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53 lines
1.2 KiB
53 lines
1.2 KiB
// 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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