Change domain_context_mapping_one for virtual machine domain
vm_domid won't be set in context, find available domain id for a device from its iommu. For a virtual machine domain, a default agaw will be set, and skip top levels of page tables for iommu which has less agaw than default. Signed-off-by: Weidong Han <weidong.han@intel.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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@ -1454,6 +1454,11 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
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struct context_entry *context;
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unsigned long flags;
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struct intel_iommu *iommu;
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struct dma_pte *pgd;
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unsigned long num;
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unsigned long ndomains;
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int id;
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int agaw;
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pr_debug("Set context mapping for %02x:%02x.%d\n",
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bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
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@ -1472,9 +1477,53 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
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return 0;
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}
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context_set_domain_id(context, domain->id);
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context_set_address_width(context, domain->agaw);
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context_set_address_root(context, virt_to_phys(domain->pgd));
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id = domain->id;
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pgd = domain->pgd;
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if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) {
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int found = 0;
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/* find an available domain id for this device in iommu */
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ndomains = cap_ndoms(iommu->cap);
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num = find_first_bit(iommu->domain_ids, ndomains);
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for (; num < ndomains; ) {
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if (iommu->domains[num] == domain) {
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id = num;
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found = 1;
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break;
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}
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num = find_next_bit(iommu->domain_ids,
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cap_ndoms(iommu->cap), num+1);
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}
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if (found == 0) {
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num = find_first_zero_bit(iommu->domain_ids, ndomains);
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if (num >= ndomains) {
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spin_unlock_irqrestore(&iommu->lock, flags);
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printk(KERN_ERR "IOMMU: no free domain ids\n");
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return -EFAULT;
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}
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set_bit(num, iommu->domain_ids);
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iommu->domains[num] = domain;
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id = num;
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}
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/* Skip top levels of page tables for
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* iommu which has less agaw than default.
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*/
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for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
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pgd = phys_to_virt(dma_pte_addr(pgd));
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if (!dma_pte_present(pgd)) {
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spin_unlock_irqrestore(&iommu->lock, flags);
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return -ENOMEM;
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}
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}
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}
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context_set_domain_id(context, id);
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context_set_address_width(context, iommu->agaw);
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context_set_address_root(context, virt_to_phys(pgd));
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context_set_translation_type(context, CONTEXT_TT_MULTI_LEVEL);
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context_set_fault_enable(context);
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context_set_present(context);
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