Re: [Xen-devel] [PATCH] [v2] xen: avoid link error on ARM

[Juergen Gross <jgross@xxxxxxxx>]

On 05/03/2019 14:43, Boris Ostrovsky wrote:
> On 3/5/19 8:30 AM, Arnd Bergmann wrote:
>>  
>> diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
>> index b24ddac1604b..290b6aca7e1d 100644
>> --- a/drivers/xen/privcmd.c
>> +++ b/drivers/xen/privcmd.c
>> @@ -723,26 +723,6 @@ static long privcmd_ioctl_restrict(struct file *file, 
>> void __user *udata)
>>      return 0;
>>  }
>>  
>> -struct remap_pfn {
>> -    struct mm_struct *mm;
>> -    struct page **pages;
>> -    pgprot_t prot;
>> -    unsigned long i;
>> -};
>> -
>> -static int remap_pfn_fn(pte_t *ptep, pgtable_t token, unsigned long addr,
>> -                    void *data)
>> -{
>> -    struct remap_pfn *r = data;
>> -    struct page *page = r->pages[r->i];
>> -    pte_t pte = pte_mkspecial(pfn_pte(page_to_pfn(page), r->prot));
>> -
>> -    set_pte_at(r->mm, addr, ptep, pte);
>> -    r->i++;
>> -
>> -    return 0;
>> -}
>> -
>>  static long privcmd_ioctl_mmap_resource(struct file *file, void __user 
>> *udata)
>>  {
>>      struct privcmd_data *data = file->private_data;
>> @@ -809,15 +789,7 @@ static long privcmd_ioctl_mmap_resource(struct file 
>> *file, void __user *udata)
>>              goto out;
>>  
>>      if (xen_feature(XENFEAT_auto_translated_physmap)) {
>> -            struct remap_pfn r = {
>> -                    .mm = vma->vm_mm,
>> -                    .pages = vma->vm_private_data,
>> -                    .prot = vma->vm_page_prot,
>> -            };
>> -
>> -            rc = apply_to_page_range(r.mm, kdata.addr,
>> -                                     kdata.num << PAGE_SHIFT,
>> -                                     remap_pfn_fn, &r);
>> +            rc = xen_remap_vma_range(vma, kdata.addr, kdata.num << 
>> PAGE_SHIFT);
> 
> I wonder whether drivers/xen/xlate_mmu.c might be a good place for these
> routines.

Hmm, probably. This would require a stub in the header to avoid
problems in case of CONFIG_XEN_AUTO_XLATE not defined, though
(the #ifdef is already there).

I think this is the cleanest solution.


Juergen

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