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RE: [PATCH 2/9] xen/arm: introduce PGC_reserved
- To: Julien Grall <julien@xxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>, "sstabellini@xxxxxxxxxx" <sstabellini@xxxxxxxxxx>, "jbeulich@xxxxxxxx" <jbeulich@xxxxxxxx>
- From: Penny Zheng <Penny.Zheng@xxxxxxx>
- Date: Mon, 5 Jul 2021 03:09:31 +0000
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- Cc: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Wei Chen <Wei.Chen@xxxxxxx>
- Delivery-date: Mon, 05 Jul 2021 03:09:57 +0000
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- Thread-topic: [PATCH 2/9] xen/arm: introduce PGC_reserved
Hi Julien
Sorry for so long to respond, just back from a long holiday. 😉
> -----Original Message-----
> From: Julien Grall <julien@xxxxxxx>
> Sent: Thursday, July 1, 2021 1:44 AM
> To: Penny Zheng <Penny.Zheng@xxxxxxx>; xen-devel@xxxxxxxxxxxxxxxxxxxx;
> sstabellini@xxxxxxxxxx; jbeulich@xxxxxxxx
> Cc: Bertrand Marquis <Bertrand.Marquis@xxxxxxx>; Wei Chen
> <Wei.Chen@xxxxxxx>
> Subject: Re: [PATCH 2/9] xen/arm: introduce PGC_reserved
>
> Hi Penny,
>
> On 07/06/2021 03:43, Penny Zheng wrote:
> > In order to differentiate pages of static memory, from those allocated
> > from heap, this patch introduces a new page flag PGC_reserved to tell.
>
> I would prefer if this patch is folded in the patch first using it. This will
> be
> easier to understand how this flag will be used.
>
> Cheers,
Sure, I'll re-organize this commit.
>
> >
> > Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
> > ---
> > changes v2:
> > - remove unused reserved field in struct page_info
> > - remove unused helper page_get_reserved_owner and
> > page_set_reserved_owner
> > ---
> > xen/include/asm-arm/mm.h | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/xen/include/asm-arm/mm.h b/xen/include/asm-arm/mm.h
> index
> > 0b7de3102e..7034fae1b6 100644
> > --- a/xen/include/asm-arm/mm.h
> > +++ b/xen/include/asm-arm/mm.h
> > @@ -108,6 +108,9 @@ struct page_info
> > /* Page is Xen heap? */
> > #define _PGC_xen_heap PG_shift(2)
> > #define PGC_xen_heap PG_mask(1, 2)
> > + /* Page is reserved */
> > +#define _PGC_reserved PG_shift(3)
> > +#define PGC_reserved PG_mask(1, 3)
> > /* ... */
> > /* Page is broken? */
> > #define _PGC_broken PG_shift(7)
> >
>
> --
> Julien Grall
Cheers
--
Penny Zheng
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