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Fri, 21 Mar 2025 12:37:04 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEowWUXagoZIoweCvQRfmtjqA/SNMQoj6gAyfhHZS9vDb6q+jhLEaKJ62zuuxrIuV9JfDVSgQ== X-Received: by 2002:a05:6a00:398d:b0:736:b402:533a with SMTP id d2e1a72fcca58-7390593b622mr6060440b3a.1.1742585823983; Fri, 21 Mar 2025 12:37:03 -0700 (PDT) Received: from redhat.com ([195.133.138.172]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-73905fd5c72sm2500514b3a.59.2025.03.21.12.37.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 21 Mar 2025 12:37:03 -0700 (PDT) Date: Fri, 21 Mar 2025 15:36:58 -0400 From: "Michael S. Tsirkin" To: Cindy Lu Cc: jasowang@redhat.com, michael.christie@oracle.com, sgarzare@redhat.com, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org Subject: Re: [PATCH v7 0/8] vhost: Add support of kthread API Message-ID: <20250321153611-mutt-send-email-mst@kernel.org> References: <20250302143259.1221569-1-lulu@redhat.com> Precedence: bulk X-Mailing-List: virtualization@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 In-Reply-To: <20250302143259.1221569-1-lulu@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: vZSiOsy9HcL2tC5cKqSgqndn72GcrK-JDs-5l-INX6g_1742585825 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Sun, Mar 02, 2025 at 10:32:02PM +0800, Cindy Lu wrote: > In commit 6e890c5d5021 ("vhost: use vhost_tasks for worker threads"), > the vhost now uses vhost_task and operates as a child of the > owner thread. This aligns with containerization principles. > However, this change has caused confusion for some legacy > userspace applications. Therefore, we are reintroducing > support for the kthread API. > > In this series, a new UAPI is implemented to allow > userspace applications to configure their thread mode. This seems to be on top of an old tree. Can you rebase pls? > Changelog v2: > 1. Change the module_param's name to enforce_inherit_owner, and the default value is true. > 2. Change the UAPI's name to VHOST_SET_INHERIT_FROM_OWNER. > > Changelog v3: > 1. Change the module_param's name to inherit_owner_default, and the default value is true. > 2. Add a structure for task function; the worker will select a different mode based on the value inherit_owner. > 3. device will have their own inherit_owner in struct vhost_dev > 4. Address other comments > > Changelog v4: > 1. remove the module_param, only keep the UAPI > 2. remove the structure for task function; change to use the function pointer in vhost_worker > 3. fix the issue in vhost_worker_create and vhost_dev_ioctl > 4. Address other comments > > Changelog v5: > 1. Change wakeup and stop function pointers in struct vhost_worker to void. > 2. merging patches 4, 5, 6 in a single patch > 3. Fix spelling issues and address other comments. > > Changelog v6: > 1. move the check of VHOST_NEW_WORKER from vhost_scsi to vhost > 2. Change the ioctl name VHOST_SET_INHERIT_FROM_OWNER to VHOST_FORK_FROM_OWNER > 3. reuse the function __vhost_worker_flush > 4. use a ops sturct to support worker relates function > 5. reset the value of inherit_owner in vhost_dev_reset_owner s. > > Changelog v7: > 1. add a KConfig knob to disable legacy app support > 2. Split the changes into two patches to separately introduce the ops and add kthread support. > 3. Utilized INX_MAX to avoid modifications in __vhost_worker_flush > 4. Rebased on the latest kernel > 5. Address other comments > > Tested with QEMU with kthread mode/task mode/kthread+task mode > > Cindy Lu (8): > vhost: Add a new parameter in vhost_dev to allow user select kthread > vhost: Reintroduce vhost_worker to support kthread > vhost: Add the cgroup related function > vhost: Introduce vhost_worker_ops in vhost_worker > vhost: Reintroduce kthread mode support in vhost > vhost: uapi to control task mode (owner vs kthread) > vhost: Add check for inherit_owner status > vhost: Add a KConfig knob to enable IOCTL VHOST_FORK_FROM_OWNER > > drivers/vhost/Kconfig | 15 +++ > drivers/vhost/vhost.c | 227 +++++++++++++++++++++++++++++++++---- > drivers/vhost/vhost.h | 21 ++++ > include/uapi/linux/vhost.h | 15 +++ > 4 files changed, 259 insertions(+), 19 deletions(-) > > -- > 2.45.0