Re: EDK2 + VT-x

[Laszlo Ersek <lersek@redhat.com>]

CC Ladi and Eduardo

On 09/14/17 02:54, Patchmail wrote:
> I cannot find anywhere how to enable VT-x in OVMF, if anyone can point me
> in the right direction, I'd greatly appreciate it.

If you are looking to do nested virt with OVMF, first of all I recommend
the following blog to your attention:

https://ladipro.wordpress.com/

I think Eduardo must have a bunch of blog posts on CPU models as well:

https://habkost.net/


Second, if you add the +vmx flag to your CPU model on the QEMU command
line, or in the libvirt domain XML, then QEMU will expose that to OVMF
in a dedicated fw_cfg file ("etc/msr_feature_control"), and OVMF will
set the Feature Control MSR accordingly, on all the CPUs in the guest.

Please refer to the following:

- TianoCore BZ <https://bugzilla.tianocore.org/show_bug.cgi?id=86>

- edk2 commit dbab994991c7 ("OvmfPkg/PlatformPei: program
  MSR_IA32_FEATURE_CONTROL from fw_cfg", 2016-07-07).


IOW, with the caveats described in Ladi's and Eduardo's blogs, just add
the +vmx flag to your CPU model, and you should be good to go.

Thanks
Laszlo