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Re: [MINI-OS PATCH] e820: fix e820_get_reserved_pfns() to reserve page aligned area
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 14 Jul 2025 16:02:25 +0200
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- Cc: samuel.thibault@xxxxxxxxxxxx, minios-devel@xxxxxxxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 14 Jul 2025 14:02:42 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.07.2025 14:03, Juergen Gross wrote:
> e820_get_reserved_pfns() needs to make sure to reserve only page
> aligned memory areas.
>
> Fixes: a7d27a7332ba ("mini-os: add memory map service functions")
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
I've committed this, but ...
> --- a/e820.c
> +++ b/e820.c
> @@ -365,7 +365,7 @@ unsigned long e820_get_reserved_pfns(int pages)
> unsigned long last = 0, needed = (long)pages << PAGE_SHIFT;
>
> for ( i = 0; i < e820_entries && e820_map[i].addr < last + needed; i++ )
> - last = e820_map[i].addr + e820_map[i].size;
> + last = round_pgup(e820_map[i].addr + e820_map[i].size);
>
> if ( i == 0 || e820_map[i - 1].type != E820_TYPE_SOFT_RESERVED )
> e820_insert_entry_at(i, last, needed, E820_TYPE_SOFT_RESERVED);
... I had to resolve fuzz here: There's no E820_TYPE_SOFT_RESERVED in the
upstream tree, afaics. I just hope I didn't screw up ...
Jan
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