* using GNTTABOP_transfer on hvm guests
@ 2010-09-24 20:33 Olaf Hering
2010-09-25 6:46 ` Keir Fraser
0 siblings, 1 reply; 2+ messages in thread
From: Olaf Hering @ 2010-09-24 20:33 UTC (permalink / raw)
To: xen-devel
While looking for more missing p2m_is_paging(p2mt) checks I noticed that
also the GNTTABOP_transfer code path may return GNTST_eagain if all code
paths get changed to verify the p2mt.
But can this really happen? Reading the comments for
MODPARM_rx_copy/MODPARM_rx_flip in drivers/xen/netfront/netfront.c
indicates that hvm guests will not use the GNTTABOP_transfer path.
Are there any possible users for GNTTABOP_transfer in a hvm guest?
Could xenpaging ever work for paravirtualized guests?
Olaf
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: using GNTTABOP_transfer on hvm guests
2010-09-24 20:33 using GNTTABOP_transfer on hvm guests Olaf Hering
@ 2010-09-25 6:46 ` Keir Fraser
0 siblings, 0 replies; 2+ messages in thread
From: Keir Fraser @ 2010-09-25 6:46 UTC (permalink / raw)
To: Olaf Hering, xen-devel
On 24/09/2010 21:33, "Olaf Hering" <olaf@aepfle.de> wrote:
>
> While looking for more missing p2m_is_paging(p2mt) checks I noticed that
> also the GNTTABOP_transfer code path may return GNTST_eagain if all code
> paths get changed to verify the p2mt.
> But can this really happen? Reading the comments for
> MODPARM_rx_copy/MODPARM_rx_flip in drivers/xen/netfront/netfront.c
> indicates that hvm guests will not use the GNTTABOP_transfer path.
>
> Are there any possible users for GNTTABOP_transfer in a hvm guest?
> Could xenpaging ever work for paravirtualized guests?
GNTTABOP_transfer used to be used in our pv network drivers, but was
superceded years ago. It's really never used these days.
-- Keir
> Olaf
>
>
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
^ permalink raw reply [flat|nested] 2+ messages in thread
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2010-09-24 20:33 using GNTTABOP_transfer on hvm guests Olaf Hering
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