[libvirt] ARM KVM GICv3 Support

[Daniel P. Berrange]

On Sun, Dec 20, 2015 at 04:49:20PM +0100, Kashyap Chamarthy wrote:
> On Tue, Dec 15, 2015 at 04:42:13PM +0000, Peter Maydell wrote:
> > On 15 December 2015 at 16:35, Andrew Jones <drjones at redhat.com> wrote:
> > > This is probably good for guests that happy with both. Guests that
> > > need/want a specific choice will put their integer there, and then
> > > we need a way to do a capabilities check before launching that guest
> > > on an arbitrary host.
> > 
> > OK, so how do we typically do that? I notice I have a 'kvm-ok'
> > script on my machine which helpfully reports things like whether
> > KVM is enabled, and it seems like it might be helpful to extend
> > that to know a bit more about ARM hosts. But I'm guessing libvirt
> > doesn't use that for its capability checking ?
> 
> libvirt ships a tool called `virt-host-validate` that performs a bunch
> of checks along with whether KVM is enabled or not in the BIOS:
> 
> $ sudo virt-host-validate
>   QEMU: Checking for hardware virtualization                                 : PASS
>   QEMU: Checking for device /dev/kvm                                         : PASS
>   QEMU: Checking for device /dev/vhost-net                                   : PASS
>   QEMU: Checking for device /dev/net/tun                                     : PASS
>    LXC: Checking for Linux >= 2.6.26                                         : PASS
> 
> The only ARM machine I have access to is an AArch64 one, running on it
> results in:
> 
>   $ sudo virt-host-validate 
>     QEMU: Checking for hardware virtualization                                 : WARN (Only emulated CPUs are available, performance will be significantly limited)

This check needs to be fixed to work on Arm hosts, or indeed any
non-x86 hosts. It currently checks for 'svm' and 'vmx' flags in
CPU.


Regards,
Daniel
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