<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [KVM][GVT-d] [BDW & SKL ]Ubuntu 16.04 guest boot up with GPU Hang with drm-intel kernel" href="https://bugs.freedesktop.org/show_bug.cgi?id=99028#c24">Comment # 24</a> on <a class="bz_bug_link bz_status_REOPENED " title="REOPENED - [KVM][GVT-d] [BDW & SKL ]Ubuntu 16.04 guest boot up with GPU Hang with drm-intel kernel" href="https://bugs.freedesktop.org/show_bug.cgi?id=99028">bug 99028</a> from <a class="email" href="mailto:xiong.y.zhang@intel.com" title="XiongZhang <xiong.y.zhang@intel.com>"> XiongZhang</a> <pre>I did the git bisect again, and the target commit is: commit c58b735fc762e891481e92af7124b85cb0a51fce Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Date: Thu Aug 18 17:16:57 2016 +0100 drm/i915: Allocate rings from stolen If we have stolen available, make use of it for ringbuffer allocation. Previously this was restricted to !llc platforms, as writing to stolen requires a GGTT mapping - but now that we have partial mappable support, the mappable aperture isn't quite so precious so we can use it more freely and ringbuffers are a good user for the otherwise wasted stolen. Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>> Reviewed-by: Joonas Lahtinen <<a href="mailto:joonas.lahtinen@linux.intel.com">joonas.lahtinen@linux.intel.com</a>> After reverting this patch from drm-intel-nightly, I didn't see gpu hang during boot process. So we could confirm this issue is caused by i915 access stolen memory when i915 is as kvm guest where kvm doesn't supply ept and guest domain iommu mapping for stolen memory.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the assignee for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>