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* [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
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2019-12-12 18:55 [Virtio-fs] virtio-fs on zLinux (s390x) Gong Su
@ 2019-12-12 18:59 ` Dr. David Alan Gilbert
  2019-12-12 19:10   ` Gong Su
  2019-12-13 10:44   ` Cornelia Huck
  2019-12-13 11:02 ` Stefan Hajnoczi
  1 sibling, 2 replies; 12+ messages in thread
From: Dr. David Alan Gilbert @ 2019-12-12 18:59 UTC (permalink / raw)
  To: Gong Su; +Cc: virtio-fs, Cornelia Huck

* 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://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.

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://www.redhat.com/mailman/listinfo/virtio-fs

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


^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  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 10:44   ` Cornelia Huck
  1 sibling, 1 reply; 12+ messages in thread
From: Gong Su @ 2019-12-12 19:10 UTC (permalink / raw)
  To: Dr. David Alan Gilbert; +Cc: virtio-fs, imammedo, Cornelia Huck


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Thanks Dave. That was quick!

Igor, any idea when this will happen? :-)



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
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2019-12-12 18:59 ` Dr. David Alan Gilbert
  2019-12-12 19:10   ` Gong Su
@ 2019-12-13 10:44   ` Cornelia Huck
  1 sibling, 0 replies; 12+ messages in thread
From: Cornelia Huck @ 2019-12-13 10:44 UTC (permalink / raw)
  To: Dr. David Alan Gilbert, Gong Su; +Cc: virtio-fs

On Thu, 12 Dec 2019 18:59:00 +0000
"Dr. David Alan Gilbert" <dgilbert@redhat.com> wrote:

> * 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://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.  
> 
> 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.

Yes, that was my understanding as well.

Obviously, nobody has actually tested virtio-fs on s390x so far :)
Wiring it up for virtio-ccw looks straightforward, though, and I did
not spot any obvious problems when looking at the code a while back.

One thing that needs more thought is DAX support in the future (i.e.
where to put the shared regions for ccw etc.) There had been some
discussion on that topic in the past, but I currently don't have any
spare cycles for continuing there. That said, more s390x folks looking
at this would certainly be a good idea :)


^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2019-12-12 18:55 [Virtio-fs] virtio-fs on zLinux (s390x) Gong Su
  2019-12-12 18:59 ` Dr. David Alan Gilbert
@ 2019-12-13 11:02 ` Stefan Hajnoczi
  2019-12-13 15:44   ` Gong Su
  1 sibling, 1 reply; 12+ messages in thread
From: Stefan Hajnoczi @ 2019-12-13 11:02 UTC (permalink / raw)
  To: Gong Su; +Cc: virtio-fs, Cornelia Huck

[-- Attachment #1: Type: text/plain, Size: 577 bytes --]

On Thu, Dec 12, 2019 at 01:55:25PM -0500, Gong Su wrote:
> 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.

Does s390 support vhost-user?

virtio-fs is implemented as a vhost-user device so this is a
requirement.  Shared memory is a vhost-user requirement and that's where
the -numa command-line option dependency comes from.

Stefan

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^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2019-12-12 19:10   ` Gong Su
@ 2019-12-13 13:17     ` Igor Mammedov
  2019-12-13 15:45       ` Gong Su
  0 siblings, 1 reply; 12+ messages in thread
From: Igor Mammedov @ 2019-12-13 13:17 UTC (permalink / raw)
  To: Gong Su; +Cc: virtio-fs, Cornelia Huck

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
> 
> 
> 
> 


^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2019-12-13 11:02 ` Stefan Hajnoczi
@ 2019-12-13 15:44   ` Gong Su
  0 siblings, 0 replies; 12+ messages in thread
From: Gong Su @ 2019-12-13 15:44 UTC (permalink / raw)
  To: Stefan Hajnoczi; +Cc: virtio-fs, Cornelia Huck


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Hi Stefan, I believe s390 does support vhost-user. I can bring up a guest
with virtio-fs specific options:

-chardev socket,id=char0,path=/tmp/vhostqemu  \
-device vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs \
-object memory-backend-file,id=mem,size=8G,mem-path=/dev/shm,share=on

but leave out the -numa option. I can see virtiofsd is getting messages
(with -o debug option) when the guest boots up. But of course if I try to
mount inside the guest nothing happens.



From:	Stefan Hajnoczi <stefanha@redhat.com>
To:	Gong Su <gongsu@us.ibm.com>
Cc:	virtio-fs@redhat.com, Cornelia Huck <cohuck@redhat.com>
Date:	12/13/2019 06:02 AM
Subject:	[EXTERNAL] Re: [Virtio-fs] virtio-fs on zLinux (s390x)



On Thu, Dec 12, 2019 at 01:55:25PM -0500, Gong Su wrote:
> 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.

Does s390 support vhost-user?

virtio-fs is implemented as a vhost-user device so this is a
requirement.  Shared memory is a vhost-user requirement and that's where
the -numa command-line option dependency comes from.

Stefan
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^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2019-12-13 13:17     ` Igor Mammedov
@ 2019-12-13 15:45       ` Gong Su
  0 siblings, 0 replies; 12+ messages in thread
From: Gong Su @ 2019-12-13 15:45 UTC (permalink / raw)
  To: Igor Mammedov; +Cc: virtio-fs, Cornelia Huck


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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
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2020-03-17  9:41 ` Igor Mammedov
  2020-03-17 12:11   ` Dr. David Alan Gilbert
@ 2020-03-18  2:59   ` Gong Su
  1 sibling, 0 replies; 12+ messages in thread
From: Gong Su @ 2020-03-18  2:59 UTC (permalink / raw)
  To: Igor Mammedov; +Cc: virtio-fs, Cornelia Huck


[-- Attachment #1.1: Type: text/plain, Size: 4649 bytes --]


Great! I'll give it a shot and see what happens. Thanks.



From:	Igor Mammedov <imammedo@redhat.com>
To:	"Gong Su" <gongsu@us.ibm.com>
Cc:	Cornelia Huck <cohuck@redhat.com>, "Dr. David Alan Gilbert"
            <dgilbert@redhat.com>, virtio-fs@redhat.com
Date:	03/17/2020 05:50 AM
Subject:	[EXTERNAL] Re: [Virtio-fs] virtio-fs on zLinux (s390x)



On Tue, 17 Mar 2020 02:05:06 -0500
"Gong Su" <gongsu@us.ibm.com> wrote:

>
>
> 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.

it's already upstream.

there is a new upstream option -machine memory-backend=...
that allows to set custom backend for main RAM

> __________________
>
> 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
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2020-03-17  9:41 ` Igor Mammedov
@ 2020-03-17 12:11   ` Dr. David Alan Gilbert
  2020-03-18  2:59   ` Gong Su
  1 sibling, 0 replies; 12+ messages in thread
From: Dr. David Alan Gilbert @ 2020-03-17 12:11 UTC (permalink / raw)
  To: Igor Mammedov; +Cc: virtio-fs, Cornelia Huck

* Igor Mammedov (imammedo@redhat.com) wrote:
> On Tue, 17 Mar 2020 02:05:06 -0500
> "Gong Su" <gongsu@us.ibm.com> wrote:
> 
> > 
> > 
> > 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.
> 
> it's already upstream.
> 
> there is a new upstream option -machine memory-backend=...
> that allows to set custom backend for main RAM

SOmething like:
   -object memory-backend-memfd,size=2G,id=mem,share=on
   -machine pc,memory-backend=mem

seems to be the syntax then.

Good, that does make life simpler.

Dave

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


^ permalink raw reply	[flat|nested] 12+ messages in thread
* Re: [Virtio-fs] virtio-fs on zLinux (s390x)
  2020-03-17  7:05 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
  0 siblings, 2 replies; 12+ messages in thread
From: Igor Mammedov @ 2020-03-17  9:41 UTC (permalink / raw)
  To: Gong Su; +Cc: virtio-fs, Cornelia Huck

On Tue, 17 Mar 2020 02:05:06 -0500
"Gong Su" <gongsu@us.ibm.com> wrote:

> 
> 
> 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.

it's already upstream.

there is a new upstream option -machine memory-backend=...
that allows to set custom backend for main RAM

> __________________
> 
> 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
> >
> >
> >
> >
> 
> 
> 


^ permalink raw reply	[flat|nested] 12+ messages in thread
* 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


[-- Attachment #1.1: Type: text/plain, Size: 3811 bytes --]



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
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 --
2019-12-12 18:55 [Virtio-fs] virtio-fs on zLinux (s390x) 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
2020-03-17  7:05 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

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