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>
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@ -580,17 +580,18 @@ static void domain_update_iommu_snooping(struct dmar_domain *domain)
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static void domain_update_iommu_superpage(struct dmar_domain *domain)
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{
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int i, mask = 0xf;
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struct dmar_drhd_unit *drhd;
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struct intel_iommu *iommu = NULL;
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int mask = 0xf;
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if (!intel_iommu_superpage) {
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domain->iommu_superpage = 0;
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return;
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}
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domain->iommu_superpage = 4; /* 1TiB */
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for_each_set_bit(i, &domain->iommu_bmp, g_num_of_iommus) {
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mask |= cap_super_page_val(g_iommus[i]->cap);
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/* set iommu_superpage to the smallest common denominator */
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for_each_active_iommu(iommu, drhd) {
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mask &= cap_super_page_val(iommu->cap);
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if (!mask) {
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break;
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}
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@ -3748,6 +3749,7 @@ static int intel_iommu_domain_init(struct iommu_domain *domain)
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vm_domain_exit(dmar_domain);
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return -ENOMEM;
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}
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domain_update_iommu_cap(dmar_domain);
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domain->priv = dmar_domain;
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return 0;
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