On 28/02/2019 08:49, Marc Zyngier wrote:
> On Thu, 28 Feb 2019 08:16:05 +0000,
> Greg KH <[email protected]> wrote:
>
> Hi both,
>
>>
>> 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.
>
> Thanks for reporting this. I'll have a look ASAP.
>
>> 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?
>
> Can we hold on a tiny bit so that I can verify we haven't regressed
> crosvm all the way into mainline?
>
> Daniel, is there any chance you could test with kvmtool as well on
> your setup? You can easily compile it as a static binary and run it
> from ChromeOS with:
>
> lkvm-static run -c 1 -p "earlycon=uart,mmio,0x3f8" -l Image
>
> which should start a UP guest and drop you to a shell. In the
> meantime, I'm starting to build crosvm on my kevin running mainline.
OK, that wasn't a fun experience. Some build instructions for the mere
mortals (aka non-ChromeOS people) would be nice (and a mention that
crosvm cannot yet deal with GICv3-only systems...)
Anyway, I've got enough of it working that I can boot a trivial Debian
guest on kevin running 5.0-rc7, so I'm pretty confident that mainline is
OK. I'll move back to 4.4, and try to understand what happens there.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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