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Re: [PATCH 11/22] x86: add a boot option to enable and disable the direct map
- To: Elias El Yandouzi <eliasely@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 16 Jan 2024 09:30:36 +0100
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- Cc: Hongyan Xia <hongyxia@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, Julien Grall <julien@xxxxxxx>
- Delivery-date: Tue, 16 Jan 2024 08:30:47 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 15.01.2024 15:50, Elias El Yandouzi wrote:
> On 12/01/2024 07:47, Jan Beulich wrote:
>> On 11.01.2024 19:25, Elias El Yandouzi wrote:
>>> How would you proceed? Calling vmap() seems to be a bit overkill for
>>> just a temporary mapping and I don't really want to rework this function
>>> to use map_domain_page().
>>>
>>> In such case, how would you proceed? What do you suggest?
>>
>> fixmap may be an option to consider, but I also don't see why you
>> apparently think using vmap() would be a possibility while at the
>> same time making use of map_domain_page() is too much effort.
>
> I thought about using vmap() as it allows to map a contiguous region
> easily. It is also used in the follow-up patch 17/22, so I thought it
> could be viable.
>
> I was reluctant to use map_domain_page() for two reasons. 1) it only
> allows to map one page at the time, so I'd need to rework more deeply
> the function dmi_iterate() 2) because the mapcache wouldn't be ready to
> use at that time, the mapping would end up in PMAP which is meant to map
> the page tables, nothing else.
Oh, right, this makes sense of course.
Jan
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