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From: Gregory Haskins <gregory.haskins@gmail.com>
To: "Jayaraman, Bhaskar" <Bhaskar.Jayaraman@lsi.com>
Cc: "Kumar, Venkat" <Venkat.Kumar@lsi.com>,
	Cam Macdonell <cam@cs.ualberta.ca>,
	"kvm@vger.kernel.org list" <kvm@vger.kernel.org>
Subject: Re: [PATCH v2] Shared memory device with interrupt support
Date: Tue, 19 May 2009 07:35:44 -0400	[thread overview]
Message-ID: <4A129990.80603@gmail.com> (raw)
In-Reply-To: <F4789BF54654AC44982AC0ED2DE2E64B2CD1FC8D47@inbmail01.lsi.com>

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Jayaraman, Bhaskar wrote:
> Cam, is it somehow possible to generate a local APIC interrupt from one VM to another? I guess it shouldn't be as the LAPIC interrupts generated in one VM will go to the VCPUs of the same VM...
> Regards,
> Bhaskar.
>   

The closest thing to this is the irqfd+iosignalfd thing I mentioned the
other day.  With this model, a PIO/MMIO write in the src guest will
directly inject an interrupt into the dst guest's LAPIC.  However, as
Avi points out, this is just an optimization.  You can also do it by
first taking a hop through each guests userspace as well.

HTH
-Greg



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  reply	other threads:[~2009-05-19 11:35 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <3D9CB4061D1EB3408D4A0B910433453C030BCA8892@inbmail01.lsi.com>
2009-05-16  3:30 ` [PATCH v2] Shared memory device with interrupt support Cam Macdonell
2009-05-17 21:51   ` Avi Kivity
2009-05-18 11:12     ` Gregory Haskins
2009-05-18 11:38       ` Avi Kivity
2009-05-18 16:50     ` Cam Macdonell
2009-05-18 17:19       ` Avi Kivity
2009-05-18 12:11   ` Kumar, Venkat
2009-05-18 16:20     ` Cam Macdonell
2009-05-19  3:52       ` Kumar, Venkat
2009-05-19 11:20         ` Jayaraman, Bhaskar
2009-05-19 11:35           ` Gregory Haskins [this message]
2009-05-07 16:16 Cam Macdonell
2009-05-16  2:45 ` Kumar, Venkat
2009-05-16  3:27   ` Cam Macdonell
2009-05-17 21:39     ` Avi Kivity
2009-05-18 18:54 ` Anthony Liguori
2009-05-19  4:31   ` Avi Kivity
2009-05-19 18:31     ` Anthony Liguori
2009-05-20  9:01       ` Avi Kivity
2009-05-20 13:45         ` Anthony Liguori
2009-05-20 14:26           ` Avi Kivity

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