tjh.dev / kernel
Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel os linux
1
fork

Configure Feed

Select the types of activity you want to include in your feed.

xen/virtio: Don't use grant-dma-ops when running as Dom0

Dom0 inherit devices from the machine and is usually in PV mode.
If we are running in a virtual that has virtio devices, these devices
would be considered as using grants with Dom0 as backend, while being
the said Dom0 itself, while we want to use these devices like regular
PCI devices.

Fix this by preventing grant-dma-ops from being used when running as Dom0
(initial domain). We still keep the device-tree logic as-is.

Signed-off-by: Teddy Astie <teddy.astie@vates.tech>
Fixes: 61367688f1fb0 ("xen/virtio: enable grant based virtio on x86")
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Message-ID: <6698564dd2270a9f7377b78ebfb20cb425cabbe8.1767720955.git.teddy.astie@vates.tech>

authored by

Teddy Astie and committed by
Juergen Gross dc8ea871 db9aded9

+2 -1
+2 -1
drivers/xen/grant-dma-ops.c
··· 366 366 if (np) { 367 367 ret = xen_dt_grant_init_backend_domid(dev, np, backend_domid); 368 368 of_node_put(np); 369 - } else if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT) || xen_pv_domain()) { 369 + } else if (!xen_initial_domain() && 370 + (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT) || xen_pv_domain())) { 370 371 dev_info(dev, "Using dom0 as backend\n"); 371 372 *backend_domid = 0; 372 373 ret = 0;