54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/pfn.h>
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#include <asm/xen/page.h>
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#include <asm/xen/hypercall.h>
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#include <xen/interface/memory.h>
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#include "multicalls.h"
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#include "mmu.h"
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unsigned long arbitrary_virt_to_mfn(void *vaddr)
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{
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xmaddr_t maddr = arbitrary_virt_to_machine(vaddr);
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return PFN_DOWN(maddr.maddr);
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}
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xmaddr_t arbitrary_virt_to_machine(void *vaddr)
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{
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unsigned long address = (unsigned long)vaddr;
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unsigned int level;
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pte_t *pte;
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unsigned offset;
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/*
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* if the PFN is in the linear mapped vaddr range, we can just use
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* the (quick) virt_to_machine() p2m lookup
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*/
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if (virt_addr_valid(vaddr))
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return virt_to_machine(vaddr);
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/* otherwise we have to do a (slower) full page-table walk */
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pte = lookup_address(address, &level);
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BUG_ON(pte == NULL);
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offset = address & ~PAGE_MASK;
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return XMADDR(((phys_addr_t)pte_mfn(*pte) << PAGE_SHIFT) + offset);
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}
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EXPORT_SYMBOL_GPL(arbitrary_virt_to_machine);
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/* Returns: 0 success */
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int xen_unmap_domain_gfn_range(struct vm_area_struct *vma,
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int nr, struct page **pages)
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{
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return xen_xlate_unmap_gfn_range(vma, nr, pages);
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if (!pages)
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return 0;
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(xen_unmap_domain_gfn_range);
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