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Differential D31986 Diff 97902 sys/dev/xen/gntdev/gntdev.c

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sys/dev/xen/gntdev/gntdev.c

Show First 20 Lines • Show All 362 Lines • ▼ Show 20 Linesgntdev_alloc_gref(struct ioctl_gntdev_alloc_gref *arg)
/* Allocate grefs. */ /* Allocate grefs. */
grefs = malloc(sizeof(*grefs) * arg->count, M_GNTDEV, M_WAITOK); grefs = malloc(sizeof(*grefs) * arg->count, M_GNTDEV, M_WAITOK);
for (i = 0; i < arg->count; i++) { for (i = 0; i < arg->count; i++) {
grefs[i].file_index = file_offset + i * PAGE_SIZE; grefs[i].file_index = file_offset + i * PAGE_SIZE;
grefs[i].gref_id = GRANT_REF_INVALID; grefs[i].gref_id = GRANT_REF_INVALID;
grefs[i].notify = NULL; grefs[i].notify = NULL;
grefs[i].page = vm_page_alloc(NULL, 0, VM_ALLOC_NORMAL grefs[i].page = vm_page_alloc_noobj(VM_ALLOC_WIRED |
| VM_ALLOC_NOOBJ | VM_ALLOC_WIRED | VM_ALLOC_ZERO); VM_ALLOC_ZERO);
if (grefs[i].page == NULL) { if (grefs[i].page == NULL) {
log(LOG_ERR, "Page allocation failed."); log(LOG_ERR, "Page allocation failed.");
error = ENOMEM; error = ENOMEM;
break; break;
}
if ((grefs[i].page->flags & PG_ZERO) == 0) {
/*
* Zero the allocated page, as we don't want to
* leak our memory to other domains.
*/
pmap_zero_page(grefs[i].page);
} }
grefs[i].page->valid = VM_PAGE_BITS_ALL; grefs[i].page->valid = VM_PAGE_BITS_ALL;
error = gnttab_grant_foreign_access(arg->domid, error = gnttab_grant_foreign_access(arg->domid,
(VM_PAGE_TO_PHYS(grefs[i].page) >> PAGE_SHIFT), (VM_PAGE_TO_PHYS(grefs[i].page) >> PAGE_SHIFT),
readonly, &grefs[i].gref_id); readonly, &grefs[i].gref_id);
if (error != 0) { if (error != 0) {
log(LOG_ERR, "Grant Table Hypercall failed."); log(LOG_ERR, "Grant Table Hypercall failed.");
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