On Thu, 24 Sep 2020 16:28:58 +0300 Mike Rapoport wrote:
> From: Mike Rapoport
>
> Hi,
>
> This is an implementation of "secret" mappings backed by a file descriptor.
> I've dropped the boot time reservation patch for now as it is not strictly
> required for the basic usage and can be easily
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On 23.09.20 23:41, Dan Williams wrote:
> On Wed, Sep 23, 2020 at 1:04 AM David Hildenbrand wrote:
>>
>> On 08.09.20 17:33, Joao Martins wrote:
>>> [Sorry for the late response]
>>>
>>> On 8/21/20 11:06 AM, David Hildenbrand wrote:
On 03.08.20 07:03, Dan Williams wrote:
> @@ -37,109
From: Mike Rapoport
Wire up memfd_secret system call on architectures that define
ARCH_HAS_SET_DIRECT_MAP, namely arm64, risc-v and x86.
Signed-off-by: Mike Rapoport
Acked-by: Palmer Dabbelt
Acked-by: Arnd Bergmann
---
arch/arm64/include/asm/unistd.h| 2 +-
From: Mike Rapoport
It will be used by the upcoming secret memory implementation.
Signed-off-by: Mike Rapoport
---
mm/internal.h | 3 +++
mm/mmap.c | 5 ++---
2 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/mm/internal.h b/mm/internal.h
index 10c677655912..40544fbf49c9
From: Mike Rapoport
Removing a PAGE_SIZE page from the direct map every time such page is
allocated for a secret memory mapping will cause severe fragmentation of
the direct map. This fragmentation can be reduced by using PMD-size pages
as a pool for small pages for secret memory mappings.
Add
From: Mike Rapoport
The definition of PMD_PAGE_ORDER denoting the number of base pages in the
second-level leaf page is already used by DAX and maybe handy in other
cases as well.
Several architectures already have definition of PMD_ORDER as the size of
second level page table, so to avoid
From: Mike Rapoport
Hi,
This is an implementation of "secret" mappings backed by a file descriptor.
I've dropped the boot time reservation patch for now as it is not strictly
required for the basic usage and can be easily added later either with or
without CMA.
v6 changes:
* Silence the
From: Mike Rapoport
Introduce "memfd_secret" system call with the ability to create memory
areas visible only in the context of the owning process and not mapped not
only to other processes but in the kernel page tables as well.
The user will create a file descriptor using the memfd_secret()
From: Mike Rapoport
The test verifies that file descriptor created with memfd_secret does
not allow read/write operations, that secret memory mappings respect
RLIMIT_MEMLOCK and that remote accesses with process_vm_read() and
ptrace() to the secret memory fail.
Signed-off-by: Mike Rapoport
---
On Thu, Sep 24, 2020 at 12:26 AM David Hildenbrand wrote:
>
> On 23.09.20 23:41, Dan Williams wrote:
> > On Wed, Sep 23, 2020 at 1:04 AM David Hildenbrand wrote:
> >>
> >> On 08.09.20 17:33, Joao Martins wrote:
> >>> [Sorry for the late response]
> >>>
> >>> On 8/21/20 11:06 AM, David
On 24.09.20 15:54, Dan Williams wrote:
> On Thu, Sep 24, 2020 at 12:26 AM David Hildenbrand wrote:
>>
>> On 23.09.20 23:41, Dan Williams wrote:
>>> On Wed, Sep 23, 2020 at 1:04 AM David Hildenbrand wrote:
On 08.09.20 17:33, Joao Martins wrote:
> [Sorry for the late response]
>
[..]
> > I'm not suggesting to busy the whole "virtio" range, just the portion
> > that's about to be passed to add_memory_driver_managed().
>
> I'm afraid I don't get your point. For virtio-mem:
>
> Before:
>
> 1. Create virtio0 container resource
>
> 2. (somewhen in the future)
> Am 24.09.2020 um 23:26 schrieb Dan Williams :
>
> [..]
>>> I'm not suggesting to busy the whole "virtio" range, just the portion
>>> that's about to be passed to add_memory_driver_managed().
>>
>> I'm afraid I don't get your point. For virtio-mem:
>>
>> Before:
>>
>> 1. Create virtio0
On Tue, Sep 1, 2020 at 1:33 AM Roger Pau Monne wrote:
>
> This is in preparation for the logic behind MEMORY_DEVICE_DEVDAX also
> being used by non DAX devices.
>
FWIW I would not call this MEMORY_DEVICE_GENERIC. This is really
MEMORY_DEVICE_SIMPLE and the kernel-doc can clarify in contrast to
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On Thu, Sep 24, 2020 at 2:42 PM David Hildenbrand wrote:
>
>
>
> > Am 24.09.2020 um 23:26 schrieb Dan Williams :
> >
> > [..]
> >>> I'm not suggesting to busy the whole "virtio" range, just the portion
> >>> that's about to be passed to add_memory_driver_managed().
> >>
> >> I'm afraid I don't
From: Mike Rapoport
Signed-off-by: Mike Rapoport
---
man2/memfd_secret.2 | 176
1 file changed, 176 insertions(+)
create mode 100644 man2/memfd_secret.2
diff --git a/man2/memfd_secret.2 b/man2/memfd_secret.2
new file mode 100644
index
On Tue, 22 Sep 2020, Matthew Wilcox wrote:
> > > The NVFS indirect block tree has a fan-out of 16,
> >
> > No. The top level in the inode contains 16 blocks (11 direct and 5
> > indirect). And each indirect block can have 512 pointers (4096/8). You can
> > format the device with larger
* Mike Rapoport:
> +.PP
> +.IR Note :
> +There is no glibc wrapper for this system call; see NOTES.
You added a reference to NOTES, but then in notes there is nothing about
it. I guess you wanted to add the following to NOTES (taken from
membarrier.2):
.PP
Glibc does not provide a wrapper
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