On Tue, Jul 25, 2017 at 08:26:51PM +0300, Oleksandr Tyshchenko wrote: > From: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com> > > This flag is intended to let Xen know that the guest has devices > which will most likely be used for passthrough and as the result > the IOMMU is expected to be used for this domain. > > The primary aim of this knowledge is to help the IOMMUs that don't > share page tables with the CPU on ARM be ready before P2M code starts > updating IOMMU mapping. > So, if this flag is set the non-shared IOMMUs will populate > their page tables at the domain creation time and thereby will be able > to handle IOMMU mapping updates from *the very beginning*. > > In order to retain the current behavior for x86 still call > iommu_domain_init() with use_iommu flag being forced to false. > > Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com> > CC: Jan Beulich <jbeul...@suse.com> > CC: Julien Grall <julien.gr...@arm.com> > CC: Ian Jackson <ian.jack...@eu.citrix.com> > CC: Wei Liu <wei.l...@citrix.com> > > --- > Changes in V1: > - Treat use_iommu flag as the ARM decision only. Don't use > common domain creation flag for it, use ARM config instead. > - Clarify patch subject/description. > > Changes in V2: > - Cosmetic fixes. > --- > tools/libxl/libxl_arm.c | 8 ++++++++
Acked-by: Wei Liu <wei.l...@citrix.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org https://lists.xen.org/xen-devel
