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x86/amd-iommu: Introduce increase_address_space function

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This function will be used to increase the address space
size of a protection domain.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel
2009-09-02 15:38:40 +02:00
parent 04bfdd8406
commit 50020fb632
2 changed files with 31 additions and 0 deletions
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27
arch/x86/kernel/amd_iommu.c
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@@ -1324,6 +1324,33 @@ static void update_domain(struct protection_domain *domain)
domain->updated = false;
}
/*
* This function is used to add another level to an IO page table. Adding
* another level increases the size of the address space by 9 bits to a size up
* to 64 bits.
*/
static bool increase_address_space(struct protection_domain *domain,
gfp_t gfp)
{
u64 *pte;
if (domain->mode == PAGE_MODE_6_LEVEL)
/* address space already 64 bit large */
return false;
pte = (void *)get_zeroed_page(gfp);
if (!pte)
return false;
*pte = PM_LEVEL_PDE(domain->mode,
virt_to_phys(domain->pt_root));
domain->pt_root = pte;
domain->mode += 1;
domain->updated = true;
return true;
}
/*
* If the pte_page is not yet allocated this function is called
*/