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Re: [PATCH v8 3/4] xen/arm: account IO handler for emulated PCI host bridge
- To: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>
- From: Rahul Singh <Rahul.Singh@xxxxxxx>
- Date: Thu, 9 Dec 2021 10:19:09 +0000
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- Cc: xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "oleksandr_tyshchenko@xxxxxxxx" <oleksandr_tyshchenko@xxxxxxxx>, "volodymyr_babchuk@xxxxxxxx" <volodymyr_babchuk@xxxxxxxx>, "artem_mygaiev@xxxxxxxx" <artem_mygaiev@xxxxxxxx>, Bertrand Marquis <Bertrand.Marquis@xxxxxxx>, Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>
- Delivery-date: Thu, 09 Dec 2021 10:19:58 +0000
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- Thread-topic: [PATCH v8 3/4] xen/arm: account IO handler for emulated PCI host bridge
Hi Oleksandr,
> On 9 Dec 2021, at 7:29 am, Oleksandr Andrushchenko <andr2000@xxxxxxxxx> wrote:
>
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
>
> At the moment, we always allocate an extra 16 slots for IO handlers
> (see MAX_IO_HANDLER). So while adding an IO trap handler for the emulated
> PCI host bridge we are not breaking anything, but we have a latent bug
> as the maximum number of IOs may be exceeded.
> Fix this by explicitly telling that we have an additional IO handler, so it is
> accounted.
>
> Fixes: d59168dc05a5 ("xen/arm: Enable the existing x86 virtual PCI support
> for ARM")
>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
Reviewed-by: Rahul Singh <rahul.singh@xxxxxxx>
Tested-by: Rahul Singh <rahul.singh@xxxxxxx>
Regards,
Rahul
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