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RE: [Xen-devel] GNTTAB_copy

To: Steven Smith <steven.smith@xxxxxxxxxx>
Subject: RE: [Xen-devel] GNTTAB_copy
From: "Kumar, Venkat" <Venkat.Kumar@xxxxxxx>
Date: Thu, 5 Feb 2009 16:17:07 +0530
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Thread-topic: [Xen-devel] GNTTAB_copy

Please find the patches attached with this email.

The changes you are interested are in grant_table.patch

 

Venkat

 

-----Original Message-----
From: Steven Smith [mailto:steven.smith@xxxxxxxxxx]
Sent: Thursday, February 05, 2009 4:13 PM
To: Kumar, Venkat
Cc: Steven Smith; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] GNTTAB_copy

 

> Atlast it worked out. I had to make some changes in Xen (it wasn't

> allowing a copy across domains) to make it work apart from the patch

> you sent.

That's odd.  Would you mind sending me your patch, please, so that I

can see what's wrong with the existing implementation?

 

Steven.

 

 

> -----Original Message-----

> From: Steven Smith [mailto:steven.smith@xxxxxxxxxx]

> Sent: Friday, January 30, 2009 10:04 PM

> To: Kumar, Venkat

> Cc: Steven Smith; xen-devel@xxxxxxxxxxxxxxxxxxx

> Subject: Re: [Xen-devel] GNTTAB_copy

>

> > Steve,

> >

> > I have ported the GNTTAB_copy part from netchannel2 xen-unstable to xen-unstable. But the hypercall is failing with a status -1.

> >

> > xm dmesg says

> > ===========================================

> > Bad flags (0) or dom (0). (expected dom 9)

> > ===========================================

> Okay, so Xen started processing the grant table operation, but found

> that the grant entry in the granting domain's grant table was bad

> (because it was full of zeroes).  That probably indicates that it was

> accessing completely the wrong gref.

>

> > I am granting the page with a flag ( GTF_reading | GTF_writing & GTF_permit_access ) but still it did not work.

> >

> > What could be wrong here?

> I'm not sure.  I'd suggest you put some printks in your guests (both

> the granting one and the HVM one) to make sure that they agree on the

> grant reference number, and some in Xen to make sure that it's reading

> the hypercall arguments correctly.

>

> Steven.

>

>

> > -----Original Message-----

> > From: Steven Smith [mailto:steven.smith@xxxxxxxxxx]

> > Sent: Friday, January 30, 2009 4:52 PM

> > To: Kumar, Venkat

> > Cc: Steven Smith; xen-devel@xxxxxxxxxxxxxxxxxxx

> > Subject: Re: [Xen-devel] GNTTAB_copy

> >

> > That's unfortunate; the repository works fine for me.

> >

> > There aren't any other ways of downloading the entire repository, but

> > the changes you need to make are pretty self-contained, so I've

> > attached the relevant cset.  You'll need to get rid of the

> > GNTTABOP_set_version bits, but apart from that it should all be fairly

> > obvious.

> >

> > Steven.

> >

> >

> > > Steven - Thanks for the pointer.

> > > I get an error while downloading the code.

> > >

> > > =======================================================================

> > > hg clone http://xenbits.xensource.com/ext/netchannel2/xen-unstable.hg

> > > destination directory: xen-unstable.hg

> > > requesting all changes

> > > adding changesets

> > > transaction abort!

> > > rollback completed

> > > abort: Connection reset by peer

> > > =======================================================================

> > >

> > > Do you know any alternate download?

> > >

> > > Venkat

> > >

> > > -----Original Message-----

> > > From: Steven Smith [mailto:steven.smith@xxxxxxxxxx]

> > > Sent: Friday, January 30, 2009 4:18 PM

> > > To: Kumar, Venkat

> > > Cc: xen-devel@xxxxxxxxxxxxxxxxxxx

> > > Subject: Re: [Xen-devel] GNTTAB_copy

> > >

> > > > Is GNTTAB_copy command in the Hypercall "HYPERVISOR_grant_table_op"

> > > > supported between two HVM's?

> > > It's not in xen-unstable, no, but it is if you use the netchannel2

> > > hypervisor (available from

> > > http://xenbits.xensource.com/ext/netchannel2/xen-unstable.hg).  It'd

> > > be pretty easy to cross-port, if you wanted to have a go at that.  The

> > > interesting cset is this one:

> > >

> > > changeset:   19112:ea4b9c439ac3

> > > user:        Steven Smith <steven.smith@xxxxxxxxxxxxx>

> > > date:        Thu Jan 22 09:53:12 2009 +0000

> > > files:       xen/arch/x86/hvm/hvm.c xen/include/xen/hypercall.h

> > > description:

> > > Allow GNTABOP_copy to be used from HVM domains.

> > >

> > > Steven.

Attachment: hypercall.patch
Description: hypercall.patch

Attachment: grant_table.patch
Description: grant_table.patch

Attachment: hvm.patch
Description: hvm.patch

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