Re: Virtualization and older CPUs

[Will McDonald <wmcdonald@xxxxxxxxx>]

And... now I'm on a machine with libvirt.

From man virt-install:

>   --cpu
>       Syntax: --cpu  MODEL[,+feature][,-feature][,match=MATCH][,vendor=VEN‐
>       DOR],...

>

>       Use --cpu=? to see a list of all available sub options.  Complete de‐
>       tails at https://libvirt.org/formatdomain.html#elementsCPU

And then from that link: https://libvirt.org/formatdomain.html#cpu-model-and-topology

> model

>

> The content of the model element specifies CPU model requested by the guest. 

> The list of available CPU models and their definition can be found in directory cpu_map, 

> installed in libvirt's data directory.

Next, doing a find for cpu_map under /usr throws out /usr/share/libvirt/cpu_map, which isn't owned by any package but is full of XML filed owned by libvirt-libs:

wmcdonald@fedora:~$ ls -l /usr/share/libvirt/cpu_map/x8* | head
-rw-r--r--. 1 root root   160 Mar  1 11:19 /usr/share/libvirt/cpu_map/x86_486.xml
-rw-r--r--. 1 root root   724 Mar  1 11:19 /usr/share/libvirt/cpu_map/x86_athlon.xml
-rw-r--r--. 1 root root  1857 Mar  1 11:19 /usr/share/libvirt/cpu_map/x86_Broadwell-IBRS.xml
-rw-r--r--. 1 root root  1811 Mar  1 11:19 /usr/share/libvirt/cpu_map/x86_Broadwell-noTSX-IBRS.xml

On Tue, 23 Jul 2024 at 10:07, Will McDonald <wmcdonald@xxxxxxxxx> wrote:

This looks like if might help lead you toward an answer...

https://qemu-project.gitlab.io/qemu/system/qemu-cpu-models.html#libvirt-guest-xml

On Tue, 23 Jul 2024, 09:54 Javier Perez, <pepebuho@xxxxxxxxx> wrote:

Hi.

How can I tell virt-manager to create a VM but with a CPU of an older generation? I am trying to play an old game with wine but I keep getting crashes. Something about UMIP and SIDTs and similar stuff.

My plan is, given that my CPU is 14th generation, probably I could get away virtualizing a VM faking an older CPU without that feature.

My google-fu has not been that good, all I get is virtualizationn on old machines instead of how to virtualize an older CPU in a newer machine.

Thanks for pointing me on the right direction...

--

------------------------------
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 ~~~~     Javier Perez
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 ~~~~          toward the day...
  m m       Pepebuho watches
                from his high perch.

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