[virt-tools-list] [virt-manager PATCH 0/8] cpu related bug fixes and improvements

[Pavel Hrdina]

On Fri, Mar 15, 2019 at 06:55:20PM +0200, Hetz Ben Hamo wrote:
> Hi,
> 
> Out of curiosity, I got 2 questions:

Hi

> 1. Where does the domcapabilities are being retrieved from?

You can get it by running 'virsh domcapabilities', it has some
parameters that can change the output, look for domcapabilities
in 'man virsh'.

To extend the answer, the data are provided by libvirt and libvirt
gets the data from QEMU (libvirt >= 3.2.0 and QEMU >= 2.9.0) or from
it's own database and cpuid.

> 2. Is is possible to change some flags (in the CPU section) from 'require'
> to disable and vice versa? (i'm talking system wide, not per VM) if so, how?

No, these domcapabilities returns what is possible with specific QEMU
on specific host.  If you want to disable some features or enable them
you need to specify that for every singe VM.

My question is why would you like to change the CPU features?

Pavel
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