linux-kernel - Re: [PATCH v1 2/3] nitro_enclaves: Update documentation for Arm support

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Message-ID: <7828f0fc-cc99-aa80-ff95-8d24a73ca4a3@amazon.com>
Date:   Fri, 27 Aug 2021 12:35:45 +0300
From:   "Paraschiv, Andra-Irina" <andraprs@...zon.com>
To:     Stefano Garzarella <sgarzare@...hat.com>
CC:     linux-kernel <linux-kernel@...r.kernel.org>,
        Alexandru Ciobotaru <alcioa@...zon.com>,
        Greg KH <gregkh@...uxfoundation.org>,
        Kamal Mostafa <kamal@...onical.com>,
        Alexandru Vasile <lexnv@...zon.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Stefan Hajnoczi <stefanha@...hat.com>,
        "Vitaly Kuznetsov" <vkuznets@...hat.com>,
        kvm <kvm@...r.kernel.org>,
        ne-devel-upstream <ne-devel-upstream@...zon.com>
Subject: Re: [PATCH v1 2/3] nitro_enclaves: Update documentation for Arm
 support



On 27/08/2021 10:21, Stefano Garzarella wrote:
> On Thu, Aug 26, 2021 at 08:34:50PM +0300, Andra Paraschiv wrote:
>> Add references for hugepages and booting steps for Arm.
>>
>> Signed-off-by: Andra Paraschiv <andraprs@...zon.com>
>> ---
>> Documentation/virt/ne_overview.rst | 8 +++++---
>> 1 file changed, 5 insertions(+), 3 deletions(-)
>
> If you need to respin, maybe we can add a little section with 
> supported architectures (x86, ARM64).
>

Sure, I can add this info.

Thanks, Stefano, for review and ack.

Andra

>
>>
>> diff --git a/Documentation/virt/ne_overview.rst 
>> b/Documentation/virt/ne_overview.rst
>> index 39b0c8fe2654a..2777da1fb0ad1 100644
>> --- a/Documentation/virt/ne_overview.rst
>> +++ b/Documentation/virt/ne_overview.rst
>> @@ -43,8 +43,8 @@ for the enclave VM. An enclave does not have 
>> persistent storage attached.
>> The memory regions carved out of the primary VM and given to an 
>> enclave need to
>> be aligned 2 MiB / 1 GiB physically contiguous memory regions (or 
>> multiple of
>> this size e.g. 8 MiB). The memory can be allocated e.g. by using 
>> hugetlbfs from
>> -user space [2][3]. The memory size for an enclave needs to be at 
>> least 64 MiB.
>> -The enclave memory and CPUs need to be from the same NUMA node.
>> +user space [2][3][7]. The memory size for an enclave needs to be at 
>> least
>> +64 MiB. The enclave memory and CPUs need to be from the same NUMA node.
>>
>> An enclave runs on dedicated cores. CPU 0 and its CPU siblings need 
>> to remain
>> available for the primary VM. A CPU pool has to be set for NE 
>> purposes by an
>> @@ -61,7 +61,7 @@ device is placed in memory below the typical 4 GiB.
>> The application that runs in the enclave needs to be packaged in an 
>> enclave
>> image together with the OS ( e.g. kernel, ramdisk, init ) that will 
>> run in the
>> enclave VM. The enclave VM has its own kernel and follows the 
>> standard Linux
>> -boot protocol [6].
>> +boot protocol [6][8].
>>
>> The kernel bzImage, the kernel command line, the ramdisk(s) are part 
>> of the
>> Enclave Image Format (EIF); plus an EIF header including metadata 
>> such as magic
>> @@ -93,3 +93,5 @@ enclave process can exit.
>> [4] 
>> https://www.kernel.org/doc/html/latest/admin-guide/kernel-parameters.html
>> [5] https://man7.org/linux/man-pages/man7/vsock.7.html
>> [6] https://www.kernel.org/doc/html/latest/x86/boot.html
>> +[7] https://www.kernel.org/doc/html/latest/arm64/hugetlbpage.html
>> +[8] https://www.kernel.org/doc/html/latest/arm64/booting.html
>> -- 
>> 2.20.1 (Apple Git-117)
>>
>>
>>
>>
>> Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. 
>> Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. 
>> Registered in Romania. Registration number J22/2621/2005.
>>
>




Amazon Development Center (Romania) S.R.L. registered office: 27A Sf. Lazar Street, UBC5, floor 2, Iasi, Iasi County, 700045, Romania. Registered in Romania. Registration number J22/2621/2005.