[mirror_ubuntu-eoan-kernel.git] / arch / x86 / xen / mmu.c

// SPDX-License-Identifier: GPL-2.0

#include <linux/pfn.h>
#include <asm/xen/page.h>
#include <asm/xen/hypercall.h>
#include <xen/interface/memory.h>

#include "multicalls.h"
#include "mmu.h"

unsigned long arbitrary_virt_to_mfn(void *vaddr)
{
	xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);

	return PFN_DOWN(maddr.maddr);
}

xmaddr_t arbitrary_virt_to_machine(void *vaddr)
{
	unsigned long address = (unsigned long)vaddr;
	unsigned int level;
	pte_t *pte;
	unsigned offset;

	/*
	 * if the PFN is in the linear mapped vaddr range, we can just use
	 * the (quick) virt_to_machine() p2m lookup
	 */
	if (virt_addr_valid(vaddr))
		return virt_to_machine(vaddr);

	/* otherwise we have to do a (slower) full page-table walk */

	pte = lookup_address(address, &level);
	BUG_ON(pte == NULL);
	offset = address & ~PAGE_MASK;
	return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
}
EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);

/* Returns: 0 success */
int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
			       int nr, struct page **pages)
{
	if (xen_feature(XENFEAT_auto_translated_physmap))
		return xen_xlate_unmap_gfn_range(vma, nr, pages);

	if (!pages)
		return 0;

	return -EINVAL;
}
EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
Commit	Line	Data
901d209a JG	1	// SPDX-License-Identifier: GPL-2.0
901d209a JG	2
7e0563de VK	3	#include <linux/pfn.h>
	4	#include <asm/xen/page.h>
	5	#include <asm/xen/hypercall.h>
	6	#include <xen/interface/memory.h>
70e61199	7
7e0563de VK	8	#include "multicalls.h"
7e0563de VK	9	#include "mmu.h"
70e61199	10
7e0563de	11	unsigned long arbitrary_virt_to_mfn(void *vaddr)
70e61199	12	{
7e0563de	13	xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
70e61199	14
7e0563de	15	return PFN_DOWN(maddr.maddr);
70e61199 JG	16	}
70e61199 JG	17
7e0563de	18	xmaddr_t arbitrary_virt_to_machine(void *vaddr)
5b5c1af1	19	{
7e0563de VK	20	unsigned long address = (unsigned long)vaddr;
	21	unsigned int level;
	22	pte_t *pte;
	23	unsigned offset;
5b5c1af1 IC	24
5b5c1af1 IC	25	/*
7e0563de VK	26	* if the PFN is in the linear mapped vaddr range, we can just use
7e0563de VK	27	* the (quick) virt_to_machine() p2m lookup
5b5c1af1	28	*/
7e0563de VK	29	if (virt_addr_valid(vaddr))
7e0563de VK	30	return virt_to_machine(vaddr);
20f36e03	31
7e0563de	32	/* otherwise we have to do a (slower) full page-table walk */
d2cb2145	33
7e0563de VK	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);
030cb6c0	38	}
7e0563de	39	EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
319f3ba5	40
9a032e39	41	/* Returns: 0 success */
a13d7201	42	int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
ec4001c3	43	int nr, struct page **pages)
9a032e39	44	{
ec4001c3 PD	45	if (xen_feature(XENFEAT_auto_translated_physmap))
	46	return xen_xlate_unmap_gfn_range(vma, nr, pages);
	47
	48	if (!pages)
9a032e39 IC	49	return 0;
	50
	51	return -EINVAL;
	52	}
a13d7201	53	EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);