[PATCH 1 of 3] IOMMU: Add command line param to disable sharing of IOMMU and hap tables

[Andres Lagar-Cavilla <andres@lagarcavilla.org>]

 xen/drivers/passthrough/iommu.c |  2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)


The default is 1, and the command line parameter sets to 1. Disabling may be
desired if the host will contain VMs that do paging, sharing or mem access, and
won't be doing passthrough. These two features are mutually exclusive for AMD
processors.

Signed-off-by: Andres Lagar-Cavilla <andres@lagarcavilla.org>

diff -r d7e417afcbe4 -r 642c0e6a01c2 xen/drivers/passthrough/iommu.c
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -87,6 +87,8 @@ static void __init parse_iommu_param(cha
             iommu_dom0_strict = 1;
         else if ( !strcmp(s, "sharept") )
             iommu_hap_pt_share = 1;
+        else if ( !strcmp(s, "no-sharept") )
+            iommu_hap_pt_share = 0;
 
         s = ss + 1;
     } while ( ss );