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KVM: s390: pv: api documentation for asynchronous destroy 

Add documentation for the new commands added to the KVM_S390_PV_COMMAND
ioctl.

Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Reviewed-by: Janosch Frank <frankja@linux.ibm.com>
Link: https://lore.kernel.org/r/20221111170632.77622-3-imbrenda@linux.ibm.com
Message-Id: <20221111170632.77622-3-imbrenda@linux.ibm.com>
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
This commit is contained in:
Claudio Imbrenda 2022-11-11 18:06:28 +01:00 committed by Janosch Frank
parent fb491d5500
commit d9459922a1
1 changed files with 37 additions and 4 deletions
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41
Documentation/virt/kvm/api.rst
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@ -5163,10 +5163,13 @@ KVM_PV_ENABLE
===== =============================
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.
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. If a
previous protected VM had been prepared for asynchonous teardown with
KVM_PV_ASYNC_CLEANUP_PREPARE and not subsequently torn down with
KVM_PV_ASYNC_CLEANUP_PERFORM, it will be torn down in this call
together with the current protected VM.
KVM_PV_VM_SET_SEC_PARMS
Pass the image header from VM memory to the Ultravisor in
@ -5289,6 +5292,36 @@ KVM_PV_DUMP
authentication tag all of which are needed to decrypt the dump at a
later time.
KVM_PV_ASYNC_CLEANUP_PREPARE
:Capability: KVM_CAP_S390_PROTECTED_ASYNC_DISABLE
Prepare the current protected VM for asynchronous teardown. Most
resources used by the current protected VM will be set aside for a
subsequent asynchronous teardown. The current protected VM will then
resume execution immediately as non-protected. There can be at most
one protected VM prepared for asynchronous teardown at any time. If
a protected VM had already been prepared for teardown without
subsequently calling KVM_PV_ASYNC_CLEANUP_PERFORM, this call will
fail. In that case, the userspace process should issue a normal
KVM_PV_DISABLE. The resources set aside with this call will need to
be cleaned up with a subsequent call to KVM_PV_ASYNC_CLEANUP_PERFORM
or KVM_PV_DISABLE, otherwise they will be cleaned up when KVM
terminates. KVM_PV_ASYNC_CLEANUP_PREPARE can be called again as soon
as cleanup starts, i.e. before KVM_PV_ASYNC_CLEANUP_PERFORM finishes.
KVM_PV_ASYNC_CLEANUP_PERFORM
:Capability: KVM_CAP_S390_PROTECTED_ASYNC_DISABLE
Tear down the protected VM previously prepared for teardown with
KVM_PV_ASYNC_CLEANUP_PREPARE. The resources that had been set aside
will be freed during the execution of this command. This PV command
should ideally be issued by userspace from a separate thread. If a
fatal signal is received (or the process terminates naturally), the
command will terminate immediately without completing, and the normal
KVM shutdown procedure will take care of cleaning up all remaining
protected VMs, including the ones whose teardown was interrupted by
process termination.
4.126 KVM_XEN_HVM_SET_ATTR
--------------------------