-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 On Mon, Jun 17, 2024 at 10:46:13PM +0200, Marek Marczykowski-Górecki wrote: > 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. Ouch! That makes me wonder if all GPU drivers actually need physically contiguous buffers, or if it is (as I suspect) driver-specific. CCing Christian König who has mentioned issues in this area. Given the recent progress on PVH dom0, is it reasonable to assume that PVH dom0 will be ready in time for R4.3, and that therefore Qubes OS doesn't need to worry about this problem on x86? - -- Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab -----BEGIN PGP SIGNATURE----- iQIzBAEBCgAdFiEEdodNnxM2uiJZBxxxsoi1X/+cIsEFAmZw22kACgkQsoi1X/+c IsGqtA/+INEbVP6pjKoMOJStaXajIvx19hJFU5HJQT0FBe4u2VXd3wfhK5gbJ90P NrlE3Lstzper0qBG7Lt8lt4DAcL9Q3Ml9d8M0K7z6VYIKPqiu2Wh/P25HD7r+Adn L2AMwnKUHtC02LJpT1Cjt/acKU3En9TMd35RhCNf4K+c9Swodtea3iOo7GzgQjNA TFMAYiiIlhwQIvThrVlcKktCMZajvhudxwfZTd3EfUkIQbMtc/ydkeqL92nV9Fg4 uz+AEeDDNhCGsEjrFUFTXKnXc/28jpVIc4mXyGW+x4dginRjrjRVmtNrnz/1wO+S X/xVUVnvLoTUXI+dKI9y5XmobVAJzLNZaEOEfnKePj5zA2ayRfnWybPBjzJuU+S4 wKevyBDlTuOdgtOT9nktd+qzXBQYtreEu8f+t9sEezURpVU/oOyrVn7Ui0RMtZID W3sXJH3NfVb3mWCsYOMpJyzb5VYfYR5PWN6Ggln/CHvfLTDI8TKdaO41INkXLlTC fA1cXVSKPn/VX9LRIFcQ81v9MGBAFkDX4Mf7z7xodi9Qopj+o2Yw66g5vLrPxPCH asJSdnrnaZAtZSsbEhY4uV5+4QLD0dyNUqj+HxRlODFwhpDyervCikfp0MoSsWmT qFvFHkiSqkx7E33QaVjmcGmFv4eWTVunYxW0j8tWnpWQLNLfPzY= =H5gN -----END PGP SIGNATURE-----
