linux-kernel - Re: [PATCH v6 02/21] dt-bindings: Add binding for gunyah hypervisor

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Date:   Mon, 31 Oct 2022 20:19:52 -0700
From:   Elliot Berman <quic_eberman@...cinc.com>
To:     Jassi Brar <jassisinghbrar@...il.com>
CC:     Bjorn Andersson <quic_bjorande@...cinc.com>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Murali Nalajala <quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        "Srivatsa Vaddagiri" <quic_svaddagi@...cinc.com>,
        Carl van Schaik <quic_cvanscha@...cinc.com>,
        Prakruthi Deepak Heragu <quic_pheragu@...cinc.com>,
        Andy Gross <agross@...nel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        "Mark Rutland" <mark.rutland@....com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Sudeep Holla <sudeep.holla@....com>,
        "Marc Zyngier" <maz@...nel.org>, Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Srinivas Kandagatla" <srinivas.kandagatla@...aro.org>,
        Amol Maheshwari <amahesh@....qualcomm.com>,
        Kalle Valo <kvalo@...nel.org>, <devicetree@...r.kernel.org>,
        <linux-doc@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v6 02/21] dt-bindings: Add binding for gunyah hypervisor

Hi Jassi,

On 10/27/2022 7:33 PM, Jassi Brar wrote:
 > On Wed, Oct 26, 2022 at 1:59 PM Elliot Berman 
<quic_eberman@...cinc.com> wrote:
 > .....
 >> +
 >> +        gunyah-resource-mgr@0 {
 >> +            compatible = "gunyah-resource-manager-1-0", 
"gunyah-resource-manager";
 >> +            interrupts = <GIC_SPI 3 IRQ_TYPE_EDGE_RISING>, /* TX 
full IRQ */
 >> +                         <GIC_SPI 4 IRQ_TYPE_EDGE_RISING>; /* RX 
empty IRQ */
 >> +            reg = <0x00000000 0x00000000>, <0x00000000 0x00000001>;
 >> +                  /* TX, RX cap ids */
 >> +        };
 >>
 > All these resources are used only by the mailbox controller driver.
 > So, this should be the mailbox controller node, rather than the
 > mailbox user.> One option is to load gunyah-resource-manager as a 
module that relies
 > on the gunyah-mailbox provider. That would also avoid the "Allow
 > direct registration to a channel" hack patch.

A message queue to another guest VM wouldn't be known at boot time and 
thus couldn't be described on the devicetree. We will need "Allow direct 
registration to a channel" patch anyway to support those message queues. 
I would like to have one consistent mechanism to set up message queues.

- Elliot