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Re: [PATCH] docs: correct "gnttab=" documented default
- To: Julien Grall <julien@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 28 Feb 2022 15:32:18 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 28 Feb 2022 14:32:43 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 28.02.2022 15:02, Julien Grall wrote:
> On 28/02/2022 10:19, Jan Beulich wrote:
>> Defaults differ for Arm and x86, not the least because of v2 not even
>> being security supported on Arm.
>>
>> Also drop a bogus sentence from gnttab_max_maptrack_frames, which was
>> presumably mistakenly cloned from gnttab_max_frames (albeit even there
>> what is being said is neither very precise nor very useful imo).
>>
>> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
>>
>> --- a/docs/misc/xen-command-line.pandoc
>> +++ b/docs/misc/xen-command-line.pandoc
>> @@ -1177,7 +1177,8 @@ Specify which console gdbstub should use
>> ### gnttab
>> > `= List of [ max-ver:<integer>, transitive=<bool>, transfer=<bool> ]`
>>
>> -> Default: `gnttab=max-ver:2,transitive,transfer`
>> +> Default (Arm): `gnttab=max-ver:1`
>> +> Default (x86): `gnttab=max-ver:2,transitive,transfer`
>
> AFAICT, the default would not be correct on x86 when CONFIG_PV=n because
> transfer is not available.
I can certainly split it in two x86 lines, one for PV and one for HVM.
I would not have thought I need to go that far, though.
Jan
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