On 10/28/2016 11:31 AM, Jike Song wrote:
> On 10/27/2016 08:24 PM, Kirti Wankhede wrote:
>>
>>
>> On 10/27/2016 5:41 PM, Jike Song wrote:
>>> On 10/27/2016 05:29 AM, Kirti Wankhede wrote:
>>>> Update arguments of vaddr_get_pfn() to take struct mm_struct *mm as input
>>>> argument.
>>>>
>>>> Signed-off-by: Kirti Wankhede <kwankhede@xxxxxxxxxx>
>>>> Signed-off-by: Neo Jia <cjia@xxxxxxxxxx>
>>>> Change-Id: I885fd4cd4a9f66f4ee2c1caf58267464ec239f52
>>>> ---
>>>> drivers/vfio/vfio_iommu_type1.c | 25 ++++++++++++++++++-------
>>>> 1 file changed, 18 insertions(+), 7 deletions(-)
>>>>
>>>> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
>>>> index 72fee415044a..3d916b965492 100644
>>>> --- a/drivers/vfio/vfio_iommu_type1.c
>>>> +++ b/drivers/vfio/vfio_iommu_type1.c
>>>> @@ -228,20 +228,31 @@ static int put_pfn(unsigned long pfn, int prot)
>>>> return 0;
>>>> }
>>>>
>>>> -static int vaddr_get_pfn(unsigned long vaddr, int prot, unsigned long *pfn)
>>>> +static int vaddr_get_pfn(struct mm_struct *remote_mm, unsigned long vaddr,
>>>> + int prot, unsigned long *pfn)
>>>> {
>>>> struct page *page[1];
>>>> struct vm_area_struct *vma;
>>>> + struct mm_struct *mm = (remote_mm ? remote_mm : current->mm);
>>>> int ret = -EFAULT;
>>>>
>>>> - if (get_user_pages_fast(vaddr, 1, !!(prot & IOMMU_WRITE), page) == 1) {
>>>> + if (remote_mm) {
>>>> + down_read(&mm->mmap_sem);
>>>> + ret = get_user_pages_remote(NULL, mm, vaddr, 1,
>>>> + !!(prot & IOMMU_WRITE), 0, page, NULL);
>>>
>>> Hi Kirti,
>>>
>>> It seems that get_user_pages_remote has only 7 args but you somehow gives 8
>>> here?
>>>
>>
>> I had tested this patch with linux-next. It has 8 arguments, see mm/gup.c:
>>
>> long get_user_pages_remote(struct task_struct *tsk, struct mm_struct *mm,
>> unsigned long start, unsigned long nr_pages,
>> int write, int force, struct page **pages,
>> struct vm_area_struct **vmas)
>> {
>> return __get_user_pages_locked(tsk, mm, start, nr_pages, write,
>> force,
>> pages, vmas, NULL, false,
>> FOLL_TOUCH | FOLL_REMOTE);
>> }
>> EXPORT_SYMBOL(get_user_pages_remote);
>
> It's queer. I checked:
>
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/tree/mm/gup.c
>
> It still has 7 args.
>
> I believe you have seen this change somewhere, would you share the repo url
> and branch name of the linux-next you based on?
>
Sorry, my git was synced just few changes behind this change. I'll make
sure that I test the patch set at top of tree.
Thanks,
Kirti
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