From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kirti Wankhede Subject: Re: [PATCH v10 07/19] vfio iommu type1: Update argument of vaddr_get_pfn() Date: Wed, 2 Nov 2016 13:36:47 +0530 Message-ID: <393b09e8-4631-90f4-6cae-755d1c2813f2@nvidia.com> References: <1477517366-27871-1-git-send-email-kwankhede@nvidia.com> <1477517366-27871-8-git-send-email-kwankhede@nvidia.com> <5811EF08.5000602@intel.com> <78a52b28-40c6-076d-030e-6eb4c343d73a@nvidia.com> <5812E9AE.7010209@intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: , , , , , , , , To: Jike Song Return-path: In-Reply-To: <5812E9AE.7010209@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: kvm.vger.kernel.org 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 >>>> Signed-off-by: Neo Jia >>>> 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