From: Oleksandr <olekstysh@gmail.com>
To: Julien Grall <julien@xen.org>
Cc: xen-devel@lists.xenproject.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, Rob Herring <robh+dt@kernel.org>,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [PATCH V4 6/6] dt-bindings: xen: Clarify "reg" purpose
Date: Fri, 10 Dec 2021 11:33:12 +0200 [thread overview]
Message-ID: <35ee3534-9e24-5a11-0bf1-a5dd0b640186@gmail.com> (raw)
In-Reply-To: <669d3f56-13b8-f159-2053-b39f1ba4222f@xen.org>
On 10.12.21 11:09, Julien Grall wrote:
> Hi Oleksandr,
Hi Julien
>
> On 09/12/2021 20:05, Oleksandr Tyshchenko wrote:
>> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
>>
>> Xen on Arm has gained new support recently to calculate and report
>> extended regions (unused address space) safe to use for external
>> mappings. These regions are reported via "reg" property under
>> "hypervisor" node in the guest device-tree. As region 0 is reserved
>> for grant table space (always present), the indexes for extended
>> regions are 1...N.
>>
>> No device-tree bindings update is needed (except clarifying the text)
>> as guest infers the presence of extended regions from the number
>> of regions in "reg" property.
>>
>> While at it, remove the following sentence:
>> "This property is unnecessary when booting Dom0 using ACPI."
>> for "reg" and "interrupts" properties as the initialization is not
>> done via device-tree "hypervisor" node in that case anyway.
> You sent a similar patch for Xen and have already commented there [1]
> . In short, the OS will be using the node to discover whether it is
> running on Xen for both ACPI and DT. The hypervisor node also contain
> the UEFI information for dom0.
I agree with your comments. The sentence should remain in this case.
Thank you for pointing this out.
>
>
> Cheers,
>
> [1]
> https://lore.kernel.org/xen-devel/9602b019-6c20-cdc7-23f3-9e4f8fd720f6@xen.org/T/#t
>
--
Regards,
Oleksandr Tyshchenko
next prev parent reply other threads:[~2021-12-10 9:33 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-09 20:05 [PATCH V4 0/6] xen: Add support of extended regions (safe ranges) on Arm Oleksandr Tyshchenko
2021-12-09 20:05 ` [PATCH V4 1/6] xen/unpopulated-alloc: Drop check for virt_addr_valid() in fill_list() Oleksandr Tyshchenko
2021-12-09 20:05 ` [PATCH V4 2/6] arm/xen: Switch to use gnttab_setup_auto_xlat_frames() for DT Oleksandr Tyshchenko
2021-12-09 20:05 ` [PATCH V4 3/6] xen/balloon: Bring alloc(free)_xenballooned_pages helpers back Oleksandr Tyshchenko
2021-12-09 20:05 ` [PATCH V4 4/6] xen/unpopulated-alloc: Add mechanism to use Xen resource Oleksandr Tyshchenko
2021-12-10 1:19 ` Stefano Stabellini
2021-12-09 20:05 ` [PATCH V4 5/6] arm/xen: Read extended regions from DT and init " Oleksandr Tyshchenko
2021-12-09 20:05 ` [PATCH V4 6/6] dt-bindings: xen: Clarify "reg" purpose Oleksandr Tyshchenko
2021-12-10 9:09 ` Julien Grall
2021-12-10 9:33 ` Oleksandr [this message]
2021-12-10 11:36 ` Oleksandr Tyshchenko
2021-12-10 13:54 ` Bertrand Marquis
2021-12-10 16:41 ` Rob Herring
2021-12-16 21:51 ` Stefano Stabellini
2021-12-16 22:02 ` [PATCH V4 0/6] xen: Add support of extended regions (safe ranges) on Arm Oleksandr
2021-12-17 19:13 ` Boris Ostrovsky
2021-12-17 19:19 ` Oleksandr
2021-12-17 19:23 ` Boris Ostrovsky
2021-12-17 19:17 ` Boris Ostrovsky
2022-01-07 11:31 ` Juergen Gross
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