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Bug 2091166 - Q35: dmidecode doesn't display number of cpus (>255) correctly
Summary: Q35: dmidecode doesn't display number of cpus (>255) correctly
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: qemu-kvm
Version: unspecified
Hardware: Unspecified
OS: Unspecified
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Julia Suvorova
QA Contact: Yiqian Wei
URL:
Whiteboard:
Depends On: 2135806
Blocks: 1788991 1906077
TreeView+ depends on / blocked
 
Reported: 2022-05-27 17:21 UTC by Julia Suvorova
Modified: 2023-05-09 07:43 UTC (History)
10 users (show)

Fixed In Version: qemu-kvm-7.2.0-1.el9
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2023-05-09 07:19:33 UTC
Type: Bug
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Issue Tracker RHELPLAN-123584 0 None None None 2022-05-27 17:30:00 UTC
Red Hat Product Errata RHSA-2023:2162 0 None None None 2023-05-09 07:20:28 UTC

Description Julia Suvorova 2022-05-27 17:21:17 UTC 
Description of problem:
SMBIOS 3.0 structure 4 doesn't pass number of cpus correctly, so dmidecode shows incorrect number in the guest.

How reproducible:
100%

Steps to Reproduce:
1. run qemu with cpu count over 255 (with SMBIOS 3.0):
  $ qemu-kvm -smp 280 -machine q35,smbios-entry-point-type=64 ...
2. run dmidecode in the guest
  # dmidecode -t 4

Actual results:

Handle 0x0400, DMI type 4, 42 bytes
Processor Information
...
	Core Count: 24
	Core Enabled: 24
	Thread Count: 1

Expected results:

Handle 0x0400, DMI type 4, 42 bytes
Processor Information
...
	Core Count: 280
	Core Enabled: 280
	Thread Count: 1
Comment 1 Julia Suvorova 2022-05-27 17:28:42 UTC 
Posted patches to upstream QEMU:

[PATCH 0/5] hw/smbios: add core_count2 to smbios table type 4
    [PATCH 1/5] hw/smbios: add core_count2 to smbios table type 4
    [PATCH 2/5] bios-tables-test: teach test to use smbios 3.0 tables
    [PATCH 3/5] tests/acpi: allow changes for core_count2 test
    [PATCH 4/5] bios-tables-test: add test for number of cores > 255
    [PATCH 5/5] tests/acpi: update tables for new core count test
Comment 2 Julia Suvorova 2022-05-27 17:31:50 UTC 
@nilal Which release do you think it should go to?
Comment 3 Nitesh Narayan Lal 2022-05-27 17:39:43 UTC 
(In reply to Julia Suvorova from comment #2)
> @nilal Which release do you think it should go to?

I would say 9.1, however, it will mainly depend on how quickly this gets picked upstream.
Comment 4 Yiqian Wei 2022-06-01 06:20:55 UTC 
Hit this bug with smbios 2.8

host version:
kernel-5.14.0-100.el9.x86_64
qemu-kvm-7.0.0-4.el9.x86_64
seabios-1.16.0-3.el9.x86_64
guest: rhel9.1.0

1.boot a guest with 280 vcpus
/usr/libexec/qemu-kvm \
    -name 'avocado-vt-vm1'  \
    -sandbox on  \
    -machine q35,memory-backend=mem-machine_mem,kernel-irqchip=split \
    -device pcie-root-port,id=pcie-root-port-0,multifunction=on,bus=pcie.0,addr=0x1,chassis=1 \
    -device pcie-pci-bridge,id=pcie-pci-bridge-0,addr=0x0,bus=pcie-root-port-0  \
    -nodefaults \
    -device VGA,bus=pcie.0,addr=0x2 \
    -m 16G \
    -object memory-backend-ram,size=16G,id=mem-machine_mem  \
    -smp 280  \
    -cpu 'SandyBridge',enforce \
    -chardev socket,server=on,wait=off,path=/tmp/monitor-qmpmonitor1-20220520-212200-9Qt88GNK,id=qmp_id_qmpmonitor1  \
    -mon chardev=qmp_id_qmpmonitor1,mode=control \
    -chardev socket,server=on,wait=off,path=/tmp/monitor-catch_monitor-20220520-212200-9Qt88GNK,id=qmp_id_catch_monitor  \
    -mon chardev=qmp_id_catch_monitor,mode=control \
    -device pvpanic,ioport=0x505,id=idr2aDG3 \
    -chardev socket,server=on,wait=off,path=/tmp/serial-serial0-20220520-212200-9Qt88GNK,id=chardev_serial0 \
    -device isa-serial,id=serial0,chardev=chardev_serial0  \
    -chardev socket,id=seabioslog_id_20220520-212200-9Qt88GNK,path=/tmp/seabios-20220520-212200-9Qt88GNK,server=on,wait=off \
    -device isa-debugcon,chardev=seabioslog_id_20220520-212200-9Qt88GNK,iobase=0x402 \
    -device pcie-root-port,id=pcie-root-port-1,port=0x1,addr=0x1.0x1,bus=pcie.0,chassis=2 \
    -device qemu-xhci,id=usb1,bus=pcie-root-port-1,addr=0x0 \
    -device usb-tablet,id=usb-tablet1,bus=usb1.0,port=1 \
    -device pcie-root-port,id=pcie-root-port-2,port=0x2,addr=0x1.0x2,bus=pcie.0,chassis=3 \
    -device virtio-scsi-pci,id=virtio_scsi_pci0,bus=pcie-root-port-2,addr=0x0 \
    -blockdev node-name=file_image1,driver=file,auto-read-only=on,discard=unmap,aio=threads,filename=/home/rhel910-64-virtio-scsi.qcow2,cache.direct=on,cache.no-flush=off \
    -blockdev node-name=drive_image1,driver=qcow2,read-only=off,cache.direct=on,cache.no-flush=off,file=file_image1 \
    -device scsi-hd,id=image1,drive=drive_image1,write-cache=on \
    -device pcie-root-port,id=pcie-root-port-3,port=0x3,addr=0x1.0x3,bus=pcie.0,chassis=4 \
    -device virtio-net-pci,mac=9a:5d:b0:f5:04:0f,id=idlokhzs,netdev=id4YbMcO,bus=pcie-root-port-3,addr=0x0  \
    -netdev tap,id=id4YbMcO,vhost=on   \
    -vnc :1  \
    -rtc base=utc,clock=host,driftfix=slew  \
    -boot menu=off,order=cdn,once=c,strict=off \
    -enable-kvm \
    -monitor stdio \
    -qmp tcp:0:4444,server=on,wait=off \

2.run dmidecode in the guest
  # dmidecode -t 4

Test results:
# dmidecode -t 4
# dmidecode 3.3
Getting SMBIOS data from sysfs.
SMBIOS 2.8 present.

Handle 0x0400, DMI type 4, 42 bytes
Processor Information
	Socket Designation: CPU 0
	Type: Central Processor
	Family: Other
	Manufacturer: Red Hat
	ID: A1 06 02 00 FF FB 8B 07
	Version: RHEL-9.0.0 PC (Q35 + ICH9, 2009)
	Voltage: Unknown
	External Clock: Unknown
	Max Speed: 2000 MHz
	Current Speed: 2000 MHz
	Status: Populated, Enabled
	Upgrade: Other
	L1 Cache Handle: Not Provided
	L2 Cache Handle: Not Provided
	L3 Cache Handle: Not Provided
	Serial Number: Not Specified
	Asset Tag: Not Specified
	Part Number: Not Specified
	Core Count: 24
	Core Enabled: 24
	Thread Count: 1
	Characteristics: None
Comment 5 John Ferlan 2022-10-16 12:38:02 UTC 
v3 posted and mostly ack'd upstream: https://lists.nongnu.org/archive/html/qemu-devel/2022-10/msg01640.html

Updating ITR=9.2 - let's try to get this into qemu-7.2 for RHEL 9.2 via rebase.
Comment 6 Julia Suvorova 2022-11-28 22:06:39 UTC 
Merged upstream:
  b22fbc5bcb tests/acpi: update tables for new core count test
  2d80b33843 bios-tables-test: add test for number of cores > 255
  159a0da5b0 tests/acpi: allow changes for core_count2 test
  33bff4a85a  bios-tables-test: teach test to use smbios 3.0 tables
  05e27d74c7 hw/smbios: add core_count2 to smbios table type 4
Comment 10 Yanan Fu 2022-12-20 09:18:20 UTC 
QE bot(pre verify): Set 'Verified:Tested,SanityOnly' as gating/tier1 test pass.
Comment 17 errata-xmlrpc 2023-05-09 07:19:33 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: qemu-kvm security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2023:2162
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