| H A D | machine.c | 83bcae98 Thu Oct 27 10:00:30 GMT 2022 Brice Goglin <Brice.Goglin@inria.fr> hmat acpi: Don't require initiator value in -numa
The "Memory Proximity Domain Attributes" structure of the ACPI HMAT
has a "Processor Proximity Domain Valid" flag that is currently
always set because Qemu -numa requires an initiator=X value
when hmat=on. Unsetting this flag allows to create more complex
memory topologies by having multiple best initiators for a single
memory target.
This patch allows -numa without initiator=X when hmat=on by keeping
the default value MAX_NODES in numa_state->nodes[i].initiator.
All places reading numa_state->nodes[i].initiator already check
whether it's different from MAX_NODES before using it.
Tested with
qemu-system-x86_64 -accel kvm \
-machine pc,hmat=on \
-drive if=pflash,format=raw,file=./OVMF.fd \
-drive media=disk,format=qcow2,file=efi.qcow2 \
-smp 4 \
-m 3G \
-object memory-backend-ram,size=1G,id=ram0 \
-object memory-backend-ram,size=1G,id=ram1 \
-object memory-backend-ram,size=1G,id=ram2 \
-numa node,nodeid=0,memdev=ram0,cpus=0-1 \
-numa node,nodeid=1,memdev=ram1,cpus=2-3 \
-numa node,nodeid=2,memdev=ram2 \
-numa hmat-lb,initiator=0,target=0,hierarchy=memory,data-type=access-latency,latency=10 \
-numa hmat-lb,initiator=0,target=0,hierarchy=memory,data-type=access-bandwidth,bandwidth=10485760 \
-numa hmat-lb,initiator=0,target=1,hierarchy=memory,data-type=access-latency,latency=20 \
-numa hmat-lb,initiator=0,target=1,hierarchy=memory,data-type=access-bandwidth,bandwidth=5242880 \
-numa hmat-lb,initiator=0,target=2,hierarchy=memory,data-type=access-latency,latency=30 \
-numa hmat-lb,initiator=0,target=2,hierarchy=memory,data-type=access-bandwidth,bandwidth=1048576 \
-numa hmat-lb,initiator=1,target=0,hierarchy=memory,data-type=access-latency,latency=20 \
-numa hmat-lb,initiator=1,target=0,hierarchy=memory,data-type=access-bandwidth,bandwidth=5242880 \
-numa hmat-lb,initiator=1,target=1,hierarchy=memory,data-type=access-latency,latency=10 \
-numa hmat-lb,initiator=1,target=1,hierarchy=memory,data-type=access-bandwidth,bandwidth=10485760 \
-numa hmat-lb,initiator=1,target=2,hierarchy=memory,data-type=access-latency,latency=30 \
-numa hmat-lb,initiator=1,target=2,hierarchy=memory,data-type=access-bandwidth,bandwidth=1048576
which reports NUMA node2 at same distance from both node0 and node1 as seen in lstopo:
Machine (2966MB total) + Package P#0
NUMANode P#2 (979MB)
Group0
NUMANode P#0 (980MB)
Core P#0 + PU P#0
Core P#1 + PU P#1
Group0
NUMANode P#1 (1007MB)
Core P#2 + PU P#2
Core P#3 + PU P#3
Before this patch, we had to add ",initiator=X" to "-numa node,nodeid=2,memdev=ram2".
The lstopo output difference between initiator=1 and no initiator is:
@@ -1,10 +1,10 @@
Machine (2966MB total) + Package P#0
+ NUMANode P#2 (979MB)
Group0
NUMANode P#0 (980MB)
Core P#0 + PU P#0
Core P#1 + PU P#1
Group0
NUMANode P#1 (1007MB)
- NUMANode P#2 (979MB)
Core P#2 + PU P#2
Core P#3 + PU P#3
Corresponding changes in the HMAT MPDA structure:
@@ -49,10 +49,10 @@
[078h 0120 2] Structure Type : 0000 [Memory Proximity Domain Attributes]
[07Ah 0122 2] Reserved : 0000
[07Ch 0124 4] Length : 00000028
-[080h 0128 2] Flags (decoded below) : 0001
- Processor Proximity Domain Valid : 1
+[080h 0128 2] Flags (decoded below) : 0000
+ Processor Proximity Domain Valid : 0
[082h 0130 2] Reserved1 : 0000
-[084h 0132 4] Attached Initiator Proximity Domain : 00000001
+[084h 0132 4] Attached Initiator Proximity Domain : 00000080
[088h 0136 4] Memory Proximity Domain : 00000002
[08Ch 0140 4] Reserved2 : 00000000
[090h 0144 8] Reserved3 : 0000000000000000
Final HMAT SLLB structures:
[0A0h 0160 2] Structure Type : 0001 [System Locality Latency and Bandwidth Information]
[0A2h 0162 2] Reserved : 0000
[0A4h 0164 4] Length : 00000040
[0A8h 0168 1] Flags (decoded below) : 00
Memory Hierarchy : 0
[0A9h 0169 1] Data Type : 00
[0AAh 0170 2] Reserved1 : 0000
[0ACh 0172 4] Initiator Proximity Domains # : 00000002
[0B0h 0176 4] Target Proximity Domains # : 00000003
[0B4h 0180 4] Reserved2 : 00000000
[0B8h 0184 8] Entry Base Unit : 0000000000002710
[0C0h 0192 4] Initiator Proximity Domain List : 00000000
[0C4h 0196 4] Initiator Proximity Domain List : 00000001
[0C8h 0200 4] Target Proximity Domain List : 00000000
[0CCh 0204 4] Target Proximity Domain List : 00000001
[0D0h 0208 4] Target Proximity Domain List : 00000002
[0D4h 0212 2] Entry : 0001
[0D6h 0214 2] Entry : 0002
[0D8h 0216 2] Entry : 0003
[0DAh 0218 2] Entry : 0002
[0DCh 0220 2] Entry : 0001
[0DEh 0222 2] Entry : 0003
[0E0h 0224 2] Structure Type : 0001 [System Locality Latency and Bandwidth Information]
[0E2h 0226 2] Reserved : 0000
[0E4h 0228 4] Length : 00000040
[0E8h 0232 1] Flags (decoded below) : 00
Memory Hierarchy : 0
[0E9h 0233 1] Data Type : 03
[0EAh 0234 2] Reserved1 : 0000
[0ECh 0236 4] Initiator Proximity Domains # : 00000002
[0F0h 0240 4] Target Proximity Domains # : 00000003
[0F4h 0244 4] Reserved2 : 00000000
[0F8h 0248 8] Entry Base Unit : 0000000000000001
[100h 0256 4] Initiator Proximity Domain List : 00000000
[104h 0260 4] Initiator Proximity Domain List : 00000001
[108h 0264 4] Target Proximity Domain List : 00000000
[10Ch 0268 4] Target Proximity Domain List : 00000001
[110h 0272 4] Target Proximity Domain List : 00000002
[114h 0276 2] Entry : 000A
[116h 0278 2] Entry : 0005
[118h 0280 2] Entry : 0001
[11Ah 0282 2] Entry : 0005
[11Ch 0284 2] Entry : 000A
[11Eh 0286 2] Entry : 0001
Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>
Signed-off-by: Hesham Almatary <hesham.almatary@huawei.com>
Reviewed-by: Jingqi Liu <jingqi.liu@intel.com>
Message-Id: <20221027100037.251-2-hesham.almatary@huawei.com>
Tested-by: Yicong Yang <yangyicong@hisilicon.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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