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Subject[PATCH 08/10] iommu/vtd: assign new page table for dma_map
Date
When a device driver issues the first dma_map command for a
device, we assign a new and empty page-table, thus removing all
mappings from the old kernel for the device.

Signed-off-by: Li, Zhen-Hua <zhen-hual@hp.com>
---
drivers/iommu/intel-iommu.c | 27 ++++++++++++++++++++-------
1 file changed, 20 insertions(+), 7 deletions(-)

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 4837ce5..f11a9b1 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -3200,15 +3200,28 @@ static struct dmar_domain *__get_valid_domain_for_dev(struct device *dev)
}

/* make sure context mapping is ok */
- if (unlikely(!domain_context_mapped(dev))) {
- ret = domain_context_mapping(domain, dev, CONTEXT_TT_MULTI_LEVEL);
- if (ret) {
- printk(KERN_ERR "Domain context map for %s failed",
- dev_name(dev));
- return NULL;
- }
+ if (likely(domain_context_mapped(dev))) {
+#ifdef CONFIG_CRASH_DUMP
+ if (is_kdump_kernel()) {
+ domain_exit(domain);
+ domain = get_domain_for_dev(dev,
+ DEFAULT_DOMAIN_ADDRESS_WIDTH);
+ if (!domain) {
+ pr_err("Allocating domain for %s failed",
+ dev_name(dev));
+ return NULL;
+ }
+ } else
+#endif
+ return domain;
}

+ ret = domain_context_mapping(domain, dev, CONTEXT_TT_MULTI_LEVEL);
+ if (ret) {
+ pr_err("Domain context map for %s failed",
+ dev_name(dev));
+ return NULL;
+ }
return domain;
}

--
2.0.0-rc0


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