KVM: s390: add parameter for KVM_CREATE_VM

This patch introduces a new config option for user controlled kernel
virtual machines. It introduces a parameter to KVM_CREATE_VM that
allows to set bits that alter the capabilities of the newly created
virtual machine.
The parameter is passed to kvm_arch_init_vm for all architectures.
The only valid modifier bit for now is KVM_VM_S390_UCONTROL.
This requires CAP_SYS_ADMIN privileges and creates a user controlled
virtual machine on s390 architectures.

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

1 files changed, 5 insertions, 8 deletions

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index a91f980077d8..32e3b048a6cf 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -449,7 +449,7 @@ static void kvm_init_memslots_id(struct kvm *kvm)
                 slots->id_to_index[i] = slots->memslots[i].id = i;
 }
 
-static struct kvm *kvm_create_vm(void)
+static struct kvm *kvm_create_vm(unsigned long type)
 {
         int r, i;
         struct kvm *kvm = kvm_arch_alloc_vm();
@@ -457,7 +457,7 @@ static struct kvm *kvm_create_vm(void)
         if (!kvm)
                 return ERR_PTR(-ENOMEM);
 
-        r = kvm_arch_init_vm(kvm);
+        r = kvm_arch_init_vm(kvm, type);
         if (r)
                 goto out_err_nodisable;
 
@@ -2198,12 +2198,12 @@ static struct file_operations kvm_vm_fops = {
         .llseek         = noop_llseek,
 };
 
-static int kvm_dev_ioctl_create_vm(void)
+static int kvm_dev_ioctl_create_vm(unsigned long type)
 {
         int r;
         struct kvm *kvm;
 
-        kvm = kvm_create_vm();
+        kvm = kvm_create_vm(type);
         if (IS_ERR(kvm))
                 return PTR_ERR(kvm);
 #ifdef KVM_COALESCED_MMIO_PAGE_OFFSET
@@ -2254,10 +2254,7 @@ static long kvm_dev_ioctl(struct file *filp,
                 r = KVM_API_VERSION;
                 break;
         case KVM_CREATE_VM:
-                r = -EINVAL;
-                if (arg)
-                        goto out;
-                r = kvm_dev_ioctl_create_vm();
+                r = kvm_dev_ioctl_create_vm(arg);
                 break;
         case KVM_CHECK_EXTENSION:
                 r = kvm_dev_ioctl_check_extension_generic(arg);