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Re: [PATCH 2/2] common: Make livepatch dependent on HAS_VMAP
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: "Orzel, Michal" <michal.orzel@xxxxxxx>
- Date: Thu, 31 Jul 2025 13:10:15 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 31 Jul 2025 11:10:25 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 31/07/2025 10:22, Jan Beulich wrote:
> On 31.07.2025 10:05, Michal Orzel wrote:
>> It should not be possible to select and build livepatch if HAS_VMAP is
>> not selected. This is the case on MPU systems.
>>
>> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
>
> I agree this is necessary for now, so
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> But in principle live-patching ought to be possible without MMU as well,
> just that the code will need suitably enabling? If so, it would be nice
> if the description could somehow express this.
Yes, I agree that it can be enabled in the future with some additional changes.
I can tweak commit msg when committing:
"While technically possible to support live-patching on MPU systems, today the
code depends on vmap. However, this relationship is not reflected in Kconfig
and allows to enable live-patching on MPU, where HAS_VMAP is not selected."
~Michal
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