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Re: [vfio-users] Newbie steps



On Sat, 2017-03-11 at 17:47 +0000, Patrick O'Callaghan wrote:
> On Sat, 2017-03-11 at 18:37 +0100, Torbjorn Jansson wrote:
> > > So IOMMU group 1 contains my Nvidia GPU and audio, plus the PCIe
> root
> > > bridge.
> > > 
> > > $ cat /etc/modprobe.d/local.conf
> > > options vfio-pci
> ids=10de:ffffffff:ffffffff:ffffffff:00030000:ffff00ff,10de:ffffffff:f
> fffffff:ffffffff:00040300:ffffffff
> > > 
> > > (this is just cut-and-paste from Alex's blog. I've no idea what
> any of
> > > the magic hex numbers mean except for the 10de of course).
> > > 
> > > $ cat /etc/dracut.conf.d/local.conf
> > > add_drivers+="vfio vfio_iommu_type1 vfio_pci vfio_virqfd"
> > > 
> > > My boot line is:
> > > 
> > > GRUB_CMDLINE_LINUX="rd.blacklist=nvidia rd.blacklist=nouveau
> intel_iommu=on iommu=pt rd.driver.pre=vfio-pci
> vconsole.font=latarcyrheb-sun16 $([ -x /usr/sbin/rhcrashkernel-param
> ] && /usr/sbin/rhcrashkernel-param || :) rhgb quiet resume=U
> > > UID=1431e6d2-531e-46cd-8633-1cf878c6b2a1" audit=0
> > > 
> > > (Note that I have the Nvidia proprietary driver so need to mask
> that as
> > > well as Nouveau).
> > > 
> > > My monitor is connected to HDMI on the internal GPU and DVI on
> the
> > > Nvidia card.
> > > 
> > > However on rebooting I always have the Nvidia module loaded, and
> don't
> > > have vfio:
> > > $ lsmod|egrep -i nvidia\|vfio
> > > nvidia_drm             53248  1
> > > nvidia_modeset        806912  8 nvidia_drm
> > > nvidia              12267520  175 nvidia_modeset
> > > drm_kms_helper        151552  1 nvidia_drm
> > > drm                   339968  4 nvidia_drm,drm_kms_helper
> > > 
> > > And of course, the monitor is only active on the DVI port and not
> the HDMI.
> > > 
> > > Any suggestions on what I might try?
> > > 
> > > poc
> > > 
> > 
> > looks ok, did you remember to regenerate grub config?
> > if not, then your changes in /etc/default/grub did not take effect.
> > 
> > if i'm not mistaken you run: grub2-mkconfig -o grub.cfg
> > check it first before replacing old file under /boot and make a
> backup 
> > of it first in case you screw up.
> 
> Yes, I did that (on Fedora it's: grub2-mkconfig -o /etc/grub2.cfg). I

Please check whether there is also a grub.cfg or grub2.cfg in
/boot/grub/ (and it contains your changes). See also https://docs.fedor
aproject.org/en-US/Fedora/23/html/Multiboot_Guide/GRUB-
configuration.html Maybe this has changed, but it would explain why you
do not see effects from your changes. Apologies in advance if my
information is no longer correct.

> do have a backup. If it looks right, there must be something else I'm
> missing. I've wondered if having the Nvidia drivers installed could
> affect things, though I don't see why it should be necessary as long
> as
> I can stop them being loaded. I keep them updated using akmod but
> even 
> uninstalling akmod and the kmod-nvidia rpm it generates doesn't make
> any difference, i.e. somehow the modules are still there, which is
> weird in in itself. Maybe that's the root of the problem.
> 
> poc
> 
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