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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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14
include/hw/xen/xen-legacy-backend.h
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@ -66,18 +66,8 @@ static inline void xen_be_unmap_grant_ref(struct XenLegacyDevice *xendev,
return xen_be_unmap_grant_refs(xendev, ptr, &ref, 1);
}
/* actual backend drivers */
extern struct XenDevOps xen_console_ops; /* xen_console.c */
extern struct XenDevOps xen_kbdmouse_ops; /* xen_framebuffer.c */
extern struct XenDevOps xen_framebuffer_ops; /* xen_framebuffer.c */
extern struct XenDevOps xen_blkdev_ops; /* xen_disk.c */
#ifdef CONFIG_VIRTFS
extern struct XenDevOps xen_9pfs_ops; /* xen-9p-backend.c */
#endif
extern struct XenDevOps xen_netdev_ops; /* xen_nic.c */
#ifdef CONFIG_USB_LIBUSB
extern struct XenDevOps xen_usb_ops; /* xen-usb.c */
#endif
/* backend drivers not included in all machines */
extern struct XenDevOps xen_framebuffer_ops; /* xenfb.c */
/* configuration (aka xenbus setup) */
void xen_config_cleanup(void);