Re: [PATCH] xen/arm: Fix P2M root page tables invalidation

[Julien Grall <julien@xxxxxxx>]

(+Oleksii)

Hi,

Adding Oleksii for visibility.

On 16/06/2025 07:56, Michal Orzel wrote:
> Fix the condition part of the for loop in p2m_invalidate_root() that
> uses P2M_ROOT_LEVEL instead of P2M_ROOT_PAGES. The goal here is to
> invalidate all root page tables (that can be concatenated), so the loop
> must iterate through all these pages. Root level can be 0 or 1, whereas
> there can be 1,2,8,16 root pages. The issue may lead to some pages
> not being invalidated and therefore the guest access won't be trapped.
> We use it to track pages accessed by guest for set/way emulation provided
> no IOMMU, IOMMU not enabled for the domain or P2M not shared with IOMMU.
>
> Fixes: 2148a125b73b ("xen/arm: Track page accessed between batch of Set/Way 
> operations")
> Signed-off-by: Michal Orzel <michal.orzel@xxxxxxx>
Reviewed-by: Julien Grall <jgrall@xxxxxxxxxx>

Cheers,

--
Julien Grall