Re: [PATCH v3 11/13] x86/xen: use lazy_mmu_state when context-switching

David Woodhouse
2025-10-24T14:47:52Z

[-- Attachment #1: Type: text/plain, Size: 850 bytes --]

On Thu, 2025-10-23 at 22:06 +0200, David Hildenbrand wrote:
> On 15.10.25 10:27, Kevin Brodsky wrote:
> > We currently set a TIF flag when scheduling out a task that is in
> > lazy MMU mode, in order to restore it when the task is scheduled
> > again.
> >
> > The generic lazy_mmu layer now tracks whether a task is in lazy MMU
> > mode in task_struct::lazy_mmu_state. We can therefore check that
> > state when switching to the new task, instead of using a separate
> > TIF flag.
> >
> > Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com>
> > ---
>
>
> Looks ok to me, but I hope we get some confirmation from x86 / xen
> folks.

I know tglx has shouted at me in the past for precisely this reminder,
but you know you can test Xen guests under QEMU/KVM now and don't need
to actually run Xen? Has this been boot tested?

[-- Attachment #2: smime.p7s --]
[-- Type: application/pkcs7-signature, Size: 5069 bytes --]