ce hase to enable the capability.
With that knob we can later on disable this feature for live migration.
Dominik Dingel (4):
PF: Add FAULT_FLAG_RETRY_NOWAIT for guest fault
PF: Move architecture specifics to the backends
PF: Additional flag for direct page fault inject
PF: Intial async
: Dominik Dingel
---
arch/s390/include/asm/processor.h | 7 +++
arch/s390/kvm/kvm-s390.c | 15 +++
arch/s390/mm/fault.c | 29 +
arch/s390/mm/pgtable.c| 1 +
4 files changed, 48 insertions(+), 4 deletions(-)
diff --git a/arch
This patch adds the handling for async page faults to s390x code.
It provides the userspace API to enable, disable or get the
status of this feature.
Also it includes the diagnose code, called by the guest, to enable
async page faults by pfault or disable them.
Signed-off-by: Dominik Dingel
insert the page to the queue.
So if we are not able to schedule the async page, we have to remove it from
the list again. As this is only when we also have to page in synchronously,
the overhead is not really important.
Signed-off-by: Dominik Dingel
---
arch/x86/kvm/mmu.c | 2 +-
include
Current common code use PAGE_OFFSET to indicate a bad host virtual address.
This works for x86 but not necessarily on other architectures. So the check
is moved into architecture specific code.
Todo:
- apply to other architectures when applicable
Signed-off-by: Dominik Dingel
---
arch/s390
Current common codes uses PAGE_OFFSET to indicate a bad host virtual address.
As this check won't work on architectures that don't map kernel and user memory
into the same address space (e.g. s390), it is moved into architcture specific
code.
Signed-off-by: Dominik Dingel
---
arch/a
ce hase to enable the capability.
With that knob we can later on disable this feature for live migration.
v1 -> v2:
- Adding other architecture backends
- Adding documentation for the ioctl
- Improving the overall error handling
- Reducing the needed modifications on the common code
Domi
guest interface for this
purpose, as described in "CP Programming Services" (SC24-6084)".
Signed-off-by: Dominik Dingel
---
Documentation/s390/kvm.txt | 24 ++
arch/s390/include/asm/kvm_host.h | 22 +
arch/s390/include/uapi/asm/kvm.h | 10
arch/s
In case of a fault retry exit sie64() with gmap_fault indication for the
running thread set. This makes it possible to handle async page faults
without the need for mm notifiers.
Based on a patch from Martin Schwidefsky.
Signed-off-by: Dominik Dingel
---
arch/s390/include/asm/pgtable.h | 2
will directly push the information to the guest.
Still the vcpu thread should call check_completion to cleanup leftovers,
that leaves most of the common code untouched.
Signed-off-by: Dominik Dingel
---
arch/x86/kvm/mmu.c | 2 +-
include/linux/kvm_host.h | 2 +-
virt/kvm/Kconfig
this
purpose, as described in "CP Programming Services (SC24-6084)".
Signed-off-by: Dominik Dingel
---
Documentation/s390/kvm.txt | 24 ++
arch/s390/include/asm/kvm_host.h | 22 +
arch/s390/include/uapi/asm/kvm.h | 10
arch/s390/kvm/Kconfig|
ned-off-by: Dominik Dingel
---
include/linux/kvm_host.h | 14 ++
1 file changed, 14 insertions(+)
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index a63d83e..f3c04e7 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -85,6 +85,18 @@ static i
handling
v1 -> v2:
- Adding other architecture backends
- Adding documentation for the ioctl
- Improving the overall error handling
- Reducing the needed modifications on the common code
Dominik Dingel (4):
PF: Add FAULT_FLAG_RETRY_NOWAIT for guest fault
PF: Make KVM_HVA_ERR_BAD usa
will directly push the information to the guest.
Still the vcpu thread should call check_completion to cleanup leftovers,
that leaves most of the common code untouched.
Signed-off-by: Dominik Dingel
---
arch/x86/kvm/mmu.c | 2 +-
include/linux/kvm_host.h | 2 +-
virt/kvm/Kconfig
In case of a fault retry exit sie64() with gmap_fault indication for the
running thread set. This makes it possible to handle async page faults
without the need for mm notifiers.
Based on a patch from Martin Schwidefsky.
Signed-off-by: Dominik Dingel
---
arch/s390/include/asm/pgtable.h | 2
Current common code uses PAGE_OFFSET to indicate a bad host virtual address.
As this check won't work on architectures that don't map kernel and user memory
into the same address space (e.g. s390), such architectures can now provide
there own KVM_HVA_ERR_BAD defines.
Signed-off-by: Domi
In case of a fault retry exit sie64() with gmap_fault indication for the
running thread set. This makes it possible to handle async page faults
without the need for mm notifiers.
Based on a patch from Martin Schwidefsky.
Signed-off-by: Dominik Dingel
Acked-by: Christian Borntraeger
---
arch
ll error handling
- Reducing the needed modifications on the common code
Dominik Dingel (4):
PF: Add FAULT_FLAG_RETRY_NOWAIT for guest fault
PF: Make KVM_HVA_ERR_BAD usable on s390
PF: Provide additional direct page notification
PF: Async page fault support on s390
Documentat
this
purpose, as described in "CP Programming Services (SC24-6084)".
Signed-off-by: Dominik Dingel
---
Documentation/s390/kvm.txt | 24 +
arch/s390/include/asm/kvm_host.h | 22
arch/s390/include/uapi/asm/kvm.h | 10
arch/s390/kvm/Kconfig|
will directly push the information to the guest.
This way s390 can use an already existing architecture interface.
Still the vcpu thread should call check_completion to cleanup leftovers,
that leaves most of the common code untouched.
Signed-off-by: Dominik Dingel
Acked-by: Christian Borntraeger
Replace the s390 specific page table walker for the pgste updates
with a call to the common code walk_page_range function.
There are now two pte modification functions, one for the reset
of the CMMA state and another one for the initialization of the
storage keys.
Signed-off-by: Dominik Dingel
Add a new vma flag to allow an architecture to disable the backing
of non-present, anonymous pages with the read-only empty zero page.
Signed-off-by: Dominik Dingel
Acked-by: Christian Borntraeger
Signed-off-by: Martin Schwidefsky
---
include/linux/mm.h | 13 +++--
mm/huge_memory.c
guest memory.
Dominik Dingel (4):
s390/mm: recfactor global pgste updates
mm: introduce new VM_NOZEROPAGE flag
s390/mm: prevent and break zero page mappings in case of storage keys
s390/mm: disable KSM for storage key enabled pages
arch/s390/Kconfig | 3 +
arch/s390/includ
n need to retry the fixup_user_fault.
Signed-off-by: Dominik Dingel
Acked-by: Christian Borntraeger
Signed-off-by: Martin Schwidefsky
---
arch/s390/Kconfig | 3 +++
arch/s390/mm/pgtable.c | 15 +++
2 files changed, 18 insertions(+)
diff --git a/arch/s390/Kconfig b/arch/s39
When storage keys are enabled unmerge already merged pages and prevent
new pages from being merged.
Signed-off-by: Dominik Dingel
Acked-by: Christian Borntraeger
Signed-off-by: Martin Schwidefsky
---
arch/s390/include/asm/pgtable.h | 2 +-
arch/s390/kvm/priv.c| 17
On Fri, 17 Oct 2014 15:04:21 -0700
Dave Hansen wrote:
> Is there ever a time where the VMAs under an mm have mixed VM_NOZEROPAGE
> status? Reading the patches, it _looks_ like it might be an all or
> nothing thing.
Currently it is an all or nothing thing, but for a future change we might want
On Tue, 21 Oct 2014 10:11:43 +0200
Paolo Bonzini wrote:
>
>
> On 10/21/2014 08:11 AM, Martin Schwidefsky wrote:
> >> I agree with Dave (I thought I disagreed, but I changed my mind while
> >> writing down my thoughts). Just define mm_forbids_zeropage in
> >> arch/s390/include/asm, and make it
Replace the s390 specific page table walker for the pgste updates
with a call to the common code walk_page_range function.
There are now two pte modification functions, one for the reset
of the CMMA state and another one for the initialization of the
storage keys.
Signed-off-by: Dominik Dingel
guest memory.
v1 -> v2:
- Following Dave and Paolo suggestion removing the vma flag
Dominik Dingel (4):
s390/mm: recfactor global pgste updates
mm: introduce mm_forbids_zeropage function
s390/mm: prevent and break zero page mappings in case of storage keys
s390/mm: disable KSM for sto
When storage keys are enabled unmerge already merged pages and prevent
new pages from being merged.
Signed-off-by: Dominik Dingel
Acked-by: Christian Borntraeger
---
arch/s390/include/asm/pgtable.h | 2 +-
arch/s390/kvm/priv.c| 17 -
arch/s390/mm/pgtable.c
and host large pages are also mutual exclusive we do not even
need to retry the fixup_user_fault.
As use_skey is already the condition on which we call s390_enable_skey
we need to introduce a new flag for the mm->context on which we decide
if zero page mapping is allowed.
Signed-off-by: Do
Add a new function stub to allow architectures to disable for
an mm_structthe backing of non-present, anonymous pages with
read-only empty zero pages.
Signed-off-by: Dominik Dingel
---
include/linux/mm.h | 4
mm/huge_memory.c | 2 +-
mm/memory.c| 2 +-
3 files changed, 6
On Wed, 22 Oct 2014 12:09:31 +0200
Paolo Bonzini wrote:
> On 10/22/2014 10:30 AM, Dominik Dingel wrote:
> > As use_skey is already the condition on which we call s390_enable_skey
> > we need to introduce a new flag for the mm->context on which we decide
> > if zero
Add a new function stub to allow architectures to disable for
an mm_structthe backing of non-present, anonymous pages with
read-only empty zero pages.
Signed-off-by: Dominik Dingel
---
include/linux/mm.h | 4
mm/huge_memory.c | 2 +-
mm/memory.c| 2 +-
3 files changed, 6
When storage keys are enabled unmerge already merged pages and prevent
new pages from being merged.
Signed-off-by: Dominik Dingel
Acked-by: Christian Borntraeger
---
arch/s390/include/asm/pgtable.h | 2 +-
arch/s390/kvm/priv.c| 17 -
arch/s390/mm/pgtable.c
Replace the s390 specific page table walker for the pgste updates
with a call to the common code walk_page_range function.
There are now two pte modification functions, one for the reset
of the CMMA state and another one for the initialization of the
storage keys.
Signed-off-by: Dominik Dingel
her vCPUs executing storage key instructions will get a one time interception
and be serialized also with mmap_sem.
Signed-off-by: Dominik Dingel
---
arch/s390/include/asm/pgtable.h | 5 +
arch/s390/mm/pgtable.c | 13 -
2 files changed, 17 insertions(+), 1 deletion(-)
diff --g
guest memory.
v2 -> v3:
- Clearing up patch description Patch 3/4
- removing unnecessary flag in mmu_context (Paolo)
v1 -> v2:
- Following Dave and Paolo suggestion removing the vma flag
Dominik Dingel (4):
s390/mm: recfactor global pgste updates
mm: introduce mm_forbids_zeropa
On Wed, 22 Oct 2014 12:22:23 -0700
Andrew Morton wrote:
> On Wed, 22 Oct 2014 13:09:28 +0200 Dominik Dingel
> wrote:
>
> > Add a new function stub to allow architectures to disable for
> > an mm_structthe backing of non-present, anonymous pages with
> >
commit 72dc67a69690 ("KVM: remove the usage of the mmap_sem for the protection
of the memory slots.")
changed the lock which will be taken. This should be reflected in the function
commentary.
Signed-off-by: Dominik Dingel
---
virt/kvm/kvm_main.c | 2 +-
1 file changed, 1 inser
Commit f78195129963 ("kvm: add halt_poll_ns module parameter") calls, with
enabled preemption, single_task_running. When CONFIG_DEBUG_PREEMPT is
enabled that will result in a debug_smp_processor_id() call.
Cc: # 4.2.x
Signed-off-by: Dominik Dingel
---
virt/kvm/kvm_main.c | 8 ++
On Thu, 17 Sep 2015 18:45:00 +0200
Paolo Bonzini wrote:
>
>
> On 17/09/2015 18:27, Dominik Dingel wrote:
> > + preempt_disable();
> > + solo = single_task_running();
> > + preempt_enable();
> > +
> &
t the usefulness,
we change single_task_running to access directly the cpu local runqueue.
Cc: Tim Chen
Suggested-by: Peter Zijlstra
Cc: # 4.2.x
Signed-off-by: Dominik Dingel
---
kernel/sched/core.c | 8
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/kernel/sched/core.c b
On Fri, 18 Sep 2015 13:26:53 +0200
Paolo Bonzini wrote:
>
>
> On 18/09/2015 11:27, Dominik Dingel wrote:
> > Commit 2ee507c47293 ("sched: Add function single_task_running to let a task
> > check if it is the only task running on a cpu") referenced th
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