[CentOS] IOMMU and kernel

Fri Apr 3 18:40:09 UTC 2020
Georgios <gpdsbe+centos at mailbox.org>

Yes 

dmesg | grep "EFI v"
[    0.000000] efi: EFI v2.70 by American Megatrends


On Fri, 2020-04-03 at 14:29 -0400, Jonathan Billings wrote:
> On Fri, Apr 03, 2020 at 07:37:10PM +0300, Georgios wrote:
> > Hi.
> > Im trying to set intel_iommu=on on kernel parameters at grub but
> > for
> > some reason it doesnt work.
> > 
> > I edit /etc/default/grub file and i add the parameter.
> > 
> > then i run grub2-mkconfig -o /boot/efi/EFI/centos/grub.cfg and then
> > i
> > reboot.
> > 
> > when i run virt-host-validate i get 
> > 
> > QEMU: Checking if IOMMU is enabled by kernel: WARN (IOMMU appears
> > to be
> > disabled in kernel. Add intel_iommu=on to kernel cmdline arguments)
> > 
> > when i edit the grub menu durring boot and i put intel_iommu=on and
> > the
> > i run again virt-host-validate i get
> > 
> > QEMU: Checking if IOMMU is enabled by kernel: PASS
> > 
> > 
> > any ideas?
> 
> This is a libvirtd KVM machine?  Are you sure you're using UEFI?
>