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Re: [PATCH v2 (resend) 01/27] xen/vmap: Check the page has been mapped in vm_init_type()
- To: Elias El Yandouzi <eliasely@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 25 Jan 2024 17:14:24 +0100
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- Cc: julien@xxxxxxx, pdurrant@xxxxxxxxxx, dwmw@xxxxxxxxxx, Julien Grall <jgrall@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 25 Jan 2024 16:14:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.01.2024 20:25, Elias El Yandouzi wrote:
> From: Julien Grall <jgrall@xxxxxxxxxx>
>
> The function map_pages_to_xen() could fail if it can't allocate the
> underlying page tables or (at least on Arm) if the area was already
> mapped.
>
> The first error is caught by clear_page() because it would fault.
> However, the second error while very unlikely is not caught at all.
>
> As this is boot code, use BUG_ON() to check if map_pages_to_xen() has
> succeeded.
>
> Signed-off-by: Julien Grall <jgrall@xxxxxxxxxx>
> Signed-off-by: Elias El Yandouzi <eliasely@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
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