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SubjectRe: [PATCH v8 11/28] gunyah: rsc_mgr: Add VM lifecycle RPC
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On 1/8/2023 11:13 PM, Srivatsa Vaddagiri wrote:
> * Elliot Berman <quic_eberman@quicinc.com> [2022-12-19 14:58:32]:
>
>> +/* Call: CONSOLE_OPEN, CONSOLE_CLOSE, CONSOLE_FLUSH */
>
> I think this struct is used by other calls as well?
> Also CONSOLE_** functions are not yet introduced in this patch
>
>> +struct gh_vm_common_vmid_req {
>> + __le16 vmid;
>> + __le16 reserved0;
>> +} __packed;
>
> [snip]
>
>> +int gh_rm_alloc_vmid(struct gh_rm_rpc *rm, u16 vmid)
>> +{
>> + void *resp;
>> + struct gh_vm_common_vmid_req req_payload = {
>> + .vmid = cpu_to_le16(vmid),
>> + };
>> + struct gh_vm_common_vmid_req *resp_payload;
>> + size_t resp_size;
>> + int ret;
>> +
>> + if (vmid == GH_VMID_INVAL)
>> + vmid = 0;
>> +
>> + ret = gh_rm_call(rm, GH_RM_RPC_VM_ALLOC_VMID, &req_payload, sizeof(req_payload), &resp,
>> + &resp_size);
>> + if (ret)
>> + return ret;
>> +
>> + if (!vmid) {
>> + if (resp_size != sizeof(*resp_payload)) {
>> + ret = -EINVAL;
>> + } else {
>> + resp_payload = resp;
>> + ret = resp_payload->vmid;
>
> Do we need a le_to_cpu() wrapper on the response here?
>
>> +int gh_rm_vm_stop(struct gh_rm_rpc *rm, u16 vmid)
>> +{
>> + struct gh_vm_stop_req req_payload = {
>> + .vmid = cpu_to_le16(vmid),
>> + };
>> + void *resp;
>> + size_t resp_size;
>> + int ret;
>> +
>> + ret = gh_rm_call(rm, GH_RM_RPC_VM_STOP, &req_payload, sizeof(req_payload),
>> + &resp, &resp_size);
>> + if (ret)
>> + return ret;
>> + kfree(resp);
>
> Why not use gh_rm_common_vmid_call() here as well?
>
> return gh_rm_common_vmid_call(rm, GH_RM_RPC_VM_STOP, vmid);
>
>> +
>> + return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(gh_rm_vm_stop);
>> +
>
> [snip]
>
>> +ssize_t gh_rm_get_hyp_resources(struct gh_rm_rpc *rm, u16 vmid,
>> + struct gh_rm_hyp_resource **resources)
>> +{
>> + struct gh_vm_get_hyp_resources_resp *resp;
>> + size_t resp_size;
>> + int ret;
>> + struct gh_vm_common_vmid_req req_payload = {
>> + .vmid = cpu_to_le16(vmid),
>> + };
>> +
>> + ret = gh_rm_call(rm, GH_RM_RPC_VM_GET_HYP_RESOURCES,
>> + &req_payload, sizeof(req_payload),
>> + (void **)&resp, &resp_size);
>> + if (ret)
>> + return ret;
>> +
>> + if (resp_size < sizeof(*resp) ||
>> + (sizeof(*resp->entries) && (resp->n_entries > U32_MAX / sizeof(*resp->entries))) ||
>> + (resp_size != sizeof(*resp) + (resp->n_entries * sizeof(*resp->entries)))) {
>> + ret = -EIO;
>> + goto out;
>> + }
>> +
>> + *resources = kmemdup(resp->entries, (resp->n_entries * sizeof(*resp->entries)), GFP_KERNEL);
>
> Consider NULL return value from kmemdup
>
>> + ret = resp->n_entries;
>> +
>> +out:
>> + kfree(resp);
>> + return ret;
>> +}
>> +EXPORT_SYMBOL_GPL(gh_rm_get_hyp_resources);
>> +
>> +/**
>> + * gh_rm_get_vmid() - Retrieve VMID of this virtual machine
>> + * @vmid: Filled with the VMID of this VM
>> + */
>> +int gh_rm_get_vmid(struct gh_rm_rpc *rm, u16 *vmid)
>> +{
>> + static u16 cached_vmid = GH_VMID_INVAL;
>> + void *resp;
>> + size_t resp_size;
>> + int ret;
>> + int payload = 0;
>> +
>> + if (cached_vmid != GH_VMID_INVAL) {
>> + *vmid = cached_vmid;
>> + return 0;
>> + }
>> +
>> + ret = gh_rm_call(rm, GH_RM_RPC_VM_GET_VMID, &payload, sizeof(payload), &resp, &resp_size);
>> + if (ret)
>> + return ret;
>> +
>> + if (resp_size != sizeof(*vmid))
>
> kfree(resp) in this case?
>
>> + return -EIO;
>> + *vmid = *(u16 *)resp;
>
> Do we need a le_to_cpu() wrapper on the response?
> Also update cached_vmid in success case.
>
>> + kfree(resp);
>> +
>> + return ret;
>> +}

Applied all these.

Thanks,
Elliot

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