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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>
This commit is contained in:
Weidong Han 2008-12-08 23:08:15 +08:00 committed by Joerg Roedel
parent 5e98c4b1d6
commit ea6606b02f
1 changed files with 52 additions and 3 deletions
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55
drivers/pci/intel-iommu.c
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@ -1454,6 +1454,11 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
struct context_entry *context;
unsigned long flags;
struct intel_iommu *iommu;
struct dma_pte *pgd;
unsigned long num;
unsigned long ndomains;
int id;
int agaw;
pr_debug("Set context mapping for %02x:%02x.%d\n",
bus, PCI_SLOT(devfn), PCI_FUNC(devfn));
@ -1472,9 +1477,53 @@ static int domain_context_mapping_one(struct dmar_domain *domain,
return 0;
}
context_set_domain_id(context, domain->id);
context_set_address_width(context, domain->agaw);
context_set_address_root(context, virt_to_phys(domain->pgd));
id = domain->id;
pgd = domain->pgd;
if (domain->flags & DOMAIN_FLAG_VIRTUAL_MACHINE) {
int found = 0;
/* find an available domain id for this device in iommu */
ndomains = cap_ndoms(iommu->cap);
num = find_first_bit(iommu->domain_ids, ndomains);
for (; num < ndomains; ) {
if (iommu->domains[num] == domain) {
id = num;
found = 1;
break;
}
num = find_next_bit(iommu->domain_ids,
cap_ndoms(iommu->cap), num+1);
}
if (found == 0) {
num = find_first_zero_bit(iommu->domain_ids, ndomains);
if (num >= ndomains) {
spin_unlock_irqrestore(&iommu->lock, flags);
printk(KERN_ERR "IOMMU: no free domain ids\n");
return -EFAULT;
}
set_bit(num, iommu->domain_ids);
iommu->domains[num] = domain;
id = num;
}
/* Skip top levels of page tables for
* iommu which has less agaw than default.
*/
for (agaw = domain->agaw; agaw != iommu->agaw; agaw--) {
pgd = phys_to_virt(dma_pte_addr(pgd));
if (!dma_pte_present(pgd)) {
spin_unlock_irqrestore(&iommu->lock, flags);
return -ENOMEM;
}
}
}
context_set_domain_id(context, id);
context_set_address_width(context, iommu->agaw);
context_set_address_root(context, virt_to_phys(pgd));
context_set_translation_type(context, CONTEXT_TT_MULTI_LEVEL);
context_set_fault_enable(context);
context_set_present(context);