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Re: [PATCH 1/8] x86/boot: Drop incorrect mapping at l2_xenmap[0]
- To: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 30 Nov 2021 11:33:09 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Tue, 30 Nov 2021 10:33:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.11.2021 11:04, Andrew Cooper wrote:
> It has been 4 years since the default load address changed from 1M to 2M, and
> _stext ceased residing in l2_xenmap[0]. We should not be inserting an unused
> mapping.
>
> To ensure we don't create mappings accidentally, loop from 0 and obey
> _PAGE_PRESENT on all entries.
>
> Fixes: 7ed93f3a0dff ("x86: change default load address from 1 MiB to 2 MiB")
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
I guess this may be worth backporting despite not having any immediate
adverse effect.
Jan
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