| 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(address: 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: &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 |