From: Joerg Roedel <jroedel@suse.de>
Date: Wed, 23 Sep 2015 17:16:01 +0000 (+0200)
Subject: iommu/vt-d: Create RMRR mappings in newly allocated domains
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b1ce5b79aec8d8cd8bcd076d8cce8bc3cd690051;p=linux-beck.git

iommu/vt-d: Create RMRR mappings in newly allocated domains

Currently the RMRR entries are created only at boot time.
This means they will vanish when the domain allocated at
boot time is destroyed.
This patch makes sure that also newly allocated domains will
get RMRR mappings.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
---

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 24d31090b140..6ac6e741c46e 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3241,7 +3241,10 @@ static struct iova *intel_alloc_iova(struct device *dev,
 
 static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)
 {
+	struct dmar_rmrr_unit *rmrr;
 	struct dmar_domain *domain;
+	struct device *i_dev;
+	int i, ret;
 
 	domain = get_domain_for_dev(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);
 	if (!domain) {
@@ -3250,6 +3253,23 @@ static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)
 		return NULL;
 	}
 
+	/* We have a new domain - setup possible RMRRs for the device */
+	rcu_read_lock();
+	for_each_rmrr_units(rmrr) {
+		for_each_active_dev_scope(rmrr->devices, rmrr->devices_cnt,
+					  i, i_dev) {
+			if (i_dev != dev)
+				continue;
+
+			ret = domain_prepare_identity_map(dev, domain,
+							  rmrr->base_address,
+							  rmrr->end_address);
+			if (ret)
+				dev_err(dev, "Mapping reserved region failed\n");
+		}
+	}
+	rcu_read_unlock();
+
 	return domain;
 }