https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: 136057256686de39cc3a07c2e39ef6bc43003ff6 authored by Linus Torvalds on 21 November 2021, 21:47:39 UTC
Linux 5.16-rc2
Linux 5.16-rc2
Tip revision: 1360572
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);