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authorAllen Kay <allen.m.kay@intel.com>2011-10-14 12:32:17 -0700
committerDavid Woodhouse <David.Woodhouse@intel.com>2011-10-19 12:06:20 +0100
commit8140a95d228efbcd64d84150e794761a32463947 (patch)
tree5eb55b8a23f8f015ddfcb6b6e0f8e7db9a9456da
parent292827cb164ad00cc7689a21283b1261c0b6daed (diff)
intel-iommu: set iommu_superpage on VM domains to lowest common denominator
set dmar->iommu_superpage field to the smallest common denominator of super page sizes supported by all active VT-d engines. Initialize this field in intel_iommu_domain_init() API so intel_iommu_map() API will be able to use iommu_superpage field to determine the appropriate super page size to use. Signed-off-by: Allen Kay <allen.m.kay@intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
-rw-r--r--drivers/iommu/intel-iommu.c12
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 237ef52c8c76..e5883602cb35 100644
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -580,17 +580,18 @@ static void domain_update_iommu_snooping(struct dmar_domain *domain)
static void domain_update_iommu_superpage(struct dmar_domain *domain)
{
- int i, mask = 0xf;
+ struct dmar_drhd_unit *drhd;
+ struct intel_iommu *iommu = NULL;
+ int mask = 0xf;
if (!intel_iommu_superpage) {
domain->iommu_superpage = 0;
return;
}
- domain->iommu_superpage = 4; /* 1TiB */
-
- for_each_set_bit(i, &domain->iommu_bmp, g_num_of_iommus) {
- mask |= cap_super_page_val(g_iommus[i]->cap);
+ /* set iommu_superpage to the smallest common denominator */
+ for_each_active_iommu(iommu, drhd) {
+ mask &= cap_super_page_val(iommu->cap);
if (!mask) {
break;
}
@@ -3748,6 +3749,7 @@ static int intel_iommu_domain_init(struct iommu_domain *domain)
vm_domain_exit(dmar_domain);
return -ENOMEM;
}
+ domain_update_iommu_cap(dmar_domain);
domain->priv = dmar_domain;
return 0;

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