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iommu/vt-d: fix a race window in allocating domain ID for virtual machines

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Function intel_iommu_domain_init() may be concurrently called by upper
layer without serialization, so use atomic_t to protect domain id
allocation.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Joerg Roedel <joro@8bytes.org>
This commit is contained in:
Jiang Liu 2014-01-06 14:18:10 +08:00 committed by Joerg Roedel
parent ada4d4b2a3
commit 18d99165d3
1 changed files with 2 additions and 2 deletions
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4
drivers/iommu/intel-iommu.c
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@ -3877,7 +3877,7 @@ static void vm_domain_remove_all_dev_info(struct dmar_domain *domain)
}
/* domain id for virtual machine, it won't be set in context */
static unsigned long vm_domid;
static atomic_t vm_domid = ATOMIC_INIT(0);
static struct dmar_domain *iommu_alloc_vm_domain(void)
{
@ -3887,7 +3887,7 @@ static struct dmar_domain *iommu_alloc_vm_domain(void)
if (!domain)
return NULL;
domain->id = vm_domid++;
domain->id = atomic_inc_return(&vm_domid);
domain->nid = -1;
memset(domain->iommu_bmp, 0, sizeof(domain->iommu_bmp));
domain->flags = DOMAIN_FLAG_VIRTUAL_MACHINE;