[Xen-devel] using GNTTABOP_transfer on hvm guests

[Olaf Hering <olaf@xxxxxxxxx>]

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


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