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* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
@ 2020-03-17  7:05 Gong Su
  2020-03-17  9:41 ` Igor Mammedov
  0 siblings, 1 reply; 12+ messages in thread
From: Gong Su @ 2020-03-17  7:05 UTC (permalink / raw)
  To: Igor Mammedov; +Cc: virtio-fs, Cornelia Huck


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Hi Igor, just wondering if there is any updates on getting the patches that
will allow shared memory without -numa (not supported on s390 yet)? Thanks.

__________________

Hi Igor, that would be great. Thanks.



From:	Igor Mammedov <imammedo@redhat.com>
To:	"Gong Su" <gongsu@us.ibm.com>
Cc:	"Dr. David Alan Gilbert" <dgilbert@redhat.com>, Cornelia Huck
            <cohuck@redhat.com>, virtio-fs@redhat.com
Date:	12/13/2019 08:17 AM
Subject:	[EXTERNAL] Re: [Virtio-fs] virtio-fs on zLinux (s390x)



On Thu, 12 Dec 2019 14:10:32 -0500
"Gong Su" <gongsu@us.ibm.com> wrote:

>
> Thanks Dave. That was quick!
>
> Igor, any idea when this will happen? :-)
If you need early sneak peek, I can post common + s390 patches.


> From:		 "Dr. David Alan Gilbert" <dgilbert@redhat.com>
> To:		 Gong Su <gongsu@us.ibm.com>
> Cc:		 virtio-fs@redhat.com, Cornelia Huck <cohuck@redhat.com>
> Date:		 12/12/2019 01:59 PM
> Subject:		 [EXTERNAL] Re: [Virtio-fs] virtio-fs on zLinux (s390x)
>
>
>
> * Gong Su (gongsu@us.ibm.com) wrote:
> >
> >
> > Hi Stefan, I'm resending my questions to the list per your request.
> >
> > Basically, I'm trying to see if I can get virtio-fs to work on zLinux.
> > Following the instructions on
>
https://urldefense.proofpoint.com/v2/url?u=https-3A__virtio-2Dfs.gitlab.io_howto-2Dqemu.html&d=DwIFAg&c=jf_iaSHvJObTbx-siA1ZOg&r=tf-1fDxgEPUcSzS0GcREznaRLLY6eGivTqJEnr2bEmQ&m=bKfrjedGnP-cXu2BPH6ynhTbdi5nm0VW1nx6Qb5Q_7M&s=pkvbWd3P-tWRpKPww5iwoPHLE_HnkenEEJhywABpRuc&e=

>   I
> > was able to compile all the pieces but when I tried to run qemu I
> realized
> > that it needs -numa option which isn't supported on s390x yet.
> >
> > I have talked to Christian Borntraeger (whom I worked with on other
> > projects before) and he indicated that he had a plan to add -numa
support
> > for s390x but currently is busy on other things.
> >
> > So I'm trying to see if there are other ways for me to go forward
without
> > having to wait for Christian. I see two options:
> >
> > 1. Merge virtiofsd into qemu itself. In the "Interchangeability"
section
> of
> > the virtio-fs design page (
>
https://urldefense.proofpoint.com/v2/url?u=https-3A__virtio-2Dfs.gitlab.io_design.html&d=DwIFAg&c=jf_iaSHvJObTbx-siA1ZOg&r=tf-1fDxgEPUcSzS0GcREznaRLLY6eGivTqJEnr2bEmQ&m=bKfrjedGnP-cXu2BPH6ynhTbdi5nm0VW1nx6Qb5Q_7M&s=2VrG3dsgZcdW8uO6ZBiGtRgNp4X1z3d8TMXnUdHhfCc&e=

>  ), it
> > mentioned that "It is also possible to forego vhost-user and emulate
the
> > virtio-fs device directly inside the hypervisor, although this may
result
> > in poor isolation and security." Since each guest typically gets its
own
> > qemu process, maybe this is acceptable for some use cases. In exchange,
> you
> > get the benefit of not having to carve out a chunk of memory
> from /dev/shm
> > (and maybe simpler communication between virtiofsd and qemu).
> > 2. Use something other than -numa to share memory between virtiofsd and
> > qemu that's supported on zLinux. I'm not entirely familiar with qemu so
I
> > have no idea whether this is possible or not.
>
> Hi,
>   My understanding is that Igor Mammedov (imammedo@redhat.com) has plans
> to allow 'shared' to be set on main memory, so we wouldn't need the numa
> code.
>
> Dave
>
> > Thanks.
>
> > _______________________________________________
> > Virtio-fs mailing list
> > Virtio-fs@redhat.com
> >
>
https://urldefense.proofpoint.com/v2/url?u=https-3A__www.redhat.com_mailman_listinfo_virtio-2Dfs&d=DwIFAg&c=jf_iaSHvJObTbx-siA1ZOg&r=tf-1fDxgEPUcSzS0GcREznaRLLY6eGivTqJEnr2bEmQ&m=bKfrjedGnP-cXu2BPH6ynhTbdi5nm0VW1nx6Qb5Q_7M&s=O41fLQGJCOR0-Aj2Y4nziy3aTYTOCzaH8Lahe7xhBK8&e=

>
>
> --
> Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK
>
>
>
>




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^ permalink raw reply	[flat|nested] 12+ messages in thread
* [Virtio-fs] virtio-fs on zLinux (s390x)
@ 2019-12-12 18:55 Gong Su
  2019-12-12 18:59 ` Dr. David Alan Gilbert
  2019-12-13 11:02 ` Stefan Hajnoczi
  0 siblings, 2 replies; 12+ messages in thread
From: Gong Su @ 2019-12-12 18:55 UTC (permalink / raw)
  To: virtio-fs; +Cc: Cornelia Huck

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Hi Stefan, I'm resending my questions to the list per your request.

Basically, I'm trying to see if I can get virtio-fs to work on zLinux.
Following the instructions on https://virtio-fs.gitlab.io/howto-qemu.html I
was able to compile all the pieces but when I tried to run qemu I realized
that it needs -numa option which isn't supported on s390x yet.

I have talked to Christian Borntraeger (whom I worked with on other
projects before) and he indicated that he had a plan to add -numa support
for s390x but currently is busy on other things.

So I'm trying to see if there are other ways for me to go forward without
having to wait for Christian. I see two options:

1. Merge virtiofsd into qemu itself. In the "Interchangeability" section of
the virtio-fs design page (https://virtio-fs.gitlab.io/design.html), it
mentioned that "It is also possible to forego vhost-user and emulate the
virtio-fs device directly inside the hypervisor, although this may result
in poor isolation and security." Since each guest typically gets its own
qemu process, maybe this is acceptable for some use cases. In exchange, you
get the benefit of not having to carve out a chunk of memory from /dev/shm
(and maybe simpler communication between virtiofsd and qemu).
2. Use something other than -numa to share memory between virtiofsd and
qemu that's supported on zLinux. I'm not entirely familiar with qemu so I
have no idea whether this is possible or not.

Thanks.

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^ permalink raw reply	[flat|nested] 12+ messages in thread
end of thread, other threads:[~2020-03-18  2:59 UTC | newest]

Thread overview: 12+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2020-03-17  7:05 [Virtio-fs] virtio-fs on zLinux (s390x) Gong Su
2020-03-17  9:41 ` Igor Mammedov
2020-03-17 12:11   ` Dr. David Alan Gilbert
2020-03-18  2:59   ` Gong Su
  -- strict thread matches above, loose matches on Subject: below --
2019-12-12 18:55 Gong Su
2019-12-12 18:59 ` Dr. David Alan Gilbert
2019-12-12 19:10   ` Gong Su
2019-12-13 13:17     ` Igor Mammedov
2019-12-13 15:45       ` Gong Su
2019-12-13 10:44   ` Cornelia Huck
2019-12-13 11:02 ` Stefan Hajnoczi
2019-12-13 15:44   ` Gong Su

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