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Re: [Xen-devel] [PATCH v3 1/7] docs: Improve documentation for dom0= and dom0-iommu=
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 16 Jan 2019 19:51:33 +0000
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- Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Roger Pau Monne <roger.pau@xxxxxxxxxx>
- Delivery-date: Wed, 16 Jan 2019 19:52:01 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 16/01/2019 11:52, Jan Beulich wrote:
>>>> On 16.01.19 at 10:00, <andrew.cooper3@xxxxxxxxxx> wrote:
>> --- a/docs/misc/xen-command-line.pandoc
>> +++ b/docs/misc/xen-command-line.pandoc
>> @@ -636,61 +636,83 @@ trace feature is only enabled in debugging builds of
>> Xen.
>>
>> Specify the bit width of the DMA heap.
>>
>> -### dom0 (x86)
>> -> `= List of [ pvh | shadow | verbose ]`
>> +### dom0
>> + = List of [ pvh=<bool>, shadow=<bool>, verbose=<bool> ]
>>
>> -> Sub-options:
>> + Applicability: x86
>>
>> -> `pvh`
>> +Controls for how dom0 is constructed on x86 systems.
>>
>> -> Default: `false`
>> +* The `pvh` boolean controls whether dom0 is constructed as a PV or a PVH
>> + guest. The default is PV. In addition, the following requirements must
>> + be met:
>>
>> -Flag that makes a dom0 boot in PVHv2 mode.
>> + * The dom0 kernel selected by the boot loader must be capable of the
>> + selected mode.
>> + * For a PV dom0, Xen must have been compiled with `CONFIG_PV` enabled.
>> + * For a PVH dom0, Xen must have been compiled with `CONFIG_HVM`
>> enabled,
>> + and the hardware must have VT-x/SVM extensions available.
>>
>> -> `shadow`
>> +* The `shadow` boolean is only applicable when dom0 is constructed as a
>> PVH
>> + guest, and controls whether dom0 uses hardware assisted paging, or
>> shadow
>> + paging. The default is HAP when available, and shadow otherwise.
>>
>> -> Default: `false`
>> + This option is unavailable when `CONFIG_SHADOW_PAGING` is compiled out.
>> A
>> + PVH dom0 cannot be used if `CONFIG_SHADOW_PAGING` is compiled out, and
>> the
>> + hardware is not HAP-capable.
> As mentioned elsewhere, I object to adding CONFIG_* into this doc,
> which is intended to be meaningful to non-developers. But not to the
> degree of NAK-ing the whole thing, if everyone else disagrees with me.
I'm not sure what else to say. I object to purposefully omitting
relevant information from our documentation.
Most people reading it, including non-developers, will know what Kconfig
is and how to check, owing to at least a basic knowledge of Linux.
Those that don't will be capable of basic human interaction such as
asking a question of someone more knowledgeable.
~Andrew
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