From: Julien Grall <julien@xen.org>
To: Jan Beulich <jbeulich@suse.com>
Cc: iwj@xenproject.org, wl@xen.org, andrew.cooper3@citrix.com,
george.dunlap@citrix.com, sstabellini@kernel.org,
jgross@suse.com, christian.lindig@citrix.com, dave@recoil.org,
xen-devel@lists.xenproject.org,
Igor Druzhinin <igor.druzhinin@citrix.com>
Subject: Re: [PATCH] tools/libxc: use uint32_t for pirq in xc_domain_irq_permission
Date: Wed, 7 Jul 2021 13:59:24 +0100 [thread overview]
Message-ID: <927c1c59-734a-4013-9286-137fd7026c26@xen.org> (raw)
In-Reply-To: <5e454ba6-3d3f-9402-140d-f576f9124402@suse.com>
On 07/07/2021 13:54, Jan Beulich wrote:
> On 07.07.2021 14:51, Julien Grall wrote:
>> On 07/07/2021 02:02, Igor Druzhinin wrote:
>>> Current unit8_t for pirq argument in this interface is too restrictive
>>> causing failures on modern hardware with lots of GSIs. That extends down to
>>> XEN_DOMCTL_irq_permission ABI structure where it needs to be fixed up
>>> as well. Internal Xen structures appear to be fine. Existing users of
>>> the interface in tree (libxl, ocaml and python bindings) are already using
>>> int for pirq representation that should be wide enough.
>>
>> By "int", I am assuming you imply "signed int", is that correct?
>>
>> If so, should the function xc_domain_irq_permission() interface take an
>> int in parameter and check it is not negative?
>
> Please let's not make things worse than they are, the more that
Well, what I am trying to prevent is surprise where the caller
mistakenly pass a negative value that will be interpreted as a positive
value...
Such issues are beyong annoying to debug...
> ./CODING_STYLE is unambiguous in cases like this one.
Hmmm... The coding style mention the fixed size but nothing about the
signedness of the type...
The alternative suggestion is to keep a unsigned type but check the bit
31 is not set.
Cheers,
--
Julien Grall
next prev parent reply other threads:[~2021-07-07 12:59 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-07 1:02 [PATCH] tools/libxc: use uint32_t for pirq in xc_domain_irq_permission Igor Druzhinin
2021-07-07 7:46 ` Jan Beulich
2021-07-07 9:19 ` Andrew Cooper
2021-07-08 1:08 ` Igor Druzhinin
2021-07-08 1:11 ` Andrew Cooper
2021-07-08 1:14 ` Igor Druzhinin
2021-07-08 1:26 ` Andrew Cooper
2021-07-08 1:30 ` Igor Druzhinin
2021-07-07 8:48 ` Christian Lindig
2021-07-07 12:51 ` Julien Grall
2021-07-07 12:54 ` Jan Beulich
2021-07-07 12:59 ` Julien Grall [this message]
2021-07-07 13:14 ` Jan Beulich
2021-07-07 13:21 ` Julien Grall
2021-07-07 13:25 ` Jan Beulich
2021-07-08 2:06 ` Igor Druzhinin
2021-07-12 8:59 ` Julien Grall
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