1 // SPDX-License-Identifier: GPL-2.0 2 3 #include <linux/pfn.h> 4 #include <asm/xen/page.h> 5 #include <asm/xen/hypercall.h> 6 #include <xen/interface/memory.h> 7 8 #include "xen-ops.h" 9 10 unsigned long arbitrary_virt_to_mfn(void *vaddr) 11 { 12 xmaddr_t maddr = arbitrary_virt_to_machine(vaddr); 13 14 return PFN_DOWN(maddr.maddr); 15 } 16 17 xmaddr_t arbitrary_virt_to_machine(void *vaddr) 18 { 19 unsigned long address = (unsigned long)vaddr; 20 unsigned int level; 21 pte_t *pte; 22 unsigned offset; 23 24 /* 25 * if the PFN is in the linear mapped vaddr range, we can just use 26 * the (quick) virt_to_machine() p2m lookup 27 */ 28 if (virt_addr_valid(vaddr)) 29 return virt_to_machine(vaddr); 30 31 /* otherwise we have to do a (slower) full page-table walk */ 32 33 pte = lookup_address(address, &level); 34 BUG_ON(pte == NULL); 35 offset = address & ~PAGE_MASK; 36 return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset); 37 } 38 EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine); 39 40 /* Returns: 0 success */ 41 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma, 42 int nr, struct page **pages) 43 { 44 if (xen_feature(XENFEAT_auto_translated_physmap)) 45 return xen_xlate_unmap_gfn_range(vma, nr, pages); 46 47 if (!pages) 48 return 0; 49 50 return -EINVAL; 51 } 52 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range); 53