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Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA
From: |
Laszlo Ersek |
Subject: |
Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA |
Date: |
Tue, 21 Jul 2015 14:48:01 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 |
On 07/21/15 14:08, Alexander Graf wrote:
> On 07/20/15 21:06, Laszlo Ersek wrote:
>> Cc'ing Alex
>>
>> On 07/13/15 12:15, Paolo Bonzini wrote:
>>>
>>> On 13/07/2015 09:32, Gerd Hoffmann wrote:
>>>>> and virtio-vga is only compiled on 64-bit Intel?
>>>> There is virtio-gpu-pci ...
>>>>
>>>> Any specific reason why we need vga compatibility on !x86?
>>> I was actually thinking about 32-bit x86. :) I agree that !x86 is not
>>> necessary.
>> I disagree :)
>>
>> (This is actually my more important followup to this thread; the other
>> message I just couldn't resist sending.)
>>
>> Gerd recently contributed virtio-vga support to OvmfPkg/QemuVideoDxe:
>>
>> https://github.com/tianocore/edk2/commit/94210dc9
>>
>> That support depends on vga compat. All fine.
>>
>> What's probably not obvious is that I had ported
>> PcAtChipsetPkg/PciHostBridgeDxe to ArmVirtPkg -- which drives Alex's
>> generic PCIe host bridge, exposed on qemu-system-(arm|aarch64) -M virt
>> -- and included OvmfPkg/QemuVideoDxe in the ArmVirtQemu.dsc build too.
>>
>> That means you can currently stick a -device VGA into -M virt, and it
>> will work. Since OvmfPkg/QemuVideoDxe recognizes virtio-vga (see edk2
>
> For some definition of work, yes :). It will work perfectly fine with
> TCG, you will run into cache coherency problems with KVM because the
> guest maps MMIO regions (like the vram) as uncached while QEMU accesses
> it as cached.
Yes, I'm aware, I just didn't want to drag that thread into this
discusson as well ;)
>
>> 94210dc9 again), and the driver is included by ArmVirtQemu.dsc, I think
>> it would be probably useful to build the device model for arm/aarch64
>> targets too.
>>
>> See also QEMU commit 332261de2b (together with its parent commits).
>
> I agree. Also, as far as I understood Marc, his hope was that the fix to
> halfway working VGA emulation would be virtio-gpu.
Not sure how (if!) we're going to be able to drive that from the
firmware! :)
Thanks
Laszlo
- [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Paolo Bonzini, 2015/07/11
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Gerd Hoffmann, 2015/07/13
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Laszlo Ersek, 2015/07/20
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Alexander Graf, 2015/07/21
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA,
Laszlo Ersek <=
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Marc Zyngier, 2015/07/21
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Gerd Hoffmann, 2015/07/25
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Laszlo Ersek, 2015/07/26
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Peter Maydell, 2015/07/26
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Peter Maydell, 2015/07/26
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Laszlo Ersek, 2015/07/26
- Re: [Qemu-devel] selecting VIRTIO_INPUT and VIRTIO_VGA, Marc Zyngier, 2015/07/27