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Re: [PATCH v2] xen/mm: Introduce per-arch pte_attr_t type for PTE flags
- To: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 6 Feb 2025 13:34:04 +0100
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- Cc: tpearson@xxxxxxxxxxxxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>, Marek Marczykowski-Górecki <marmarek@xxxxxxxxxxxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 06 Feb 2025 12:34:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.02.2025 13:29, Jan Beulich wrote:
> On 05.02.2025 22:02, Shawn Anastasio wrote:
>> Xen's memory management APIs map_pages_to_xen, modify_xen_mappings,
>> set_fixmap, ioremap_attr, and __vmap all use an unsigned int to
>> represent architecture-dependent page table entry flags. This assumption
>> is not well-suited for PPC/radix where some flags go past 32-bits, so
>> introduce the pte_attr_t type to allow architectures to opt in to larger
>> types to store PTE flags.
>>
>> Suggested-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
>> Signed-off-by: Shawn Anastasio <sanastasio@xxxxxxxxxxxxxxxxxxxxx>
>> ---
>> Changes in v2:
>> - Drop Kconfig option and use `#define pte_attr_t pte_attr_t` for arches to
>> opt-in to defining the type.
>> - Move default pte_attr_definition to xen/types.h
>
> I'm unconvinced of types.h being an appropriate place for something mm-
> related. mm-types.h maybe?
To add to this (in an attempt to keep you from introducing a header of this
name, just to then include it from types.h): I don't think this type wants
exposing to all CUs. Ones entirely unrelated to mm (take e.g. everything
that's under lib/) shouldn't get to see it.
Jan
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