linux-kernel - Re: [PATCH v17 12/35] virt: gunyah: Add resource tickets

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Date: Mon, 11 Mar 2024 11:08:06 +0530
From: Srivatsa Vaddagiri <quic_svaddagi@...cinc.com>
To: Elliot Berman <quic_eberman@...cinc.com>
CC: Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla
	<srinivas.kandagatla@...aro.org>,
        Murali Nalajal <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        Carl van Schaik
	<quic_cvanscha@...cinc.com>,
        Philip Derrin <quic_pderrin@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Jonathan Corbet
	<corbet@....net>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski
	<krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        "Fuad
 Tabba" <tabba@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>,
        "Andrew
 Morton" <akpm@...ux-foundation.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-doc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH v17 12/35] virt: gunyah: Add resource tickets

* Elliot Berman <quic_eberman@...cinc.com> [2024-02-22 15:16:35]:

> Gunyah doesn't process the label and that makes it
> possible for userspace to create multiple resources with the same label.

I think that description conflicts with what is implemented in this patch?

int gunyah_vm_add_resource_ticket(struct gunyah_vm *ghvm,
				  struct gunyah_vm_resource_ticket *ticket)
{
	mutex_lock(&ghvm->resources_lock);
	list_for_each_entry(iter, &ghvm->resource_tickets, vm_list) {
		if (iter->resource_type == ticket->resource_type &&
		    iter->label == ticket->label) {
			ret = -EEXIST;
			goto out;
		}
	}


//

> @@ -134,6 +246,25 @@ static int gunyah_vm_start(struct gunyah_vm *ghvm)
>  	}
>  	ghvm->vm_status = GUNYAH_RM_VM_STATUS_READY;
>  
> +	ret = gunyah_rm_get_hyp_resources(ghvm->rm, ghvm->vmid, &resources);
> +	if (ret) {
> +		dev_warn(ghvm->parent,
> +			 "Failed to get hypervisor resources for VM: %d\n",
> +			 ret);
> +		goto err;
> +	}

Where do we free memory pointed by 'resources' ptr?

> +
> +	for (i = 0, n = le32_to_cpu(resources->n_entries); i < n; i++) {
> +		ghrsc = gunyah_rm_alloc_resource(ghvm->rm,
> +						 &resources->entries[i]);
> +		if (!ghrsc) {
> +			ret = -ENOMEM;
> +			goto err;
> +		}
> +
> +		gunyah_vm_add_resource(ghvm, ghrsc);
> +	}