On Wed, Feb 27, 2019 at 04:36:39PM -0800, Daniel Verkamp wrote: > Hello, > > In my testing of crosvm[1] with Linux 4.4.175, I am observing failures > on a 'kevin' Chromebook (RK3399) device - the guest kernel does not > even get to the point of printing its first messages, and the host > seems to be spinning at 100% CPU in KVM_RUN. > > I narrowed this down to the 4.4 stable backport of "arm64: KVM: Skip > MMIO insn after emulation" - with this patch reverted, I can boot the > guest kernel as normal again. > > Unfortunately, I am unable to easily test with a newer upstream kernel > (this board is using the Chrome OS kernel with many additional patches > applied on top of 4.4), so I'm not sure if this issue was introduced > in the mainline commit or only in the stable branch. Is it possible > that this patch has other dependencies that were missed in the > backport? It looks like it was part of a larger series, but only this > patch got pulled for 4.4 stable. It looks like this got pulled in by Sasha's bot which is why it was applied. I have no objection to reverting this if it is causing problems, unless someone here really thinks it needs to remain in the tree? thanks, greg k-h
