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Chegu Vinod authored
The -numa option to qemu is used to create [fake] numa nodes and expose them to the guest OS instance. There are a couple of issues with the -numa option: a) Max VCPU's that can be specified for a guest while using the qemu's -numa option is 64. Due to a typecasting issue when the number of VCPUs is > 32 the VCPUs don't show up under the specified [fake] numa nodes. b) KVM currently has support for 160VCPUs per guest. The qemu's -numa option has only support for upto 64VCPUs per guest. This patch addresses these two issues. Below are examples of (a) and (b) a) >32 VCPUs are specified with the -numa option: /usr/local/bin/qemu-system-x86_64 \ -enable-kvm \ 71:01:01 \ -net tap,ifname=tap0,script=no,downscript=no \ -vnc :4 ... Upstream qemu : -------------- QEMU 1.1.50 monitor - type 'help' for more information (qemu) info numa 6 nodes node 0 cpus: 0 1 2 3 4 5 6 7 8 9 32 33 34 35 36 37 38 39 40 41 node 0 size: 131072 MB node 1 cpus: 10 11 12 13 14 15 16 17 18 19 42 43 44 45 46 47 48 49 50 51 node 1 size: 131072 MB node 2 cpus: 20 21 22 23 24 25 26 27 28 29 52 53 54 55 56 57 58 59 node 2 size: 131072 MB node 3 cpus: 30 node 3 size: 131072 MB node 4 cpus: node 4 size: 131072 MB node 5 cpus: 31 node 5 size: 131072 MB With the patch applied : ----------------------- QEMU 1.1.50 monitor - type 'help' for more information (qemu) info numa 6 nodes node 0 cpus: 0 1 2 3 4 5 6 7 8 9 node 0 size: 131072 MB node 1 cpus: 10 11 12 13 14 15 16 17 18 19 node 1 size: 131072 MB node 2 cpus: 20 21 22 23 24 25 26 27 28 29 node 2 size: 131072 MB node 3 cpus: 30 31 32 33 34 35 36 37 38 39 node 3 size: 131072 MB node 4 cpus: 40 41 42 43 44 45 46 47 48 49 node 4 size: 131072 MB node 5 cpus: 50 51 52 53 54 55 56 57 58 59 node 5 size: 131072 MB b) >64 VCPUs specified with -numa option: /usr/local/bin/qemu-system-x86_64 \ -enable-kvm \ -cpu Westmere,+rdtscp,+pdpe1gb,+dca,+pdcm,+xtpr,+tm2,+est,+smx,+vmx,+ds_cpl,+monitor,+dtes64,+pclmuldq,+pbe,+tm,+ht,+ss,+acpi,+d-vnc :4 ... Upstream qemu : -------------- only 63 CPUs in NUMA mode supported. only 64 CPUs in NUMA mode supported. QEMU 1.1.50 monitor - type 'help' for more information (qemu) info numa 8 nodes node 0 cpus: 6 7 8 9 38 39 40 41 70 71 72 73 node 0 size: 65536 MB node 1 cpus: 10 11 12 13 14 15 16 17 18 19 42 43 44 45 46 47 48 49 50 51 74 75 76 77 78 79 node 1 size: 65536 MB node 2 cpus: 20 21 22 23 24 25 26 27 28 29 52 53 54 55 56 57 58 59 60 61 node 2 size: 65536 MB node 3 cpus: 30 62 node 3 size: 65536 MB node 4 cpus: node 4 size: 65536 MB node 5 cpus: node 5 size: 65536 MB node 6 cpus: 31 63 node 6 size: 65536 MB node 7 cpus: 0 1 2 3 4 5 32 33 34 35 36 37 64 65 66 67 68 69 node 7 size: 65536 MB With the patch applied : ----------------------- QEMU 1.1.50 monitor - type 'help' for more information (qemu) info numa 8 nodes node 0 cpus: 0 1 2 3 4 5 6 7 8 9 node 0 size: 65536 MB node 1 cpus: 10 11 12 13 14 15 16 17 18 19 node 1 size: 65536 MB node 2 cpus: 20 21 22 23 24 25 26 27 28 29 node 2 size: 65536 MB node 3 cpus: 30 31 32 33 34 35 36 37 38 39 node 3 size: 65536 MB node 4 cpus: 40 41 42 43 44 45 46 47 48 49 node 4 size: 65536 MB node 5 cpus: 50 51 52 53 54 55 56 57 58 59 node 5 size: 65536 MB node 6 cpus: 60 61 62 63 64 65 66 67 68 69 node 6 size: 65536 MB node 7 cpus: 70 71 72 73 74 75 76 77 78 79 Signed-off-by:
Chegu Vinod <chegu_vinod@hp.com>, Jim Hull <jim.hull@hp.com>, Craig Hada <craig.hada@hp.com> Tested-by:
ee785fed