diff options
Diffstat (limited to 'qemu-options.hx')
| -rw-r--r-- | qemu-options.hx | 24 |
1 files changed, 16 insertions, 8 deletions
diff --git a/qemu-options.hx b/qemu-options.hx index ceca528..8ef1781 100644 --- a/qemu-options.hx +++ b/qemu-options.hx @@ -220,9 +220,14 @@ SRST Simulate a SMP system with '\ ``n``\ ' CPUs initially present on the machine type board. On boards supporting CPU hotplug, the optional '\ ``maxcpus``\ ' parameter can be set to enable further CPUs to be - added at runtime. If omitted the maximum number of CPUs will be - set to match the initial CPU count. Both parameters are subject to - an upper limit that is determined by the specific machine type chosen. + added at runtime. When both parameters are omitted, the maximum number + of CPUs will be calculated from the provided topology members and the + initial CPU count will match the maximum number. When only one of them + is given then the omitted one will be set to its counterpart's value. + Both parameters may be specified, but the maximum number of CPUs must + be equal to or greater than the initial CPU count. Both parameters are + subject to an upper limit that is determined by the specific machine + type chosen. To control reporting of CPU topology information, the number of sockets, dies per socket, cores per die, and threads per core can be specified. @@ -233,11 +238,14 @@ SRST of computing the CPU maximum count. Either the initial CPU count, or at least one of the topology parameters - must be specified. Values for any omitted parameters will be computed - from those which are given. Historically preference was given to the - coarsest topology parameters when computing missing values (ie sockets - preferred over cores, which were preferred over threads), however, this - behaviour is considered liable to change. + must be specified. The specified parameters must be greater than zero, + explicit configuration like "cpus=0" is not allowed. Values for any + omitted parameters will be computed from those which are given. + Historically preference was given to the coarsest topology parameters + when computing missing values (ie sockets preferred over cores, which + were preferred over threads), however, this behaviour is considered + liable to change. Prior to 6.2 the preference was sockets over cores + over threads. Since 6.2 the preference is cores over sockets over threads. ERST DEF("numa", HAS_ARG, QEMU_OPTION_numa, |