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Re: [PATCH] cmdline: document "extra_guest_irqs" upper bound
- To: Jan Beulich <jbeulich@xxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 4 Apr 2023 08:09:22 +0100
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- Cc: George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 04 Apr 2023 07:09:46 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 04/04/2023 7:46 am, Jan Beulich wrote:
> PHYSDEVOP_pirq_eoi_gmfn_v<N> accepting just a single GFN implies that no
> more than 32k pIRQ-s can be used by a domain. Document this upper bound.
>
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
> ---
> I was uncertain about also introducing a bounds check in code: We don't
> check for bogus / abusive values elsewhere either.
Normally not, but in this case I suspect it's worth it. Without a
bounds check, don't we risk wandering off the page?
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