From: K Prateek Nayak <kprateek.nayak@amd.com>
To: Sean Christopherson <seanjc@google.com>,
"K. Y. Srinivasan" <kys@microsoft.com>,
Haiyang Zhang <haiyangz@microsoft.com>,
Wei Liu <wei.liu@kernel.org>, Dexuan Cui <decui@microsoft.com>,
Juergen Gross <jgross@suse.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Shuah Khan <shuah@kernel.org>, Marc Zyngier <maz@kernel.org>,
Oliver Upton <oliver.upton@linux.dev>
Cc: linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org,
xen-devel@lists.xenproject.org, kvm@vger.kernel.org,
linux-kselftest@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
David Matlack <dmatlack@google.com>
Subject: Re: [PATCH v3 08/13] sched/wait: Add a waitqueue helper for fully exclusive priority waiters
Date: Fri, 30 May 2025 14:15:08 +0530 [thread overview]
Message-ID: <fbe816ac-8fe2-430e-aa68-15737da98ec5@amd.com> (raw)
In-Reply-To: <20250522235223.3178519-9-seanjc@google.com>
Hello Sean,
On 5/23/2025 5:22 AM, Sean Christopherson wrote:
> Add a waitqueue helper to add a priority waiter that requires exclusive
> wakeups, i.e. that requires that it be the _only_ priority waiter. The
> API will be used by KVM to ensure that at most one of KVM's irqfds is
> bound to a single eventfd (across the entire kernel).
>
> Open code the helper instead of using __add_wait_queue() so that the
> common path doesn't need to "handle" impossible failures.
>
> Cc: K Prateek Nayak <kprateek.nayak@amd.com>
Feel free to include:
Reviewed-by: K Prateek Nayak <kprateek.nayak@amd.com>
--
Thanks and Regards,
Prateek
> Signed-off-by: Sean Christopherson <seanjc@google.com>
> ---
> include/linux/wait.h | 2 ++
> kernel/sched/wait.c | 18 ++++++++++++++++++
> 2 files changed, 20 insertions(+)
> [..snip..]
next prev parent reply other threads:[~2025-05-30 8:47 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-05-22 23:52 [PATCH v3 00/13] KVM: Make irqfd registration globally unique Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 01/13] KVM: Use a local struct to do the initial vfs_poll() on an irqfd Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 02/13] KVM: Acquire SCRU lock outside of irqfds.lock during assignment Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 03/13] KVM: Initialize irqfd waitqueue callback when adding to the queue Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 04/13] KVM: Add irqfd to KVM's list via the vfs_poll() callback Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 05/13] KVM: Add irqfd to eventfd's waitqueue while holding irqfds.lock Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 06/13] sched/wait: Drop WQ_FLAG_EXCLUSIVE from add_wait_queue_priority() Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 07/13] xen: privcmd: Don't mark eventfd waiter as EXCLUSIVE Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 08/13] sched/wait: Add a waitqueue helper for fully exclusive priority waiters Sean Christopherson
2025-05-30 8:45 ` K Prateek Nayak [this message]
2025-05-22 23:52 ` [PATCH v3 09/13] KVM: Disallow binding multiple irqfds to an eventfd with a priority waiter Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 10/13] KVM: Drop sanity check that per-VM list of irqfds is unique Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 11/13] KVM: selftests: Assert that eventfd() succeeds in Xen shinfo test Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 12/13] KVM: selftests: Add utilities to create eventfds and do KVM_IRQFD Sean Christopherson
2025-05-22 23:52 ` [PATCH v3 13/13] KVM: selftests: Add a KVM_IRQFD test to verify uniqueness requirements Sean Christopherson
2025-05-23 7:23 ` Sairaj Kodilkar
2025-05-23 14:33 ` Sean Christopherson
2025-05-26 3:36 ` Sairaj Kodilkar
2025-05-23 11:14 ` [PATCH v3 00/13] KVM: Make irqfd registration globally unique Peter Zijlstra
2025-05-30 8:49 ` K Prateek Nayak
2025-06-24 19:38 ` Sean Christopherson
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