[vfio-users] regression from linux 4.0.4 to 4.2.0

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Just a side-note:
AFAIR -smp option ignores topology specs(sockets-cores-threads) if
abregular value is specified.
And doing cores=8 threads=2 should give you a 16 (logical) core vcpu. I'm
pretty sure that's not what you want to do. Consult qemu-system-x86_64 help
to make sure.
On Oct 1, 2015 3:26 AM, "Okky Hendriansyah" <okky at nostratech.com> wrote:

> Hi Alex,
>
> I have experienced my setup is also not working as it used to after
> upgrading from 4.1.6 to 4.2.1. After reading on the list mentioned I
> googled around and found [1].
>
> Changing my processor and memory settings from -smp
> cpus=8,cores=4,threads=2,sockets=1 -m size=16G to -smp
> cpus=4,cores=4,threads=1,sockets=1 -m size=8G resulting the VM
> successfully boots like normal. But changing to other values did not always
> succeeded. I did not now the formula so I kind of brute forcing my way. I
> think I managed to boot the VM also with -smp
> cpus=8,cores=4,threads=2,sockets=1 -m size=4G. I forgot the details.
>
> Currently I’m rolling back to 4.1.6, but if there’s something that I could
> provide to help finding out the issue, I can upgrade it and test it again.
> Please let me know.
>
> [1] https://github.com/tianocore/edk2/issues/21
>
> --
> *Okky Hendriansyah*
>
> On September 28, 2015 at 23:53:08, globalgorrilla at fastmail.fm (
> globalgorrilla at fastmail.fm) wrote:
>
> Alex,
>
> I reported this on 08/18. It's been echoed several times on this list
> since.
>
> You've said everything is working for you and you appear to have a very
> similar setup to us others (passing through devices with VFIO to QEMU
> and using OVMF).
>
> Circumstantial evidence is that there is something in > 4.1 that (often)
> breaks OVMF in QEMU.
>
> How could we dig into this? Perhaps it's not related to vfio?
>
> Regarding the MTRR patch, I had made the fix myself in the 4.2 RCs and I
> believe the patch is merged in already to 4.2 +. I don't think that is
> the culprit ...?
>
> Thoughts?
>
> On 20 Sep 2015, at 9:09, Kővágó Zoltán wrote:
>
> > Hello,
> >
> > I've been using vfio-pci to passthrough a GPU to virtual machine since
> > some time now, and it worked great. But this weekend I've finally had
> > enough time to update kernel, and things are completely broken with
> > the new kernel...
> >
> > I've been using the ACS override patch (and a quick-and-dirty fix for
> > multiple GOPs, but created a proper-ish patch yesterday, see
> > http://article.gmane.org/gmane.linux.kernel.efi/6332 ), CSM disabled
> > in UEFI and using OVMF virtual machines. The motherboard is an ASRock
> > Z87M Extreme4, with two PCI video cards (an NVidia GT640 (the primary
> > card, used for linux), for which I almost had to beg at Gigabyte
> > support to send an UEFI compatible VBIOS, and a GTX980 (secondary
> > card, to passthrough)). The integrated Intel GPU is diabled in UEFI
> > settings. I'm not sure if it's supposed to work, but with 4.0.4
> > kernels it worked like a charm.
> >
> > Now with 4.2.0, when I start qemu the monitor attached to the
> > secondary card powers down, and then nothing happens, except qemu
> > eating about 150% cpu. I've started bisecting the kernel, and found
> > out that
> >
> > d69afbc6b1b5d0579f13d1a6339d952c4f60a9f4 KVM: MMU: fix decoding cache
> > type from MTRR
> >
> > is the culprit. When mtrr is diabled, the old code returns 0xFF while
> > the new returns MTRR_TYPE_UNCACHABLE. I have absolutely no idea what
> > the hell is going on here, but changing that return statement back
> > solves the problem, until
> >
> > b18d5431acc7a2fd22767925f3a6f597aa4bd29e KVM: x86: fix CR0.CD
> > virtualization
> >
> > If I comment out the if kvm_read_cd0 part it will work.. until
> > 4e241557fc1cb560bd9e77ca1b4a9352732a5427, which is a merge commit(!).
> > I'm attaching a patch, it fixes the problem until
> > f2ae45edbca7ba5324eef01719ede0151dc5cead for me. But as I said
> > earlier I have no freakin' idea what's going on here.
> >
> > I have recompiled OVMF from svn yesterday evening, and have a
> > recent-ish qemu master (with some audio related patches). Tell me if
> > you need any more information.
> >
> > Thanks,
> > Zoltan
> >
> > [magic.patch]
> > _______________________________________________
> > vfio-users mailing list
> > vfio-users at redhat.com
> > https://www.redhat.com/mailman/listinfo/vfio-users
>
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