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iommu/vt-d: Allocate dynamic domain id for virtual domains only
Check the same domain id is allocated for si_domain on each IOMMU, otherwise the IOTLB flush for si_domain will fail. Now the rules to allocate and manage domain id are: 1) For normal and static identity domains, domain id is allocated when creating domain structure. And this id will be written into context entry. 2) For virtual machine domain, a virtual id is allocated when creating domain. And when binding virtual machine domain to an iommu, a real domain id is allocated on demand and this domain id will be written into context entry. So domain->id for virtual machine domain may be different from the domain id written into context entry(used by hardware). Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Signed-off-by: Joerg Roedel <jroedel@suse.de>
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fb170fb4c5
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44bde61428
@ -1549,15 +1549,27 @@ static int iommu_attach_domain(struct dmar_domain *domain,
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spin_lock_irqsave(&iommu->lock, flags);
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spin_lock_irqsave(&iommu->lock, flags);
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num = __iommu_attach_domain(domain, iommu);
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num = __iommu_attach_domain(domain, iommu);
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spin_unlock_irqrestore(&iommu->lock, flags);
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if (num < 0)
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if (num < 0)
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pr_err("IOMMU: no free domain ids\n");
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pr_err("IOMMU: no free domain ids\n");
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else
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domain->id = num;
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spin_unlock_irqrestore(&iommu->lock, flags);
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return num;
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return num;
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}
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}
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static int iommu_attach_vm_domain(struct dmar_domain *domain,
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struct intel_iommu *iommu)
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{
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int num;
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unsigned long ndomains;
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ndomains = cap_ndoms(iommu->cap);
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for_each_set_bit(num, iommu->domain_ids, ndomains)
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if (iommu->domains[num] == domain)
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return num;
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return __iommu_attach_domain(domain, iommu);
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}
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static void iommu_detach_domain(struct dmar_domain *domain,
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static void iommu_detach_domain(struct dmar_domain *domain,
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struct intel_iommu *iommu)
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struct intel_iommu *iommu)
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{
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{
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@ -1764,8 +1776,6 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
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struct context_entry *context;
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struct context_entry *context;
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unsigned long flags;
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unsigned long flags;
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struct dma_pte *pgd;
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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 id;
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int agaw;
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int agaw;
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struct device_domain_info *info = NULL;
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struct device_domain_info *info = NULL;
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@ -1790,20 +1800,8 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
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pgd = domain->pgd;
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pgd = domain->pgd;
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if (domain_type_is_vm_or_si(domain)) {
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if (domain_type_is_vm_or_si(domain)) {
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int found = 0;
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if (domain_type_is_vm(domain)) {
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id = iommu_attach_vm_domain(domain, iommu);
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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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for_each_set_bit(num, iommu->domain_ids, 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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}
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if (found == 0) {
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id = __iommu_attach_domain(domain, iommu);
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if (id < 0) {
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if (id < 0) {
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spin_unlock_irqrestore(&iommu->lock, flags);
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spin_unlock_irqrestore(&iommu->lock, flags);
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pr_err("IOMMU: no free domain ids\n");
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pr_err("IOMMU: no free domain ids\n");
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@ -2257,8 +2255,8 @@ static struct dmar_domain *get_domain_for_dev(struct device *dev, int gaw)
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domain = alloc_domain(0);
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domain = alloc_domain(0);
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if (!domain)
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if (!domain)
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return NULL;
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return NULL;
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domain->id = iommu_attach_domain(domain, iommu);
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if (iommu_attach_domain(domain, iommu) < 0) {
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if (domain->id < 0) {
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free_domain_mem(domain);
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free_domain_mem(domain);
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return NULL;
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return NULL;
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}
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}
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@ -2428,6 +2426,7 @@ static int __init si_domain_init(int hw)
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struct dmar_drhd_unit *drhd;
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struct dmar_drhd_unit *drhd;
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struct intel_iommu *iommu;
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struct intel_iommu *iommu;
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int nid, ret = 0;
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int nid, ret = 0;
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bool first = true;
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si_domain = alloc_domain(DOMAIN_FLAG_STATIC_IDENTITY);
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si_domain = alloc_domain(DOMAIN_FLAG_STATIC_IDENTITY);
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if (!si_domain)
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if (!si_domain)
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@ -2438,6 +2437,12 @@ static int __init si_domain_init(int hw)
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if (ret < 0) {
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if (ret < 0) {
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domain_exit(si_domain);
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domain_exit(si_domain);
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return -EFAULT;
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return -EFAULT;
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} else if (first) {
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si_domain->id = ret;
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first = false;
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} else if (si_domain->id != ret) {
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domain_exit(si_domain);
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return -EFAULT;
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}
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}
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domain_attach_iommu(si_domain, iommu);
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domain_attach_iommu(si_domain, iommu);
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}
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}
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