| 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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