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Message-ID: <20230206095010.GF332@quicinc.com>
Date: Mon, 6 Feb 2023 15:20:10 +0530
From: Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>
To: Elliot Berman <quic_eberman@...cinc.com>
CC: Bjorn Andersson <quic_bjorande@...cinc.com>,
Alex Elder <elder@...aro.org>,
Murali Nalajala <quic_mnalajal@...cinc.com>,
Trilok Soni <quic_tsoni@...cinc.com>,
Carl van Schaik <quic_cvanscha@...cinc.com>,
Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
Arnd Bergmann <arnd@...db.de>,
"Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Jonathan Corbet <corbet@....net>,
Bagas Sanjaya <bagasdotme@...il.com>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will@...nel.org>, Marc Zyngier <maz@...nel.org>,
Jassi Brar <jassisinghbrar@...il.com>,
Sudeep Holla <sudeep.holla@....com>,
<linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>, <linux-doc@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 22/27] virt: gunyah: Add resource tickets
* Elliot Berman <quic_eberman@...cinc.com> [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);
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