Hi,
On Fri, Feb 1, 2019 at 5:04 PM Daniel P. Berrangé <berrange@xxxxxxxxxx> wrote:
On Fri, Feb 01, 2019 at 04:56:23PM +0200, Hetz Ben Hamo wrote:
> Hi,
>
> I hope I'm asking in the right place.
>
> First question: I'm using AMD Ryzen 2700 CPU, and the VM's were running
> super slow. Checking on the net, most of the docs shows that I should look
> at lscpu output which indeed shows that my CPU has SVM. However, it took me
> a bit more time to figure out that the kvm_amd module was not loaded
> because SVM was disabled in the BIOS, so my question is: Could the VMM team
> add a simple check before starting a VM if kvm-intel or kvm_amd modules are
> loaded and if not - show a warning message to enable VT-X/SVM on the
> BIOS/UEFI please?
FWIW, virt-host-validate command line tool should report on this problem,
but of course you have to know it exists first, so wouldn't have helped
your situation.
Yes, that's the utility that helped me to diagnose the issue. My idea was thinking about an end-user who doesn't have much experience with Linux, just to notify him with a warning window to go set it in the BIOS. Just an idea ;)
> Second question: After enabling the SVM in the BIOS and restarting the VMM,
> the previously configured VM was still running super-slow. I recreated the
> VM and only the new VM was running fast, so I assume that a parameter not
> to use the SVM is written in the VM configuration? if so, where can I
> change it in the VM configuration GUI? (I thought it was related to the
> copy/mode of the CPU, which doesn't change things)
Whether to use TCG (emulation) or KVM (hardware acceleration) is in the
guest XML configuration.
Is it possible to change "TGC" in the virt-manager to "TCG (emulation)"? that could help.
I don't think its changable in the GUI.
If you use the command line tool 'virsh edit $GUESTNAME' as root you will
see
<domain type='qemu'>
....
Just change that to 'kvm' instead.
Oh, thanks!
Regards,
Daniel
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