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Allocation and free functions of virtual machine domain
virtual machine domain is different from native DMA-API domain, implement separate allocation and free functions for virtual machine domain. Signed-off-by: Weidong Han <weidong.han@intel.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
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5331fe6f56
commit
5e98c4b1d6
1 changed files with 105 additions and 2 deletions
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@ -1216,6 +1216,7 @@ static int iommu_init_domains(struct intel_iommu *iommu)
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static void domain_exit(struct dmar_domain *domain);
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static void domain_exit(struct dmar_domain *domain);
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static void vm_domain_exit(struct dmar_domain *domain);
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void free_dmar_iommu(struct intel_iommu *iommu)
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void free_dmar_iommu(struct intel_iommu *iommu)
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{
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{
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@ -1229,8 +1230,12 @@ void free_dmar_iommu(struct intel_iommu *iommu)
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clear_bit(i, iommu->domain_ids);
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clear_bit(i, iommu->domain_ids);
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spin_lock_irqsave(&domain->iommu_lock, flags);
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spin_lock_irqsave(&domain->iommu_lock, flags);
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if (--domain->iommu_count == 0)
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if (--domain->iommu_count == 0) {
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domain_exit(domain);
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if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE)
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vm_domain_exit(domain);
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else
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domain_exit(domain);
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}
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spin_unlock_irqrestore(&domain->iommu_lock, flags);
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spin_unlock_irqrestore(&domain->iommu_lock, flags);
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i = find_next_bit(iommu->domain_ids,
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i = find_next_bit(iommu->domain_ids,
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@ -2792,6 +2797,104 @@ static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
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spin_unlock_irqrestore(&device_domain_lock, flags1);
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spin_unlock_irqrestore(&device_domain_lock, flags1);
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}
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}
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/* domain id for virtual machine, it won't be set in context */
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static unsigned long vm_domid;
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static struct dmar_domain *iommu_alloc_vm_domain(void)
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{
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struct dmar_domain *domain;
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domain = alloc_domain_mem();
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if (!domain)
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return NULL;
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domain->id = vm_domid++;
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memset(&domain->iommu_bmp, 0, sizeof(unsigned long));
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domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;
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return domain;
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}
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static int vm_domain_init(struct dmar_domain *domain, int guest_width)
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{
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int adjust_width;
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init_iova_domain(&domain->iovad, DMA_32BIT_PFN);
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spin_lock_init(&domain->mapping_lock);
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spin_lock_init(&domain->iommu_lock);
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domain_reserve_special_ranges(domain);
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/* calculate AGAW */
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domain->gaw = guest_width;
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adjust_width = guestwidth_to_adjustwidth(guest_width);
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domain->agaw = width_to_agaw(adjust_width);
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INIT_LIST_HEAD(&domain->devices);
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domain->iommu_count = 0;
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domain->iommu_coherency = 0;
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/* always allocate the top pgd */
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domain->pgd = (struct dma_pte *)alloc_pgtable_page();
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if (!domain->pgd)
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return -ENOMEM;
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domain_flush_cache(domain, domain->pgd, PAGE_SIZE);
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return 0;
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}
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static void iommu_free_vm_domain(struct dmar_domain *domain)
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{
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unsigned long flags;
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struct dmar_drhd_unit *drhd;
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struct intel_iommu *iommu;
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unsigned long i;
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unsigned long ndomains;
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for_each_drhd_unit(drhd) {
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if (drhd->ignored)
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continue;
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iommu = drhd->iommu;
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ndomains = cap_ndoms(iommu->cap);
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i = find_first_bit(iommu->domain_ids, ndomains);
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for (; i < ndomains; ) {
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if (iommu->domains[i] == domain) {
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spin_lock_irqsave(&iommu->lock, flags);
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clear_bit(i, iommu->domain_ids);
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iommu->domains[i] = NULL;
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spin_unlock_irqrestore(&iommu->lock, flags);
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break;
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}
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i = find_next_bit(iommu->domain_ids, ndomains, i+1);
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}
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}
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}
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static void vm_domain_exit(struct dmar_domain *domain)
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{
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u64 end;
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/* Domain 0 is reserved, so dont process it */
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if (!domain)
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return;
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vm_domain_remove_all_dev_info(domain);
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/* destroy iovas */
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put_iova_domain(&domain->iovad);
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end = DOMAIN_MAX_ADDR(domain->gaw);
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end = end & (~VTD_PAGE_MASK);
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/* clear ptes */
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dma_pte_clear_range(domain, 0, end);
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/* free page tables */
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dma_pte_free_pagetable(domain, 0, end);
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iommu_free_vm_domain(domain);
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free_domain_mem(domain);
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}
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void intel_iommu_domain_exit(struct dmar_domain *domain)
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void intel_iommu_domain_exit(struct dmar_domain *domain)
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{
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{
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u64 end;
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u64 end;
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