Hi Gerd:

Thanks for your reply. In fact, I have no choice, only QXL in my work.

1. I wonder why the device display be normal when it hung on bus=pci.8,addr=0x0, but it is abnormal when bus=pci.9,addr=0x1 or bus=pci.7,addr=0x0.

2. Why cache properties are going to cause QXL display abnormal on ARM. Are there any links or materials? Thanks.

take care

Lange


At 2021-11-02 21:35:06, "Gerd Hoffmann" <kraxel@redhat.com> wrote:
>On Tue, Nov 02, 2021 at 08:55:39PM +0800, Lange Tang wrote:
>> Hi everyone:
>> 
>> 
>> In order to support QXL display during the UEFI phase of the arm64 virtual machine,
>
>Not going to fly.  Use virtio-gpu instead.
>
>Anything with a virtual pci memory bar is going to have cache attribute
>problems on arm.
>
>take care,
>  Gerd
>
>
>
>
>