iommu: disable by default. 'iommu' on cmdline to enable.

Signed-off-by: Keir Fraser <keir.fraser@citrix.com>

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index 5d41ddfb8782d276e53efb460071672f916455b2..2e2afaeb1302e3f71a82bd8b2fffe53a7d69b7fb 100644 (file)
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -24,7 +24,7 @@ static int iommu_populate_page_table(struct domain *d);
 int intel_vtd_setup(void);
 int amd_iov_detect(void);
 
-int iommu_enabled = 1;
+int iommu_enabled = 0;
 boolean_param("iommu", iommu_enabled);
 
 int iommu_pv_enabled = 0;