Re: [Xen-devel] Where and How the P2M table and M2P table create?

["Zhang, Chunyu" <zhangcy@xxxxxxxxxxxxxx>]

hi

this may help you。。。


hvm_vcpu_initialise 
  - .vcpu_initialise  = vmx_vcpu_initialise,
　　- vmx_create_vmcs
　　  - construct_vmcs
　　    -     if ( paging_mode_hap(d) )
　　          {
　　             struct p2m_domain *p2m = p2m_get_hostp2m(d);
　　             struct ept_data *ept = &p2m->ept;
　　
　　             ept->asr  = pagetable_get_pfn(p2m_get_pagetable(p2m));
　　             __vmwrite(EPT_POINTER, ept_get_eptp(ept));
　　           }

main --> main_create --> create_domain --> libxl_domain_create_new 
--> do_domain_create --> initiate_domain_create -->  libxl__bootloader_run
 --> libxl__device_disk_local_initiate_detach --> local_device_detach_cb 
--> bootloader_local_detached_cb --> domcreate_bootloader_done --> 
libxl__domain_build
 --> libxl__build_hvm --> libxl__build_dom --> xc_dom_boot_mem_init -->
 meminit_hvm
  --> xc_domain_populate_physmap 
     -->  err = do_memory_op(xch, XENMEM_populate_physmap, &reservation);


- do_memory_op(xch, XENMEM_populate_physmap, &reservation)  (memory.c)
  - populate_physmap
　　- is_domain_direct_mapped
　　   - mfn = gpfn
　　   - put_page
　　- else
　　 - page = alloc_domheap_pages(d, a->extent_order, a->memflags);
　　 - mfn = page_to_mfn(page);
　　 - guest_physmap_add_page(d, gpfn, mfn, a->extent_order);
　　 - guest_physmap_add_entry(d, gfn, mfn, page_order, p2m_ram_rw)
　　   /* First, remove m->p mappings for existing p->m mappings */
　　   -  for ( i = 0; i < (1UL << page_order); i++ )
　　      -  omfn = p2m->get_entry(p2m, gfn + i, &ot, &a, 0, NULL, NULL);
　　         - mfn = _mfn(ept_entry->mfn)  
　　      -  set_gpfn_from_mfn
　　         - _set_gpfn_from_mfn(mfn, pfn)
　　           - machine_to_phys_mapping[(mfn)] = (entry) 
　　   /* Then, look for m->p mappings for this range and deal with them */
　　   /* Now, actually do the two-way mapping */
　　   -   rc = p2m_set_entry(p2m, gfn, _mfn(mfn), page_order, t,
　　                           p2m->default_access);
　　   -    set_gpfn_from_mfn(mfn+i, gfn+i);   
>Hi,alls,
>
>As we know,in xen ,when create shadow page table and EPT page table,we need 
>the p2m and m2p.I want to know when are the p2m been created.Was it created at 
>the time of the creation of the domainU？Or at the beginning is a empty table 
>and in the subsequent gradually established?
>
>And how was it been created?
>
>Thanks!
>
>

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