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| author |   Carsten Otte <cotte@de.ibm.com> | 2012-01-04 10:25:20 +0100 |
|---|---|---|
| committer |   Avi Kivity <avi@redhat.com> | 2012-03-05 14:52:18 +0200 |
| commit | e08b96371625aaa84cb03f51acc4c8e0be27403a (patch) | |
| tree | d0b140e8558c6145e1a3183809c7797be443bd68 /Documentation/virtual | |
| parent | KVM: MMU: remove the redundant get_written_sptes (diff) | |
| download | linux-dev-e08b96371625aaa84cb03f51acc4c8e0be27403a.tar.xz linux-dev-e08b96371625aaa84cb03f51acc4c8e0be27403a.zip | |
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>
Diffstat (limited to 'Documentation/virtual')
| -rw-r--r-- | Documentation/virtual/kvm/api.txt | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt index e1d94bf4056e..579d40b26a5a 100644 --- a/Documentation/virtual/kvm/api.txt +++ b/Documentation/virtual/kvm/api.txt @@ -95,7 +95,7 @@ described as 'basic' will be available. Capability: basic Architectures: all Type: system ioctl -Parameters: none +Parameters: machine type identifier (KVM_VM_*) Returns: a VM fd that can be used to control the new virtual machine. The new VM has no virtual cpus and no memory. An mmap() of a VM fd @@ -103,6 +103,11 @@ will access the virtual machine's physical address space; offset zero corresponds to guest physical address zero. Use of mmap() on a VM fd is discouraged if userspace memory allocation (KVM_CAP_USER_MEMORY) is available. +You most certainly want to use 0 as machine type. + +In order to create user controlled virtual machines on S390, check +KVM_CAP_S390_UCONTROL and use the flag KVM_VM_S390_UCONTROL as +privileged user (CAP_SYS_ADMIN). 4.3 KVM_GET_MSR_INDEX_LIST |