Commit e7c8cc35 authored by Matej Genci's avatar Matej Genci Committed by Michael S. Tsirkin
Browse files

virtio: add VIRTIO_RING_NO_LEGACY 



Add macro to disable legacy vring functions.

Signed-off-by: default avatarMatej Genci <matej.genci@nutanix.com>
Link: https://lore.kernel.org/r/20190911124942.243713-1-matej.genci@nutanix.com


Signed-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 3d77e6a8

drivers/virtio/virtio_pci_modern.c

+1 −0
Original line number Diff line number Diff line
@@ -16,6 +16,7 @@ 


#include <linux/delay.h>

#define VIRTIO_PCI_NO_LEGACY

#define VIRTIO_RING_NO_LEGACY

#include "virtio_pci_common.h"



/*

include/uapi/linux/virtio_ring.h

+4 −0
Original line number Diff line number Diff line
@@ -135,6 +135,8 @@ struct vring { 
#define VRING_USED_ALIGN_SIZE 4

#define VRING_DESC_ALIGN_SIZE 16



#ifndef VIRTIO_RING_NO_LEGACY



/* The standard layout for the ring is a continuous chunk of memory which looks

 * like this.  We assume num is a power of 2.

 *
@@ -181,6 +183,8 @@ static inline unsigned vring_size(unsigned int num, unsigned long align) 
		+ sizeof(__virtio16) * 3 + sizeof(struct vring_used_elem) * num;

}



#endif /* VIRTIO_RING_NO_LEGACY */



/* The following is used with USED_EVENT_IDX and AVAIL_EVENT_IDX */

/* Assuming a given event_idx value from the other side, if

 * we have just incremented index from old to new_idx,

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