[virglrenderer-devel] GL_ARB_buffer_storage implementation

[Frank Yang]

FWIW, if Elie or anyone else is still interested, I've just gotten resource
blob working in QEMU via

https://android-review.googlesource.com/c/platform/external/qemu/+/1382077

On Wed, May 13, 2020 at 10:41 PM Frank Yang <lfy at google.com> wrote:

> Thanks Gerd, that's very helpful!
>
> Recently I've had a reason to get Vk to work with a non cpu accelerated
> guest and your steps were pretty much all there was to it (couldn't
> directly use the hypervisor's mapping apis w/ tcg, so the 'runtime user
> controlled backings' part needed to use your method:
> https://android-review.googlesource.com/c/platform/external/qemu/+/1310349
> )
>
> On Tue, May 12, 2020 at 3:41 AM Gerd Hoffmann <kraxel at redhat.com> wrote:
>
>>   Hi,
>>
>> > I was taking a look at QEMU and it's non-obvious to me how to implement
>> > RESOURCE_MAP / RESOURCE_UNMAP.
>> >
>> > For GL_ARB_buffer_storage, virglrenderer can provide a page-aligned
>> > address (seems to work even on Nvidia) for use with KVM:
>> >
>> >
>> https://gitlab.freedesktop.org/virgl/virglrenderer/-/merge_requests/374/diffs#14086999aaf57fc68a3d7d639ab280c3a2672430_603_670
>> >
>> > We need to figure out a way to call kvm_region_add / kvm_region_del
>> > from virtio-gpu-3d.c with this address.
>>
>> Global initialization:
>>  (1) Create a memory region for the virtual pci bar,
>>      using memory_region_init()  That'll be just a container.
>>
>> Resource initialization:
>>  (1) Create a memory region for each resource you want be able to map,
>>      using memory_region_init_ram_ptr().
>>  (2) Register the resource region as child in the container, using
>>      memory_region_add_subregion().
>>
>> RESOURCE_MAP:
>>  (1) Move the memory region to the place the guest asks for, using
>>      memory_region_set_address().
>>  (2) Enable the region (memory_region_set_enabled()).
>>
>> RESOURCE_UNMAP:
>>  (1) Disable the region (memory_region_set_enabled()).
>>
>> HTH,
>>   Gerd
>>
>>
>> _______________________________________________
>> virglrenderer-devel mailing list
>> virglrenderer-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/virglrenderer-devel
>>
>
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