On Thu, 15 Oct 2020 at 15:39, Mark Rutland wrote:
> On Wed, Oct 14, 2020 at 09:12:37PM +0200, Marco Elver wrote:
> > On Thu, 8 Oct 2020 at 12:45, Mark Rutland wrote:
> > > On Thu, Oct 08, 2020 at 11:40:52AM +0200, Marco Elver wrote:
> > > > On Thu, 1 Oct 2020 at 19:58, Mark Rutland wrote:
>
> >
On Wed, Oct 14, 2020 at 09:12:37PM +0200, Marco Elver wrote:
> On Thu, 8 Oct 2020 at 12:45, Mark Rutland wrote:
> > On Thu, Oct 08, 2020 at 11:40:52AM +0200, Marco Elver wrote:
> > > On Thu, 1 Oct 2020 at 19:58, Mark Rutland wrote:
> > > > > > If you need virt_to_page() to work, the address has
On Thu, 8 Oct 2020 at 12:45, Mark Rutland wrote:
> On Thu, Oct 08, 2020 at 11:40:52AM +0200, Marco Elver wrote:
> > On Thu, 1 Oct 2020 at 19:58, Mark Rutland wrote:
> > [...]
> > > > > If you need virt_to_page() to work, the address has to be part of the
> > > > > linear/direct map.
> > [...]
> >
On Thu, Oct 08, 2020 at 11:40:52AM +0200, Marco Elver wrote:
> On Thu, 1 Oct 2020 at 19:58, Mark Rutland wrote:
> [...]
> > > > If you need virt_to_page() to work, the address has to be part of the
> > > > linear/direct map.
> [...]
> >
> > What's the underlying requirement here? Is this a perform
On Thu, 1 Oct 2020 at 19:58, Mark Rutland wrote:
[...]
> > > If you need virt_to_page() to work, the address has to be part of the
> > > linear/direct map.
[...]
>
> What's the underlying requirement here? Is this a performance concern,
> codegen/codesize, or something else?
It used to be perform
On Thu, Oct 01, 2020 at 01:24:49PM +0200, Alexander Potapenko wrote:
> Mark,
>
> > If you need virt_to_page() to work, the address has to be part of the
> > linear/direct map.
> >
> > If you need to find the struct page for something that's part of the
> > kernel image you can use virt_to_page(lm_
Mark,
> If you need virt_to_page() to work, the address has to be part of the
> linear/direct map.
>
> If you need to find the struct page for something that's part of the
> kernel image you can use virt_to_page(lm_alias(x)).
>
> > Looks like filling page table entries (similarly to what's being d
On Tue, Sep 29, 2020 at 4:28 PM Mark Rutland wrote:
>
> On Mon, Sep 21, 2020 at 03:26:04PM +0200, Marco Elver wrote:
> > Add architecture specific implementation details for KFENCE and enable
> > KFENCE for the arm64 architecture. In particular, this implements the
> > required interface in . Curr
> > On x86 we just do `char __kfence_pool[KFENCE_POOL_SIZE] ...;` to
> > statically allocate the pool. On arm64 this doesn't seem to work
> > because static memory doesn't have struct pages?
>
> Are you using virt_to_page() directly on that statically-allocated
> __kfence_pool? If so you'll need to
On Mon, Sep 21, 2020 at 03:26:04PM +0200, Marco Elver wrote:
> Add architecture specific implementation details for KFENCE and enable
> KFENCE for the arm64 architecture. In particular, this implements the
> required interface in . Currently, the arm64 version does
> not yet use a statically alloca
On Fri, Sep 25, 2020 at 05:25:11PM +0200, Alexander Potapenko wrote:
> Will,
>
> > Given that the pool is relatively small (i.e. when compared with our virtual
> > address space), dedicating an area of virtual space sounds like it makes
> > the most sense here. How early do you need it to be avail
On Tue, Sep 22, 2020 at 11:56:26AM +0200, Marco Elver wrote:
> On Mon, 21 Sep 2020 at 19:44, Will Deacon wrote:
> [...]
> > > > > > For ARM64, we would like to solicit feedback on what the best
> > > > > > option is
> > > > > > to obtain a constant address for __kfence_pool. One option is to
> >
On Mon, 21 Sep 2020 at 16:31, Will Deacon wrote:
> On Mon, Sep 21, 2020 at 03:26:04PM +0200, Marco Elver wrote:
> > Add architecture specific implementation details for KFENCE and enable
> > KFENCE for the arm64 architecture. In particular, this implements the
> > required interface in . Currently
Will,
> Given that the pool is relatively small (i.e. when compared with our virtual
> address space), dedicating an area of virtual space sounds like it makes
> the most sense here. How early do you need it to be available?
How do we assign struct pages to a fixed virtual space area (I'm
current
On Mon, 21 Sep 2020 at 19:44, Will Deacon wrote:
[...]
> > > > > For ARM64, we would like to solicit feedback on what the best option
> > > > > is
> > > > > to obtain a constant address for __kfence_pool. One option is to
> > > > > declare
> > > > > a memory range in the memory layout to be dedi
On Mon, Sep 21, 2020 at 05:37:10PM +0200, Alexander Potapenko wrote:
> On Mon, Sep 21, 2020 at 4:58 PM Alexander Potapenko wrote:
> >
> > On Mon, Sep 21, 2020 at 4:31 PM Will Deacon wrote:
> > >
> > > On Mon, Sep 21, 2020 at 03:26:04PM +0200, Marco Elver wrote:
> > > > Add architecture specific i
On Mon, Sep 21, 2020 at 4:58 PM Alexander Potapenko wrote:
>
> On Mon, Sep 21, 2020 at 4:31 PM Will Deacon wrote:
> >
> > On Mon, Sep 21, 2020 at 03:26:04PM +0200, Marco Elver wrote:
> > > Add architecture specific implementation details for KFENCE and enable
> > > KFENCE for the arm64 architectu
On Mon, Sep 21, 2020 at 4:31 PM Will Deacon wrote:
>
> On Mon, Sep 21, 2020 at 03:26:04PM +0200, Marco Elver wrote:
> > Add architecture specific implementation details for KFENCE and enable
> > KFENCE for the arm64 architecture. In particular, this implements the
> > required interface in . Curre
On Mon, Sep 21, 2020 at 03:26:04PM +0200, Marco Elver wrote:
> Add architecture specific implementation details for KFENCE and enable
> KFENCE for the arm64 architecture. In particular, this implements the
> required interface in . Currently, the arm64 version does
> not yet use a statically alloca
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