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KVM: s390: protvirt: Add KVM api documentation

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Add documentation for KVM_CAP_S390_PROTECTED capability and the
KVM_S390_PV_COMMAND ioctl.

Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
[borntraeger@de.ibm.com: patch merging, splitting, fixing]
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
This commit is contained in:
Janosch Frank 2019-11-08 05:05:26 -05:00 committed by Christian Borntraeger
parent 13da9ae1cd
commit 04ed89dc4a
1 changed files with 59 additions and 0 deletions
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59
Documentation/virt/kvm/api.rst
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@ -4648,6 +4648,54 @@ the clear cpu reset definition in the POP. However, the cpu is not put
into ESA mode. This reset is a superset of the initial reset.
4.125 KVM_S390_PV_COMMAND
-------------------------
:Capability: KVM_CAP_S390_PROTECTED
:Architectures: s390
:Type: vm ioctl
:Parameters: struct kvm_pv_cmd
:Returns: 0 on success, < 0 on error
::
struct kvm_pv_cmd {
__u32 cmd; /* Command to be executed */
__u16 rc; /* Ultravisor return code */
__u16 rrc; /* Ultravisor return reason code */
__u64 data; /* Data or address */
__u32 flags; /* flags for future extensions. Must be 0 for now */
__u32 reserved[3];
};
cmd values:
KVM_PV_ENABLE
Allocate memory and register the VM with the Ultravisor, thereby
donating memory to the Ultravisor that will become inaccessible to
KVM. All existing CPUs are converted to protected ones. After this
command has succeeded, any CPU added via hotplug will become
protected during its creation as well.
KVM_PV_DISABLE
Deregister the VM from the Ultravisor and reclaim the memory that
had been donated to the Ultravisor, making it usable by the kernel
again. All registered VCPUs are converted back to non-protected
ones.
KVM_PV_VM_SET_SEC_PARMS
Pass the image header from VM memory to the Ultravisor in
preparation of image unpacking and verification.
KVM_PV_VM_UNPACK
Unpack (protect and decrypt) a page of the encrypted boot image.
KVM_PV_VM_VERIFY
Verify the integrity of the unpacked image. Only if this succeeds,
KVM is allowed to start protected VCPUs.
5. The kvm_run structure
========================
@ -6026,3 +6074,14 @@ Architectures: s390
This capability indicates that the KVM_S390_NORMAL_RESET and
KVM_S390_CLEAR_RESET ioctls are available.
8.23 KVM_CAP_S390_PROTECTED
Architecture: s390
This capability indicates that the Ultravisor has been initialized and
KVM can therefore start protected VMs.
This capability governs the KVM_S390_PV_COMMAND ioctl and the
KVM_MP_STATE_LOAD MP_STATE. KVM_SET_MP_STATE can fail for protected
guests when the state change is invalid.