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Description of problem:
cachetune work not well with TCG guest
Version-Release number of selected component (if applicable):
libvirt-3.9.0-11.el7.x86_64
How reproducible:
100%
Steps to Reproduce:
1. prepare a TCG guest with cachetune:
<domain type='qemu'>
<name>vm1</name>
<uuid>f98741e7-ddad-4be1-82c0-0ae3655d1c25</uuid>
<memory unit='KiB'>1024000</memory>
<currentMemory unit='KiB'>1024000</currentMemory>
<vcpu placement='static' cpuset='0-2' current='2'>4</vcpu>
<cputune>
<cachetune vcpus='0'>
<cache id='0' level='3' type='both' size='1' unit='MiB'/>
<cache id='1' level='3' type='both' size='2' unit='MiB'/>
</cachetune>
<cachetune vcpus='1'>
<cache id='0' level='3' type='both' size='2' unit='MiB'/>
<cache id='1' level='3' type='both' size='1' unit='MiB'/>
</cachetune>
<cachetune vcpus='3'>
<cache id='0' level='3' type='both' size='1' unit='MiB'/>
<cache id='1' level='3' type='both' size='1' unit='MiB'/>
</cachetune>
</cputune>
2. start guest:
# virsh start vm1
Domain vm1 started
3. check the resctrl tasks binding status, and there is no task id in these dir:
# cat /sys/fs/resctrl/qemu-5-vm1-vcpus_0/tasks
# cat /sys/fs/resctrl/qemu-5-vm1-vcpus_1/tasks
# cat /sys/fs/resctrl/qemu-5-vm1-vcpus_3/tasks
Actual results:
Libvirt create 3 dir for vcpus 0,1,3, but doesn't set the cpu thread in the tasks, and also TCG only have one thread for all cpus, libvirt cannot put each vcpu in these 3 dir
Expected results:
1. report error with machine type is qemu:
error: operation failed: Virt type 'qemu' does not support cachetune
or 2. allow put all vcpus in one group
Additional info:
Verified this bug on the following components:
qemu-kvm-rhev-2.12.0-7.el7.x86_64
libvirt-4.5.0-1.el7.x86_64
kernel-3.10.0-919.el7.x86_64
Steps:
1. Edit VM with the following configuration and try to save it
# virsh edit b1
<domain type='qemu'>
...
<cputune>
<cachetune vcpus='0'>
<cache id='0' level='3' type='both' size='1' unit='MiB'/>
<cache id='1' level='3' type='both' size='2' unit='MiB'/>
</cachetune>
<cachetune vcpus='1'>
<cache id='0' level='3' type='both' size='2' unit='MiB'/>
<cache id='1' level='3' type='both' size='1' unit='MiB'/>
</cachetune>
<cachetune vcpus='3'>
<cache id='0' level='3' type='both' size='1' unit='MiB'/>
<cache id='1' level='3' type='both' size='1' unit='MiB'/>
</cachetune>
</cputune>
...
error: unsupported configuration: cachetune is only supported for KVM domains
Failed. Try again? [y,n,i,f,?]:
The error info raised, which is expected. So move this bug to be verified.
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, 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-2018:3113
Description of problem: cachetune work not well with TCG guest Version-Release number of selected component (if applicable): libvirt-3.9.0-11.el7.x86_64 How reproducible: 100% Steps to Reproduce: 1. prepare a TCG guest with cachetune: <domain type='qemu'> <name>vm1</name> <uuid>f98741e7-ddad-4be1-82c0-0ae3655d1c25</uuid> <memory unit='KiB'>1024000</memory> <currentMemory unit='KiB'>1024000</currentMemory> <vcpu placement='static' cpuset='0-2' current='2'>4</vcpu> <cputune> <cachetune vcpus='0'> <cache id='0' level='3' type='both' size='1' unit='MiB'/> <cache id='1' level='3' type='both' size='2' unit='MiB'/> </cachetune> <cachetune vcpus='1'> <cache id='0' level='3' type='both' size='2' unit='MiB'/> <cache id='1' level='3' type='both' size='1' unit='MiB'/> </cachetune> <cachetune vcpus='3'> <cache id='0' level='3' type='both' size='1' unit='MiB'/> <cache id='1' level='3' type='both' size='1' unit='MiB'/> </cachetune> </cputune> 2. start guest: # virsh start vm1 Domain vm1 started 3. check the resctrl tasks binding status, and there is no task id in these dir: # cat /sys/fs/resctrl/qemu-5-vm1-vcpus_0/tasks # cat /sys/fs/resctrl/qemu-5-vm1-vcpus_1/tasks # cat /sys/fs/resctrl/qemu-5-vm1-vcpus_3/tasks Actual results: Libvirt create 3 dir for vcpus 0,1,3, but doesn't set the cpu thread in the tasks, and also TCG only have one thread for all cpus, libvirt cannot put each vcpu in these 3 dir Expected results: 1. report error with machine type is qemu: error: operation failed: Virt type 'qemu' does not support cachetune or 2. allow put all vcpus in one group Additional info: