The VIRTIO_BALLOON_F_PAGE_POISON feature bit is used to indicate if the
guest is using page poisoning. Guest writes to the poison_val config
field to tell host about the page poisoning value that is in use.
Suggested-by: Michael S. Tsirkin
Signed-off-by: Wei Wang
Cc: Michael S. Tsirkin
Cc: Mich
In some usages, e.g. virtio-balloon, a kernel module needs to know if
page poisoning is in use. This patch exposes the page_poisoning_enabled
function to kernel modules.
Signed-off-by: Wei Wang
Cc: Andrew Morton
Cc: Michal Hocko
Cc: Michael S. Tsirkin
Acked-by: Andrew Morton
---
mm/page_pois
Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the
support of reporting hints of guest free pages to host via virtio-balloon.
Host requests the guest to report free page hints by sending a command
to the guest via setting the VIRTIO_BALLOON_HOST_CMD_FREE_PAGE_HINT bit
of the
This patch adds a function to get free pages blocks from a free page
list. The obtained free page blocks are hints about free pages, because
there is no guarantee that they are still on the free page list after
the function returns.
One use example of this patch is to accelerate live migration by
This patch series is separated from the previous "Virtio-balloon
Enhancement" series. The new feature, VIRTIO_BALLOON_F_FREE_PAGE_HINT,
implemented by this series enables the virtio-balloon driver to report
hints of guest free pages to the host. It can be used to accelerate live
migration of VMs.
On 06/14/2018 11:01 PM, Nitesh Narayan Lal wrote:
Hi Wei,
On 06/12/2018 07:05 AM, Wei Wang wrote:
On 06/12/2018 09:59 AM, Linus Torvalds wrote:
On Mon, Jun 11, 2018 at 6:36 PM Michael S. Tsirkin
wrote:
Maybe it will help to have GFP_NONE which will make any allocation
fail if attempted. Lin
On Thu, Jun 14, 2018 at 10:06:58PM -0400, Martin K. Petersen wrote:
>
> Matthew,
>
> > Removing the percpu_ida code nets over 400 lines of removal. It's not
> > as spectacular as deleting an entire architecture, but it's still a
> > worthy reduction in lines of code.
>
> Since most of the chang
On Thu, Jun 14, 2018 at 12:02:31PM +0200, Cornelia Huck wrote:
> So, do you know from the outset that there will be such a coupled
> device? I.e., is it a property of the VM definition?
>
> Can there be a 'prepared' virtio-net device that presents the STANDBY
> feature even if there currently is n
Matthew,
> Removing the percpu_ida code nets over 400 lines of removal. It's not
> as spectacular as deleting an entire architecture, but it's still a
> worthy reduction in lines of code.
Since most of the changes are in scsi or target, should I take this
series through my tree?
--
Martin K.
Thank you for sharing your thoughts, Cornelia. With questions below, I
think you raised really good points, some of which I don't have answer
yet and would also like to explore here.
First off, I don't want to push the discussion to the extreme at this
point, or sell anything about having QEMU man
On 06/14/18 13:59, Nick Desaulniers wrote:
> On Thu, Jun 14, 2018 at 1:48 PM H. Peter Anvin wrote:
>>
>> On 06/13/18 14:05, Nick Desaulniers wrote:
>>> From: "H. Peter Anvin"
>>>
>>> i386 and x86-64 uses different registers for arguments; make them
>>> available so we don't have to #ifdef in the
On 06/13/18 14:05, Nick Desaulniers wrote:
> From: "H. Peter Anvin"
>
> i386 and x86-64 uses different registers for arguments; make them
> available so we don't have to #ifdef in the actual code.
>
> Native size and specified size (q, l, w, b) versions are provided.
>
> Suggested-by: Sedat Dil
On Wed, Jun 13, 2018 at 06:02:01PM -0700, Siwei Liu wrote:
> >> And it's the guest that needs failover support not the VM.
> >
> >
> > Isn't guest and VM synonymous?
Guest is whatever software is running on top of the hypervisor.
The virtual machine is the interface between the two.
--
MST
I've been pointed to this discussion (which I had missed previously)
and I'm getting a headache. Let me first summarize how I understand how
this feature is supposed to work, then I'll respond to some individual
points.
The basic idea is to enable guests to migrate seamlessly, while still
making i
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