From: Paolo Bonzini <pbonzini@redhat.com>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: fes@google.com, aarcange@redhat.com, riel@redhat.com,
kvm@vger.kernel.org, "Michael S. Tsirkin" <mst@redhat.com>,
yvugenfi@redhat.com, linux-kernel@vger.kernel.org,
mikew@google.com, yinghan@google.com,
virtualization@lists.linux-foundation.org
Subject: Re: [PATCH] virtio-balloon spec: provide a version of the "silent deflate" feature that works
Date: Mon, 10 Sep 2012 07:51:42 +0200 [thread overview]
Message-ID: <504D7FEE.20008@redhat.com> (raw)
In-Reply-To: <87fw6qfya7.fsf@rustcorp.com.au>
Il 10/09/2012 03:43, Rusty Russell ha scritto:
>> Now that vfio is upstream and work on qemu integration
>> is being worked on, we might finally see people using this bit
>> to allow memory overcommit with device assignment.
> That was left-field.... so you're saying some guest might pull a page
> from the balloon and DMA to it, and the vfio device needs to know in
> advance that it's going to do it?
Not the vfio device, but the page needs to be pinned with mlock so the
effect is the same.
> But what will we do if the guest doesn't ack the bit?
Just pin the whole memory.
Paolo
> ie. I don't think it can really be optional.
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
fes@google.com, aarcange@redhat.com, riel@redhat.com,
kvm@vger.kernel.org, yvugenfi@redhat.com,
linux-kernel@vger.kernel.org, mikew@google.com,
yinghan@google.com, virtualization@lists.linux-foundation.org
Subject: Re: [PATCH] virtio-balloon spec: provide a version of the "silent deflate" feature that works
Date: Mon, 10 Sep 2012 07:51:42 +0200 [thread overview]
Message-ID: <504D7FEE.20008@redhat.com> (raw)
In-Reply-To: <87fw6qfya7.fsf@rustcorp.com.au>
Il 10/09/2012 03:43, Rusty Russell ha scritto:
>> Now that vfio is upstream and work on qemu integration
>> is being worked on, we might finally see people using this bit
>> to allow memory overcommit with device assignment.
> That was left-field.... so you're saying some guest might pull a page
> from the balloon and DMA to it, and the vfio device needs to know in
> advance that it's going to do it?
Not the vfio device, but the page needs to be pinned with mlock so the
effect is the same.
> But what will we do if the guest doesn't ack the bit?
Just pin the whole memory.
Paolo
> ie. I don't think it can really be optional.
next prev parent reply other threads:[~2012-09-10 5:51 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-06 7:46 [PATCH] virtio-balloon spec: provide a version of the "silent deflate" feature that works Paolo Bonzini
2012-09-06 7:46 ` Paolo Bonzini
2012-09-06 8:47 ` Michael S. Tsirkin
2012-09-06 8:47 ` Michael S. Tsirkin
2012-09-06 9:24 ` Paolo Bonzini
2012-09-06 9:24 ` Paolo Bonzini
2012-09-06 9:44 ` Michael S. Tsirkin
2012-09-06 9:44 ` Michael S. Tsirkin
2012-09-06 9:57 ` Paolo Bonzini
2012-09-06 9:57 ` Paolo Bonzini
2012-09-06 10:53 ` Michael S. Tsirkin
2012-09-06 10:53 ` Michael S. Tsirkin
2012-09-06 12:13 ` Paolo Bonzini
2012-09-06 12:13 ` Paolo Bonzini
2012-09-06 12:51 ` Michael S. Tsirkin
2012-09-06 12:51 ` Michael S. Tsirkin
2012-09-06 13:12 ` Paolo Bonzini
2012-09-06 13:12 ` Paolo Bonzini
2012-09-06 23:45 ` Rusty Russell
2012-09-07 5:42 ` Michael S. Tsirkin
2012-09-07 5:42 ` Michael S. Tsirkin
2012-09-07 6:39 ` Rusty Russell
2012-09-07 6:39 ` Rusty Russell
2012-09-07 9:27 ` Paolo Bonzini
2012-09-07 9:27 ` Paolo Bonzini
2012-09-07 10:53 ` Michael S. Tsirkin
2012-09-07 10:53 ` Michael S. Tsirkin
2012-09-07 11:20 ` Paolo Bonzini
2012-09-07 11:20 ` Paolo Bonzini
2012-09-07 12:17 ` Michael S. Tsirkin
2012-09-07 12:17 ` Michael S. Tsirkin
2012-09-07 12:22 ` Paolo Bonzini
2012-09-07 12:22 ` Paolo Bonzini
2012-09-07 12:44 ` Michael S. Tsirkin
2012-09-07 12:44 ` Michael S. Tsirkin
2012-09-07 14:04 ` Paolo Bonzini
2012-09-07 14:04 ` Paolo Bonzini
2012-09-07 14:25 ` Michael S. Tsirkin
2012-09-07 14:25 ` Michael S. Tsirkin
2012-09-07 14:44 ` Paolo Bonzini
2012-09-07 14:44 ` Paolo Bonzini
2012-09-08 22:22 ` Michael S. Tsirkin
2012-09-08 22:22 ` Michael S. Tsirkin
2012-09-10 5:50 ` Paolo Bonzini
2012-09-10 6:03 ` Michael S. Tsirkin
2012-09-10 6:03 ` Michael S. Tsirkin
2012-09-10 6:38 ` Paolo Bonzini
2012-09-10 6:38 ` Paolo Bonzini
2012-09-10 6:47 ` Michael S. Tsirkin
2012-09-10 6:47 ` Michael S. Tsirkin
2012-09-10 6:55 ` Paolo Bonzini
2012-09-10 6:55 ` Paolo Bonzini
2012-09-10 5:50 ` Paolo Bonzini
2012-09-07 10:43 ` Michael S. Tsirkin
2012-09-07 10:43 ` Michael S. Tsirkin
2012-09-08 5:06 ` Rusty Russell
2012-09-08 5:06 ` Rusty Russell
2012-09-08 10:32 ` Paolo Bonzini
2012-09-08 10:32 ` Paolo Bonzini
2012-09-08 22:37 ` Michael S. Tsirkin
2012-09-08 22:37 ` Michael S. Tsirkin
2012-09-10 1:43 ` Rusty Russell
2012-09-10 1:43 ` Rusty Russell
2012-09-10 5:51 ` Paolo Bonzini [this message]
2012-09-10 5:51 ` Paolo Bonzini
2012-09-10 5:51 ` Michael S. Tsirkin
2012-09-10 5:51 ` Michael S. Tsirkin
2012-09-12 6:24 ` Rusty Russell
2012-09-12 6:24 ` Rusty Russell
2012-09-06 23:41 ` Michael S. Tsirkin
2012-09-06 23:41 ` Michael S. Tsirkin
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