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Introduce qemu_put_ram_ptr

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This function allows to unlock a ram_ptr give by qemu_get_ram_ptr. After
a call to qemu_put_ram_ptr, the pointer may be unmap from QEMU when
used with Xen.

Signed-off-by: Anthony PERARD <anthony.perard@citrix.com>
Acked-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Anthony PERARD 2010-09-16 13:57:49 +01:00 • committed by Alexander Graf
parent ea6c5f8ffe
commit 050a0ddf39
4 changed files with 72 additions and 3 deletions
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33
xen-mapcache.c
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@ -196,6 +196,39 @@ uint8_t *qemu_map_cache(target_phys_addr_t phys_addr, target_phys_addr_t size, u
return mapcache->last_address_vaddr + address_offset;
}
void qemu_map_cache_unlock(void *buffer)
{
MapCacheEntry *entry = NULL, *pentry = NULL;
MapCacheRev *reventry;
target_phys_addr_t paddr_index;
int found = 0;
QTAILQ_FOREACH(reventry, &mapcache->locked_entries, next) {
if (reventry->vaddr_req == buffer) {
paddr_index = reventry->paddr_index;
found = 1;
break;
}
}
if (!found) {
return;
}
QTAILQ_REMOVE(&mapcache->locked_entries, reventry, next);
qemu_free(reventry);
entry = &mapcache->entry[paddr_index % mapcache->nr_buckets];
while (entry && entry->paddr_index != paddr_index) {
pentry = entry;
entry = entry->next;
}
if (!entry) {
return;
}
if (entry->lock > 0) {
entry->lock--;
}
}
ram_addr_t qemu_ram_addr_from_mapcache(void *ptr)
{
MapCacheRev *reventry;