From b282418bc366194677eafd1dad180d92254586ac Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Eugenio=20P=C3=A9rez?= Date: Tue, 7 Jul 2026 14:33:44 +0200 Subject: vduse: Add suspend MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Implement suspend operation for vduse devices, so vhost-vdpa will offer that backend feature and userspace can effectively suspend the device. This is a must before get virtqueue indexes (base) for live migration, since the device could modify them after userland gets them. This patch does not implement resume, so VMM resets the whole device to recover from a live migration failure. Resume optimization can be implemented on top of these patches, as other vDPA devices have done in the past. Signed-off-by: Eugenio Pérez Signed-off-by: Michael S. Tsirkin Message-ID: <20260707123344.244575-3-eperezma@redhat.com> --- include/uapi/linux/vduse.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'include/uapi/linux') diff --git a/include/uapi/linux/vduse.h b/include/uapi/linux/vduse.h index 7285f8570237..b7f8c04a0a44 100644 --- a/include/uapi/linux/vduse.h +++ b/include/uapi/linux/vduse.h @@ -17,6 +17,9 @@ /* The VDUSE instance expects a request for vq ready */ #define VDUSE_F_QUEUE_READY 0 +/* The VDUSE instance expects a request for suspend */ +#define VDUSE_F_SUSPEND 1 + /* * Get the version of VDUSE API that kernel supported (VDUSE_API_VERSION). * This is used for future extension. @@ -335,6 +338,7 @@ enum vduse_req_type { VDUSE_UPDATE_IOTLB, VDUSE_SET_VQ_GROUP_ASID, VDUSE_SET_VQ_READY, + VDUSE_SUSPEND, }; /** -- cgit v1.2.3