From: Penny Zheng <Penny.Zheng@arm.com>
To: Julien Grall <julien@xen.org>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"sstabellini@kernel.org" <sstabellini@kernel.org>
Cc: Bertrand Marquis <Bertrand.Marquis@arm.com>,
Wei Chen <Wei.Chen@arm.com>, nd <nd@arm.com>
Subject: RE: [PATCH V4 03/10] xen/arm: handle static memory in dt_unreserved_regions
Date: Mon, 16 Aug 2021 06:00:58 +0000 [thread overview]
Message-ID: <VE1PR08MB5215A60D3603AA8D48128F67F7FD9@VE1PR08MB5215.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <c861b7c0-e894-61d0-8b29-77c1753661ee@xen.org>
Hi Julien
> -----Original Message-----
> From: Julien Grall <julien@xen.org>
> Sent: Wednesday, August 11, 2021 9:48 PM
> To: Penny Zheng <Penny.Zheng@arm.com>; xen-devel@lists.xenproject.org;
> sstabellini@kernel.org
> Cc: Bertrand Marquis <Bertrand.Marquis@arm.com>; Wei Chen
> <Wei.Chen@arm.com>; nd <nd@arm.com>
> Subject: Re: [PATCH V4 03/10] xen/arm: handle static memory in
> dt_unreserved_regions
>
> Hi Penny,
>
> On 28/07/2021 11:27, Penny Zheng wrote:
> > static memory regions overlap with memory nodes. The overlapping
> > memory is reserved-memory and should be handled accordingly:
> > dt_unreserved_regions should skip these regions the same way they are
> > already skipping mem-reserved regions.
> >
> > Signed-off-by: Penny Zheng <penny.zheng@arm.com>
> > ---
> > xen/arch/arm/setup.c | 47 ++++++++++++++++++++++++++++----------------
> > 1 file changed, 30 insertions(+), 17 deletions(-)
> >
> > diff --git a/xen/arch/arm/setup.c b/xen/arch/arm/setup.c index
> > 63a908e325..f569134317 100644
> > --- a/xen/arch/arm/setup.c
> > +++ b/xen/arch/arm/setup.c
> > @@ -200,6 +200,13 @@ static void __init dt_unreserved_regions(paddr_t s,
> paddr_t e,
> > int first)
> > {
> > int i, nr = fdt_num_mem_rsv(device_tree_flattened);
> > + /*
> > + * There are two types of reserved memory stored in bootinfo, one
> defines
> > + * in /reserved-memory node, the other refers to domain on static
> allocation
> > + * through "xen,static-mem" property.
> > + */
> > + int nr_rsv_type = 2, t = 0, prev_nr;
> > + struct meminfo *rsv_type[2] = {&bootinfo.reserved_mem,
> > + &bootinfo.static_mem};
>
> Looking at the rest of the series, it doesn't look like there is a real benefits to
> have the static memory and reserved memory in separate arrays as they are
> walked only a few times and they are both meant to be small. In fact, I think
> this code is lot more difficult to read.
>
> So it would be best to merge the two arrays in one. We can add a flag in the
> structure to differentiate between "static" and "reserved" memory.
>
How about adding a "static" flag in "struct meminfo" to tell. See the below example:
"
struct meminfo {
int nr_banks;
struct membank bank[NR_MEM_BANKS];
bool static; /* whether memory is reserved as static memory. */
};
"
And I will delete "struct meminfo static_mem" array, all "static" and "reserved" memory
will be stored in one "struct meminfo reserved_mem" array.
> Cheers,
>
> --
Cheers,
--
> Julien Grall
next prev parent reply other threads:[~2021-08-16 6:01 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-28 10:27 [PATCH V4 00/10] Domain on Static Allocation Penny Zheng
2021-07-28 10:27 ` [PATCH V4 01/10] xen/arm: introduce domain " Penny Zheng
2021-08-11 13:32 ` Julien Grall
2021-08-16 5:21 ` Penny Zheng
2021-08-16 17:27 ` Julien Grall
2021-08-17 2:28 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 02/10] xen/arm: introduce new helper device_tree_get_meminfo Penny Zheng
2021-08-11 13:35 ` Julien Grall
2021-08-16 5:27 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 03/10] xen/arm: handle static memory in dt_unreserved_regions Penny Zheng
2021-08-11 13:48 ` Julien Grall
2021-08-16 6:00 ` Penny Zheng [this message]
2021-08-16 17:33 ` Julien Grall
2021-07-28 10:27 ` [PATCH V4 04/10] xen: introduce mark_page_free Penny Zheng
2021-08-11 14:08 ` Julien Grall
2021-07-28 10:27 ` [PATCH V4 05/10] xen/arm: static memory initialization Penny Zheng
2021-08-04 15:54 ` Jan Beulich
2021-08-13 12:20 ` Julien Grall
2021-08-16 6:12 ` Penny Zheng
2021-08-13 12:38 ` Julien Grall
2021-08-16 7:00 ` Wei Chen
2021-07-28 10:27 ` [PATCH V4 06/10] xen/arm: introduce PGC_reserved Penny Zheng
2021-08-13 12:21 ` Julien Grall
2021-08-16 6:13 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 07/10] xen: re-define assign_pages and introduce assign_page Penny Zheng
2021-08-05 6:34 ` Jan Beulich
2021-08-13 12:27 ` Julien Grall
2021-08-13 12:32 ` Jan Beulich
2021-08-17 8:21 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 08/10] xen/arm: introduce acquire_staticmem_pages and acquire_domstatic_pages Penny Zheng
2021-08-05 6:52 ` Jan Beulich
2021-08-13 13:00 ` Julien Grall
2021-08-16 6:43 ` Penny Zheng
2021-08-16 17:43 ` Julien Grall
2021-08-17 2:33 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 09/10] xen/arm: check "xen,static-mem" property during domain construction Penny Zheng
2021-08-13 13:12 ` Julien Grall
2021-08-16 6:53 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 10/10] xen/arm: introduce allocate_static_memory Penny Zheng
2021-08-13 13:36 ` Julien Grall
2021-08-16 7:51 ` Penny Zheng
2021-08-16 17:55 ` Julien Grall
2021-08-17 2:36 ` Penny Zheng
2021-07-28 10:27 ` [PATCH V4 04/10] xen: introduce mark_page_free Penny Zheng
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