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+ppc64 tcg guests get incorrect Capacity Entitlement values from SMP spapr machine's RTAS - examples given from AIX guest OS
+Description of problem:
+Entitled Capacity of the guest OS is not equal to the number of vCPUs you configure with QEMU.
+
+It only gives you 1/4 entitlements to your configured capacity, and if you increase the number of processors, it converts the LPAR capacity to hundredths of a core, throttling guest performance.
+Steps to reproduce:
+Definition of terms from lparstat:
+Entitled Capacity: The number of processing units this LPAR is entitled to receive.
+Maximum Capacity: The maximum number of processing units this LPAR was defined to ever have. Entitled capacity can be increased up to this value.
+
+Some examples:
+
+1 QEMU vCPU:
+Entitled Capacity: 0.25
+Maximum Capacity: 1.00
+
+2 QEMU vCPUs (-smp cpus=2,sockets=1,cores=2,threads=1):
+Entitled Capacity = 0.50
+Maximum Capacity: 0.02
+
+3 QEMU CPUs (-smp cpus=3,sockets=1,cores=3,threads=1):
+Entitled Capacity = 0.75
+Maximum Capacity: 0.03
+
+4 QEMU CPUs (-smp cpus=4,sockets=1,cores=4,threads=1):
+Entitled Capacity = 1.00
+Maximum Capacity: 0.04
+
+I believe these Entitled and Maximum values are comming from the spapr machine's MaxEntCap, DesProcs and MaxPlatProcs settings which get affected by -smp passed to QEMU.
+Additional information:
+Details:
+
+1 QEMU vCPU:
+   ```
+kens@aix-ppc64$ lparstat -i | head -20
+Node Name                                  : aix-ppc64
+Partition Name                             : IBM AIX - IBM POWER9
+Partition Number                           : 0
+Type                                       : Shared
+Mode                                       : Capped
+Entitled Capacity                          : 0.25
+Partition Group-ID                         : 1
+Shared Pool ID                             : 1
+Online Virtual CPUs                        : 1
+Maximum Virtual CPUs                       : 1
+Minimum Virtual CPUs                       : 1
+Online Memory                              : 8192 MB
+Maximum Memory                             : 8192 MB
+Minimum Memory                             : 8192 MB
+Variable Capacity Weight                   : 128
+Minimum Capacity                           : 0.01
+Maximum Capacity                           : 1.00
+Capacity Increment                         : 1.00
+Maximum Physical CPUs in system            : 1
+Active Physical CPUs in system             : 1
+   ```
+2 QEMU vCPUs:
+   ```
+kens@aix-ppc64$ lparstat -i | head -20
+Node Name                                  : aix-ppc64
+Partition Name                             : IBM AIX - IBM POWER9
+Partition Number                           : 0
+Type                                       : Shared
+Mode                                       : Capped
+Entitled Capacity                          : 0.50
+Partition Group-ID                         : 1
+Shared Pool ID                             : 1
+Online Virtual CPUs                        : 2
+Maximum Virtual CPUs                       : 2
+Minimum Virtual CPUs                       : 2
+Online Memory                              : 8192 MB
+Maximum Memory                             : 8192 MB
+Minimum Memory                             : 8192 MB
+Variable Capacity Weight                   : 128
+Minimum Capacity                           : 0.02
+Maximum Capacity                           : 0.02
+Capacity Increment                         : 1.00
+Maximum Physical CPUs in system            : 2
+Active Physical CPUs in system             : 2
+   ```
+3 QEMU vCPUs:
+   ```
+kens@aix-ppc64$ lparstat -i | head -20
+Node Name                                  : aix-ppc64
+Partition Name                             : IBM AIX - IBM POWER9
+Partition Number                           : 0
+Type                                       : Shared
+Mode                                       : Capped
+Entitled Capacity                          : 0.75
+Partition Group-ID                         : 1
+Shared Pool ID                             : 1
+Online Virtual CPUs                        : 3
+Maximum Virtual CPUs                       : 3
+Minimum Virtual CPUs                       : 3
+Online Memory                              : 8192 MB
+Maximum Memory                             : 8192 MB
+Minimum Memory                             : 8192 MB
+Variable Capacity Weight                   : 128
+Minimum Capacity                           : 0.03
+Maximum Capacity                           : 0.03
+Capacity Increment                         : 1.00
+Maximum Physical CPUs in system            : 3
+Active Physical CPUs in system             : 3
+   ```
+4 QEMU vCPUs:
+   ```
+kens@aix-ppc64$ lparstat -i | head -2
+lparstat -i | head -2
+Node Name                                  : aix-ppc64
+Partition Name                             : IBM AIX - IBM POWER9
+kens@aix-ppc64$ lparstat -i | head -20
+lparstat -i | head -20
+Node Name                                  : aix-ppc64
+Partition Name                             : IBM AIX - IBM POWER9
+Partition Number                           : 0
+Type                                       : Shared
+Mode                                       : Capped
+Entitled Capacity                          : 1.00
+Partition Group-ID                         : 1
+Shared Pool ID                             : 1
+Online Virtual CPUs                        : 4
+Maximum Virtual CPUs                       : 4
+Minimum Virtual CPUs                       : 4
+Online Memory                              : 8192 MB
+Maximum Memory                             : 8192 MB
+Minimum Memory                             : 8192 MB
+Variable Capacity Weight                   : 128
+Minimum Capacity                           : 0.04
+Maximum Capacity                           : 0.04
+Capacity Increment                         : 1.00
+Maximum Physical CPUs in system            : 4
+Active Physical CPUs in system             : 4
+   ```
+So it seems to me like the OS assumes the following from the spapr machine settings:
+Entitled Capacity = cpus / 4 (OS is assuming smt=4 threads maybe, see below)
+Maximim Capacity = cpus / 100 (OS is assuming hundredths of a core, even though the Capacity Increment is 1.00, see below))
+
+On a real Power system (POWER8, smt=8), it looks like this:
+   ```
+kens@aix72$ lparstat -i | head -20
+Node Name                                  : aix72
+Partition Name                             : n1
+Partition Number                           : 1
+Type                                       : Shared-SMT-4
+Mode                                       : Uncapped
+Entitled Capacity                          : 6.00
+Partition Group-ID                         : 32784
+Shared Pool ID                             : 0
+Online Virtual CPUs                        : 12
+Maximum Virtual CPUs                       : 28
+Minimum Virtual CPUs                       : 1
+Online Memory                              : 131072 MB
+Maximum Memory                             : 196608 MB
+Minimum Memory                             : 1024 MB
+Variable Capacity Weight                   : 128
+Minimum Capacity                           : 0.50
+Maximum Capacity                           : 14.00
+Capacity Increment                         : 0.01
+Maximum Physical CPUs in system            : 80
+Active Physical CPUs in system             : 80
+   ```