On Wed, Oct 7, 2020 at 4:23 PM Daniel Vetter wrote:
>
> On Wed, Oct 7, 2020 at 4:12 PM Tomasz Figa wrote:
> >
> > On Wed, Oct 7, 2020 at 4:09 PM Daniel Vetter wrote:
> > >
> > > On Wed, Oct 7, 2020 at 3:34 PM Tomasz Figa wrote:
> > > >
> > > > On Wed, Oct 7, 2020 at 3:06 PM Jason Gunthorpe
On Wed, Oct 07, 2020 at 04:11:59PM +0200, Tomasz Figa wrote:
> We also need to bring back the vma_open() that somehow disappeared
> around 4.2, as Marek found.
No
Jason
On Wed, Oct 7, 2020 at 4:12 PM Tomasz Figa wrote:
>
> On Wed, Oct 7, 2020 at 4:09 PM Daniel Vetter wrote:
> >
> > On Wed, Oct 7, 2020 at 3:34 PM Tomasz Figa wrote:
> > >
> > > On Wed, Oct 7, 2020 at 3:06 PM Jason Gunthorpe wrote:
> > > >
> > > > On Wed, Oct 07, 2020 at 02:58:33PM +0200, Daniel
On Wed, Oct 7, 2020 at 4:09 PM Daniel Vetter wrote:
>
> On Wed, Oct 7, 2020 at 3:34 PM Tomasz Figa wrote:
> >
> > On Wed, Oct 7, 2020 at 3:06 PM Jason Gunthorpe wrote:
> > >
> > > On Wed, Oct 07, 2020 at 02:58:33PM +0200, Daniel Vetter wrote:
> > > > On Wed, Oct 7, 2020 at 2:48 PM Tomasz Figa
On Wed, Oct 7, 2020 at 3:34 PM Tomasz Figa wrote:
>
> On Wed, Oct 7, 2020 at 3:06 PM Jason Gunthorpe wrote:
> >
> > On Wed, Oct 07, 2020 at 02:58:33PM +0200, Daniel Vetter wrote:
> > > On Wed, Oct 7, 2020 at 2:48 PM Tomasz Figa wrote:
> > > >
> > > > On Wed, Oct 7, 2020 at 2:44 PM Jason
On Wed, Oct 07, 2020 at 03:34:01PM +0200, Tomasz Figa wrote:
> I think the userptr zero-copy hack should be able to go away indeed,
> given that we now have CMA that allows having carveouts backed by
> struct pages and having the memory represented as DMA-buf normally.
This also needs to figure
On Wed, Oct 7, 2020 at 3:06 PM Jason Gunthorpe wrote:
>
> On Wed, Oct 07, 2020 at 02:58:33PM +0200, Daniel Vetter wrote:
> > On Wed, Oct 7, 2020 at 2:48 PM Tomasz Figa wrote:
> > >
> > > On Wed, Oct 7, 2020 at 2:44 PM Jason Gunthorpe wrote:
> > > >
> > > > On Wed, Oct 07, 2020 at 02:33:56PM
On Wed, Oct 07, 2020 at 03:06:17PM +0200, Tomasz Figa wrote:
> Note that vb2_vmalloc is only used for in-kernel CPU usage, e.g. the
> contents being copied by the driver between vb2 buffers and some
> hardware FIFO or other dedicated buffers. The memory does not go to
> any hardware DMA.
That is
On Sat, Oct 3, 2020 at 1:31 AM Jason Gunthorpe wrote:
>
> On Fri, Oct 02, 2020 at 08:16:48PM +0200, Daniel Vetter wrote:
> > On Fri, Oct 2, 2020 at 8:06 PM Jason Gunthorpe wrote:
> > > On Fri, Oct 02, 2020 at 07:53:03PM +0200, Daniel Vetter wrote:
> > > > For $reasons I've stumbled over this
On Wed, Oct 07, 2020 at 02:58:33PM +0200, Daniel Vetter wrote:
> On Wed, Oct 7, 2020 at 2:48 PM Tomasz Figa wrote:
> >
> > On Wed, Oct 7, 2020 at 2:44 PM Jason Gunthorpe wrote:
> > >
> > > On Wed, Oct 07, 2020 at 02:33:56PM +0200, Marek Szyprowski wrote:
> > > > Well, it was in vb2_get_vma()
On Wed, Oct 7, 2020 at 2:48 PM Tomasz Figa wrote:
>
> On Wed, Oct 7, 2020 at 2:44 PM Jason Gunthorpe wrote:
> >
> > On Wed, Oct 07, 2020 at 02:33:56PM +0200, Marek Szyprowski wrote:
> > > Well, it was in vb2_get_vma() function, but now I see that it has been
> > > lost in fb639eb39154 and
On Wed, Oct 7, 2020 at 2:44 PM Jason Gunthorpe wrote:
>
> On Wed, Oct 07, 2020 at 02:33:56PM +0200, Marek Szyprowski wrote:
> > Well, it was in vb2_get_vma() function, but now I see that it has been
> > lost in fb639eb39154 and 6690c8c78c74 some time ago...
>
> There is no guarentee that holding
On Wed, Oct 07, 2020 at 02:33:56PM +0200, Marek Szyprowski wrote:
> Well, it was in vb2_get_vma() function, but now I see that it has been
> lost in fb639eb39154 and 6690c8c78c74 some time ago...
There is no guarentee that holding a get on the file says anthing
about the VMA. This needed to
Hi Daniel,
On 07.10.2020 14:01, Daniel Vetter wrote:
> On Wed, Oct 7, 2020 at 12:47 PM Marek Szyprowski
> wrote:
>> On 03.10.2020 11:40, Daniel Vetter wrote:
After he three places above should use pin_user_pages_fast(), then
this whole broken API should be moved into videobuf2-memops.c
On Wed, Oct 7, 2020 at 12:47 PM Marek Szyprowski
wrote:
>
> Hi Daniel,
>
> On 03.10.2020 11:40, Daniel Vetter wrote:
> >> After he three places above should use pin_user_pages_fast(), then
> >> this whole broken API should be moved into videobuf2-memops.c and a
> >> big fat "THIS DOESN'T WORK"
Hi Daniel,
On 03.10.2020 11:40, Daniel Vetter wrote:
>> After he three places above should use pin_user_pages_fast(), then
>> this whole broken API should be moved into videobuf2-memops.c and a
>> big fat "THIS DOESN'T WORK" stuck on it.
>>
>> videobuf2 should probably use P2P DMA buf for this
On Tue, Oct 6, 2020 at 2:26 PM Jason Gunthorpe wrote:
>
> On Tue, Oct 06, 2020 at 08:23:23AM +0200, Daniel Vetter wrote:
> > On Tue, Oct 6, 2020 at 1:41 AM Jason Gunthorpe wrote:
> > >
> > > On Tue, Oct 06, 2020 at 12:43:31AM +0200, Daniel Vetter wrote:
> > >
> > > > > iow I think I can outright
On Tue, Oct 06, 2020 at 08:23:23AM +0200, Daniel Vetter wrote:
> On Tue, Oct 6, 2020 at 1:41 AM Jason Gunthorpe wrote:
> >
> > On Tue, Oct 06, 2020 at 12:43:31AM +0200, Daniel Vetter wrote:
> >
> > > > iow I think I can outright delete the frame vector stuff.
> > >
> > > Ok this doesn't work,
On Mon, Oct 05, 2020 at 08:36:00PM -0700, Andrew Morton wrote:
> On Mon, 5 Oct 2020 14:47:47 -0300 Jason Gunthorpe wrote:
>
> > Andrew please let me know if you need a resend
>
> Andrew is rather confused.
>
> Can we please identify the minimal patch(es) which are needed for 5.9
> and -stable?
On Mon, Oct 5, 2020 at 7:58 PM Jason Gunthorpe wrote:
>
> On Mon, Oct 05, 2020 at 07:53:08PM +0200, Jan Kara wrote:
> > On Mon 05-10-20 14:38:54, Jason Gunthorpe wrote:
> > > When get_vaddr_frames() does its hacky follow_pfn() loop it should never
> > > be allowed to extract a struct page from a
On Tue, Oct 6, 2020 at 1:41 AM Jason Gunthorpe wrote:
>
> On Tue, Oct 06, 2020 at 12:43:31AM +0200, Daniel Vetter wrote:
>
> > > iow I think I can outright delete the frame vector stuff.
> >
> > Ok this doesn't work, because dma_mmap always uses a remap_pfn_range,
> > which is a VM_IO | VM_PFNMAP
On Mon, 5 Oct 2020 14:47:47 -0300 Jason Gunthorpe wrote:
> Andrew please let me know if you need a resend
Andrew is rather confused.
Can we please identify the minimal patch(es) which are needed for 5.9
and -stable?
On Tue, Oct 06, 2020 at 12:43:31AM +0200, Daniel Vetter wrote:
> > iow I think I can outright delete the frame vector stuff.
>
> Ok this doesn't work, because dma_mmap always uses a remap_pfn_range,
> which is a VM_IO | VM_PFNMAP vma and so even if it's cma backed and
> not a carveout, we can't
On Mon, Oct 5, 2020 at 8:54 PM Daniel Vetter wrote:
>
> On Mon, Oct 5, 2020 at 8:37 PM Jason Gunthorpe wrote:
> >
> > On Mon, Oct 05, 2020 at 08:16:33PM +0200, Daniel Vetter wrote:
> >
> > > > kvm is some similar hack added for P2P DMA, see commit
> > > >
On Mon, Oct 5, 2020 at 8:37 PM Jason Gunthorpe wrote:
>
> On Mon, Oct 05, 2020 at 08:16:33PM +0200, Daniel Vetter wrote:
>
> > > kvm is some similar hack added for P2P DMA, see commit
> > > add6a0cd1c5ba51b201e1361b05a5df817083618. It might be protected by
> > > notifiers..
> >
> > Yeah my
On Mon, Oct 05, 2020 at 08:16:33PM +0200, Daniel Vetter wrote:
> > kvm is some similar hack added for P2P DMA, see commit
> > add6a0cd1c5ba51b201e1361b05a5df817083618. It might be protected by
> > notifiers..
>
> Yeah my thinking is that kvm (and I think also vfio, also seems to
> have mmu
On Mon, Oct 5, 2020 at 7:58 PM Jason Gunthorpe wrote:
>
> On Mon, Oct 05, 2020 at 07:53:08PM +0200, Jan Kara wrote:
> > On Mon 05-10-20 14:38:54, Jason Gunthorpe wrote:
> > > When get_vaddr_frames() does its hacky follow_pfn() loop it should never
> > > be allowed to extract a struct page from a
On Mon, Oct 5, 2020 at 7:28 PM Jason Gunthorpe wrote:
>
> On Sun, Oct 04, 2020 at 06:09:29PM +0200, Daniel Vetter wrote:
> > On Sun, Oct 4, 2020 at 2:51 PM Jason Gunthorpe wrote:
> > >
> > > On Sat, Oct 03, 2020 at 11:40:22AM +0200, Daniel Vetter wrote:
> > >
> > > > > That leaves the only
On Mon, Oct 05, 2020 at 07:53:08PM +0200, Jan Kara wrote:
> On Mon 05-10-20 14:38:54, Jason Gunthorpe wrote:
> > When get_vaddr_frames() does its hacky follow_pfn() loop it should never
> > be allowed to extract a struct page from a normal VMA. This could allow a
> > serious use-after-free problem
On Mon, Oct 05, 2020 at 02:38:54PM -0300, Jason Gunthorpe wrote:
> When get_vaddr_frames() does its hacky follow_pfn() loop it should never
> be allowed to extract a struct page from a normal VMA. This could allow a
> serious use-after-free problem on any kernel memory.
>
> Restrict this to only
On Mon 05-10-20 14:38:54, Jason Gunthorpe wrote:
> When get_vaddr_frames() does its hacky follow_pfn() loop it should never
> be allowed to extract a struct page from a normal VMA. This could allow a
> serious use-after-free problem on any kernel memory.
>
> Restrict this to only work on VMA's
When get_vaddr_frames() does its hacky follow_pfn() loop it should never
be allowed to extract a struct page from a normal VMA. This could allow a
serious use-after-free problem on any kernel memory.
Restrict this to only work on VMA's with one of VM_IO | VM_PFNMAP
set. This limits the
On Sun, Oct 04, 2020 at 01:20:31PM +0200, Daniel Vetter wrote:
> Yeah I think that works. I tried understanding gup.c code a bit more,
> and it looks like FOLL_LONGTERM only works for the pup_fast variant
> right now? All others seem to have this comment that it's somehow
> incompatible with
On Sun, Oct 04, 2020 at 06:09:29PM +0200, Daniel Vetter wrote:
> On Sun, Oct 4, 2020 at 2:51 PM Jason Gunthorpe wrote:
> >
> > On Sat, Oct 03, 2020 at 11:40:22AM +0200, Daniel Vetter wrote:
> >
> > > > That leaves the only interesting places as vb2_dc_get_userptr() and
> > > >
Hi!
On Fri 02-10-20 15:06:03, Jason Gunthorpe wrote:
> This get_vaddr_frames() thing looks impossible to use properly. How on
> earth does a driver guarentee
>
> "If @start belongs to VM_IO | VM_PFNMAP vma, we don't touch page
> structures and the caller must make sure pfns aren't reused for
>
On Sun, Oct 4, 2020 at 2:51 PM Jason Gunthorpe wrote:
>
> On Sat, Oct 03, 2020 at 11:40:22AM +0200, Daniel Vetter wrote:
>
> > > That leaves the only interesting places as vb2_dc_get_userptr() and
> > > vb2_vmalloc_get_userptr() which both completely fail to follow the
> > > REQUIRED behavior in
On Sat, Oct 03, 2020 at 11:40:22AM +0200, Daniel Vetter wrote:
> > That leaves the only interesting places as vb2_dc_get_userptr() and
> > vb2_vmalloc_get_userptr() which both completely fail to follow the
> > REQUIRED behavior in the function's comment about checking PTEs. It
> > just DMA maps
On Sun, Oct 4, 2020 at 1:24 AM Jason Gunthorpe wrote:
> On Sat, Oct 03, 2020 at 03:52:32PM -0700, John Hubbard wrote:
> > On 10/3/20 2:45 AM, Daniel Vetter wrote:
> > > On Sat, Oct 3, 2020 at 12:39 AM John Hubbard wrote:
> > > >
> > > > On 10/2/20 10:53 AM, Daniel Vetter wrote:
> > > > > For
On Sat, Oct 03, 2020 at 03:52:32PM -0700, John Hubbard wrote:
> On 10/3/20 2:45 AM, Daniel Vetter wrote:
> > On Sat, Oct 3, 2020 at 12:39 AM John Hubbard wrote:
> > >
> > > On 10/2/20 10:53 AM, Daniel Vetter wrote:
> > > > For $reasons I've stumbled over this code and I'm not sure the change
> >
On 10/3/20 2:45 AM, Daniel Vetter wrote:
On Sat, Oct 3, 2020 at 12:39 AM John Hubbard wrote:
On 10/2/20 10:53 AM, Daniel Vetter wrote:
For $reasons I've stumbled over this code and I'm not sure the change
to the new gup functions in 55a650c35fea ("mm/gup: frame_vector:
convert
On Sat, Oct 3, 2020 at 12:39 AM John Hubbard wrote:
>
> On 10/2/20 10:53 AM, Daniel Vetter wrote:
> > For $reasons I've stumbled over this code and I'm not sure the change
> > to the new gup functions in 55a650c35fea ("mm/gup: frame_vector:
> > convert get_user_pages() --> pin_user_pages()") was
On Sat, Oct 3, 2020 at 1:31 AM Jason Gunthorpe wrote:
>
> On Fri, Oct 02, 2020 at 08:16:48PM +0200, Daniel Vetter wrote:
> > On Fri, Oct 2, 2020 at 8:06 PM Jason Gunthorpe wrote:
> > > On Fri, Oct 02, 2020 at 07:53:03PM +0200, Daniel Vetter wrote:
> > > > For $reasons I've stumbled over this
On Sat, Oct 3, 2020 at 2:31 AM Jason Gunthorpe wrote:
>
> On Fri, Oct 02, 2020 at 08:16:48PM +0200, Daniel Vetter wrote:
> > On Fri, Oct 2, 2020 at 8:06 PM Jason Gunthorpe wrote:
> > > On Fri, Oct 02, 2020 at 07:53:03PM +0200, Daniel Vetter wrote:
> > > > For $reasons I've stumbled over this
On Fri, Oct 02, 2020 at 08:16:48PM +0200, Daniel Vetter wrote:
> On Fri, Oct 2, 2020 at 8:06 PM Jason Gunthorpe wrote:
> > On Fri, Oct 02, 2020 at 07:53:03PM +0200, Daniel Vetter wrote:
> > > For $reasons I've stumbled over this code and I'm not sure the change
> > > to the new gup functions in
On 10/2/20 10:53 AM, Daniel Vetter wrote:
For $reasons I've stumbled over this code and I'm not sure the change
to the new gup functions in 55a650c35fea ("mm/gup: frame_vector:
convert get_user_pages() --> pin_user_pages()") was entirely correct.
This here is used for long term buffers (not
On Fri, Oct 2, 2020 at 8:06 PM Jason Gunthorpe wrote:
> On Fri, Oct 02, 2020 at 07:53:03PM +0200, Daniel Vetter wrote:
> > For $reasons I've stumbled over this code and I'm not sure the change
> > to the new gup functions in 55a650c35fea ("mm/gup: frame_vector:
> > convert get_user_pages() -->
On Fri, Oct 02, 2020 at 07:53:03PM +0200, Daniel Vetter wrote:
> For $reasons I've stumbled over this code and I'm not sure the change
> to the new gup functions in 55a650c35fea ("mm/gup: frame_vector:
> convert get_user_pages() --> pin_user_pages()") was entirely correct.
>
> This here is used
For $reasons I've stumbled over this code and I'm not sure the change
to the new gup functions in 55a650c35fea ("mm/gup: frame_vector:
convert get_user_pages() --> pin_user_pages()") was entirely correct.
This here is used for long term buffers (not just quick I/O) like
RDMA, and John notes this
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