linux-kernel - Re: [PATCH v16 01/34] docs: gunyah: Introduce Gunyah Hypervisor

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Date: Tue, 9 Jan 2024 16:28:46 -0800
From: Elliot Berman <quic_eberman@...cinc.com>
To: Randy Dunlap <rdunlap@...radead.org>, Alex Elder <elder@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Murali Nalajal
	<quic_mnalajal@...cinc.com>,
        Trilok Soni <quic_tsoni@...cinc.com>,
        "Srivatsa
 Vaddagiri" <quic_svaddagi@...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>
CC: <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 v16 01/34] docs: gunyah: Introduce Gunyah Hypervisor



On 1/9/2024 3:31 PM, Randy Dunlap wrote:
> 
> 
> On 1/9/24 11:37, Elliot Berman wrote:
>> Gunyah is an open-source Type-1 hypervisor developed by Qualcomm. It
>> does not depend on any lower-privileged OS/kernel code for its core
>> functionality. This increases its security and can support a smaller
>> trusted computing based when compared to Type-2 hypervisors.
>>
>> Add documentation describing the Gunyah hypervisor and the main
>> components of the Gunyah hypervisor which are of interest to Linux
>> virtualization development.
>>
>> Signed-off-by: Elliot Berman <quic_eberman@...cinc.com>
>> ---
>>  Documentation/virt/gunyah/index.rst         | 134 ++++++++++++++++++++++++++++
>>  Documentation/virt/gunyah/message-queue.rst |  68 ++++++++++++++
>>  Documentation/virt/index.rst                |   1 +
>>  3 files changed, 203 insertions(+)
>>
>> diff --git a/Documentation/virt/gunyah/index.rst b/Documentation/virt/gunyah/index.rst
>> new file mode 100644
>> index 000000000000..da8e5e4b9cac
>> --- /dev/null
>> +++ b/Documentation/virt/gunyah/index.rst
>> @@ -0,0 +1,134 @@
>> +.. SPDX-License-Identifier: GPL-2.0
>> +
>> +=================
>> +Gunyah Hypervisor
>> +=================
>> +
>> +.. toctree::
>> +   :maxdepth: 1
>> +
>> +   message-queue
>> +
>> +Gunyah is a Type-1 hypervisor which is independent of any OS kernel, and runs in
>> +a higher CPU privilege level. It does not depend on any lower-privileged
> 
> Is this the usual meaning of higher and lower? Seems backwards to me.
> 

Hmm, I guess this x86 having ring 0 as most privileged and arm using EL3 as most
privileged. I'll switch to "more" and "less" privilege rather than implying
a numbering scheme.

Thanks for the rest of suggestions, applied those!

- Elliot