/* get_page() to prevent another vcpu freeing the page. */
static int
xencomm_get_page(unsigned long paddr, struct page_info **page)
{
unsigned long maddr = paddr_to_maddr(paddr);
if ( maddr == 0 )
return -EFAULT;
*page = maddr_to_page(maddr);
if ( get_page(*page, current->domain) == 0 )
{
if ( page_get_owner(*page) != current->domain )
{
/*
* This page might be a page granted by another domain, or
* this page is freed with decrease reservation hypercall at
* the same time.
*/
gdprintk(XENLOG_WARNING,
"bad page is passed. paddr 0x%lx maddr 0x%lx\n",
paddr, maddr);
return -EFAULT;
}
/* Try again. */
cpu_relax();
return -EAGAIN;
}
return 0;
}
static void
xenoprof_shared_gmfn_with_guest(
struct domain *d, unsigned long maddr, unsigned long gmaddr, int npages)
{
int i;
for ( i = 0; i < npages; i++, maddr += PAGE_SIZE, gmaddr += PAGE_SIZE )
{
BUG_ON(page_get_owner(maddr_to_page(maddr)) != d);
xenoprof_shared_gmfn(d, gmaddr, maddr);
}
}
static u64 iommu_l2e_from_pfn(struct page_info *table, int level,
unsigned long io_pfn)
{
unsigned long offset;
void *pde = NULL;
void *table_vaddr;
u64 next_table_maddr = 0;
BUG_ON( table == NULL || level == 0 );
while ( level > 1 )
{
offset = io_pfn >> ((PTE_PER_TABLE_SHIFT *
(level - IOMMU_PAGING_MODE_LEVEL_1)));
offset &= ~PTE_PER_TABLE_MASK;
table_vaddr = map_domain_page(page_to_mfn(table));
pde = table_vaddr + (offset * IOMMU_PAGE_TABLE_ENTRY_SIZE);
next_table_maddr = amd_iommu_get_next_table_from_pte(pde);
if ( !amd_iommu_is_pte_present(pde) )
{
if ( next_table_maddr == 0 )
{
table = alloc_amd_iommu_pgtable();
if ( table == NULL )
return 0;
next_table_maddr = page_to_maddr(table);
amd_iommu_set_page_directory_entry(
(u32 *)pde, next_table_maddr, level - 1);
}
else /* should never reach here */
return 0;
}
unmap_domain_page(table_vaddr);
table = maddr_to_page(next_table_maddr);
level--;
}
return next_table_maddr;
}
void free_pgtable_maddr(u64 maddr)
{
if ( maddr != 0 )
free_domheap_page(maddr_to_page(maddr));
}
