[Xen-changelog] [xen master] amd-iommu: disable iommu_hap_pt_share with AMD IOMMUs

[patchbot@xxxxxxx]

commit c2ba3db31ef2d9f1e40e7b6c16cf3be3d671d555
Author:     Roger Pau Monné <roger.pau@xxxxxxxxxx>
AuthorDate: Mon Aug 11 14:57:09 2014 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Mon Aug 11 14:57:09 2014 +0200

    amd-iommu: disable iommu_hap_pt_share with AMD IOMMUs

    According to the comment in p2m.h, AMD IOMMUs don't work correctly
    with page types different than p2m_ram_rw when the p2m is shared
    between HAP and IOMMU, so disable this sharing when using AMD IOMMUs.

    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Acked-by Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
 xen/drivers/passthrough/amd/iommu_init.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/xen/drivers/passthrough/amd/iommu_init.c 
b/xen/drivers/passthrough/amd/iommu_init.c
index b2f74ef..56bda00 100644
--- a/xen/drivers/passthrough/amd/iommu_init.c
+++ b/xen/drivers/passthrough/amd/iommu_init.c
@@ -1255,6 +1255,14 @@ int __init amd_iommu_init(void)
     if ( iterate_ivrs_mappings(amd_iommu_setup_device_table) != 0 )
         goto error_out;

+    /*
+     * Disable sharing HAP page tables with AMD IOMMU,
+     * since it only supports p2m_ram_rw, and this would
+     * prevent doing IO to/from mapped grant frames.
+     */
+    iommu_hap_pt_share = 0;
+    printk(XENLOG_DEBUG "AMD-Vi: Disabled HAP memory map sharing with 
IOMMU\n");
+
     /* per iommu initialization  */
     for_each_amd_iommu ( iommu )
         if ( amd_iommu_init_one(iommu) != 0 )
--
generated by git-patchbot for /home/xen/git/xen.git#master

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