#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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/*
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* Protects atomic reservation decrease/increase against concurrent increases.
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* Also protects non-atomic updates of current_pages and balloon lists.
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*/
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DEFINE_SPINLOCK(xen_reservation_lock);
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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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static noinline void xen_flush_tlb_all(void)
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{
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struct mmuext_op *op;
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struct multicall_space mcs;
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preempt_disable();
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mcs = xen_mc_entry(sizeof(*op));
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op = mcs.args;
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op->cmd = MMUEXT_TLB_FLUSH_ALL;
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MULTI_mmuext_op(mcs.mc, op, 1, NULL, DOMID_SELF);
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xen_mc_issue(PARAVIRT_LAZY_MMU);
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preempt_enable();
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}
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#define REMAP_BATCH_SIZE 16
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struct remap_data {
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xen_pfn_t *pfn;
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bool contiguous;
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bool no_translate;
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pgprot_t prot;
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struct mmu_update *mmu_update;
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};
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static int remap_area_pfn_pte_fn(pte_t *ptep, pgtable_t token,
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unsigned long addr, void *data)
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{
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struct remap_data *rmd = data;
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pte_t pte = pte_mkspecial(mfn_pte(*rmd->pfn, rmd->prot));
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/*
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* If we have a contiguous range, just update the pfn itself,
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* else update pointer to be "next pfn".
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*/
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if (rmd->contiguous)
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(*rmd->pfn)++;
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else
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rmd->pfn++;
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rmd->mmu_update->ptr = virt_to_machine(ptep).maddr;
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rmd->mmu_update->ptr |= rmd->no_translate ?
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MMU_PT_UPDATE_NO_TRANSLATE :
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MMU_NORMAL_PT_UPDATE;
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rmd->mmu_update->val = pte_val_ma(pte);
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rmd->mmu_update++;
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return 0;
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}
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static int do_remap_pfn(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t *pfn, int nr,
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int *err_ptr, pgprot_t prot,
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unsigned int domid,
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bool no_translate,
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struct page **pages)
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{
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int err = 0;
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struct remap_data rmd;
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struct mmu_update mmu_update[REMAP_BATCH_SIZE];
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unsigned long range;
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int mapped = 0;
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BUG_ON(!((vma->vm_flags & (VM_PFNMAP | VM_IO)) == (VM_PFNMAP | VM_IO)));
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rmd.pfn = pfn;
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rmd.prot = prot;
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/*
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* We use the err_ptr to indicate if there we are doing a contiguous
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* mapping or a discontigious mapping.
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*/
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rmd.contiguous = !err_ptr;
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rmd.no_translate = no_translate;
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while (nr) {
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int index = 0;
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int done = 0;
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int batch = min(REMAP_BATCH_SIZE, nr);
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int batch_left = batch;
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range = (unsigned long)batch << PAGE_SHIFT;
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rmd.mmu_update = mmu_update;
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err = apply_to_page_range(vma->vm_mm, addr, range,
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remap_area_pfn_pte_fn, &rmd);
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if (err)
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goto out;
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/* We record the error for each page that gives an error, but
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* continue mapping until the whole set is done */
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do {
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int i;
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err = HYPERVISOR_mmu_update(&mmu_update[index],
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batch_left, &done, domid);
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/*
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* @err_ptr may be the same buffer as @gfn, so
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* only clear it after each chunk of @gfn is
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* used.
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*/
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if (err_ptr) {
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for (i = index; i < index + done; i++)
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err_ptr[i] = 0;
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}
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if (err < 0) {
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if (!err_ptr)
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goto out;
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err_ptr[i] = err;
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done++; /* Skip failed frame. */
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} else
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mapped += done;
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batch_left -= done;
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index += done;
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} while (batch_left);
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nr -= batch;
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addr += range;
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if (err_ptr)
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err_ptr += batch;
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cond_resched();
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}
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out:
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xen_flush_tlb_all();
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return err < 0 ? err : mapped;
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}
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int xen_remap_domain_gfn_range(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t gfn, int nr,
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pgprot_t prot, unsigned domid,
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struct page **pages)
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{
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return -EOPNOTSUPP;
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return do_remap_pfn(vma, addr, &gfn, nr, NULL, prot, domid, false,
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pages);
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}
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EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_range);
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int xen_remap_domain_gfn_array(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t *gfn, int nr,
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int *err_ptr, pgprot_t prot,
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unsigned domid, 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_remap_gfn_array(vma, addr, gfn, nr, err_ptr,
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prot, domid, pages);
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/* We BUG_ON because it's a programmer error to pass a NULL err_ptr,
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* and the consequences later is quite hard to detect what the actual
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* cause of "wrong memory was mapped in".
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*/
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BUG_ON(err_ptr == NULL);
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return do_remap_pfn(vma, addr, gfn, nr, err_ptr, prot, domid,
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false, pages);
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}
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EXPORT_SYMBOL_GPL(xen_remap_domain_gfn_array);
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int xen_remap_domain_mfn_array(struct vm_area_struct *vma,
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unsigned long addr,
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xen_pfn_t *mfn, int nr,
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int *err_ptr, pgprot_t prot,
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unsigned int domid, struct page **pages)
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{
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if (xen_feature(XENFEAT_auto_translated_physmap))
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return -EOPNOTSUPP;
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return do_remap_pfn(vma, addr, mfn, nr, err_ptr, prot, domid,
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true, pages);
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}
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EXPORT_SYMBOL_GPL(xen_remap_domain_mfn_array);
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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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