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M . Jones" , Ilya Dryomov , Peter Lieven , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , =?UTF-8?q?Alex=20Benn=C3=A9e?= , Fam Zheng , Ronnie Sahlberg Subject: [PATCH 07/16] nvme: Kick and check completions in BDS context Date: Tue, 28 Oct 2025 17:33:33 +0100 Message-ID: <20251028163343.116249-8-hreitz@redhat.com> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251028163343.116249-1-hreitz@redhat.com> References: <20251028163343.116249-1-hreitz@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=hreitz@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1761669478018154100 nvme_process_completion() must run in the main BDS context, so schedule a BH for requests that aren=E2=80=99t there. The context in which we kick does not matter, but let=E2=80=99s just keep k= ick and process_completion together for simplicity=E2=80=99s sake. (For what it=E2=80=99s worth, a quick fio bandwidth test indicates that on = my test hardware, if anything, this may be a bit better than kicking immediately before scheduling a pure nvme_process_completion() BH. But I wouldn=E2=80=99t take more from those results than that it doesn=E2=80=99= t really seem to matter either way.) Cc: qemu-stable@nongnu.org Signed-off-by: Hanna Czenczek --- block/nvme.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/block/nvme.c b/block/nvme.c index 8df53ee4ca..7ed5f570bc 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -481,7 +481,7 @@ static void nvme_trace_command(const NvmeCmd *cmd) } } =20 -static void nvme_deferred_fn(void *opaque) +static void nvme_kick_and_check_completions(void *opaque) { NVMeQueuePair *q =3D opaque; =20 @@ -490,6 +490,18 @@ static void nvme_deferred_fn(void *opaque) nvme_process_completion(q); } =20 +static void nvme_deferred_fn(void *opaque) +{ + NVMeQueuePair *q =3D opaque; + + if (qemu_get_current_aio_context() =3D=3D q->s->aio_context) { + nvme_kick_and_check_completions(q); + } else { + aio_bh_schedule_oneshot(q->s->aio_context, + nvme_kick_and_check_completions, q); + } +} + static void nvme_submit_command(NVMeQueuePair *q, NVMeRequest *req, NvmeCmd *cmd, BlockCompletionFunc cb, void *opaque) --=20 2.51.0