From: Avi Kivity <avi@qumranet.com>
To: Anthony Liguori <aliguori@us.ibm.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: Sun, 15 Jun 2008 08:24:46 -0700 [thread overview]
Message-ID: <4855343E.4020808@qumranet.com> (raw)
In-Reply-To: <485452E6.4070201@us.ibm.com>
Anthony Liguori wrote:
>>
>> 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.
But you need to reserve that space to prevent mallocs from going there.
How much space do you reserve?
> You wouldn't send a packet from/to a PCI IO region so I don't think
> that practically speaking that's a problem.
If we implement interguest shared memory as a pci device, then it
becomes a problem.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
next prev parent reply other threads:[~2008-06-15 15:24 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
2008-06-15 15:24 ` Avi Kivity [this message]
2008-06-15 19:13 ` Anthony Liguori
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