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xen: register legacy backends via xen_backend_init

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It is okay to register legacy backends in the middle of xen_bus_init().
All that the registration does is record the existence of the backend
in xenstore.

This makes it possible to remove them from the build without introducing
undefined symbols in xen_be_init().  It also removes the need for the
backend_register callback, whose only purpose is to avoid registering
nonfunctional backends.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20240509170044.190795-8-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2024-05-09 19:00:38 +02:00
parent 0973996fe4
commit 88f5ed7017
6 changed files with 20 additions and 41 deletions
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8
hw/9pfs/xen-9p-backend.c
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@ -513,7 +513,7 @@ static void xen_9pfs_alloc(struct XenLegacyDevice *xendev)
xenstore_write_be_int(xendev, "max-ring-page-order", MAX_RING_ORDER);
}
struct XenDevOps xen_9pfs_ops = {
static struct XenDevOps xen_9pfs_ops = {
.size = sizeof(Xen9pfsDev),
.flags = DEVOPS_FLAG_NEED_GNTDEV,
.alloc = xen_9pfs_alloc,
@ -522,3 +522,9 @@ struct XenDevOps xen_9pfs_ops = {
.disconnect = xen_9pfs_disconnect,
.free = xen_9pfs_free,
};
static void xen_9pfs_register_backend(void)
{
xen_be_register("9pfs", &xen_9pfs_ops);
}
xen_backend_init(xen_9pfs_register_backend);