[Bug] virtio-gpu broken with qemu/kvm on arm64 on kernel 5.5+

[Guillaume Gardet]

Hi,

> -----Original Message-----
> From: Gerd Hoffmann <kraxel at redhat.com>
> Sent: 26 February 2020 07:46
> To: Guillaume Gardet <Guillaume.Gardet at arm.com>
> Cc: Gurchetan Singh <gurchetansingh at chromium.org>; dri-
> devel at lists.freedesktop.org; Daniel Vetter <daniel.vetter at ffwll.ch>; Catalin
> Marinas <Catalin.Marinas at arm.com>; nd <nd at arm.com>; Chia-I Wu
> <olvaffe at gmail.com>
> Subject: Re: [Bug] virtio-gpu broken with qemu/kvm on arm64 on kernel 5.5+
> 
>   Hi,
> 
> > > Perhaps try the entire series?
> > >
> > > https://patchwork.kernel.org/cover/11300619/
> 
> Latest version is at:
>    https://git.kraxel.org/cgit/linux/log/?h=drm-virtio-no-wc
> 
> > Applied entire series on top of 5.5.6, but still the same problem.
> 
> Can you double-check?  Cherry-picking the shmem + virtio patches ...
> 
>   694c824491f1 drm/shmem: add support for per object caching flags.
>   3f4d10f853fb drm/virtio: fix mmap page attributes
> 
> ... into 5.6-rc3 fixes the corruption for me.

I tried those 2 patches on top of kernel 5.6-rc3 and they indeed fix the problem.

I applied them on top of 5.5.6 and they also fix the problem!
Could we get those 2 patches applied to stable 5.5, please?

Thanks,
Guillaume

> 
> cheers,
>   Gerd