From 2c3c1048746a4622d8c89a29670120dc8fab93c4 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 20:49:45 +0200 Subject: Adding upstream version 6.1.76. Signed-off-by: Daniel Baumann --- arch/x86/xen/mmu.c | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 arch/x86/xen/mmu.c (limited to 'arch/x86/xen/mmu.c') diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c new file mode 100644 index 000000000..60e9c37fd --- /dev/null +++ b/arch/x86/xen/mmu.c @@ -0,0 +1,53 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include + +#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); -- cgit v1.2.3