From: Anthony Liguori <aliguori@us.ibm.com>
To: Avi Kivity <avi@qumranet.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>,
Mark McLoughlin <markmc@redhat.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH 1/5] vring: Replace mmap() interface with ioctl()
Date: Sat, 14 Jun 2008 18:23:18 -0500 [thread overview]
Message-ID: <485452E6.4070201@us.ibm.com> (raw)
In-Reply-To: <4853D3CB.4090709@qumranet.com>
Avi Kivity wrote:
> Rusty Russell wrote:
>> BTW, including base and limit makes sense. I didn't do this to start
>> since Avi doesn't want to guarentee kvm's guest mapping linear (of
>> course he's only doing this so he can fix it later).
>>
>
> And also, because memory hotplug and 64-bit PCI BARs require reserving
> an infinite virtual address space range. Not to mention that someone
> needs to update the dirty bitmap in case we're live migrating.
You can certainly hotplug to the next RAM address so it doesn't require
infinite space. You wouldn't send a packet from/to a PCI IO region so I
don't think that practically speaking that's a problem.
But the base/limit thing is a bit of a hack. I don't think the
userspace translation is going to be a problem.
Regards,
Anthony Liguori
next prev parent reply other threads:[~2008-06-14 23:23 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-06-13 13:57 [PATCH 0/0][RFC] KVM use of vringfd Mark McLoughlin
2008-06-13 13:57 ` [PATCH 1/5] vring: Replace mmap() interface with ioctl() Mark McLoughlin
2008-06-13 13:57 ` [PATCH 2/5] lguest: Use VRINGSETINFO ioctl() instead of mmap() Mark McLoughlin
2008-06-13 13:57 ` [PATCH 3/5] kvm: qemu: Publish last_avail index in the ring Mark McLoughlin
2008-06-13 13:58 ` [PATCH 4/5] kvm: qemu: Use vringfd to eliminate copies Mark McLoughlin
2008-06-13 13:58 ` [PATCH 5/5] kvm: qemu: Add support for partial csums and GSO Mark McLoughlin
2008-06-14 23:28 ` [PATCH 4/5] kvm: qemu: Use vringfd to eliminate copies Anthony Liguori
2008-06-16 2:10 ` Rusty Russell
2008-06-16 14:02 ` Anthony Liguori
2008-06-16 14:58 ` Avi Kivity
2008-06-18 5:43 ` Rusty Russell
2008-06-18 14:01 ` Avi Kivity
2008-06-17 14:08 ` Mark McLoughlin
2008-06-17 14:54 ` Anthony Liguori
2008-06-17 15:45 ` Mark McLoughlin
2008-06-13 14:09 ` [PATCH 1/5] vring: Replace mmap() interface with ioctl() Avi Kivity
2008-06-17 12:19 ` Mark McLoughlin
2008-06-18 14:05 ` Avi Kivity
2008-06-14 9:02 ` Rusty Russell
2008-06-14 14:20 ` Avi Kivity
2008-06-14 23:23 ` Anthony Liguori [this message]
2008-06-15 15:24 ` Avi Kivity
2008-06-15 19:13 ` Anthony Liguori
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