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libvhost-user: Dynamically allocate memory for memory slots

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Let's prepare for increasing VHOST_USER_MAX_RAM_SLOTS by dynamically
allocating dev->regions. We don't have any ABI guarantees (not
dynamically linked), so we can simply change the layout of VuDev.

Let's zero out the memory, just as we used to do.

Reviewed-by: Raphael Norwitz <raphael@enfabrica.net>
Acked-by: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20240214151701.29906-2-david@redhat.com>
Tested-by: Mario Casquero <mcasquer@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
David Hildenbrand 2024-02-14 16:16:48 +01:00 committed by Michael S. Tsirkin
parent 9ed62809b6
commit d884e27278
2 changed files with 12 additions and 1 deletions
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11
subprojects/libvhost-user/libvhost-user.c
View File

@ -2171,6 +2171,8 @@ vu_deinit(VuDev *dev)
free(dev->vq);
dev->vq = NULL;
free(dev->regions);
dev->regions = NULL;
}
bool
@ -2205,9 +2207,18 @@ vu_init(VuDev *dev,
dev->backend_fd = -1;
dev->max_queues = max_queues;
dev->regions = malloc(VHOST_USER_MAX_RAM_SLOTS * sizeof(dev->regions[0]));
if (!dev->regions) {
DPRINT("%s: failed to malloc mem regions\n", __func__);
return false;
}
memset(dev->regions, 0, VHOST_USER_MAX_RAM_SLOTS * sizeof(dev->regions[0]));
dev->vq = malloc(max_queues * sizeof(dev->vq[0]));
if (!dev->vq) {
DPRINT("%s: failed to malloc virtqueues\n", __func__);
free(dev->regions);
dev->regions = NULL;
return false;
}

2
subprojects/libvhost-user/libvhost-user.h
View File

@ -398,7 +398,7 @@ typedef struct VuDevInflightInfo {
struct VuDev {
int sock;
uint32_t nregions;
VuDevRegion regions[VHOST_USER_MAX_RAM_SLOTS];
VuDevRegion *regions;
VuVirtq *vq;
VuDevInflightInfo inflight_info;
int log_call_fd;