KVM: s390: Base infrastructure for enabling capabilities.

Make s390 support KVM_ENABLE_CAP.

Reviewed-by: Marcelo Tosatti <mtosatti@redhat.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
index 8a0de309932f880ae6c156baf14698f8f8262170..73bd159c5559027219bc3c355c2b9c768982075e 100644 (file)
--- a/Documentation/virtual/kvm/api.txt
+++ b/Documentation/virtual/kvm/api.txt
@@ -913,7 +913,7 @@ documentation when it pops into existence).
 4.37 KVM_ENABLE_CAP
 
 Capability: KVM_CAP_ENABLE_CAP
-Architectures: ppc
+Architectures: ppc, s390
 Type: vcpu ioctl
 Parameters: struct kvm_enable_cap (in)
 Returns: 0 on success; -1 on error

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index f718bc65835c9163779d5d212ccbe19e41a1809a..5ff26033825c031883d24cf9cc7d071145616891 100644 (file)
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -140,6 +140,7 @@ int kvm_dev_ioctl_check_extension(long ext)
 #endif
        case KVM_CAP_SYNC_REGS:
        case KVM_CAP_ONE_REG:
+       case KVM_CAP_ENABLE_CAP:
                r = 1;
                break;
        case KVM_CAP_NR_VCPUS:
@@ -808,6 +809,22 @@ int kvm_s390_vcpu_store_status(struct kvm_vcpu *vcpu, unsigned long addr)
        return 0;
 }
 
+static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
+                                    struct kvm_enable_cap *cap)
+{
+       int r;
+
+       if (cap->flags)
+               return -EINVAL;
+
+       switch (cap->cap) {
+       default:
+               r = -EINVAL;
+               break;
+       }
+       return r;
+}
+
 long kvm_arch_vcpu_ioctl(struct file *filp,
                         unsigned int ioctl, unsigned long arg)
 {
@@ -894,6 +911,15 @@ long kvm_arch_vcpu_ioctl(struct file *filp,
                        r = 0;
                break;
        }
+       case KVM_ENABLE_CAP:
+       {
+               struct kvm_enable_cap cap;
+               r = -EFAULT;
+               if (copy_from_user(&cap, argp, sizeof(cap)))
+                       break;
+               r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
+               break;
+       }
        default:
                r = -ENOTTY;
        }