Hi Cristoph,
On Tue, 2021-11-02 at 07:41 +0100, Christoph Hellwig wrote:
> As others pointed out, DMA_ATTR_NO_KERNEL_MAPPING just means the
> caller can't rely on a kernel mapping. So the "fix" here is
> wrong. That being said for cases where we can easily remove a page
> from the kernel
Hi Christoph,
I am sorry, fix my typo.
Walter
On Tue, 2021-11-02 at 07:41 +0100, Christoph Hellwig wrote:
> As others pointed out, DMA_ATTR_NO_KERNEL_MAPPING just means the
> caller can't rely on a kernel mapping. So the "fix" here is
> wrong. That being said for cases where we can easily
On Mon, 2021-11-01 at 15:17 +0100, Ard Biesheuvel wrote:
> On Mon, 1 Nov 2021 at 13:21, Walter Wu
> wrote:
> >
> > Hi Ard,
> >
> > On Mon, 2021-11-01 at 09:34 +0100, Ard Biesheuvel wrote:
> > > On Mon, 1 Nov 2021
support for ARM64.
Signed-off-by: Walter Wu
Suggested-by: Christoph Hellwig
Suggested-by: Ard Biesheuvel
Cc: Christoph Hellwig
Cc: Marek Szyprowski
Cc: Robin Murphy
Cc: Matthias Brugger
Cc: Ard Biesheuvel
Cc: Andrew Morton
---
v2:
1. modify commit message and fix the removing mapping
On Thu, 2021-11-04 at 09:53 +0100, Christoph Hellwig wrote:
> On Thu, Nov 04, 2021 at 10:32:21AM +0800, Walter Wu wrote:
> > diff --git a/include/linux/set_memory.h
> > b/include/linux/set_memory.h
> > index f36be5166c19..6c7d1683339c 100644
> > --- a/include/linux/set
On Thu, 2021-11-04 at 09:57 +0100, Ard Biesheuvel wrote:
> On Thu, 4 Nov 2021 at 09:53, Christoph Hellwig wrote:
> >
> > On Thu, Nov 04, 2021 at 10:32:21AM +0800, Walter Wu wrote:
> > > diff --git a/include/linux/set_memory.h
> > > b/include/linux/set_
On Thu, 2021-11-04 at 13:47 +0100, Ard Biesheuvel wrote:
> On Thu, 4 Nov 2021 at 13:31, Walter Wu
> wrote:
> >
> > On Thu, 2021-11-04 at 09:57 +0100, Ard Biesheuvel wrote:
> > > On Thu, 4 Nov 2021 at 09:53, Christoph Hellwig
> > > wrote:
> > > >
.
In some cases, we don't hope the allocated buffer to be read
by cpu or speculative execution, so we use DMA_ATTR_NO_KERNEL_MAPPING
to get no kernel mapping in order to achieve this goal.
Signed-off-by: Walter Wu
Cc: Christoph Hellwig
Cc: Marek Szyprowski
Cc: Robin Murphy
Cc: Matthias Brugger
Cc
Hi Robin,
On Mon, 2021-11-01 at 10:29 +, Robin Murphy wrote:
> On 2021-11-01 03:15, Walter Wu wrote:
> > DMA_ATTR_NO_KERNEL_MAPPING is to avoid creating a kernel mapping
> > for the allocated buffer, but current implementation is that
> > PTE of allocated buffer in kerne
Hi Ard,
On Mon, 2021-11-01 at 09:34 +0100, Ard Biesheuvel wrote:
> On Mon, 1 Nov 2021 at 04:17, Walter Wu
> wrote:
> >
> > DMA_ATTR_NO_KERNEL_MAPPING is to avoid creating a kernel mapping
> > for the allocated buffer, but current implementation is that
> > PTE of a
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