linux-kernel - Re: [KVM PATCH v2 4/4] kvm: add iosignalfd support

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Date:	Sun, 17 May 2009 22:37:09 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Avi Kivity <avi@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [KVM PATCH v2 4/4] kvm: add iosignalfd support

Avi Kivity wrote:
> Gregory Haskins wrote:
>> +
>> +struct _iosignalfd {
>>   
>
> Why the underscore?  It's unorthodox for a structure.

I tend to do that to denote "this is a private structure", but it makes
more sense if we are building a factory interface for a corresponding
public version of the structure of the same name.  In this case, I do
not think I was using that pattern, but old habits die hard. ;)  I will
get rid of this extra underscore in the next rev.

>
>
>> +    u64                  cookie;
>> +    u64                  addr;
>> +    size_t               length;
>> +    struct file         *file;
>> +    struct list_head     list;
>> +    struct kvm_io_device dev;
>> +};
>>   
>
> How will that work with multiple identical addresses and different
> cookies?  Will the code iterate over all of them and just fire for one?
Yeah, primarily because I think the io_bus code will stop once it finds
the first in_range() match.  But I put this logic in anyway in
preparation for the future when we may perhaps support such a notion
(similar to what you had me do with the irqfd side).

-Greg



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