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

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Date: Tue, 9 Jan 2024 16:31:42 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Elliot Berman <quic_eberman@...cinc.com>, 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 1/9/24 16:28, Elliot Berman wrote:
> 
> 
> 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.

I suspected that. Thanks for the change.

-- 
#Randy