From: Joerg Roedel <jroedel@suse.de>
Date: Fri, 12 Jun 2015 10:44:33 +0000 (+0200)
Subject: iommu/vt-d: Don't disable translation prior to OS handover
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=60b523ecfede05796aa77024b3960fecabab4de7;p=linux-beck.git

iommu/vt-d: Don't disable translation prior to OS handover

For all the copy-translation code to run, we have to keep
translation enabled in intel_iommu_init(). So remove the
code disabling it.

Tested-by: ZhenHua Li <zhen-hual@hp.com>
Tested-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index ca7d37c3981f..e40c858a84fe 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4484,13 +4484,6 @@ int __init intel_iommu_init(void)
 		goto out_free_dmar;
 	}
 
-	/*
-	 * Disable translation if already enabled prior to OS handover.
-	 */
-	for_each_active_iommu(iommu, drhd)
-		if (iommu->gcmd & DMA_GCMD_TE)
-			iommu_disable_translation(iommu);
-
 	if (dmar_dev_scope_init() < 0) {
 		if (force_on)
 			panic("tboot: Failed to initialize DMAR device scope\n");