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Re: [Xen-devel] [PATCH v3 7/7] xen/dom0: Add a dom0-iommu=none option
- To: Jan Beulich <JBeulich@xxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 22 Jan 2019 13:42:06 +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: Tue, 22 Jan 2019 13:42:54 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 22/01/2019 08:06, Jan Beulich wrote:
>>>> On 21.01.19 at 19:08, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 17/01/2019 13:35, Jan Beulich wrote:
>>>>>> On 16.01.19 at 10:00, <andrew.cooper3@xxxxxxxxxx> wrote:
>>>> @@ -709,6 +709,12 @@ Controls for the dom0 IOMMU setup.
>>>> This option is enabled by default on x86 systems, and invalid on ARM
>>>> systems.
>>>>
>>>> +* The `none` option is intended for development purposes only, and skips
>>>> + certain safety checks pertaining to the correct IOMMU configuration
>>>> for
>>>> + dom0 to boot.
>>> Would you mind inserting "PVH" ahead of "dom0"?
>> That would result in an inaccurate description of the functionality.
>> check_hwdom_reqs() is not specific to PVH guests.
> How is the paging_mode_translate() check your patch actually
> amends not making this function effectively PVH-specific? Or
> are you meaning to imply that some hypothetical future addition
> to the checks affecting PV Dom0 is to be covered here as well?
I expect it is far more likely that the paging_mode_translate() check be
adjusted in the future, than the caller to be modified to exclude PV guests.
>
>>>> @@ -156,7 +159,7 @@ int iommu_domain_init(struct domain *d)
>>>>
>>>> static void __hwdom_init check_hwdom_reqs(struct domain *d)
>>>> {
>>>> - if ( !paging_mode_translate(d) )
>>>> + if ( iommu_hwdom_none || !paging_mode_translate(d) )
>>>> return;
>>> Seeing the __hwdom_init, wouldn't it be better to restrict this
>>> relaxation to Xen boot time created Dom0?
>> No, I don't think so.
>>
>> That would complicate the change (which is already only for use by
>> developers), and unnecessarily prohibit testing of the late hwdom paths.
> Well, I don't fully agree, but okay then. Therefore if the answer
> to the second question above is "yes", then
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Thanks,
~Andrew
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