Commit 1c5ebba9 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

iommu/vt-d: Make sure RMRRs are mapped before domain goes public 



When a domain is allocated through the get_valid_domain_for_dev
path, it will be context-mapped before the RMRR regions are
mapped in the page-table. This opens a short time window
where device-accesses to these regions fail and causing DMAR
faults.

Fix this by mapping the RMRR regions before the domain is
context-mapped.

Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 76208356

drivers/iommu/intel-iommu.c

+20 −7
Original line number Diff line number Diff line
@@ -3428,17 +3428,18 @@ static unsigned long intel_alloc_iova(struct device *dev, 


static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)

{

	struct dmar_domain *domain, *tmp;

	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) {

		pr_err("Allocating domain for %s failed\n",

		       dev_name(dev));

		return NULL;

	}

	domain = find_domain(dev);

	if (domain)

		goto out;



	domain = find_or_alloc_domain(dev, DEFAULT_DOMAIN_ADDRESS_WIDTH);

	if (!domain)

		goto out;



	/* We have a new domain - setup possible RMRRs for the device */

	rcu_read_lock();
@@ -3457,6 +3458,18 @@ static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev) 
	}

	rcu_read_unlock();



	tmp = set_domain_for_dev(dev, domain);

	if (!tmp || domain != tmp) {

		domain_exit(domain);

		domain = tmp;

	}



out:



	if (!domain)

		pr_err("Allocating domain for %s failed\n", dev_name(dev));





	return domain;

}

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