Commit 8140a95d authored by Allen Kay's avatar Allen Kay Committed by David Woodhouse
Browse files

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: default avatarAllen Kay <>
Signed-off-by: default avatarDavid Woodhouse <>
parent 292827cb
......@@ -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;
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) {
......@@ -3748,6 +3749,7 @@ static int intel_iommu_domain_init(struct iommu_domain *domain)
return -ENOMEM;
domain->priv = dmar_domain;
return 0;
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