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* [Bug 109456] KVM VFIO guest X hang with guest kernel > 4.15
@ 2019-01-25 11:03 bugzilla-daemon
  2019-01-25 15:32 ` bugzilla-daemon
                   ` (8 more replies)
  0 siblings, 9 replies; 10+ messages in thread
From: bugzilla-daemon @ 2019-01-25 11:03 UTC (permalink / raw)
  To: dri-devel


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https://bugs.freedesktop.org/show_bug.cgi?id=109456

            Bug ID: 109456
           Summary: KVM VFIO guest X hang with guest kernel > 4.15
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: libgradev@gmail.com

Hi

Host: Arch running kernel 4.20.3 / Qemu 3.1
Guest: Ubuntu 18.04.1 (tried Ubuntu 18.10 also) with any kernel after 4.15
Driver: Happens with current stable, git from Padoka PPA and amdgpu-pro 18.50

Issue: Vega 64 passed through to guest causes X to hang on boot using 100% CPU
for one of the passed through cores for the Xorg process. X never starts with
the stopping point being 'LoadModule: "dri2"'. I cannot see any relevant errors
in Xorg.log or the KRB - though it's easily reproducible. The system is still
alive and can be ssh'd into.

Adding the nomodeset kernel option allows the guest to boot to GUI (albeit
without acceleration).

Details: With Qemu 3.0 having more than ~12GB RAM assigned to the guest causes
this behaviour. With Qemu 3.1 the amount of RAM is irrelevant - the hang always
occurs.

Believe this is related to one of the GPU reset patches added to the 4.16
kernel as the guest boots fine with Qemu 3.0/3.1 and guest kernel 4.15 (tested
up to 16GB guest RAM).

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^ permalink raw reply	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2019-07-29 14:17 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-01-25 11:03 [Bug 109456] KVM VFIO guest X hang with guest kernel > 4.15 bugzilla-daemon
2019-01-25 15:32 ` bugzilla-daemon
2019-04-18 14:12 ` bugzilla-daemon
2019-04-23 10:07 ` bugzilla-daemon
2019-04-23 10:11 ` bugzilla-daemon
2019-04-23 10:13 ` bugzilla-daemon
2019-06-19 11:46 ` bugzilla-daemon
2019-06-19 12:47 ` bugzilla-daemon
2019-07-29 14:16 ` bugzilla-daemon
2019-07-29 14:17 ` bugzilla-daemon

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