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ivshmem: remove max_peer field 

max_peer isn't really useful, it tracks the maximum received VM id, but
that quickly matches nb_peers, the size of the peers array. Since VM
come and go, there might be sparse peers so it doesn't help much in
general to have this value around.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Claudio Fontana <claudio.fontana@huawei.com>
This commit is contained in:
Marc-André Lureau 2015-06-19 12:17:26 +02:00
parent 95e7c8a0f6
commit 95c8425cc3
1 changed files with 1 additions and 9 deletions
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10
hw/misc/ivshmem.c
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@ -90,7 +90,6 @@ typedef struct IVShmemState {
Peer *peers;
int nb_peers; /* how many guests we have space for */
int max_peer; /* maximum numbered peer */
int vm_id;
uint32_t vectors;
@ -200,7 +199,7 @@ static void ivshmem_io_write(void *opaque, hwaddr addr,
case DOORBELL:
/* check that dest VM ID is reasonable */
if (dest > s->max_peer) {
if (dest >= s->nb_peers) {
IVSHMEM_DPRINTF("Invalid destination VM ID (%d)\n", dest);
break;
}
@ -574,11 +573,6 @@ static void ivshmem_read(void *opaque, const uint8_t *buf, int size)
/* increment count for particular guest */
s->peers[incoming_posn].nb_eventfds++;
/* keep track of the maximum VM ID */
if (incoming_posn > s->max_peer) {
s->max_peer = incoming_posn;
}
if (incoming_posn == s->vm_id) {
s->eventfd_chr[guest_max_eventfd] = create_eventfd_chr_device(s,
&s->peers[s->vm_id].eventfds[guest_max_eventfd],
@ -721,8 +715,6 @@ static void pci_ivshmem_realize(PCIDevice *dev, Error **errp)
PCI_BASE_ADDRESS_MEM_PREFETCH;
Error *local_err = NULL;
s->max_peer = -1;
if (s->sizearg == NULL) {
s->ivshmem_size = 4 << 20; /* 4 MB default */
} else {