b/include/asm-x86/kvm.h
@@ -188,4 +188,25 @@ struct kvm_cpuid2 {
struct kvm_cpuid_entry2 entries[0];
};
+/* for KVM_GET_PIT and KVM_SET_PIT */
+struct kvm_pit_channel_state {
+ __u32 count; /* can be 65536 */
+ __u16 latched_count;
+ __u8 count_latched;
+ __u8 status_latched;
+ __u8 status;
+ __u8 read_state;
+ __u8 write_state;
+ __u8 write_latch;
+ __u8 rw_mode;
+ __u8 mode;
+ __u8 bcd;
+ __u8 gate;
+ __s64 count_load_time;
+};
+
+struct kvm_pit_state {
+ struct kvm_pit_channel_state channels[3];
+};
+
#endif
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index cefa9a2c7b8..a2f3274016e 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -260,6 +260,8 @@ struct kvm_vapic_addr {
#define KVM_GET_IRQCHIP _IOWR(KVMIO, 0x62, struct kvm_irqchip)
#define KVM_SET_IRQCHIP _IOR(KVMIO, 0x63, struct kvm_irqchip)
#define KVM_CREATE_PIT _IO(KVMIO, 0x64)
+#define KVM_GET_PIT _IOWR(KVMIO, 0x65, struct kvm_pit_state)
+#define KVM_SET_PIT _IOR(KVMIO, 0x66, struct kvm_pit_state)
/*
* ioctls for vcpu fds