: Michael Roth
Cc: k...@vger.kernel.org
Cc: linux-kselft...@vger.kernel.org
Signed-off-by: Peter Gonda
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/include/x86/sev.h | 1 +
.../testing/selftests/kvm/lib/x86/processor.c | 9 +++
tools/testing/selftests/kvm/lib/x86/sev.c | 78
APIC updates done by guest are propagated
to host for unaccelerated APIC registers. For accelerated APIC
registers, updates are not propagated to host.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/Makefile.kvm | 1 +
.../testing/selftests/kvm/include/x86/savic.h
Extend SAVIC test include MSI injection from host.
Test scenarios where MSI vector is not allowed by
guest in ALLOWED_IRR and when it is allowed.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/x86/savic_test.c | 49
1 file changed, 49 insertions(+)
diff
Extend SAVIC test with various NMI tests:
- Test NMI injection failure when AllowedNMI is not set
by guest.
- Test NMI injection when 2 NMIs are pending.
- Test ICR based cross-VCPU NMI for fixed-phys, fixed-logical,
broadcast-all and broadcast-exclself modes.
Signed-off-by: Neeraj Upadhyay
Extend SAVIC test to include various cross-vCPU IPI modes -
fixed dest, fixed-logical, broadcast-all, broadcast excluding
self.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/x86/savic_test.c | 305 ++-
1 file changed, 299 insertions(+), 6 deletions(-)
diff
Extend Secure AVIC tests to test edge and level
ioapic based interrupt flow. In addition, test
RTC_GSI IOAPIC line which has special casing
in KVM. Add new interfaces to read and write to
IOAPIC redirect tables.
Signed-off-by: Neeraj Upadhyay
---
.../testing/selftests/kvm/include/kvm_util.h
-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/x86/savic_test.c | 57 +++-
1 file changed, 55 insertions(+), 2 deletions(-)
diff --git a/tools/testing/selftests/kvm/x86/savic_test.c
b/tools/testing/selftests/kvm/x86/savic_test.c
index 8cba7a81bce2..5c52254f7b1c 100644
--- a
Extend SAVIC test to verify APIC MSR accesses in SAVIC enabled
mode. Verify the behavior of reads and writes using rdmsr/wrmsr
for various APIC registers. In addition, test whether wrmsr
based writes are propagated to guest backing page.
Signed-off-by: Neeraj Upadhyay
---
.../testing/selftests
Test cross-vCPU IPI for Secure AVIC guests using xapic_ipi_test.
Add new "SAVIC" apic mode to the test for this.
Signed-off-by: Neeraj Upadhyay
---
tools/arch/x86/include/asm/msr-index.h| 4 +-
.../selftests/kvm/include/x86/processor.h | 1 +
.../selftests/kvm/x86/xapic_
Currently, ghcb_alloc() always returns first entry. Fix
it to return an unused entry.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/lib/x86/sev.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/tools/testing/selftests/kvm/lib/x86/sev.c
b/tools/testing
Add GHCB call to register Secure AVIC guest APIC backing page
GPA with the hyperversior. This call ensures that guest APIC
backing page is pinned in NPT while vCPU is running.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/include/x86/sev.h | 1 +
tools/testing/selftests/kvm
Add provision to pass custom args to kvm_arch_vm_post_create().
This will be used to pass sev init args (vmsa features) for SEV VMs.
Signed-off-by: Neeraj Upadhyay
---
.../testing/selftests/kvm/include/kvm_util.h | 9 +++-
tools/testing/selftests/kvm/include/x86/sev.h | 3 ++
tools/testing
Add #VC exception handling on rdmsr/wrmsr accesses for SEV-ES
guests. In addition, add PV interface for direct msr read/write
from SEV-ES guests without going through #VC exception path.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/include/x86/sev.h | 2 +
tools/testing
Christopherson
Cc: Carlos Bilbao
Cc: Tom Lendacky
Cc: Michael Roth
Cc: k...@vger.kernel.org
Cc: linux-kselft...@vger.kernel.org
Signed-off-by: Peter Gonda
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/include/kvm_util.h | 2 ++
tools/testing/selftests/kvm/lib/kvm_util.c | 16
writes are supported.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/lib/x86/savic.c | 112
1 file changed, 112 insertions(+)
diff --git a/tools/testing/selftests/kvm/lib/x86/savic.c
b/tools/testing/selftests/kvm/lib/x86/savic.c
index 141d31637e51..8259f7521e73
Add #VC exception handling support for unaccelerated msrs
reads/writes for Secure AVIC guests.
Signed-off-by: Neeraj Upadhyay
---
.../testing/selftests/kvm/include/x86/apic.h | 1 +
.../testing/selftests/kvm/include/x86/savic.h | 1 +
tools/testing/selftests/kvm/lib/x86/savic.c | 145
Add Secure AVIC lib which provides apis to enable
Secure AVIC for a vCPU. In addition, add guest APIC
backing page initialization support and helper
functions to access APIC regs from guest APIC backing
page and from hv.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm
Add support to test SEV VMs - SEV, SEV-ES, SEV-SNP
in both xapic and x2apic modes. Convert the stats page
to a shared page so that it is accesible from host.
Signed-off-by: Neeraj Upadhyay
---
.../testing/selftests/kvm/include/kvm_util.h | 1 +
tools/testing/selftests/kvm/lib/kvm_util.c
Add support for testing x2apic mode in xapic_ipi_test. This
allows extending the test in future to support VMs which
only work in x2apic mode such as Secure AVIC enabled VMs.
Signed-off-by: Neeraj Upadhyay
---
.../selftests/kvm/x86/xapic_ipi_test.c| 65 +++
1 file
Now with xapic/x2apic acceses being supported for SEV-ES and
SNP guests, add support for testing these VMs in xapic_state_test.
Signed-off-by: Neeraj Upadhyay
---
.../selftests/kvm/x86/xapic_state_test.c | 117 --
1 file changed, 109 insertions(+), 8 deletions(-)
diff
Certain xapic MMIO reads and writes get compiled into movabs
instruction which uses rax as the register containing data and
8-byte address encoded as part of the instruction. Add support
to decode these instructions.
Signed-off-by: Neeraj Upadhyay
---
.../testing/selftests/kvm/lib/x86/insn
Add MMIO VC exception handling support to allow xapic mmio access
for SEV-ES guests. In addition, add a PV interface for xapic MMIO
guest accesses from outside of VC exception handler context.
Signed-off-by: Neeraj Upadhyay
---
.../selftests/kvm/include/x86/ex_regs.h | 2 +-
tools
Update insn-eval.c to prototype instruction decoding for MMIO
VC exception exit.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/Makefile.kvm | 12 +
.../selftests/kvm/include/x86/ex_regs.h | 21 ++
.../selftests/kvm/include/x86/insn-eval.h | 48
-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/.gitignore|3 +-
.../testing/selftests/kvm/lib/x86/insn-eval.c | 1670 +
2 files changed, 1672 insertions(+), 1 deletion(-)
create mode 100644 tools/testing/selftests/kvm/lib/x86/insn-eval.c
diff --git a/tools/testing
Skip vm_is_gpa_protected() call for APIC MMIO address in __virt_pg_map().
Without this change, the virt_pg_map() fails with below error for
APIC MMIO address.
No vm physical memory at 0xfee0
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/lib/x86/processor.c | 6
Make GHCB entry page size aligned. Without this change
GHCB GPA registration gets incorrectly interpreted in
host as a GHCB MSR protocol request.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/lib/x86/sev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a
: Neeraj Upadhyay
---
tools/testing/selftests/kvm/Makefile.kvm | 2 +-
tools/testing/selftests/kvm/include/x86/svm.h | 106 ++
2 files changed, 107 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/Makefile.kvm
b/tools/testing/selftests/kvm/Makefile.kvm
index
estination
shorthands for Secure AVIC enabled VM.
- Patch 30 adds Hypervisor NMI injection and cross-vCPU ICR based NMI
for Secure AVIC enabled VM.
- Patch 31 adds MSI injection test for Secure AVIC enabled VM.
Neeraj Upadhyay (25):
KVM: selftests: Fix ghcb_entry returned in ghcb_alloc()
KVM:
VC exception has an associated error code. Update the IDT
handler for it.
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/lib/x86/handlers.S | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/tools/testing/selftests/kvm/lib/x86/handlers.S
b/tools/testing
protocol.
Cc: Vishal Annapurve
Cc: Ackerley Tng
Cc: Paolo Bonzini
Cc: Claudio Imbrenda
Cc: Sean Christopherson
Cc: Carlos Bilbao
Cc: Tom Lendacky
Cc: Michael Roth
Cc: k...@vger.kernel.org
Cc: linux-kselft...@vger.kernel.org
Signed-off-by: Peter Gonda
Signed-off-by: Neeraj Upadhyay
---
tools
...@vger.kernel.org
Signed-off-by: Peter Gonda
Signed-off-by: Neeraj Upadhyay
---
tools/testing/selftests/kvm/include/kvm_util.h | 1 +
tools/testing/selftests/kvm/lib/kvm_util.c | 6 ++
2 files changed, 7 insertions(+)
diff --git a/tools/testing/selftests/kvm/include/kvm_util.h
b/tools/testing
From: Peter Gonda
Add helper functions for guest code to check the status of SEV and
SEV-ES.
Cc: Paolo Bonzini
Cc: Claudio Imbrenda
Cc: Sean Christopherson
Cc: Carlos Bilbao
Cc: Tom Lendacky
Cc: Michael Roth
Signed-off-by: Peter Gonda
Signed-off-by: Neeraj Upadhyay
---
tools/testing
tall diagnosis information")
> Reported-by: kernel test robot
> Closes:
> https://lore.kernel.org/oe-kbuild-all/202501090842.sfi6qpgs-...@intel.com/
> Signed-off-by: Yongliang Gao
Please move these tags above "---" of "Changes from v1:" section.
Reviewed-by: Neer
ON_ONCE() splat which is in brackets.
>
> Reviewed-by: Paul E. McKenney
> Signed-off-by: Uladzislau Rezki (Sony)
> ---
Reviewed-by: Neeraj Upadhyay
- Neeraj
Reviewed-by: Paul E. McKenney
> Reported-by: Dan Carpenter
> Closes: https://lore.kernel.org/rcu/ZxfTrHuEGtgnOYWp@pc636/T/
> Fixes: 084e04fff160 ("rcuscale: Add laziness and kfree tests")
> Signed-off-by: Uladzislau Rezki (Sony)
> ---
Reviewed-by: Neeraj Upadhyay
- Neeraj
On 11/13/2024 3:07 AM, Frederic Weisbecker wrote:
> Le Mon, Nov 11, 2024 at 01:07:16PM +0530, Neeraj Upadhyay a écrit :
>>
>>> diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
>>> index 16865475120b..2605dd234a13 100644
>>> --- a/kernel/
>>>
>>> static int srcu_torture_read_lock(void)
>>> {
>>> - if (cur_ops == &srcud_ops)
>>> - return srcu_read_lock_nmisafe(srcu_ctlp);
>>> - else
>>> - return srcu_read_lock(srcu_ctlp);
>>> + int idx;
>>> + int ret = 0;
>>> +
>>> + if ((reader_flavor & 0x1) || !(
On 10/15/2024 9:41 PM, Paul E. McKenney wrote:
> This commit adds an rcutorture.reader_flavor parameter whose bits
> correspond to reader flavors. For example, SRCU's readers are 0x1 for
> normal and 0x2 for NMI-safe.
>
> Signed-off-by: Paul E. McKenney
> Cc: Alexei Starovoitov
> Cc: Andrii Nak
t-weight SRCU scenario.
>
> 14. Add srcu_read_lock_lite() support using "srcu-lite".
>
> 15. Improve srcu_read_lock_lite() kernel-doc comment.
>
> Changes since v2:
>
> o Apply acked-by tag.
>
> o Split commit per Neeraj Upadhyay feedback.
>
;sda);
> +
> + if (likely(READ_ONCE(sdp->srcu_reader_flavor) & SRCU_READ_FLAVOR_LITE))
> + return;
> +
> + // Note that the cmpxchg() in srcu_check_read_flavor() is fully ordered.
Nit: s/srcu_check_read_flavor/__srcu_check_read_flavor
tion that test the
> SRCU_READ_FLAVOR_LITE bit in the resulting mask.
>
> Note that the srcu_readers_unlock_idx() function is already scanning all
> the CPUs to sum up the ->srcu_unlock_count[] fields and that this is on
> the grace-period slow path, hence no concerns about the sm
ommit therefore switches to __srcu_read_unlock_lite().
>
> Reported-by: Neeraj Upadhyay
> Closes:
> https://lore.kernel.org/all/d07e8f4a-d5ff-4c8e-8e61-50db285c5...@amd.com/
> Fixes: c0f08d6b5a61 ("srcu: Add srcu_read_lock_lite() and
> srcu_read_unlock_lite()")
> S
I am trying to understand the (unlikely) case where synchronize_srcu() is
done before any
srcu reader lock/unlock lite call is done. Can new SRCU readers fail to
observe the
updates?
>>>
>>> If a SRCU reader fail to observe the index flip, then isn't it the case
>>> t
| 6 +++
> 5 files changed, 56 insertions(+), 27 deletions(-)
>
> Thanks.
Reviewed-by: Neeraj Upadhyay
- Neeraj
ed RCU barrier on deoffloading
>
> kernel/rcu/rcu_segcblist.h | 1 -
> kernel/rcu/tree_nocb.h | 13 -
> 2 files changed, 12 insertions(+), 2 deletions(-)
>
> Thanks.
>
Reviewed-by: Neeraj Upadhyay
- Neeraj
++
> 6 files changed, 27 insertions(+), 33 deletions(-)
>
For this series:
Reviewed-by: Neeraj Upadhyay
- Neeraj
> Thanks.
On 11/11/2024 8:56 PM, Paul E. McKenney wrote:
> On Mon, Nov 11, 2024 at 06:24:58PM +0530, Neeraj Upadhyay wrote:
>>
>>>
>>> /*
>>> - * Returns approximate total of the readers' ->srcu_lock_count[] values
>>> - * for the rank of per-CPU co
>
> /*
> - * Returns approximate total of the readers' ->srcu_lock_count[] values
> - * for the rank of per-CPU counters specified by idx.
> + * Computes approximate total of the readers' ->srcu_lock_count[] values
> + * for the rank of per-CPU counters specified by idx, and returns true if
>
> +/**
> + * srcu_read_unlock_lite - unregister a old reader from an SRCU-protected
> structure.
> + * @ssp: srcu_struct in which to unregister the old reader.
> + * @idx: return value from corresponding srcu_read_lock().
> + *
> + * Exit a light-weight SRCU read-side critical section.
> + */
>
> diff --git a/kernel/rcu/rcuscale.c b/kernel/rcu/rcuscale.c
> index 6d37596deb1f..de7d511e6be4 100644
> --- a/kernel/rcu/rcuscale.c
> +++ b/kernel/rcu/rcuscale.c
> @@ -890,13 +890,13 @@ kfree_scale_init(void)
> if (WARN_ON_ONCE(jiffies_at_lazy_cb - jif_start < 2 * HZ)) {
>
> diff --git a/kernel/rcu/tree_nocb.h b/kernel/rcu/tree_nocb.h
> index 16865475120b..2605dd234a13 100644
> --- a/kernel/rcu/tree_nocb.h
> +++ b/kernel/rcu/tree_nocb.h
> @@ -891,7 +891,18 @@ static void nocb_cb_wait(struct rcu_data *rdp)
> swait_event_interruptible_exclusive(rdp->nocb_cb_wq,
On 10/15/2024 5:59 AM, Paul E. McKenney wrote:
> On Mon, Oct 14, 2024 at 09:49:52AM -0700, Paul E. McKenney wrote:
>> On Mon, Oct 14, 2024 at 02:45:50PM +0530, Neeraj Upadhyay wrote:
>>> On 10/9/2024 11:37 PM, Paul E. McKenney wrote:
>>>> This commit changes a fe
On 10/14/2024 10:21 PM, Paul E. McKenney wrote:
> On Mon, Oct 14, 2024 at 02:42:33PM +0530, Neeraj Upadhyay wrote:
>> On 10/9/2024 11:37 PM, Paul E. McKenney wrote:
>>> Currently, there are only two flavors of readers, normal and NMI-safe.
>>> Very straightforward sta
On 10/14/2024 10:22 PM, Paul E. McKenney wrote:
> On Mon, Oct 14, 2024 at 02:40:35PM +0530, Neeraj Upadhyay wrote:
>> On 10/9/2024 11:37 PM, Paul E. McKenney wrote:
>>> Currently, there are only two flavors of readers, normal and NMI-safe.
>>> A number of fields, f
On 10/9/2024 11:37 PM, Paul E. McKenney wrote:
> This commit changes a few "cpuc" variables to "sdp" to align wiht usage
> elsewhere.
>
s/wiht/with/
This commit is doing a lot more than renaming "cpuc".
- Neeraj
> Signed-off-by: Paul E. McKenney
> Cc: Alexei Starovoitov
> Cc: Andrii Nakryi
On 10/9/2024 11:37 PM, Paul E. McKenney wrote:
> Currently, there are only two flavors of readers, normal and NMI-safe.
> Very straightforward state updates suffice to check for erroneous
> mixing of reader flavors on a given srcu_struct structure. This commit
> upgrades the checking in preparatio
On 10/9/2024 11:37 PM, Paul E. McKenney wrote:
> Currently, there are only two flavors of readers, normal and NMI-safe.
> A number of fields, functions, and types reflect this restriction.
> This renaming-only commit prepares for the addition of light-weight
> (as in memory-barrier-free) readers.
Alexei Starovoitov
> Cc: Andrii Nakryiko
> Cc: Peter Zijlstra
> Cc: Kent Overstreet
> Cc:
> ---
Reviewed-by: Neeraj Upadhyay
- Neeraj
of srcu_might_be_idle() to
> srcu_should_expedite(), thus moving from what it currently does to why
> it does it, this latter being more future-proof.
>
> Signed-off-by: Paul E. McKenney
> Cc: Alexei Starovoitov
> Cc: Andrii Nakryiko
> Cc: Peter Zijlstra
> Cc: Kent Overstreet
> Cc:
> ---
Reviewed-by: Neeraj Upadhyay
- Neeraj
Hi Linus,
The following changes since commit 8cf0b93919e13d1e8d4466eb4080a4c4d9d66d7b:
Linux 6.12-rc2 (2024-10-06 15:32:27 -0700)
are available in the Git repository at:
git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git
tags/rcu.fixes.6.12-rc3
for you to fetch changes up to f734
Signed-off-by: Paul E. McKenney
Cc: Peter Zijlstra
Signed-off-by: Neeraj Upadhyay
---
kernel/rcu/tasks.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h
index 72dc0d0a4a8f..ef9de6b91a3d 100644
--- a/kernel/rcu/tasks.h
+++ b/kernel/r
From: Neeraj Upadhyay
rcu_task_enter() and rcu_task_exit() are not called on NMI
entry and exit. So, Tasks-RCU-Rude grace period wait is required to
ensure that NMI handlers have entered/exited into Tasks-RCU eqs.
For architectures which do not require Tasks-RCU-Rude (as the code
sections where
From: Neeraj Upadhyay
Currently, idle tasks are ignored by RCU-tasks. Change this to
start paying attention to idle tasks except in deep-idle functions
where RCU is not watching. With this, for architectures where
kernel entry/exit and deep-idle functions have been properly tagged
noinstr, Tasks
From: Neeraj Upadhyay
Use RCU watching state of a CPU to check whether RCU-tasks GP
need to wait for idle injection task on that CPU. Idle injection
tasks which are in deep-idle states where RCU is not watching or
which have transitioned to/from deep-idle state do not block
RCU-tasks grace
From: Neeraj Upadhyay
Use RCU watching state of a CPU to check whether RCU-tasks GP
need to wait for idle task on that CPU. Idle tasks which are
in deep-idle states where RCU is not watching or which have
transitioned to/from deep-idle state do not block RCU-tasks
grace period.
Signed-off-by
From: Neeraj Upadhyay
As idle tasks cannot be non-voluntary preempted, idle tasks which
are not running on CPU are not in RCU-tasks read side critical
section. So, remove them for holdout tasks for RCU-tasks.
Signed-off-by: Neeraj Upadhyay
---
kernel/rcu/tasks.h | 9 +
1 file changed
From: Neeraj Upadhyay
rcu_idle_task_is_holdout() is called in rcu_tasks_kthread() context.
As idle tasks cannot be non-voluntary preempted, non-running idle tasks
are not in RCU-tasks critical section. So, idle task is not a RCU-tasks
holdout task on !SMP (which also covers TINY_RCU).
Signed
From: Neeraj Upadhyay
Move checks for an idle task being a holdout task for RCU-tasks
to a separate function - rcu_idle_task_is_holdout(). This function
will be used in subsequent commits to add additional checks for
idle task. No functional change intended.
Suggested-by: Frederic Weisbecker
From: Neeraj Upadhyay
rcu_watching_snap_in_eqs() and rcu_watching_snap_stopped_since()
will be used in subsequent commits by RCU-tasks to check rcu_watching
state of idle tasks. So, make these functions global.
Signed-off-by: Neeraj Upadhyay
---
kernel/rcu/rcu.h | 4
kernel/rcu/tree.c
From: Neeraj Upadhyay
In preparation of making rcu_watching_snap_stopped_since() available
for RCU code outside of tree.c, change the rdp argument to cpu number.
Signed-off-by: Neeraj Upadhyay
---
kernel/rcu/tree.c | 14 +++---
kernel/rcu/tree_exp.h | 2 +-
2 files changed, 8
From: Neeraj Upadhyay
Architectures for which all deep-idle and entry-exit functions are
marked noinstr, synchronize_rcu_tasks_rude() is not required. However,
disabling synchronize_rcu_tasks_rude() for such architectures require
RCU-tasks to pay attention to idle tasks until they enter the
On 10/2/2024 8:30 PM, Frederic Weisbecker wrote:
> Le Wed, Oct 02, 2024 at 04:57:38PM +0200, Frederic Weisbecker a écrit :
>> Callbacks enqueued after rcutree_report_cpu_dead() fall into RCU barrier
>> blind spot. Report any potential misuse.
>>
>> Reported-by: Paul E. McKenney
>> Signed-off-by
On 9/19/2024 12:16 PM, Linus Torvalds wrote:
> On Thu, 19 Sept 2024 at 00:44, Neeraj Upadhyay
> wrote:
>>
>> While we were working on this problem, this refcount scalability issue got
>> resolved recently with conditional ref acquisition [3] (however, there are
&
On 9/18/2024 12:48 PM, Linus Torvalds wrote:
> On Tue, 17 Sept 2024 at 16:34, Boqun Feng wrote:
>>
>> This series introduces hazard pointers [1] to kernel space. A TL;DR
>> description of hazard pointers is "a scalable refcounting mechanim
>> with RCU-like API". More information can be found at [2
Cache Domains apparmor=on (percpuref)
scaling eff (%)
8C16T 1 100%
16C32T 2 96%
24C48T 3 94%
48C96T 6 93%
96C192T12 90%
Signed-off-b
.
- Displacement of aa_label struct members to different cacheline, as
percpu ref takes 2 pointers space.
- Moving of the atomic counter outside of the cacheline of the aa_label
struct.
Signed-off-by: Neeraj Upadhyay
---
security/apparmor/include/label.h | 16
security
Extend the test to exercise runtime switching from managed
mode to other reinitable active modes.
Signed-off-by: Neeraj Upadhyay
---
lib/percpu-refcount-torture.c | 41 +--
lib/percpu-refcount.c | 12 +-
2 files changed, 50 insertions(+), 3
de using percpu_ref_switch_to_atomic().
Signed-off-by: Neeraj Upadhyay
---
include/linux/percpu-refcount.h | 3 +-
lib/percpu-refcount.c | 248 +++-
2 files changed, 88 insertions(+), 163 deletions(-)
diff --git a/include/linux/percpu-refcount.h b/include/linux/percpu-refcount
Add torture test to verify percpu managed mode operations,
verifying that a percpu ref does not have non-zero count when
all users have dropped their reference and that there is no early
release of the ref while users hold references to it.
Signed-off-by: Neeraj Upadhyay
---
.../admin-guide
ReInit D(RI/M) - Dead with ReInit and Managed
PerCPU Ref Ops:
KLL - Kill REI - Reinit RES - Resurrect
Once a percpu ref is switched to managed mode, it cannot be switched to
any other active mode. On reinit/resurrect, managed ref is reinitialized
in managed mode.
Signed-off-by: Neeraj Upadh
ion.
4. Updates to torture test to test runtime mode switches from managed
to unmanaged modes.
5. Switch Label refcount management to percpu ref in atomic mode.
6. Switch Label refcount management to managed mode.
Highly appreciate any feedback/suggestions on the design approach.
[1]
https://lo
_RCU_CORE
rcu/nocb: Remove SEGCBLIST_KTHREAD_CB
rcu/nocb: Simplify (de-)offloading state machine
rcu/nocb: Fix RT throttling hrtimer armed from offline CPU
rcu/nocb: Conditionally wake up rcuo if not already waiting on GP
rcu/nocb: Remove superfluous memory bar
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: 47fcbc8dd62f15dc75916225ebacdc3bca9c12b2
Gitweb:
https://git.kernel.org/tip/47fcbc8dd62f15dc75916225ebacdc3bca9c12b2
Author:Neeraj Upadhyay
AuthorDate:Mon, 11 Jan 2021 17:15:58 +05:30
e entry.
This commit fixes this bug by resetting rdp->nocb_defer_wakeup everytime
we delete the ->nocb_timer.
Fixes: d1b222c6be1f (rcu/nocb: Add bypass callback queueing)
Cc: Stable
Cc: Josh Triplett
Cc: Lai Jiangshan
Cc: Joel Fernandes
On 2/17/2021 10:36 PM, Will Deacon wrote:
On Wed, Feb 17, 2021 at 10:14:11PM +0530, Neeraj Upadhyay wrote:
Add the MIDR part number info for the Arm Cortex-A78.
Signed-off-by: Neeraj Upadhyay
---
arch/arm64/include/asm/cputype.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch
Add the MIDR part number info for the Arm Cortex-A78.
Signed-off-by: Neeraj Upadhyay
---
arch/arm64/include/asm/cputype.h | 2 ++
1 file changed, 2 insertions(+)
diff --git a/arch/arm64/include/asm/cputype.h b/arch/arm64/include/asm/cputype.h
index ef5b040..3aced88 100644
--- a/arch/arm64
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: 683954e55c981467bfd4688417e914bafc40959f
Gitweb:
https://git.kernel.org/tip/683954e55c981467bfd4688417e914bafc40959f
Author:Neeraj Upadhyay
AuthorDate:Mon, 16 Nov 2020 21:36:00 +05:30
On 1/12/2021 11:01 PM, Paul E. McKenney wrote:
On Mon, Jan 11, 2021 at 05:15:58PM +0530, Neeraj Upadhyay wrote:
Correctly trace whether the outgoing cpu blocks current gp in
rcutree_dying_cpu().
Signed-off-by: Neeraj Upadhyay
Good catch, queued, thank you! Please see below for my usual
Correctly trace whether the outgoing cpu blocks current gp in
rcutree_dying_cpu().
Signed-off-by: Neeraj Upadhyay
---
kernel/rcu/tree.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 097990a..1f4bff4 100644
--- a/kernel/rcu/tree.c
Trace cbs which are accelerated without rnp lock help in
rcu_accelerate_cbs_unlocked().
Signed-off-by: Neeraj Upadhyay
---
kernel/rcu/tree.c | 21 ++---
1 file changed, 14 insertions(+), 7 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 338b817..097990a
Fix rcu_accelerate_cbs() traces to only trace when cbs are
accelerated in current call.
Signed-off-by: Neeraj Upadhyay
---
kernel/rcu/tree.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 804e543..338b817 100644
--- a/kernel
for these smp_call_function() callbacks running from idle loop.
However, this commit missed updating a preexisting underflow check
of dynticks_nmi_nesting, which checks for a non zero positive value.
Fix this warning and while at it, read the counter only once.
Signed-off-by: Neeraj Upadhyay
---
Hi,
I wa
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: a3941517fcd6625adc540aef5ec3f717c8fa71e8
Gitweb:
https://git.kernel.org/tip/a3941517fcd6625adc540aef5ec3f717c8fa71e8
Author:Neeraj Upadhyay
AuthorDate:Thu, 24 Sep 2020 12:04:10 +05:30
The following commit has been merged into the core/rcu branch of tip:
Commit-ID: ed73860cecc3ec12aa50a6dcfb4900e5b4ae9507
Gitweb:
https://git.kernel.org/tip/ed73860cecc3ec12aa50a6dcfb4900e5b4ae9507
Author:Neeraj Upadhyay
AuthorDate:Wed, 23 Sep 2020 12:59:33 +05:30
On 11/28/2020 7:46 AM, Paul E. McKenney wrote:
On Wed, Nov 25, 2020 at 10:03:26AM +0530, Neeraj Upadhyay wrote:
On 11/24/2020 10:48 AM, Neeraj Upadhyay wrote:
On 11/24/2020 1:25 AM, Paul E. McKenney wrote:
On Mon, Nov 23, 2020 at 10:01:13AM +0530, Neeraj Upadhyay wrote:
On 11/21/2020
547.gf3365...@moria.home.lan/
Reported-by: Kent Overstreet
Signed-off-by: Paul E. McKenney
---
Reviewed-by: Neeraj Upadhyay
Thanks
Neeraj
Documentation/RCU/Design/Requirements/Requirements.rst | 18 ++
1 file changed, 18 insertions(+)
diff --git a/Documentation/
Overstreet
[ paulmck: Add EXPORT_SYMBOL_GPL() per kernel test robot feedback. ]
[ paulmck: Apply feedback from Neeraj Upadhyay. ]
Link: https://lore.kernel.org/lkml/20201117004017.GA7444@paulmck-ThinkPad-P72/
Signed-off-by: Paul E. McKenney
---
For version in -rcu dev
Reviewed-by: Neeraj Upadhyay
On 11/25/2020 1:00 AM, Paul E. McKenney wrote:
On Tue, Nov 24, 2020 at 10:44:24AM +0530, Neeraj Upadhyay wrote:
On 11/24/2020 2:42 AM, Paul E. McKenney wrote:
On Mon, Nov 23, 2020 at 10:13:13AM +0530, Neeraj Upadhyay wrote:
On 11/21/2020 6:29 AM, paul...@kernel.org wrote:
From: "
On 11/24/2020 10:48 AM, Neeraj Upadhyay wrote:
On 11/24/2020 1:25 AM, Paul E. McKenney wrote:
On Mon, Nov 23, 2020 at 10:01:13AM +0530, Neeraj Upadhyay wrote:
On 11/21/2020 6:29 AM, paul...@kernel.org wrote:
From: "Paul E. McKenney"
There is a need for a polling interfac
Thanks Marc, Vladimir, Mark, Sudeep for your inputs!
Thanks
Neeraj
On 11/20/2020 3:43 PM, Mark Rutland wrote:
On Fri, Nov 20, 2020 at 09:09:00AM +, Vladimir Murzin wrote:
On 11/20/20 8:56 AM, Marc Zyngier wrote:
On 2020-11-20 04:30, Neeraj Upadhyay wrote:
Hi,
For ARM cortex A76, A77
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