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 "multicalls.h" 9 #include "mmu.h" 10 11 unsigned long arbitrary_virt_to_mfn(void *vaddr) 12 { 13 xmaddr_t maddr = arbitrary_virt_to_machine(vaddr); 14 15 return PFN_DOWN(maddr.maddr); 16 } 17 18 xmaddr_t arbitrary_virt_to_machine(void *vaddr) 19 { 20 unsigned long address = (unsigned long)vaddr; 21 unsigned int level; 22 pte_t *pte; 23 unsigned offset; 24 25 /* 26 * if the PFN is in the linear mapped vaddr range, we can just use 27 * the (quick) virt_to_machine() p2m lookup 28 */ 29 if (virt_addr_valid(vaddr)) 30 return virt_to_machine(vaddr); 31 32 /* otherwise we have to do a (slower) full page-table walk */ 33 34 pte = lookup_address(address, &level); 35 BUG_ON(pte == NULL); 36 offset = address & ~PAGE_MASK; 37 return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset); 38 } 39 EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine); 40 41 /* Returns: 0 success */ 42 int xen_unmap_domain_gfn_range(struct vm_area_struct *vma, 43 int nr, struct page **pages) 44 { 45 if (xen_feature(XENFEAT_auto_translated_physmap)) 46 return xen_xlate_unmap_gfn_range(vma, nr, pages); 47 48 if (!pages) 49 return 0; 50 51 return -EINVAL; 52 } 53 EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range); 54