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From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: John Hubbard <jhubbard@nvidia.com>
Cc: "DRI Development" <dri-devel@lists.freedesktop.org>,
	LKML <linux-kernel@vger.kernel.org>,
	kvm@vger.kernel.org, "Linux MM" <linux-mm@kvack.org>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
	"open list:DMA BUFFER SHARING FRAMEWORK"
	<linux-media@vger.kernel.org>,
	linux-s390@vger.kernel.org, "Jason Gunthorpe" <jgg@ziepe.ca>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Kees Cook" <keescook@chromium.org>,
	"Rik van Riel" <riel@redhat.com>,
	"Benjamin Herrensmidt" <benh@kernel.crashing.org>,
	"Dave Airlie" <airlied@linux.ie>,
	"Hugh Dickins" <hugh@veritas.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Jérôme Glisse" <jglisse@redhat.com>, "Jan Kara" <jack@suse.cz>,
	"Daniel Vetter" <daniel.vetter@intel.com>
Subject: Re: [PATCH 07/13] mm: close race in generic_access_phys
Date: Thu, 8 Oct 2020 09:23:14 +0200	[thread overview]
Message-ID: <CAKMK7uEa1+f+34qeLo9F3-SvYpOKtGmQ+8sDtbEBmFeXkCx9mw@mail.gmail.com> (raw)
In-Reply-To: <852a74ec-339b-4c7f-9e29-b9736111849a@nvidia.com>

On Thu, Oct 8, 2020 at 2:44 AM John Hubbard <jhubbard@nvidia.com> wrote:
>
> On 10/7/20 9:44 AM, Daniel Vetter wrote:
> > Way back it was a reasonable assumptions that iomem mappings never
> > change the pfn range they point at. But this has changed:
> >
> > - gpu drivers dynamically manage their memory nowadays, invalidating
> >    ptes with unmap_mapping_range when buffers get moved
> >
> > - contiguous dma allocations have moved from dedicated carvetouts to
>
> s/carvetouts/carveouts/
>
> >    cma regions. This means if we miss the unmap the pfn might contain
> >    pagecache or anon memory (well anything allocated with GFP_MOVEABLE)
> >
> > - even /dev/mem now invalidates mappings when the kernel requests that
> >    iomem region when CONFIG_IO_STRICT_DEVMEM is set, see 3234ac664a87
> >    ("/dev/mem: Revoke mappings when a driver claims the region")
>
> Thanks for putting these references into the log, it's very helpful.
> ...
> > diff --git a/mm/memory.c b/mm/memory.c
> > index fcfc4ca36eba..8d467e23b44e 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -4873,28 +4873,68 @@ int follow_phys(struct vm_area_struct *vma,
> >       return ret;
> >   }
> >
> > +/**
> > + * generic_access_phys - generic implementation for iomem mmap access
> > + * @vma: the vma to access
> > + * @addr: userspace addres, not relative offset within @vma
> > + * @buf: buffer to read/write
> > + * @len: length of transfer
> > + * @write: set to FOLL_WRITE when writing, otherwise reading
> > + *
> > + * This is a generic implementation for &vm_operations_struct.access for an
> > + * iomem mapping. This callback is used by access_process_vm() when the @vma is
> > + * not page based.
> > + */
> >   int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
> >                       void *buf, int len, int write)
> >   {
> >       resource_size_t phys_addr;
> >       unsigned long prot = 0;
> >       void __iomem *maddr;
> > +     pte_t *ptep, pte;
> > +     spinlock_t *ptl;
> >       int offset = addr & (PAGE_SIZE-1);
> > +     int ret = -EINVAL;
> > +
> > +     if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
> > +             return -EINVAL;
> > +
> > +retry:
> > +     if (follow_pte(vma->vm_mm, addr, &ptep, &ptl))
> > +             return -EINVAL;
> > +     pte = *ptep;
> > +     pte_unmap_unlock(ptep, ptl);
> >
> > -     if (follow_phys(vma, addr, write, &prot, &phys_addr))
> > +     prot = pgprot_val(pte_pgprot(pte));
> > +     phys_addr = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
> > +
> > +     if ((write & FOLL_WRITE) && !pte_write(pte))
> >               return -EINVAL;
> >
> >       maddr = ioremap_prot(phys_addr, PAGE_ALIGN(len + offset), prot);
> >       if (!maddr)
> >               return -ENOMEM;
> >
> > +     if (follow_pte(vma->vm_mm, addr, &ptep, &ptl))
> > +             goto out_unmap;
> > +
> > +     if (pte_same(pte, *ptep)) {
>
>
> The ioremap area is something I'm sorta new to, so a newbie question:
> is it possible for the same pte to already be there, ever? If so, we
> be stuck in an infinite loop here.  I'm sure that's not the case, but
> it's not yet obvious to me why it's impossible. Resource reservations
> maybe?

It's just buggy, it should be !pte_same. And I need to figure out how
to test this I guess.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

WARNING: multiple messages have this Message-ID
From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: John Hubbard <jhubbard@nvidia.com>
Cc: linux-s390@vger.kernel.org, "Rik van Riel" <riel@redhat.com>,
	linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
	"Jan Kara" <jack@suse.cz>, "Kees Cook" <keescook@chromium.org>,
	kvm@vger.kernel.org, "Jason Gunthorpe" <jgg@ziepe.ca>,
	"Dave Airlie" <airlied@linux.ie>,
	"Benjamin Herrensmidt" <benh@kernel.crashing.org>,
	LKML <linux-kernel@vger.kernel.org>,
	"DRI Development" <dri-devel@lists.freedesktop.org>,
	"Linux MM" <linux-mm@kvack.org>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Daniel Vetter" <daniel.vetter@intel.com>,
	"Hugh Dickins" <hugh@veritas.com>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	"open list:DMA BUFFER SHARING FRAMEWORK"
	<linux-media@vger.kernel.org>
Subject: Re: [PATCH 07/13] mm: close race in generic_access_phys
Date: Thu, 8 Oct 2020 09:23:14 +0200	[thread overview]
Message-ID: <CAKMK7uEa1+f+34qeLo9F3-SvYpOKtGmQ+8sDtbEBmFeXkCx9mw@mail.gmail.com> (raw)
In-Reply-To: <852a74ec-339b-4c7f-9e29-b9736111849a@nvidia.com>

On Thu, Oct 8, 2020 at 2:44 AM John Hubbard <jhubbard@nvidia.com> wrote:
>
> On 10/7/20 9:44 AM, Daniel Vetter wrote:
> > Way back it was a reasonable assumptions that iomem mappings never
> > change the pfn range they point at. But this has changed:
> >
> > - gpu drivers dynamically manage their memory nowadays, invalidating
> >    ptes with unmap_mapping_range when buffers get moved
> >
> > - contiguous dma allocations have moved from dedicated carvetouts to
>
> s/carvetouts/carveouts/
>
> >    cma regions. This means if we miss the unmap the pfn might contain
> >    pagecache or anon memory (well anything allocated with GFP_MOVEABLE)
> >
> > - even /dev/mem now invalidates mappings when the kernel requests that
> >    iomem region when CONFIG_IO_STRICT_DEVMEM is set, see 3234ac664a87
> >    ("/dev/mem: Revoke mappings when a driver claims the region")
>
> Thanks for putting these references into the log, it's very helpful.
> ...
> > diff --git a/mm/memory.c b/mm/memory.c
> > index fcfc4ca36eba..8d467e23b44e 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -4873,28 +4873,68 @@ int follow_phys(struct vm_area_struct *vma,
> >       return ret;
> >   }
> >
> > +/**
> > + * generic_access_phys - generic implementation for iomem mmap access
> > + * @vma: the vma to access
> > + * @addr: userspace addres, not relative offset within @vma
> > + * @buf: buffer to read/write
> > + * @len: length of transfer
> > + * @write: set to FOLL_WRITE when writing, otherwise reading
> > + *
> > + * This is a generic implementation for &vm_operations_struct.access for an
> > + * iomem mapping. This callback is used by access_process_vm() when the @vma is
> > + * not page based.
> > + */
> >   int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
> >                       void *buf, int len, int write)
> >   {
> >       resource_size_t phys_addr;
> >       unsigned long prot = 0;
> >       void __iomem *maddr;
> > +     pte_t *ptep, pte;
> > +     spinlock_t *ptl;
> >       int offset = addr & (PAGE_SIZE-1);
> > +     int ret = -EINVAL;
> > +
> > +     if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
> > +             return -EINVAL;
> > +
> > +retry:
> > +     if (follow_pte(vma->vm_mm, addr, &ptep, &ptl))
> > +             return -EINVAL;
> > +     pte = *ptep;
> > +     pte_unmap_unlock(ptep, ptl);
> >
> > -     if (follow_phys(vma, addr, write, &prot, &phys_addr))
> > +     prot = pgprot_val(pte_pgprot(pte));
> > +     phys_addr = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
> > +
> > +     if ((write & FOLL_WRITE) && !pte_write(pte))
> >               return -EINVAL;
> >
> >       maddr = ioremap_prot(phys_addr, PAGE_ALIGN(len + offset), prot);
> >       if (!maddr)
> >               return -ENOMEM;
> >
> > +     if (follow_pte(vma->vm_mm, addr, &ptep, &ptl))
> > +             goto out_unmap;
> > +
> > +     if (pte_same(pte, *ptep)) {
>
>
> The ioremap area is something I'm sorta new to, so a newbie question:
> is it possible for the same pte to already be there, ever? If so, we
> be stuck in an infinite loop here.  I'm sure that's not the case, but
> it's not yet obvious to me why it's impossible. Resource reservations
> maybe?

It's just buggy, it should be !pte_same. And I need to figure out how
to test this I guess.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

WARNING: multiple messages have this Message-ID
From: Daniel Vetter <daniel.vetter@ffwll.ch>
To: John Hubbard <jhubbard@nvidia.com>
Cc: linux-s390@vger.kernel.org, "Rik van Riel" <riel@redhat.com>,
	linux-samsung-soc <linux-samsung-soc@vger.kernel.org>,
	"Jan Kara" <jack@suse.cz>, "Kees Cook" <keescook@chromium.org>,
	kvm@vger.kernel.org, "Jason Gunthorpe" <jgg@ziepe.ca>,
	"Dave Airlie" <airlied@linux.ie>,
	LKML <linux-kernel@vger.kernel.org>,
	"DRI Development" <dri-devel@lists.freedesktop.org>,
	"Linux MM" <linux-mm@kvack.org>,
	"Jérôme Glisse" <jglisse@redhat.com>,
	"Daniel Vetter" <daniel.vetter@intel.com>,
	"Hugh Dickins" <hugh@veritas.com>,
	"Dan Williams" <dan.j.williams@intel.com>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Linux ARM" <linux-arm-kernel@lists.infradead.org>,
	"open list:DMA BUFFER SHARING FRAMEWORK"
	<linux-media@vger.kernel.org>
Subject: Re: [PATCH 07/13] mm: close race in generic_access_phys
Date: Thu, 8 Oct 2020 09:23:14 +0200	[thread overview]
Message-ID: <CAKMK7uEa1+f+34qeLo9F3-SvYpOKtGmQ+8sDtbEBmFeXkCx9mw@mail.gmail.com> (raw)
In-Reply-To: <852a74ec-339b-4c7f-9e29-b9736111849a@nvidia.com>

On Thu, Oct 8, 2020 at 2:44 AM John Hubbard <jhubbard@nvidia.com> wrote:
>
> On 10/7/20 9:44 AM, Daniel Vetter wrote:
> > Way back it was a reasonable assumptions that iomem mappings never
> > change the pfn range they point at. But this has changed:
> >
> > - gpu drivers dynamically manage their memory nowadays, invalidating
> >    ptes with unmap_mapping_range when buffers get moved
> >
> > - contiguous dma allocations have moved from dedicated carvetouts to
>
> s/carvetouts/carveouts/
>
> >    cma regions. This means if we miss the unmap the pfn might contain
> >    pagecache or anon memory (well anything allocated with GFP_MOVEABLE)
> >
> > - even /dev/mem now invalidates mappings when the kernel requests that
> >    iomem region when CONFIG_IO_STRICT_DEVMEM is set, see 3234ac664a87
> >    ("/dev/mem: Revoke mappings when a driver claims the region")
>
> Thanks for putting these references into the log, it's very helpful.
> ...
> > diff --git a/mm/memory.c b/mm/memory.c
> > index fcfc4ca36eba..8d467e23b44e 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -4873,28 +4873,68 @@ int follow_phys(struct vm_area_struct *vma,
> >       return ret;
> >   }
> >
> > +/**
> > + * generic_access_phys - generic implementation for iomem mmap access
> > + * @vma: the vma to access
> > + * @addr: userspace addres, not relative offset within @vma
> > + * @buf: buffer to read/write
> > + * @len: length of transfer
> > + * @write: set to FOLL_WRITE when writing, otherwise reading
> > + *
> > + * This is a generic implementation for &vm_operations_struct.access for an
> > + * iomem mapping. This callback is used by access_process_vm() when the @vma is
> > + * not page based.
> > + */
> >   int generic_access_phys(struct vm_area_struct *vma, unsigned long addr,
> >                       void *buf, int len, int write)
> >   {
> >       resource_size_t phys_addr;
> >       unsigned long prot = 0;
> >       void __iomem *maddr;
> > +     pte_t *ptep, pte;
> > +     spinlock_t *ptl;
> >       int offset = addr & (PAGE_SIZE-1);
> > +     int ret = -EINVAL;
> > +
> > +     if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
> > +             return -EINVAL;
> > +
> > +retry:
> > +     if (follow_pte(vma->vm_mm, addr, &ptep, &ptl))
> > +             return -EINVAL;
> > +     pte = *ptep;
> > +     pte_unmap_unlock(ptep, ptl);
> >
> > -     if (follow_phys(vma, addr, write, &prot, &phys_addr))
> > +     prot = pgprot_val(pte_pgprot(pte));
> > +     phys_addr = (resource_size_t)pte_pfn(pte) << PAGE_SHIFT;
> > +
> > +     if ((write & FOLL_WRITE) && !pte_write(pte))
> >               return -EINVAL;
> >
> >       maddr = ioremap_prot(phys_addr, PAGE_ALIGN(len + offset), prot);
> >       if (!maddr)
> >               return -ENOMEM;
> >
> > +     if (follow_pte(vma->vm_mm, addr, &ptep, &ptl))
> > +             goto out_unmap;
> > +
> > +     if (pte_same(pte, *ptep)) {
>
>
> The ioremap area is something I'm sorta new to, so a newbie question:
> is it possible for the same pte to already be there, ever? If so, we
> be stuck in an infinite loop here.  I'm sure that's not the case, but
> it's not yet obvious to me why it's impossible. Resource reservations
> maybe?

It's just buggy, it should be !pte_same. And I need to figure out how
to test this I guess.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  reply	other threads:[~2020-10-08  7:23 UTC|newest]

Thread overview: 166+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-07 16:44 [PATCH 00/13] follow_pfn and other iomap races Daniel Vetter
2020-10-07 16:44 ` Daniel Vetter
2020-10-07 16:44 ` Daniel Vetter
2020-10-07 16:44 ` [PATCH 01/13] drm/exynos: Stop using frame_vector helpers Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 20:32   ` John Hubbard
2020-10-07 20:32     ` John Hubbard
2020-10-07 20:32     ` John Hubbard
2020-10-07 21:32     ` Daniel Vetter
2020-10-07 21:32       ` Daniel Vetter
2020-10-07 21:32       ` Daniel Vetter
2020-10-07 21:36       ` John Hubbard
2020-10-07 21:36         ` John Hubbard
2020-10-07 21:36         ` John Hubbard
2020-10-07 21:50         ` Daniel Vetter
2020-10-07 21:50           ` Daniel Vetter
2020-10-07 21:50           ` Daniel Vetter
2020-10-07 16:44 ` [PATCH 02/13] drm/exynos: Use FOLL_LONGTERM for g2d cmdlists Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 20:43   ` John Hubbard
2020-10-07 20:43     ` John Hubbard
2020-10-07 20:43     ` John Hubbard
2020-10-07 16:44 ` [PATCH 03/13] misc/habana: Stop using frame_vector helpers Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 20:38   ` John Hubbard
2020-10-07 20:38     ` John Hubbard
2020-10-07 20:38     ` John Hubbard
2020-10-07 16:44 ` [PATCH 04/13] misc/habana: Use FOLL_LONGTERM for userptr Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 20:46   ` John Hubbard
2020-10-07 20:46     ` John Hubbard
2020-10-07 20:46     ` John Hubbard
2020-10-07 16:44 ` [PATCH 05/13] mm/frame-vector: Use FOLL_LONGTERM Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:53   ` Jason Gunthorpe
2020-10-07 16:53     ` Jason Gunthorpe
2020-10-07 16:53     ` Jason Gunthorpe
2020-10-07 17:12     ` Daniel Vetter
2020-10-07 17:12       ` Daniel Vetter
2020-10-07 17:12       ` Daniel Vetter
2020-10-07 17:33       ` Jason Gunthorpe
2020-10-07 17:33         ` Jason Gunthorpe
2020-10-07 17:33         ` Jason Gunthorpe
2020-10-07 21:13   ` John Hubbard
2020-10-07 21:13     ` John Hubbard
2020-10-07 21:13     ` John Hubbard
2020-10-07 21:30     ` Daniel Vetter
2020-10-07 21:30       ` Daniel Vetter
2020-10-07 21:30       ` Daniel Vetter
2020-10-07 16:44 ` [PATCH 06/13] media: videobuf2: Move frame_vector into media subsystem Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 22:18   ` John Hubbard
2020-10-07 22:18     ` John Hubbard
2020-10-07 22:18     ` John Hubbard
2020-10-07 16:44 ` [PATCH 07/13] mm: close race in generic_access_phys Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 17:27   ` Jason Gunthorpe
2020-10-07 17:27     ` Jason Gunthorpe
2020-10-07 17:27     ` Jason Gunthorpe
2020-10-07 18:01     ` Daniel Vetter
2020-10-07 18:01       ` Daniel Vetter
2020-10-07 18:01       ` Daniel Vetter
2020-10-07 23:21       ` Jason Gunthorpe
2020-10-07 23:21         ` Jason Gunthorpe
2020-10-07 23:21         ` Jason Gunthorpe
2020-10-08  0:44   ` John Hubbard
2020-10-08  0:44     ` John Hubbard
2020-10-08  0:44     ` John Hubbard
2020-10-08  7:23     ` Daniel Vetter [this message]
2020-10-08  7:23       ` Daniel Vetter
2020-10-08  7:23       ` Daniel Vetter
2020-10-07 16:44 ` [PATCH 08/13] s390/pci: Remove races against pte updates Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-08 16:44   ` Gerald Schaefer
2020-10-08 16:44     ` Gerald Schaefer
2020-10-08 16:44     ` Gerald Schaefer
2020-10-08 17:16     ` Daniel Vetter
2020-10-08 17:16       ` Daniel Vetter
2020-10-08 17:16       ` Daniel Vetter
2020-10-07 16:44 ` [PATCH 09/13] PCI: obey iomem restrictions for procfs mmap Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 18:46   ` Bjorn Helgaas
2020-10-07 18:46     ` Bjorn Helgaas
2020-10-07 18:46     ` Bjorn Helgaas
2020-10-07 18:46     ` Bjorn Helgaas
2020-10-07 16:44 ` [PATCH 10/13] PCI: revoke mappings like devmem Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 18:41   ` Bjorn Helgaas
2020-10-07 18:41     ` Bjorn Helgaas
2020-10-07 18:41     ` Bjorn Helgaas
2020-10-07 19:24     ` Daniel Vetter
2020-10-07 19:24       ` Daniel Vetter
2020-10-07 19:24       ` Daniel Vetter
2020-10-07 19:33   ` Dan Williams
2020-10-07 19:33     ` Dan Williams
2020-10-07 19:33     ` Dan Williams
2020-10-07 19:47     ` Daniel Vetter
2020-10-07 19:47       ` Daniel Vetter
2020-10-07 19:47       ` Daniel Vetter
2020-10-07 22:23       ` Dan Williams
2020-10-07 22:23         ` Dan Williams
2020-10-07 22:23         ` Dan Williams
2020-10-07 22:29         ` Dan Williams
2020-10-07 22:29           ` Dan Williams
2020-10-07 22:29           ` Dan Williams
2020-10-08  8:09           ` Daniel Vetter
2020-10-08  8:09             ` Daniel Vetter
2020-10-08  8:09             ` Daniel Vetter
2020-10-07 23:24     ` Jason Gunthorpe
2020-10-07 23:24       ` Jason Gunthorpe
2020-10-07 23:24       ` Jason Gunthorpe
2020-10-08  7:31       ` Daniel Vetter
2020-10-08  7:31         ` Daniel Vetter
2020-10-08  7:31         ` Daniel Vetter
2020-10-08  7:49       ` Dan Williams
2020-10-08  7:49         ` Dan Williams
2020-10-08  7:49         ` Dan Williams
2020-10-08  8:13         ` Daniel Vetter
2020-10-08  8:13           ` Daniel Vetter
2020-10-08  8:13           ` Daniel Vetter
2020-10-08  8:35           ` Dan Williams
2020-10-08  8:35             ` Dan Williams
2020-10-08  8:35             ` Dan Williams
2020-10-08 12:41         ` Jason Gunthorpe
2020-10-08 12:41           ` Jason Gunthorpe
2020-10-08 12:41           ` Jason Gunthorpe
2020-10-07 16:44 ` [PATCH 11/13] mm: add unsafe_follow_pfn Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 17:36   ` Jason Gunthorpe
2020-10-07 17:36     ` Jason Gunthorpe
2020-10-07 17:36     ` Jason Gunthorpe
2020-10-07 18:10     ` Daniel Vetter
2020-10-07 18:10       ` Daniel Vetter
2020-10-07 18:10       ` Daniel Vetter
2020-10-07 19:00       ` Jason Gunthorpe
2020-10-07 19:00         ` Jason Gunthorpe
2020-10-07 19:00         ` Jason Gunthorpe
2020-10-07 19:38         ` Daniel Vetter
2020-10-07 19:38           ` Daniel Vetter
2020-10-07 19:38           ` Daniel Vetter
2020-10-07 16:44 ` [PATCH 12/13] media/videbuf1|2: Mark follow_pfn usage as unsafe Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44 ` [PATCH 13/13] vfio/type1: Mark follow_pfn " Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 16:44   ` Daniel Vetter
2020-10-07 17:39   ` Jason Gunthorpe
2020-10-07 17:39     ` Jason Gunthorpe
2020-10-07 17:39     ` Jason Gunthorpe
2020-10-07 18:14     ` Daniel Vetter
2020-10-07 18:14       ` Daniel Vetter
2020-10-07 18:14       ` Daniel Vetter
2020-10-07 18:47       ` Jason Gunthorpe
2020-10-07 18:47         ` Jason Gunthorpe
2020-10-07 18:47         ` Jason Gunthorpe

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