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RE: [PATCH] xen/arm: p2m: Populate pages for GICv2 mapping in arch_domain_create()
- To: Jan Beulich <jbeulich@xxxxxxxx>, Julien Grall <julien@xxxxxxx>
- From: Henry Wang <Henry.Wang@xxxxxxx>
- Date: Thu, 13 Oct 2022 11:05:44 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Wei Chen <Wei.Chen@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 13 Oct 2022 11:06:04 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH] xen/arm: p2m: Populate pages for GICv2 mapping in arch_domain_create()
Hi Jan
> -----Original Message-----
> From: Jan Beulich <jbeulich@xxxxxxxx>
> Subject: Re: [PATCH] xen/arm: p2m: Populate pages for GICv2 mapping in
> arch_domain_create()
>
> On 13.10.2022 12:58, Julien Grall wrote:
> > On 13/10/2022 10:21, Henry Wang wrote:
> >>> -----Original Message-----
> >>> From: Julien Grall <julien@xxxxxxx>
> >>> Subject: Re: [PATCH] xen/arm: p2m: Populate pages for GICv2 mapping
> in
> >>> arch_domain_create()
> >>>
> >>> On 13/10/2022 09:38, Henry Wang wrote:
> >>>> Hardware using GICv2 needs to create a P2M mapping of 8KB GICv2
> area
> >>>> when the domain is created. Considering the worst case of page tables
> >>>
> >>> Can you describe in the commit message what is the worst case scenario?
> >>
> >> The two pages will be consecutive but not necessarily in the same L3 page
> >> table so the worst case is 4 + 2, is that correct?
> >
> > So I agree that the worse case is 6. But I don't understand what you
> > mean by '4 + 2' here.
>
> Assuming you have 4 (N) page table levels, isn't it 7 (1 + 2 * (N - 1))?
> Or is the root table not taken from the p2m pool?
Correct, on arm the root is not taken from the pool.
Kind regards,
Henry
>
> Jan
|
