On Tue, Nov 29, 2022 at 09:15:21PM +, Oliver Upton wrote:
> Hi Ricardo,
>
> Thanks for having a look.
>
> On Tue, Nov 29, 2022 at 12:52:12PM -0800, Ricardo Koller wrote:
> > On Tue, Nov 29, 2022 at 07:19:44PM +, Oliver Upton wrote:
>
> [...]
>
> > > + ret =
Hi Ricardo,
Thanks for having a look.
On Tue, Nov 29, 2022 at 12:52:12PM -0800, Ricardo Koller wrote:
> On Tue, Nov 29, 2022 at 07:19:44PM +, Oliver Upton wrote:
[...]
> > + ret = stage2_update_leaf_attrs(pgt, addr, 1,
> > KVM_PTE_LEAF_ATTR_LO_S2_AF, 0,
> > +
On Tue, Nov 29, 2022 at 07:19:45PM +, Oliver Upton wrote:
> As the underlying software walkers are able to traverse and update
> stage-2 in parallel there is no need to serialize access faults.
>
> Only take the read lock when handling an access fault.
>
> Signed-off-by: Oliver Upton
> ---
On Tue, Nov 29, 2022 at 07:19:44PM +, Oliver Upton wrote:
> Of course, if the PTE wasn't changed then there are absolutely no
> serialization requirements. Skip the DSB for an unsuccessful update to
> the access flag.
>
> Signed-off-by: Oliver Upton
> ---
> arch/arm64/kvm/hyp/pgtable.c | 10
As it currently stands, KVM makes use of FEAT_HAFDBS unconditionally.
Use of the feature in the rest of the kernel is guarded by an associated
Kconfig option.
Align KVM with the rest of the kernel and only enable VTCR_HA when
ARM64_HW_AFDBM is enabled. This can be helpful for testing changes to
Of course, if the PTE wasn't changed then there are absolutely no
serialization requirements. Skip the DSB for an unsuccessful update to
the access flag.
Signed-off-by: Oliver Upton
---
arch/arm64/kvm/hyp/pgtable.c | 10 +++---
1 file changed, 7 insertions(+), 3 deletions(-)
diff --git
As the underlying software walkers are able to traverse and update
stage-2 in parallel there is no need to serialize access faults.
Only take the read lock when handling an access fault.
Signed-off-by: Oliver Upton
---
arch/arm64/kvm/hyp/pgtable.c | 2 +-
arch/arm64/kvm/mmu.c | 4 ++--
Consistently use KVM's own pte types and helpers in
handle_access_fault().
No functional change intended.
Signed-off-by: Oliver Upton
---
arch/arm64/include/asm/kvm_pgtable.h | 5 +
arch/arm64/kvm/mmu.c | 10 --
2 files changed, 9 insertions(+), 6 deletions(-)
When I implemented the parallel faults series I was mostly focused on
improving the performance of 8.1+ implementations which bring us
FEAT_HAFDBS. In so doing, I failed to put access faults on the read side
of the MMU lock.
Anyhow, this small series adds support for handling access faults in
On Fri, 18 Nov 2022 21:15:01 +, Oliver Upton wrote:
> Small series to add support for arm64 to access_tracking_perf_test and
> correct a couple bugs along the way.
>
> Tested on Ampere Altra w/ all supported guest modes.
>
> v1 -> v2:
> - Have perf_test_util indicate when to stop vCPU
On Thu, 3 Nov 2022 18:10:33 -0700, Peter Collingbourne wrote:
> This patch series allows VMMs to use shared mappings in MTE enabled
> guests. The first five patches were taken from Catalin's tree [1] which
> addressed some review feedback from when they were previously sent out
> as v3 of this
Rob Herring writes:
> On Fri, Nov 18, 2022 at 10:49 AM Will Deacon wrote:
>>
>> On Fri, Nov 04, 2022 at 10:55:07AM -0500, Rob Herring wrote:
>> > @@ -515,6 +516,8 @@ struct perf_event_attr {
>> >* truncated accordingly on 32 bit architectures.
>> >*/
>> > __u64 sig_data;
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