lkml.org 
[lkml]   [2009]   [Jun]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [KVM PATCH v8 3/3] KVM: add iosignalfd support
On 06/23/2009 11:56 AM, 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.
>

Userspace could create an eventfd for this control queue and wait for it
to fire.

--
error compiling committee.c: too many arguments to function



\
 
 \ /
  Last update: 2009-06-23 11:59    [W:0.123 / U:2.640 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site