From: Avi Kivity <avi@qumranet.com>
To: benami@il.ibm.com
Cc: kvm-devel@lists.sourceforge.net, andrea@qumranet.com,
allen.m.kay@intel.com
Subject: Re: [PATCH 1/1] direct mmio for passthrough - kernel part
Date: Tue, 01 Apr 2008 16:30:00 +0300 [thread overview]
Message-ID: <47F238D8.7040608@qumranet.com> (raw)
In-Reply-To: <1207050734-13166-2-git-send-email-benami@il.ibm.com>
benami@il.ibm.com wrote:
> From: Ben-Ami Yassour <benami@il.ibm.com>
>
> Enable a guest to access a device's memory mapped I/O regions directly.
> Userspace sends the mmio regions that the guest can access. On the first
> page fault for an access to an mmio address the host translates the gva to hpa,
> and updates the sptes.
>
>
Can you explain why you're not using the regular memory slot mechanism?
i.e. have userspace mmap(/dev/mem) and create a memslot containing that
at the appropriate guest physical address?
There are some issues with refcounting, but Andrea has some tricks to
deal with that.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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next prev parent reply other threads:[~2008-04-01 13:30 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-01 11:52 [RFC] direct mmio for passthrough benami
2008-04-01 11:52 ` [PATCH 1/1] direct mmio for passthrough - kernel part benami
2008-04-01 13:30 ` Avi Kivity [this message]
2008-04-01 14:42 ` Anthony Liguori
2008-04-01 15:20 ` Anthony Liguori
2008-04-01 17:05 ` Avi Kivity
2008-04-01 18:18 ` Andrea Arcangeli
2008-04-01 18:28 ` Anthony Liguori
2008-04-01 17:03 ` Avi Kivity
2008-04-01 17:18 ` Daniel P. Berrange
2008-04-01 18:10 ` Andrea Arcangeli
2008-04-01 18:18 ` Daniel P. Berrange
2008-04-01 18:23 ` Anthony Liguori
2008-04-01 18:21 ` Anthony Liguori
2008-04-01 19:22 ` Avi Kivity
2008-04-01 22:38 ` Andrea Arcangeli
2008-04-01 22:22 ` Andrea Arcangeli
2008-04-01 22:29 ` Anthony Liguori
2008-04-02 4:00 ` Avi Kivity
2008-04-01 19:28 ` Ben-Ami Yassour1
2008-04-01 19:43 ` Avi Kivity
2008-04-01 20:04 ` Anthony Liguori
2008-04-02 4:32 ` Avi Kivity
2008-04-02 7:03 ` Andrea Arcangeli
2008-04-02 9:50 ` Avi Kivity
2008-04-02 10:28 ` Andrea Arcangeli
2008-04-02 10:59 ` Avi Kivity
2008-04-02 11:16 ` Avi Kivity
2008-04-02 11:50 ` Andrea Arcangeli
2008-04-02 11:53 ` Andrea Arcangeli
2008-04-03 8:51 ` Avi Kivity
2008-04-02 14:59 ` Anthony Liguori
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