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authorCarsten Otte <cotte@de.ibm.com>2012-01-04 10:25:20 +0100
committerAvi Kivity <avi@redhat.com>2012-03-05 14:52:18 +0200
commite08b96371625aaa84cb03f51acc4c8e0be27403a (patch)
treed0b140e8558c6145e1a3183809c7797be443bd68 /Documentation/virtual
parenta138fe7535c0ec778465c7b54b1aaaf4cfd885b7 (diff)
downloadlinux-next-e08b96371625aaa84cb03f51acc4c8e0be27403a.tar.gz
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.txt7
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