stress_boot: Fixed the issue of unequal number of vCPUs when booting vm

[yiqianwei]

ID: 2602

[yiqianwei]

Test results:
(1/1) Host_RHEL.mxx.u0.ovmf.qcow2.virtio_scsi.up.virtio_net.Guest.RHEL.xx.0.x86_64.io-github-autotest-qemu.stress_boot.q35: PASS (380.55 s)

[yiqianwei]

@yanan-fu and @jingzhao84 , Could you help to review this patch? thanks

[yanan-fu]

There are not only 1 problems about the cpu topology in this case:

1. Suggest align the vm cpu number to 2:
   vcpu_maxcpus = int(math.floor(float(vm_cpu_num) / 2) * 2)
2. Do not set smp, set the vcpu_maxcpus only, avocado-vt will adjust the topology automatically
3. If the vcpu_maxcpus=1, launch vm will failed as the default vcpu_sockets is 2, To resolve this issue, you can refer:

vcpu_sockets = 1
vcpu_cores = 1
vcpu_threads = 1

[yiqianwei]

Test results:
(1/1) Host_RHEL.m10.u0.ovmf.qcow2.virtio_scsi.up.virtio_net.Guest.RHEL.10.0.x86_64.io-github-autotest-qemu.stress_boot.q35: PASS (837.65 s)

[yiqianwei]

@yanan-fu , I have updated this patch, please check it again,thanks

[yanan-fu]

Suggest add one more checking:

if host_cpu_num <= max_vms:
    test.cancel("No enough physical cpus to pin all guests")

[yiqianwei]

test.cancel("No enough physical cpus to pin all guests")

Hi @yanan-fu , Could I modify the code as follows? thanks

if host_cpu_num <= int(params.get("max_vms")):
    test.cancel("No enough physical cpus to pin all guests")
elif vm_cpu_num == 1:
    params["vcpu_sockets"] = 1
    params["vcpu_threads"] = 1
    params["vcpu_cores"] = 1
else:
    vm_cpu_num = int(math.floor(float(vm_cpu_num) / 2) * 2)