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vhost: factor out IOTLB

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This patch factors out IOTLB into a dedicated module in order to be
reused by other modules like vringh. User may choose to enable the
automatic retiring by specifying VHOST_IOTLB_FLAG_RETIRE flag to fit
for the case of vhost device IOTLB implementation.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200326140125.19794-4-jasowang@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Jason Wang
2020-03-26 22:01:19 +08:00
committed by Michael S. Tsirkin
parent 792a4f2ed2
commit 0bbe30668d
8 changed files with 315 additions and 181 deletions
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47
include/linux/vhost_iotlb.h Normal file
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@@ -0,0 +1,47 @@
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_VHOST_IOTLB_H
#define _LINUX_VHOST_IOTLB_H
#include <linux/interval_tree_generic.h>
struct vhost_iotlb_map {
struct rb_node rb;
struct list_head link;
u64 start;
u64 last;
u64 size;
u64 addr;
#define VHOST_MAP_RO 0x1
#define VHOST_MAP_WO 0x2
#define VHOST_MAP_RW 0x3
u32 perm;
u32 flags_padding;
u64 __subtree_last;
};
#define VHOST_IOTLB_FLAG_RETIRE 0x1
struct vhost_iotlb {
struct rb_root_cached root;
struct list_head list;
unsigned int limit;
unsigned int nmaps;
unsigned int flags;
};
int vhost_iotlb_add_range(struct vhost_iotlb *iotlb, u64 start, u64 last,
u64 addr, unsigned int perm);
void vhost_iotlb_del_range(struct vhost_iotlb *iotlb, u64 start, u64 last);
struct vhost_iotlb *vhost_iotlb_alloc(unsigned int limit, unsigned int flags);
void vhost_iotlb_free(struct vhost_iotlb *iotlb);
void vhost_iotlb_reset(struct vhost_iotlb *iotlb);
struct vhost_iotlb_map *
vhost_iotlb_itree_first(struct vhost_iotlb *iotlb, u64 start, u64 last);
struct vhost_iotlb_map *
vhost_iotlb_itree_next(struct vhost_iotlb_map *map, u64 start, u64 last);
void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
struct vhost_iotlb_map *map);
#endif