* Elliot Berman <quic_eberman@xxxxxxxxxxx> [2023-01-20 14:46:21]:
+int ghvm_add_resource_ticket(struct gunyah_vm *ghvm, struct gunyah_vm_resource_ticket *ticket)
+{
+ struct gunyah_vm_resource_ticket *iter;
+ struct gunyah_resource *ghrsc;
+ int ret = 0;
+
+ mutex_lock(&ghvm->resources_lock);
+ list_for_each_entry(iter, &ghvm->resource_tickets, list) {
+ if (iter->resource_type == ticket->resource_type && iter->label == ticket->label) {
+ ret = -EEXIST;
+ goto out;
+ }
+ }
+
+ if (!try_module_get(ticket->owner)) {
+ ret = -ENODEV;
+ goto out;
+ }
+
+ list_add(&ticket->list, &ghvm->resource_tickets);
+ INIT_LIST_HEAD(&ticket->resources);
+
+ list_for_each_entry(ghrsc, &ghvm->resources, list) {
+ if (ghrsc->type == ticket->resource_type && ghrsc->rm_label == ticket->label) {
+ if (!ticket->populate(ticket, ghrsc))
+ list_move(&ghrsc->list, &ticket->resources);
Do we need the search to continue in case of a hit? 'gh_vm_add_resource' seems to
break loop on first occurrence.
Also do we have examples of more than one 'gunyah_resource' being associated
with same 'gunyah_vm_resource_ticket'? Both vcpu and irqfd tickets seem to deal
with just one resource?
static int gh_vm_start(struct gunyah_vm *ghvm)
{
struct gunyah_vm_memory_mapping *mapping;
u64 dtb_offset;
u32 mem_handle;
- int ret;
+ struct gunyah_resource *ghrsc;
+ struct gh_rm_hyp_resources *resources;
+ int ret, i;
down_write(&ghvm->status_lock);
if (ghvm->vm_status != GH_RM_VM_STATUS_NO_STATE) {
@@ -241,6 +314,22 @@ static int gh_vm_start(struct gunyah_vm *ghvm)
goto err;
}
+ ret = gh_rm_get_hyp_resources(ghvm->rm, ghvm->vmid, &resources);
+ if (ret) {
+ pr_warn("Failed to get hypervisor resources for VM: %d\n", ret);
+ goto err;
+ }
+
+ for (i = 0; i < le32_to_cpu(resources->n_entries); i++) {
minor nit: not sure if we can rely on compiler to optimize this, but it would
be better if we run le32_to_cpu once and use the result in loop.
+ ghrsc = gh_rm_alloc_resource(ghvm->rm, &resources->entries[i]);
+ if (!ghrsc) {
+ ret = -ENOMEM;
+ goto err;
+ }
+
+ gh_vm_add_resource(ghvm, ghrsc);
Shouldn't we have gh_vm_add_resource()-> ticket->populate() return a result and
in case of failure we should bail out from this loop?
+ }
+
ret = gh_rm_vm_start(ghvm->rm, ghvm->vmid);
if (ret) {
pr_warn("Failed to start VM: %d\n", ret);