Re: [CentOS] IOMMU and kernel
yes it exist. thanks On Fri, 2020-04-03 at 15:00 -0400, Jonathan Billings wrote: > On Fri, Apr 03, 2020 at 09:40:09PM +0300, Georgios wrote: > > Yes > > > > dmesg | grep "EFI v" > > [0.00] efi: EFI v2.70 by American Megatrends > > That's not always the best test, you should look for the existence of > /sys/firmware/efi to determine if you're using an EFI system. > > 'grubby' knows to update the configuration file for Legacy vs. UEFI. > ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IOMMU and kernel (solved?)
No Centos 8. Funny thing... i didnt find alot of info online about that problem. I was guessing other people could run to the same problem with me. Anyway. I dont know what happened either :-s Thanks On Fri, 2020-04-03 at 20:55 +0200, Simon Matter via CentOS wrote: > Hi, > > > I think i might have solve it. > > > > For some reason grub2-mkconfig doesnt work. (Have no idea why) > > Is this on CentOS 7? > > Well, yes, I remember that it didn't work for me when I installed new > servers one or two years ago, that was with CentOS 7 and they were my > first EFI installs. > > > I manage to solve it with grubby. > > > > sudo grubby --args="intel_iommu=on" --update-kernel=ALL > > > > For some reason it works. I dont know if it works if my kernel gets > > upgraded. > > I have restored the original configs after messing with grub2- > mkconfig and > only used kernel installs to further modify grub config. That way it > has > always worked for me. And I was a bis scared by the whole EFI, grub2 > and > everything around it because I felt I don't really understand how it > all > interacts in detail. > > Regards, > Simon > > ___ > CentOS mailing list > CentOS@centos.org > https://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IOMMU and kernel
On Fri, Apr 03, 2020 at 09:40:09PM +0300, Georgios wrote: > > Yes > > dmesg | grep "EFI v" > [0.00] efi: EFI v2.70 by American Megatrends That's not always the best test, you should look for the existence of /sys/firmware/efi to determine if you're using an EFI system. 'grubby' knows to update the configuration file for Legacy vs. UEFI. -- Jonathan Billings ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IOMMU and kernel (solved?)
Hi, > I think i might have solve it. > > For some reason grub2-mkconfig doesnt work. (Have no idea why) Is this on CentOS 7? Well, yes, I remember that it didn't work for me when I installed new servers one or two years ago, that was with CentOS 7 and they were my first EFI installs. > > I manage to solve it with grubby. > > sudo grubby --args="intel_iommu=on" --update-kernel=ALL > > For some reason it works. I dont know if it works if my kernel gets > upgraded. I have restored the original configs after messing with grub2-mkconfig and only used kernel installs to further modify grub config. That way it has always worked for me. And I was a bis scared by the whole EFI, grub2 and everything around it because I felt I don't really understand how it all interacts in detail. Regards, Simon ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IOMMU and kernel (solved?)
I think i might have solve it. For some reason grub2-mkconfig doesnt work. (Have no idea why) I manage to solve it with grubby. sudo grubby --args="intel_iommu=on" --update-kernel=ALL For some reason it works. I dont know if it works if my kernel gets upgraded. ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IOMMU and kernel
Yes dmesg | grep "EFI v" [0.00] 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? > ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IOMMU and kernel
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? -- Jonathan Billings ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IOMMU and kernel
Yes i can find intel_iommu=on. For some reason it doesnt take it when i reboot. On Fri, 2020-04-03 at 18:44 +0200, Simon Matter via CentOS 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 you look at /boot/efi/EFI/centos/grub.cfg, do you see that the > parameter has been added? > > Regards, > Simon > > ___ > CentOS mailing list > CentOS@centos.org > https://lists.centos.org/mailman/listinfo/centos ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
Re: [CentOS] IOMMU and kernel
> 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 you look at /boot/efi/EFI/centos/grub.cfg, do you see that the parameter has been added? Regards, Simon ___ CentOS mailing list CentOS@centos.org https://lists.centos.org/mailman/listinfo/centos
