On Wed, Mar 13, 2024 at 01:55:20PM +0900, David Stevens wrote: > On Thu, Feb 29, 2024 at 10:36 PM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote: > > > > On Thu, Feb 29, 2024 at 11:57:51AM +0900, David Stevens wrote: > > > Our use case is virtio-gpu blob resources [1], which directly map host > > > graphics buffers into the guest as "vram" for the virtio-gpu device. > > > This feature currently does not work on systems using the amdgpu driver, > > > as that driver allocates non-compound higher order pages via > > > ttm_pool_alloc_page(). > > > > .. and just as last time around that is still the problem that needs > > to be fixed instead of creating a monster like this to map > > non-refcounted pages. > > > > Patches to amdgpu to have been NAKed [1] with the justification that > using non-refcounted pages is working as intended and KVM is in the > wrong for wanting to take references to pages mapped with VM_PFNMAP > [2]. So make them not work for KVM as they should to kick the amdgpu maintainers a***es.
