On 12/02/2024 16:24, David Hildenbrand wrote:
> On 12.02.24 16:34, Ryan Roberts wrote:
>> On 12/02/2024 15:26, David Hildenbrand wrote:
>>> On 12.02.24 15:45, Ryan Roberts wrote:
On 12/02/2024 13:54, David Hildenbrand wrote:
>>> If so, I wonder if we could instead do that comparison modulo
On 13/02/2024 14:08, Ard Biesheuvel wrote:
> On Tue, 13 Feb 2024 at 15:05, David Hildenbrand wrote:
>>
>> On 13.02.24 15:02, Ryan Roberts wrote:
>>> On 13/02/2024 13:45, David Hildenbrand wrote:
On 13.02.24 14:33, Ard Biesheuvel wrote:
> On Tue, 13 Feb 2024 at 14:21, Ryan Roberts wrote:
On Tue, 13 Feb 2024 at 15:05, David Hildenbrand wrote:
>
> On 13.02.24 15:02, Ryan Roberts wrote:
> > On 13/02/2024 13:45, David Hildenbrand wrote:
> >> On 13.02.24 14:33, Ard Biesheuvel wrote:
> >>> On Tue, 13 Feb 2024 at 14:21, Ryan Roberts wrote:
>
> On 13/02/2024 13:13, David Hilden
On 13.02.24 15:02, Ryan Roberts wrote:
On 13/02/2024 13:45, David Hildenbrand wrote:
On 13.02.24 14:33, Ard Biesheuvel wrote:
On Tue, 13 Feb 2024 at 14:21, Ryan Roberts wrote:
On 13/02/2024 13:13, David Hildenbrand wrote:
On 13.02.24 14:06, Ryan Roberts wrote:
On 13/02/2024 12:19, David Hi
On 13/02/2024 13:45, David Hildenbrand wrote:
> On 13.02.24 14:33, Ard Biesheuvel wrote:
>> On Tue, 13 Feb 2024 at 14:21, Ryan Roberts wrote:
>>>
>>> On 13/02/2024 13:13, David Hildenbrand wrote:
On 13.02.24 14:06, Ryan Roberts wrote:
> On 13/02/2024 12:19, David Hildenbrand wrote:
>>
On 13.02.24 14:33, Ard Biesheuvel wrote:
On Tue, 13 Feb 2024 at 14:21, Ryan Roberts wrote:
On 13/02/2024 13:13, David Hildenbrand wrote:
On 13.02.24 14:06, Ryan Roberts wrote:
On 13/02/2024 12:19, David Hildenbrand wrote:
On 13.02.24 13:06, Ryan Roberts wrote:
On 12/02/2024 20:38, Ryan Rob
On Tue, 13 Feb 2024 at 14:21, Ryan Roberts wrote:
>
> On 13/02/2024 13:13, David Hildenbrand wrote:
> > On 13.02.24 14:06, Ryan Roberts wrote:
> >> On 13/02/2024 12:19, David Hildenbrand wrote:
> >>> On 13.02.24 13:06, Ryan Roberts wrote:
> On 12/02/2024 20:38, Ryan Roberts wrote:
> > [..
On 13/02/2024 13:22, David Hildenbrand wrote:
> On 13.02.24 14:20, Ryan Roberts wrote:
>> On 13/02/2024 13:13, David Hildenbrand wrote:
>>> On 13.02.24 14:06, Ryan Roberts wrote:
On 13/02/2024 12:19, David Hildenbrand wrote:
> On 13.02.24 13:06, Ryan Roberts wrote:
>> On 12/02/2024 20:
On 13.02.24 14:20, Ryan Roberts wrote:
On 13/02/2024 13:13, David Hildenbrand wrote:
On 13.02.24 14:06, Ryan Roberts wrote:
On 13/02/2024 12:19, David Hildenbrand wrote:
On 13.02.24 13:06, Ryan Roberts wrote:
On 12/02/2024 20:38, Ryan Roberts wrote:
[...]
+static inline bool mm_is_user(str
On 13/02/2024 13:13, David Hildenbrand wrote:
> On 13.02.24 14:06, Ryan Roberts wrote:
>> On 13/02/2024 12:19, David Hildenbrand wrote:
>>> On 13.02.24 13:06, Ryan Roberts wrote:
On 12/02/2024 20:38, Ryan Roberts wrote:
> [...]
>
> +static inline bool mm_is_user(struct mm_struc
On 13.02.24 14:06, Ryan Roberts wrote:
On 13/02/2024 12:19, David Hildenbrand wrote:
On 13.02.24 13:06, Ryan Roberts wrote:
On 12/02/2024 20:38, Ryan Roberts wrote:
[...]
+static inline bool mm_is_user(struct mm_struct *mm)
+{
+ /*
+ * Don't attempt to apply the contig bit to kernel m
On 13/02/2024 12:19, David Hildenbrand wrote:
> On 13.02.24 13:06, Ryan Roberts wrote:
>> On 12/02/2024 20:38, Ryan Roberts wrote:
>>> [...]
>>>
>>> +static inline bool mm_is_user(struct mm_struct *mm)
>>> +{
>>> + /*
>>> + * Don't attempt to apply the contig bit to kernel ma
On 13/02/2024 12:02, Mark Rutland wrote:
> On Mon, Feb 12, 2024 at 12:59:57PM +, Ryan Roberts wrote:
>> On 12/02/2024 12:00, Mark Rutland wrote:
>>> Hi Ryan,
>
> [...]
>
+static inline void set_pte(pte_t *ptep, pte_t pte)
+{
+ /*
+ * We don't have the mm or vaddr so can
On 13.02.24 13:06, Ryan Roberts wrote:
On 12/02/2024 20:38, Ryan Roberts wrote:
[...]
+static inline bool mm_is_user(struct mm_struct *mm)
+{
+ /*
+* Don't attempt to apply the contig bit to kernel mappings, because
+* dynamically adding/removing the contig bit can cause
On 12/02/2024 20:38, Ryan Roberts wrote:
> [...]
>
> +static inline bool mm_is_user(struct mm_struct *mm)
> +{
> + /*
> + * Don't attempt to apply the contig bit to kernel mappings, because
> + * dynamically adding/removing the contig bit can cause page faults.
> + * The
On Mon, Feb 12, 2024 at 12:59:57PM +, Ryan Roberts wrote:
> On 12/02/2024 12:00, Mark Rutland wrote:
> > Hi Ryan,
[...]
> >> +static inline void set_pte(pte_t *ptep, pte_t pte)
> >> +{
> >> + /*
> >> + * We don't have the mm or vaddr so cannot unfold contig entries (since
> >> + * it req
On 12.02.24 21:38, Ryan Roberts wrote:
[...]
+static inline bool mm_is_user(struct mm_struct *mm)
+{
+ /*
+* Don't attempt to apply the contig bit to kernel mappings, because
+* dynamically adding/removing the contig bit can cause page faults.
+* These racing fault
[...]
+static inline bool mm_is_user(struct mm_struct *mm)
+{
+ /*
+ * Don't attempt to apply the contig bit to kernel mappings, because
+ * dynamically adding/removing the contig bit can cause page faults.
+ * These racing faults are ok for user space, since t
On 12.02.24 16:34, Ryan Roberts wrote:
On 12/02/2024 15:26, David Hildenbrand wrote:
On 12.02.24 15:45, Ryan Roberts wrote:
On 12/02/2024 13:54, David Hildenbrand wrote:
If so, I wonder if we could instead do that comparison modulo the access/dirty
bits,
I think that would work - but will ne
On 12/02/2024 15:26, David Hildenbrand wrote:
> On 12.02.24 15:45, Ryan Roberts wrote:
>> On 12/02/2024 13:54, David Hildenbrand wrote:
> If so, I wonder if we could instead do that comparison modulo the
> access/dirty
> bits,
I think that would work - but will need to think
On 12/02/2024 12:59, Ryan Roberts wrote:
> On 12/02/2024 12:00, Mark Rutland wrote:
>> Hi Ryan,
>>
>> Overall this looks pretty good; I have a bunch of minor comments below, and a
>> bigger question on the way ptep_get_lockless() works.
>
> OK great - thanks for the review. Let's see if I can answ
On 12.02.24 15:45, Ryan Roberts wrote:
On 12/02/2024 13:54, David Hildenbrand wrote:
If so, I wonder if we could instead do that comparison modulo the access/dirty
bits,
I think that would work - but will need to think a bit more on it.
and leave ptep_get_lockless() only reading a single ent
On 12/02/2024 13:54, David Hildenbrand wrote:
>>> If so, I wonder if we could instead do that comparison modulo the
>>> access/dirty
>>> bits,
>>
>> I think that would work - but will need to think a bit more on it.
>>
>>> and leave ptep_get_lockless() only reading a single entry?
>>
>> I think we
If so, I wonder if we could instead do that comparison modulo the access/dirty
bits,
I think that would work - but will need to think a bit more on it.
and leave ptep_get_lockless() only reading a single entry?
I think we will need to do something a bit less fragile. ptep_get() does collect
On 12/02/2024 12:00, Mark Rutland wrote:
> Hi Ryan,
>
> Overall this looks pretty good; I have a bunch of minor comments below, and a
> bigger question on the way ptep_get_lockless() works.
OK great - thanks for the review. Let's see if I can answer them all...
>
> On Fri, Feb 02, 2024 at 08:07
Hi Ryan,
Overall this looks pretty good; I have a bunch of minor comments below, and a
bigger question on the way ptep_get_lockless() works.
On Fri, Feb 02, 2024 at 08:07:50AM +, Ryan Roberts wrote:
> With the ptep API sufficiently refactored, we can now introduce a new
> "contpte" API layer,
With the ptep API sufficiently refactored, we can now introduce a new
"contpte" API layer, which transparently manages the PTE_CONT bit for
user mappings.
In this initial implementation, only suitable batches of PTEs, set via
set_ptes(), are mapped with the PTE_CONT bit. Any subsequent
modificatio
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