From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 109456] KVM VFIO guest X hang with guest kernel > 4.15
Date: Fri, 25 Jan 2019 11:03:28 +0000 [thread overview]
Message-ID: <bug-109456-502@http.bugs.freedesktop.org/> (raw)
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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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next reply other threads:[~2019-01-25 11:03 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-25 11:03 bugzilla-daemon [this message]
2019-01-25 15:32 ` [Bug 109456] KVM VFIO guest X hang with guest kernel > 4.15 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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