[virt-tools-list] [virt-tool-list][PATCH]virt-manager: use host CPU configuration when creating new VM

Cole Robinson crobinso at redhat.com
Wed Nov 20 19:26:49 UTC 2013

On 11/20/2013 04:22 AM, Chen Hanxiao wrote:
>> -----Original Message-----
>> From: Cole Robinson [mailto:crobinso at redhat.com]
>> Sent: Tuesday, November 19, 2013 9:23 PM
>> To: Giuseppe Scrivano; Chen Hanxiao
>> Cc: virt-tools-list at redhat.com
>> Subject: Re: [virt-tools-list] [virt-tool-list][PATCH]virt-manager: use
> host CPU
>> configuration when creating new VM
>> On 11/19/2013 07:52 AM, Giuseppe Scrivano wrote:
>>> Chen Hanxiao <chenhanxiao at cn.fujitsu.com> writes:
>>>> From: Chen Hanxiao <chenhanxiao at cn.fujitsu.com>
>>>> This patch will use host CPU configuration automatically
>>>> when creating new VM.
>>> on what version of virt-manager is your patch based?  I tried to apply
>>> it to the current git master branch[1] but I get a conflict.
>>> In addition, I am not sure what is the impact of such a change, what are
>>> for example the downsides for a migration if we default to a more
>>> restrictive CPU configuration.
>> Indeed, just doing this unconditionally is not an option.
>> I will be working on this within the next few weeks. My plan is to add an
>> option 'Default CPU for New VMs' to the Preferences dialog. There will be
> 3
>> options:
> How about add this on vmm-create.ui: tab Memory?

No, the CPU choice is sufficiently complex and has many caveats that sticking
it in the 'New VM' wizard is just going to cause more user confusion. And I
don't forsee people wanting to enter a different value for each new VM, they
likely want just one value used for all VMs, but that particular value may
vary user to user.

>> 1) hypervisor default (no <cpu> block)
>> 2) copy just the detected CPU model (so pentium3, Opteron_G4, etc)
> use baselineCPU()?
>> 3) full <cpu> copy (so either what this patch suggests, or use host-model
> use copy_host_cpu()?

Basically, yes.

- Cole

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