[Xen-changelog] [xen master] iommu: don't need to map dom0 page when the PT is shared

[patchbot@xxxxxxx]

commit 9b51591c330672765d866a5ed4ed8e40c75bb1cf
Author:     Julien Grall <julien.grall@xxxxxxxxxx>
AuthorDate: Mon Feb 24 12:33:00 2014 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Feb 24 12:33:00 2014 +0100

    iommu: don't need to map dom0 page when the PT is shared
    
    Currently iommu_init_dom0 is browsing the page list and call map_page 
callback
    on each page.
    
    On both AMD and VTD drivers, the function will directly return if the page
    table is shared with the processor. So Xen can safely avoid to run through
    the page list.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/drivers/passthrough/iommu.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 19b0e23..c70165a 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -153,7 +153,7 @@ void __init iommu_dom0_init(struct domain *d)
 
     register_keyhandler('o', &iommu_p2m_table);
     d->need_iommu = !!iommu_dom0_strict;
-    if ( need_iommu(d) )
+    if ( need_iommu(d) && !iommu_use_hap_pt(d) )
     {
         struct page_info *page;
         unsigned int i = 0;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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