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qapi/s390x/cpu topology: set-cpu-topology qmp command

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The modification of the CPU attributes are done through a monitor
command.

It allows to move the core inside the topology tree to optimize
the cache usage in the case the host's hypervisor previously
moved the CPU.

The same command allows to modify the CPU attributes modifiers
like polarization entitlement and the dedicated attribute to notify
the guest if the host admin modified scheduling or dedication of a vCPU.

With this knowledge the guest has the possibility to optimize the
usage of the vCPUs.

The command has a feature unstable for the moment.

Signed-off-by: Pierre Morel <pmorel@linux.ibm.com>
Reviewed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Co-developed-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Nina Schoetterl-Glausch <nsg@linux.ibm.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Message-ID: <20231016183925.2384704-10-nsg@linux.ibm.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
This commit is contained in:
Pierre Morel
2023-10-16 20:39:13 +02:00
committed by Thomas Huth
parent f530b9e7da
commit a457c2ab5a
2 changed files with 174 additions and 0 deletions
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42
qapi/machine-target.json
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@@ -4,6 +4,8 @@
# This work is licensed under the terms of the GNU GPL, version 2 or later.
# See the COPYING file in the top-level directory.
{ 'include': 'machine-common.json' }
##
# @CpuModelInfo:
#
@@ -375,3 +377,43 @@
'data': [ 'horizontal', 'vertical' ],
'if': 'TARGET_S390X'
}
##
# @set-cpu-topology:
#
# Modify the topology by moving the CPU inside the topology tree,
# or by changing a modifier attribute of a CPU.
# Absent values will not be modified.
#
# @core-id: the vCPU ID to be moved
#
# @socket-id: destination socket to move the vCPU to
#
# @book-id: destination book to move the vCPU to
#
# @drawer-id: destination drawer to move the vCPU to
#
# @entitlement: entitlement to set
#
# @dedicated: whether the provisioning of real to virtual CPU is dedicated
#
# Features:
#
# @unstable: This command is experimental.
#
# Returns: Nothing on success.
#
# Since: 8.2
##
{ 'command': 'set-cpu-topology',
'data': {
'core-id': 'uint16',
'*socket-id': 'uint16',
'*book-id': 'uint16',
'*drawer-id': 'uint16',
'*entitlement': 'CpuS390Entitlement',
'*dedicated': 'bool'
},
'features': [ 'unstable' ],
'if': { 'all': [ 'TARGET_S390X' , 'CONFIG_KVM' ] }
}