Displaying 6 results from an estimated 6 matches for "set_pte_at_notify".
2019 Mar 08
2
[RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address
On 2019/3/8 ??5:27, Andrea Arcangeli wrote:
> Hello Jerome,
>
> On Thu, Mar 07, 2019 at 03:17:22PM -0500, Jerome Glisse wrote:
>> So for the above the easiest thing is to call set_page_dirty() from
>> the mmu notifier callback. It is always safe to use the non locking
>> variant from such callback. Well it is safe only if the page was
>> map with write permission
2019 Mar 08
2
[RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address
On 2019/3/8 ??5:27, Andrea Arcangeli wrote:
> Hello Jerome,
>
> On Thu, Mar 07, 2019 at 03:17:22PM -0500, Jerome Glisse wrote:
>> So for the above the easiest thing is to call set_page_dirty() from
>> the mmu notifier callback. It is always safe to use the non locking
>> variant from such callback. Well it is safe only if the page was
>> map with write permission
2019 Mar 08
0
[RFC PATCH V2 5/5] vhost: access vq metadata through kernel virtual address
...ge_start (which is called before the pin checks).
Here's why:
/*
* Check that no O_DIRECT or similar I/O is in progress on the
* page
*/
if (page_mapcount(page) + 1 + swapped != page_count(page)) {
set_pte_at(mm, pvmw.address, pvmw.pte, entry);
goto out_unlock;
}
[..]
set_pte_at_notify(mm, pvmw.address, pvmw.pte, entry);
^^^^^^^ too late release the pin here, the
above already failed
->invalidate_range cannot be used with mutex anyway so you need to go
back with invalidate_range_start/end anyway, just the pin must be
released in _start at the latest in such case....
2019 Aug 09
6
[RFC PATCH v6 71/92] mm: add support for remote mapping
...f (unlikely(pte_present(*ptep))) {
+ atomic_inc(&stat_refault);
+ result = -EAGAIN;
+ goto out_unlock;
+ }
+
+ /* create new PTE based on requested page */
+ pte = mk_pte(req_page, map_vma->vm_page_prot);
+ if (map_vma->vm_flags & VM_WRITE)
+ pte = pte_mkwrite(pte_mkdirty(pte));
+ set_pte_at_notify(map_mm, map_hva, ptep, pte);
+
+ inc_mm_counter(map_mm, MM_ANONPAGES);
+
+out_unlock:
+ pte_unmap_unlock(ptep, ptl);
+
+ return result;
+}
+
+static void mm_remote_put_req(struct page *req_page,
+ struct anon_vma *req_anon_vma)
+{
+ if (req_anon_vma)
+ put_anon_vma(req_anon_vma);
+
+ if (r...
2019 Aug 09
117
[RFC PATCH v6 00/92] VM introspection
The KVM introspection subsystem provides a facility for applications running
on the host or in a separate VM, to control the execution of other VM-s
(pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.),
alter the page access bits in the shadow page tables (only for the hardware
backed ones, eg. Intel's EPT) and receive notifications when events of
interest have taken place
2019 Aug 09
117
[RFC PATCH v6 00/92] VM introspection
The KVM introspection subsystem provides a facility for applications running
on the host or in a separate VM, to control the execution of other VM-s
(pause, resume, shutdown), query the state of the vCPUs (GPRs, MSRs etc.),
alter the page access bits in the shadow page tables (only for the hardware
backed ones, eg. Intel's EPT) and receive notifications when events of
interest have taken place