Remove fixed limit on number of guests, and lguests array.

Back when we had all the Guest state in the switcher, we had a fixed
array of them.  This is no longer necessary.

If we switch the network code to using random_ether_addr (46 bits is
enough to avoid clashes), we can get rid of the concept of "guest id"
altogether.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

1 files changed, 5 insertions, 5 deletions

diff --git a/drivers/lguest/io.c b/drivers/lguest/io.c
index 3a845335fee8..0e842e9caf68 100644
--- a/drivers/lguest/io.c
+++ b/drivers/lguest/io.c
@@ -212,7 +212,7 @@ int bind_dma(struct lguest *lg,
                         lg->dma[i].num_dmas = numdmas;
                         lg->dma[i].next_dma = 0;
                         lg->dma[i].key = key;
-                        lg->dma[i].guestid = lg->guestid;
+                        lg->dma[i].owner = lg;
                         lg->dma[i].interrupt = interrupt;
 
                         /* Now we add it to the hash table: the position
@@ -412,7 +412,7 @@ static int dma_transfer(struct lguest *srclg,
 
         /* From the "struct lguest_dma_info" we found in the hash, grab the
          * Guest. */
-        dstlg = &lguests[dst->guestid];
+        dstlg = dst->owner;
         /* Read in the source "struct lguest_dma" handed to SEND_DMA. */
         lgread(srclg, &src_dma, udma, sizeof(src_dma));
 
@@ -506,8 +506,8 @@ again:
                 struct lguest_dma_info *i;
                 /* Look through the hash for other Guests. */
                 list_for_each_entry(i, &dma_hash[hash(&key)], list) {
-                        /* Don't send to ourselves. */
-                        if (i->guestid == lg->guestid)
+                        /* Don't send to ourselves (would deadlock). */
+                        if (i->owner->mm == lg->mm)
                                 continue;
                         if (!key_eq(&key, &i->key))
                                 continue;
@@ -594,7 +594,7 @@ unsigned long get_dma_buffer(struct lguest *lg,
          * send to its own Guest for the moment, so the entry must be for this
          * Guest) */
         list_for_each_entry(i, &dma_hash[hash(&key)], list) {
-                if (key_eq(&key, &i->key) && i->guestid == lg->guestid) {
+                if (key_eq(&key, &i->key) && i->owner == lg) {
                         unsigned int j;
                         /* Look through the registered DMA array for an
                          * available buffer. */