From: Avi Kivity <avi@redhat.com>
To: Sasha Levin <levinsasha928@gmail.com>
Cc: Pekka Enberg <penberg@kernel.org>, cam <cam@cs.ualberta.ca>,
qemu-devel <qemu-devel@nongnu.org>,
David Evensky <evensky@dancer.ca.sandia.gov>,
kvm <kvm@vger.kernel.org>
Subject: Re: [Qemu-devel] Questions regarding ivshmem spec
Date: Thu, 25 Aug 2011 17:00:14 +0300 [thread overview]
Message-ID: <4E56556E.1080805@redhat.com> (raw)
In-Reply-To: <1314278954.3692.55.camel@lappy>
On 08/25/2011 04:29 PM, Sasha Levin wrote:
> 2. The spec describes DOORBELL as an array of DWORDs, when one guest
> wants to poke a different guest it would write something into the offset
> of the other guest in the DOORBELL array.
> Looking at the implementation in QEMU, DOORBELL is one DWORD, when
> writing to it the upper WORD is the guest id and the lower WORD is the
> value.
> What am I missing here?
>
The spec in qemu.git is accurate. The intent is to use an ioeventfd
bound into an irqfd so a write into the doorbell injects an interrupt
directly into the other guest, without going through qemu^Wkvm tool.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2011-08-25 14:00 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-25 13:29 [Qemu-devel] Questions regarding ivshmem spec Sasha Levin
2011-08-25 14:00 ` Avi Kivity [this message]
2011-08-25 14:39 ` Sasha Levin
2011-08-25 14:40 ` Avi Kivity
2011-08-25 14:42 ` Sasha Levin
2011-08-29 15:25 ` Sasha Levin
2011-08-29 18:15 ` Cam Macdonell
2011-08-30 17:37 ` Cam Macdonell
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