From: Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
To: Anthony Liguori <aliguori-r/Jw6+rmf7HQT0dZR+AlfA@public.gmane.org>
Cc: kvm-devel <kvm-devel-TtF/mJH4Jtrk1uMJSBkQmQ@public.gmane.org>
Subject: Re: Userspace hypercalls?
Date: Mon, 27 Aug 2007 19:47:22 +0300 [thread overview]
Message-ID: <46D3001A.9070706@qumranet.com> (raw)
In-Reply-To: <46D2FCE1.7020605-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
Avi Kivity wrote:
>
> Thinking a little more about this, it isn't about handling hypercalls
> in userspace, but about handling a virtio sync() in userspace.
>
> So how about having a KVM_HC_WAKE_CHANNEL hypercall (similar to Xen's
> event channel, but assymetric) that has a channel parameter. The
> kernel handler for that hypercall dispatches calls to either a kernel
> handler or a userspace handler. That means we don't need a separate
> ETH_SEND, ETH_RECEIVE, or BLOCK_SEND hypercalls.
And thinking a tiny little bit more about this, we can have the kernel
(optionally) fire an eventfd, so a separate userspace thread or process
can be woken up to service the device, without a heavyweight exit.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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next prev parent reply other threads:[~2007-08-27 16:47 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-27 15:27 Userspace hypercalls? Anthony Liguori
2007-08-27 16:16 ` Avi Kivity
[not found] ` <46D2F8FA.6050104-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-08-27 16:19 ` Avi Kivity
2007-08-27 16:33 ` Avi Kivity
[not found] ` <46D2FCE1.7020605-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-08-27 16:47 ` Avi Kivity [this message]
[not found] ` <46D3001A.9070706-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-08-27 17:32 ` Anthony Liguori
2007-08-27 17:36 ` Avi Kivity
[not found] ` <46D30BAE.4080705-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-08-27 17:47 ` Anthony Liguori
[not found] ` <46D30F15.6050601@qumranet.com>
[not found] ` <46D30F15.6050601-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-08-27 19:58 ` Luca
[not found] ` <68676e00708271258o278de93ek8a051619dd03fb6a-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2007-08-27 20:01 ` Avi Kivity
[not found] ` <46D32DA8.1080900-atKUWr5tajBWk0Htik3J/w@public.gmane.org>
2007-08-27 21:06 ` Anthony Liguori
2007-08-29 6:59 ` Dor Laor
[not found] ` <64F9B87B6B770947A9F8391472E032160D6558D8-yEcIvxbTEBqsx+V+t5oei8rau4O3wl8o3fe8/T/H7NteoWH0uzbU5w@public.gmane.org>
2007-08-29 21:24 ` Avi Kivity
[not found] <46D326020200005A00029BFF@mcclure.wal.novell.com>
[not found] ` <46D326080200005A00029C02-Igcdv/6uVdMHoYOw/+koYqIwWpluYiW7@public.gmane.org>
2007-08-27 23:29 ` Gregory Haskins
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