KVM: add ioctls to save/store mpstate

So userspace can save/restore the mpstate during migration.

[avi: export the #define constants describing the value]
[christian: add s390 stubs]
[avi: ditto for ia64]

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

diff --git a/arch/ia64/kvm/kvm-ia64.c b/arch/ia64/kvm/kvm-ia64.c
index f7589db..6df0732 100644 (file)
--- a/arch/ia64/kvm/kvm-ia64.c
+++ b/arch/ia64/kvm/kvm-ia64.c
@@ -1792,3 +1792,15 @@ int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
 {
        return vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE;
 }
+
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+                                   struct kvm_mp_state *mp_state)
+{
+       return -EINVAL;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+                                   struct kvm_mp_state *mp_state)
+{
+       return -EINVAL;
+}

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index d966137..98d1e73 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -414,6 +414,18 @@ int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
        return -EINVAL; /* not implemented yet */
 }
 
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+                                   struct kvm_mp_state *mp_state)
+{
+       return -EINVAL; /* not implemented yet */
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+                                   struct kvm_mp_state *mp_state)
+{
+       return -EINVAL; /* not implemented yet */
+}
+
 static void __vcpu_run(struct kvm_vcpu *vcpu)
 {
        memcpy(&vcpu->arch.sie_block->gg14, &vcpu->arch.guest_gprs[14], 16);

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index b364d19..5c3c9d3 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -817,6 +817,7 @@ int kvm_dev_ioctl_check_extension(long ext)
        case KVM_CAP_CLOCKSOURCE:
        case KVM_CAP_PIT:
        case KVM_CAP_NOP_IO_DELAY:
+       case KVM_CAP_MP_STATE:
                r = 1;
                break;
        case KVM_CAP_VAPIC:
@@ -3083,6 +3084,24 @@ int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
        return 0;
 }
 
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+                                   struct kvm_mp_state *mp_state)
+{
+       vcpu_load(vcpu);
+       mp_state->mp_state = vcpu->arch.mp_state;
+       vcpu_put(vcpu);
+       return 0;
+}
+
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+                                   struct kvm_mp_state *mp_state)
+{
+       vcpu_load(vcpu);
+       vcpu->arch.mp_state = mp_state->mp_state;
+       vcpu_put(vcpu);
+       return 0;
+}
+
 static void set_segment(struct kvm_vcpu *vcpu,
                        struct kvm_segment *var, int seg)
 {

diff --git a/include/asm-x86/kvm_host.h b/include/asm-x86/kvm_host.h
index f35a6ad..9d963cd 100644 (file)
--- a/include/asm-x86/kvm_host.h
+++ b/include/asm-x86/kvm_host.h
@@ -227,11 +227,6 @@ struct kvm_vcpu_arch {
        u64 shadow_efer;
        u64 apic_base;
        struct kvm_lapic *apic;    /* kernel irqchip context */
-#define KVM_MP_STATE_RUNNABLE          0
-#define KVM_MP_STATE_UNINITIALIZED     1
-#define KVM_MP_STATE_INIT_RECEIVED     2
-#define KVM_MP_STATE_SIPI_RECEIVED     3
-#define KVM_MP_STATE_HALTED            4
        int mp_state;
        int sipi_vector;
        u64 ia32_misc_enable_msr;

diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index d302d63..f8e211d 100644 (file)
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -228,6 +228,18 @@ struct kvm_vapic_addr {
        __u64 vapic_addr;
 };
 
+/* for KVM_SET_MPSTATE */
+
+#define KVM_MP_STATE_RUNNABLE          0
+#define KVM_MP_STATE_UNINITIALIZED     1
+#define KVM_MP_STATE_INIT_RECEIVED     2
+#define KVM_MP_STATE_HALTED            3
+#define KVM_MP_STATE_SIPI_RECEIVED     4
+
+struct kvm_mp_state {
+       __u32 mp_state;
+};
+
 struct kvm_s390_psw {
        __u64 mask;
        __u64 addr;
@@ -326,6 +338,7 @@ struct kvm_trace_rec {
 #define KVM_CAP_PIT 11
 #define KVM_CAP_NOP_IO_DELAY 12
 #define KVM_CAP_PV_MMU 13
+#define KVM_CAP_MP_STATE 14
 
 /*
  * ioctls for VM fds
@@ -387,5 +400,7 @@ struct kvm_trace_rec {
 #define KVM_S390_SET_INITIAL_PSW  _IOW(KVMIO,  0x96, struct kvm_s390_psw)
 /* initial reset for s390 */
 #define KVM_S390_INITIAL_RESET    _IO(KVMIO,  0x97)
+#define KVM_GET_MP_STATE          _IOR(KVMIO,  0x98, struct kvm_mp_state)
+#define KVM_SET_MP_STATE          _IOW(KVMIO,  0x99, struct kvm_mp_state)
 
 #endif

diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 0bc4003..81d4c33 100644 (file)
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -237,6 +237,10 @@ int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
                                  struct kvm_sregs *sregs);
 int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
                                  struct kvm_sregs *sregs);
+int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
+                                   struct kvm_mp_state *mp_state);
+int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
+                                   struct kvm_mp_state *mp_state);
 int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
                                    struct kvm_debug_guest *dbg);
 int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run);

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 47cbc6e..0998455 100644 (file)
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -979,6 +979,30 @@ out_free2:
                r = 0;
                break;
        }
+       case KVM_GET_MP_STATE: {
+               struct kvm_mp_state mp_state;
+
+               r = kvm_arch_vcpu_ioctl_get_mpstate(vcpu, &mp_state);
+               if (r)
+                       goto out;
+               r = -EFAULT;
+               if (copy_to_user(argp, &mp_state, sizeof mp_state))
+                       goto out;
+               r = 0;
+               break;
+       }
+       case KVM_SET_MP_STATE: {
+               struct kvm_mp_state mp_state;
+
+               r = -EFAULT;
+               if (copy_from_user(&mp_state, argp, sizeof mp_state))
+                       goto out;
+               r = kvm_arch_vcpu_ioctl_set_mpstate(vcpu, &mp_state);
+               if (r)
+                       goto out;
+               r = 0;
+               break;
+       }
        case KVM_TRANSLATE: {
                struct kvm_translation tr;