linux-kernel - Re: [KVM PATCH v8 3/3] KVM: add iosignalfd support

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Message-ID: <4A40D6FD.8000903@novell.com>
Date:	Tue, 23 Jun 2009 09:22:05 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
CC:	kvm@...r.kernel.org, linux-kernel@...r.kernel.org, avi@...hat.com,
	mtosatti@...hat.com, paulmck@...ux.vnet.ibm.com, markmc@...hat.com
Subject: Re: [KVM PATCH v8 3/3] KVM: add iosignalfd support

Michael S. Tsirkin wrote:
> On Thu, Jun 18, 2009 at 08:30:46PM -0400, Gregory Haskins wrote:
>   
>> +static int
>> +iosignalfd_group_in_range(struct kvm_io_device *this, gpa_t addr, int len,
>> +			  int is_write)
>> +{
>> +	struct _iosignalfd_group *p = to_group(this);
>> +
>> +	return ((addr >= p->addr && (addr < p->addr + p->length)));
>> +}
>>     
>
> I think I see a problem here. For virtio, we do not necessarily want all
> virtqueues for a device to live in kernel: there might be control
> virtqueues that we want to leave in userspace. Since this claims all
> writes to a specific address, the signal never makes it to userspace.
>
>   
So based on this, I think you are right about the io_bus changes.  If we
accept your proposal this problem above is solved cleanly.  Sorry for
the resistance, but I just wanted to make sure we were doing the right
thing.  I am in agreement now.

Kind Regards,
-Greg


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