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x86/amd-iommu: Add core functions for pd allocation/freeing 

This patch factors some code of protection domain allocation
into seperate functions. This way the logic can be used to
allocate the passthrough domain later. As a side effect this
patch fixes an unlikely domain id leakage bug.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-08-26 16:52:40 +02:00
parent ac0101d396
commit 2650815fb0
1 changed files with 32 additions and 4 deletions
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36
arch/x86/kernel/amd_iommu.c
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@ -1988,19 +1988,47 @@ static void cleanup_domain(struct protection_domain *domain)
write_unlock_irqrestore(&amd_iommu_devtable_lock, flags);
}
static int amd_iommu_domain_init(struct iommu_domain *dom)
static void protection_domain_free(struct protection_domain *domain)
{
if (!domain)
return;
if (domain->id)
domain_id_free(domain->id);
kfree(domain);
}
static struct protection_domain *protection_domain_alloc(void)
{
struct protection_domain *domain;
domain = kzalloc(sizeof(*domain), GFP_KERNEL);
if (!domain)
return -ENOMEM;
return NULL;
spin_lock_init(&domain->lock);
domain->mode = PAGE_MODE_3_LEVEL;
domain->id = domain_id_alloc();
if (!domain->id)
goto out_err;
return domain;
out_err:
kfree(domain);
return NULL;
}
static int amd_iommu_domain_init(struct iommu_domain *dom)
{
struct protection_domain *domain;
domain = protection_domain_alloc();
if (!domain)
goto out_free;
domain->mode = PAGE_MODE_3_LEVEL;
domain->pt_root = (void *)get_zeroed_page(GFP_KERNEL);
if (!domain->pt_root)
goto out_free;
@ -2010,7 +2038,7 @@ static int amd_iommu_domain_init(struct iommu_domain *dom)
return 0;
out_free:
kfree(domain);
protection_domain_free(domain);
return -ENOMEM;
}