On Mon, 25 Jan 2021 at 15:28, Marc Zyngier wrote:
>
> On 2021-01-25 14:19, Ard Biesheuvel wrote:
> > On Mon, 25 Jan 2021 at 14:54, Marc Zyngier wrote:
> >>
> >> On 2021-01-25 12:54, Ard Biesheuvel wrote:
>
> [...]
>
> >> > This struct
On Mon, 25 Jan 2021 at 14:54, Marc Zyngier wrote:
>
> On 2021-01-25 12:54, Ard Biesheuvel wrote:
> > On Mon, 25 Jan 2021 at 11:53, Marc Zyngier wrote:
> >>
> >> Given that the early cpufeature infrastructure has borrowed quite
> >> a lot of code from the
On Mon, 25 Jan 2021 at 11:53, Marc Zyngier wrote:
>
> Given that the early cpufeature infrastructure has borrowed quite
> a lot of code from the kaslr implementation, let's reimplement
> the matching of the "nokaslr" option with it.
>
> Signed-off-by: Marc Zyngier
> Acked-by: Catalin Marinas
>
On Fri, 15 Jan 2021 at 15:03, Marc Zyngier wrote:
>
> It looks like we have broken firmware out there that wrongly advertises
> a GICv2 compatibility interface, despite the CPUs not being able to deal
> with it.
>
> To work around this, check that the CPU initialising KVM is actually able
> to
On Wed, 12 May 2021 at 09:34, Mike Rapoport wrote:
>
> On Wed, May 12, 2021 at 09:00:02AM +0200, Ard Biesheuvel wrote:
> > On Tue, 11 May 2021 at 12:05, Mike Rapoport wrote:
> > >
> > > From: Mike Rapoport
> > >
> > > Hi,
> > &g
On Tue, 11 May 2021 at 12:05, Mike Rapoport wrote:
>
> From: Mike Rapoport
>
> Hi,
>
> These patches aim to remove CONFIG_HOLES_IN_ZONE and essentially hardwire
> pfn_valid_within() to 1.
>
> The idea is to mark NOMAP pages as reserved in the memory map and restore
> the intended semantics of
; Split out initialization of the reserved pages to a function with a
> meaningful name and treat the MEMBLOCK_NOMAP regions the same way as the
> reserved regions and mark struct pages for the NOMAP regions as
> PageReserved.
>
> Signed-off-by: Mike Rapoport
> Reviewed-by: David H
;
> While here also update style of pfn_valid() so that both pfn_valid() and
> pfn_is_map_memory() declarations will be consistent.
>
> Signed-off-by: Mike Rapoport
> Acked-by: David Hildenbrand
Acked-by: Ard Biesheuvel
> ---
> arch/arm64/include/asm/memory.h | 2 +-
&
human Khandual
> Signed-off-by: Mike Rapoport
> Reviewed-by: Anshuman Khandual
Acked-by: Ard Biesheuvel
> ---
> include/linux/mmzone.h | 11 +++
> 1 file changed, 11 insertions(+)
>
> diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> index 0d53eba1c3
fn_valid() can be slightly simplified by replacing
> memblock_is_map_memory() with memblock_is_memory().
>
> Signed-off-by: Mike Rapoport
> Acked-by: David Hildenbrand
Acked-by: Ard Biesheuvel
... and many thanks for cleaning this up.
> ---
> arch/arm64/Kconfig | 3 ---
> arch/arm64
On Mon, 8 Feb 2021 at 15:32, Will Deacon wrote:
>
> Hi Marc,
>
> On Mon, Feb 08, 2021 at 09:57:09AM +, Marc Zyngier wrote:
> > It recently came to light that there is a need to be able to override
> > some CPU features very early on, before the kernel is fully up and
> > running. The reasons
On Wed, 20 Jan 2021 at 14:01, Will Deacon wrote:
>
> On Wed, 6 Jan 2021 10:34:48 +, Andre Przywara wrote:
> > a fix to v5, now *really* fixing the wrong priority of SMCCC vs. RNDR
> > in arch_get_random_seed_long_early(). Apologies for messing this up
> > in v5 and thanks to broonie for being
m64: mm: extend linear region for 52-bit VA
configurations")
Signed-off-by: Ard Biesheuvel
---
Documentation/arm64/booting.rst | 6 +++---
arch/arm64/kvm/va_layout.c | 18 ++
2 files changed, 17 insertions(+), 7 deletions(-)
diff --git a/Documentation/arm64/booting.rst b
On Tue, 30 Mar 2021 at 15:04, Marc Zyngier wrote:
>
> On Tue, 30 Mar 2021 13:49:18 +0100,
> Ard Biesheuvel wrote:
> >
> > On Tue, 30 Mar 2021 at 14:44, Marc Zyngier wrote:
> > >
> > > On Tue, 30 Mar 2021 12:21:26 +0100,
> > > Ard Biesheuvel
On Tue, 30 Mar 2021 at 14:44, Marc Zyngier wrote:
>
> On Tue, 30 Mar 2021 12:21:26 +0100,
> Ard Biesheuvel wrote:
> >
> > Commit f4693c2716b35d08 ("arm64: mm: extend linear region for 52-bit VA
> > configurations") introduced a new layout for the 52-b
On Tue, 30 Mar 2021 at 15:56, Marc Zyngier wrote:
>
> On Tue, 30 Mar 2021 14:15:19 +0100,
> Ard Biesheuvel wrote:
> >
> > On Tue, 30 Mar 2021 at 15:04, Marc Zyngier wrote:
> > >
> > > On Tue, 30 Mar 2021 13:49:18 +0100,
> > > Ard Biesheuvel wro
On Wed, 6 Jan 2021 at 11:35, Andre Przywara wrote:
>
> From: Ard Biesheuvel
>
> Implement arch_get_random_seed_*() for ARM based on the firmware
> or hypervisor provided entropy source described in ARM DEN0098.
>
> This will make the kernel's random number generator consu
On Fri, 5 Mar 2021 at 12:38, Marc Zyngier wrote:
>
> On Fri, 05 Mar 2021 02:38:17 +,
> Sami Tolvanen wrote:
> >
> > On Thu, Mar 4, 2021 at 2:34 PM Sami Tolvanen
> > wrote:
> > >
> > > On Thu, Mar 4, 2021 at 2:17 PM Marc Zyngier wrote:
> > > >
> > > > On Thu, 04 Mar 2021 21:25:41 +,
>
On Wed, 14 Apr 2021 at 17:14, David Hildenbrand wrote:
>
> On 07.04.21 19:26, Mike Rapoport wrote:
> > From: Mike Rapoport
> >
> > The struct pages representing a reserved memory region are initialized
> > using reserve_bootmem_range() function. This function is called for each
> > reserved
On Tue, 21 Sept 2021 at 21:45, Rob Herring wrote:
>
> On Sun, Sep 5, 2021 at 11:16 PM Gavin Shan wrote:
> >
> > The empty memory nodes, where no memory resides in, are allowed.
> > For these empty memory nodes, the 'len' of 'reg' property is zero.
> > The NUMA node IDs are still valid and
On Fri, 25 Feb 2022 at 03:12, Chen, Rong A wrote:
>
>
>
> Hi Marc, Ard,
>
> We have ignored the warning related to asmlinkage according to the below
> advice:
>
> https://lore.kernel.org/lkml/CAMj1kXHrRYagSVniSetHdG15rkQS+fm4zVOtN=zda3w0qae...@mail.gmail.com/
>
Excellent! Thanks for
On Wed, 23 Feb 2022 at 13:54, Marc Zyngier wrote:
>
> On 2022-02-23 12:34, Philip Li wrote:
> > On Wed, Feb 23, 2022 at 09:16:59AM +, Marc Zyngier wrote:
> >> On Wed, 23 Feb 2022 09:05:18 +,
> >> kernel test robot wrote:
> >> >
> >> > Hi Kalesh,
> >> >
> >> > Thank you for the patch!
rspace (only
> KVM will have a bit more work tracking the EOI), but at least
> this is correct.
>
> Reported-by: Pierre Gondois
> Signed-off-by: Marc Zyngier
> Cc: Ard Biesheuvel
> Cc: Sami Mujawar
> Cc: Will Deacon
Acked-by: Ard Biesheuvel
> ---
> pci.c
; an obviously broken way.
>
> So instead of imposing the M1 workaround on an innocent bystander,
> let's limit it to the two known broken Apple implementations.
>
> Fixes: df652bcf1136 ("KVM: arm64: vgic-v3: Work around GICv3 locally
> generated SErrors")
> Reported-by
As the first step in restricting write access to all page tables via the
linear mapping, remap the page at the root PGD level of a user space
page table hierarchy read-only after allocation, so that it can only be
manipulated using the dedicated fixmap based API.
Signed-off-by: Ard Biesheuvel
their kernel mapping in .bss, so there is no special
exception required to avoid circular logic here.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/Kconfig | 11 +++
arch/arm64/include/asm/fixmap.h | 1 +
arch/arm64/include/asm/pgalloc.h | 28 +-
arch/arm64/include/asm
Implement the arch specific PUD alloc/free helpers by wrapping the
generic code, and remapping the page read-only on allocation and
read-write on free.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/include/asm/pgalloc.h | 5 +
arch/arm64/include/asm/tlb.h | 2 ++
arch/arm64/mm/mmu.c
changes will be posted as a followup series.
Cc: Will Deacon
Cc: Marc Zyngier
Cc: Fuad Tabba
Cc: Quentin Perret
Cc: Mark Rutland
Cc: James Morse
Cc: Catalin Marinas
Ard Biesheuvel (12):
asm-generic/pgalloc: allow arch to override PMD alloc/free routines
arm64: mm: add helpers to remap page
Extend the existing CPP macro based hooks that allow architectures to
specialize the code that allocates and frees pages to be used as page
tables.
Signed-off-by: Ard Biesheuvel
---
include/asm-generic/pgalloc.h | 13 +++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git
-by: Ard Biesheuvel
---
arch/arm64/include/asm/pgtable.h | 3 +++
arch/arm64/mm/pageattr.c | 14 ++
2 files changed, 17 insertions(+)
diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index c4ba047a82d2..8d3806c68687 100644
--- a/arch/arm64/include
The set_pte() helper does not carry the struct mm pointer, which makes
it difficult for the implementation to reason about the context in which
the set_pte() call is taking place. So switch to set_pte_at() instead.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/kernel/efi.c | 2 +-
1 file changed
Implement a default version of p4d_index() similar to how pud/pmd_index
are defined.
Signed-off-by: Ard Biesheuvel
---
include/linux/pgtable.h | 8
1 file changed, 8 insertions(+)
diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h
index bc8713a76e03..e8aacf6ea207 100644
PMD modifications all go through the fixmap update routine, so there is
no longer a need to keep it mapped read/write in the linear region.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/include/asm/pgalloc.h | 5 +
arch/arm64/include/asm/tlb.h | 2 ++
arch/arm64/mm/mmu.c
Now that all PTE manipulations for user space tables go via the fixmap,
we can remap these tables read-only in the linear region so they cannot
be corrupted inadvertently.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/include/asm/pgalloc.h | 5 +
arch/arm64/include/asm/tlb.h | 2
Now that all kernel page table manipulations are routed through the
fixmap API if r/o page tables are enabled, we can remove write access
from the linear mapping of those pages.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/include/asm/pgalloc.h | 6 +
arch/arm64/mm/mmu.c | 24
Now that all the handling is in place to deal with read-only page tables
at runtime, do a pass over the kernel page tables at boot to remap all
the page table pages read-only that were allocated early.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/mm/mmu.c | 20
1 file
Switch to set_pte_at() so we can provide the mm pointer to the code that
performs the page table update.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/mm/hugetlbpage.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm
references, but this is no longer the case, so
we can simply use relative addressing instead. This removes a couple of
RELA entries pointing into the .text segment.
Signed-off-by: Ard Biesheuvel
---
arch/arm64/kvm/hyp/nvhe/host.S | 8 +++-
1 file changed, 3 insertions(+), 5 deletions
nd-up
> with two back-to-back faults (page being evicted and faulted back).
> I don't think this is a case worth optimising for.
>
> Fixes: c4ad98e4b72c ("KVM: arm64: Assume write fault on S1PTW permission
> fault on instruction fetch")
> Signed-off-by: Marc Zyngier
&
On Sat, 24 Dec 2022 at 13:19, Marc Zyngier wrote:
>
> On Thu, 22 Dec 2022 13:01:55 +0000,
> Ard Biesheuvel wrote:
> >
> > On Tue, 20 Dec 2022 at 21:09, Marc Zyngier wrote:
> > >
> > > A recent development on the EFI front has resulted in gues
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