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
11unsigned 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
18xmaddr_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}
39EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
40
41/* Returns: 0 success */
42int 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}
53EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);

 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
10unsigned 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
17xmaddr_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}
38EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
39
40/* Returns: 0 success */
41int 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}
52EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);