On Mon, Jun 17, 2024 at 09:46:29AM +0200, Roger Pau Monné wrote: > On Sun, Jun 16, 2024 at 08:38:19PM -0400, Demi Marie Obenour wrote: > > In both cases, the device physical > > addresses are identical to dom0’s physical addresses. > > Yes, but a PV dom0 physical address space can be very scattered. > > IIRC there's an hypercall to request physically contiguous memory for > PV, but you don't want to be using that every time you allocate a > buffer (not sure it would support the sizes needed by the GPU > anyway).
Indeed that isn't going to fly. In older Qubes versions we had PV sys-net with PCI passthrough for a network card. After some uptime it was basically impossible to restart and still have enough contagious memory for a network driver, and there it was about _much_ smaller buffers, like 2M or 4M. At least not without shutting down a lot more things to free some more memory. -- Best Regards, Marek Marczykowski-Górecki Invisible Things Lab
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