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Re: [Xen-devel] [PATCH v3 1/7] docs: Improve documentation for dom0= and dom0-iommu=
- To: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Wed, 16 Jan 2019 19:54:30 +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>, Jan Beulich <JBeulich@xxxxxxxx>
- Delivery-date: Wed, 16 Jan 2019 19:54:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 16/01/2019 10:53, Roger Pau Monné wrote:
> On Wed, Jan 16, 2019 at 09:00:44AM +0000, Andrew Cooper wrote:
>> Update to the latest metadata style, and discuss the options more
>> completely where appropriate.
>>
>> Drop the redundant comment beside parse_dom0_param() - it is already out
>> of sync with the main documentation. Also drop the individual
>> documentation for deprecated options which refer to their newer
>> versions, for the same reason.
>>
>> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> Reviewed-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
>
> Just one comment.
>
> [...]
>> +* The `map-inclusive` boolean is applicable to x86 PV dom0's, and sets up
>> + identity IOMMU mappings for all non-RAM regions below 4GB except for
>> + unusable ranges, and ranges belonging to Xen.
>> +
>> + Typically, some devices in a system use bits of RAM for communication,
>> and
>> + these areas should be listed as reserved in the E820 table and
>> identified
>> + via RMRR or IVMD entries in the APCI tables, so Xen can ensure that they
>> + are identity-mapped in the IOMMU. However, some firmware makes
>> mistakes,
>> + and this option is a coarse-grain workaround for those errors.
>> +
>> + Where possible, finer grain corrections should be made with the `rmrr=`,
>> + `ivrs_hpet=` or `ivrs_ioapic=` command line options.
>> +
>> + This option is enabled by default on x86 systems, and invalid on ARM
>> + systems.
>> +
>> +* The `map-reserved` functionality is very similar to `map-inclusive`,
>> but is
>> + applicable to both x86 PV and PVH dom0's, and represents a subset of the
>> + correction by only mapping reserved memory regions rather than all
>> non-RAM
>> + regions.
> Should you add "This option is enabled by default on x86 systems, and
> invalid on ARM systems." here?
What I listed here where the differences from map-inclusive, so the ARM
bit is covered IMO.
However, this bit of text doesn't survive past patch 6 anyway, so it
really doesn't matter.
~Andrew
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