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charset="utf-8" Add a VHOST_USER_RESET_DEVICE message which will reset the vhost user backend. Disabling all rings, and resetting all internal state, ready for the backend to be reinitialized. A backend has to report it supports this features with the VHOST_USER_PROTOCOL_F_RESET_DEVICE protocol feature bit. If it does so, the new message is used instead of sending a RESET_OWNER which has had inconsistent implementations. Signed-off-by: David Vrabel --- docs/interop/vhost-user.txt | 16 ++++++++++++++++ hw/virtio/vhost-user.c | 8 +++++++- 2 files changed, 23 insertions(+), 1 deletion(-) diff --git a/docs/interop/vhost-user.txt b/docs/interop/vhost-user.txt index cb3a7595aa..c5faa9fff8 100644 --- a/docs/interop/vhost-user.txt +++ b/docs/interop/vhost-user.txt @@ -369,6 +369,7 @@ Protocol features #define VHOST_USER_PROTOCOL_F_SLAVE_REQ 5 #define VHOST_USER_PROTOCOL_F_CROSS_ENDIAN 6 #define VHOST_USER_PROTOCOL_F_CRYPTO_SESSION 7 +#define VHOST_USER_PROTOCOL_F_RESET_DEVICE 8 =20 Master message types -------------------- @@ -689,6 +690,21 @@ Master message types feature has been successfully negotiated. It's a required feature for crypto devices. =20 + * VHOST_USER_RESET_DEVICE + + Id: 28 + Equivalent ioctl: N/A + Master payload: N/A + Slave payload: N/A + + Ask the vhost user backend to disable all rings and reset all + internal device state to the initial state, ready to be + reinitialized. The backend retains ownership of the device + throughout the reset operation. + + Only valid if the VHOST_USER_PROTOCOL_F_RESET_DEVICE protocol + feature is set by the backend. + Slave message types ------------------- =20 diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 41ff5cff41..67207bfe8a 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -41,6 +41,7 @@ enum VhostUserProtocolFeature { VHOST_USER_PROTOCOL_F_SLAVE_REQ =3D 5, VHOST_USER_PROTOCOL_F_CROSS_ENDIAN =3D 6, VHOST_USER_PROTOCOL_F_CRYPTO_SESSION =3D 7, + VHOST_USER_PROTOCOL_F_RESET_DEVICE =3D 8, =20 VHOST_USER_PROTOCOL_F_MAX }; @@ -76,6 +77,7 @@ typedef enum VhostUserRequest { VHOST_USER_SET_CONFIG =3D 25, VHOST_USER_CREATE_CRYPTO_SESSION =3D 26, VHOST_USER_CLOSE_CRYPTO_SESSION =3D 27, + VHOST_USER_RESET_DEVICE =3D 28, VHOST_USER_MAX } VhostUserRequest; =20 @@ -641,10 +643,14 @@ static int vhost_user_set_owner(struct vhost_dev *dev) static int vhost_user_reset_device(struct vhost_dev *dev) { VhostUserMsg msg =3D { - .hdr.request =3D VHOST_USER_RESET_OWNER, .hdr.flags =3D VHOST_USER_VERSION, }; =20 + msg.hdr.request =3D virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_RESET_DEVIC= E) + ? VHOST_USER_RESET_DEVICE + : VHOST_USER_RESET_OWNER; + if (vhost_user_write(dev, &msg, NULL, 0) < 0) { return -1; } --=20 2.11.0 From nobody Sat Oct 25 11:05:06 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; dkim=fail; spf=pass (zoho.com: domain of gnu.org designates 208.118.235.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org; dmarc=fail(p=none dis=none) header.from=nutanix.com Return-Path: Received: from lists.gnu.org (208.118.235.17 [208.118.235.17]) by mx.zohomail.com with SMTPS id 1521472550181247.6740205383585; Mon, 19 Mar 2018 08:15:50 -0700 (PDT) Received: from localhost ([::1]:42488 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1exwVi-0007XC-6l for importer@patchew.org; Mon, 19 Mar 2018 11:15:42 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:56173) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1exwU2-0006X8-Vi for qemu-devel@nongnu.org; Mon, 19 Mar 2018 11:13:59 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1exwTz-0001ou-OI for qemu-devel@nongnu.org; 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charset="utf-8" If the vhost-user-scsi backend supports the VHOST_USER_F_RESET_DEVICE protocol feature, then the device can be reset when requested. If this feature is not supported, do not try a reset as this will send a VHOST_USER_RESET_OWNER that the backend is not expecting, potentially putting into an inoperable state. Signed-off-by: David Vrabel --- hw/scsi/vhost-user-scsi.c | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c index 9389ed48e0..15e2dabebb 100644 --- a/hw/scsi/vhost-user-scsi.c +++ b/hw/scsi/vhost-user-scsi.c @@ -37,6 +37,10 @@ static const int user_feature_bits[] =3D { VHOST_INVALID_FEATURE_BIT }; =20 +enum VhostUserProtocolFeature { + VHOST_USER_PROTOCOL_F_RESET_DEVICE =3D 8, +}; + static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status) { VHostUserSCSI *s =3D (VHostUserSCSI *)vdev; @@ -60,6 +64,25 @@ static void vhost_user_scsi_set_status(VirtIODevice *vde= v, uint8_t status) } } =20 +static void vhost_user_scsi_reset(VirtIODevice *vdev) +{ + VHostSCSICommon *vsc =3D VHOST_SCSI_COMMON(vdev); + struct vhost_dev *dev =3D &vsc->dev; + + /* + * Historically, reset was not implemented so only reset devices + * that are expecting it. + */ + if (!virtio_has_feature(dev->protocol_features, + VHOST_USER_PROTOCOL_F_RESET_DEVICE)) { + return; + } + + if (dev->vhost_ops->vhost_reset_device) { + dev->vhost_ops->vhost_reset_device(dev); + } +} + static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq) { } @@ -172,6 +195,7 @@ static void vhost_user_scsi_class_init(ObjectClass *kla= ss, void *data) vdc->get_features =3D vhost_user_scsi_get_features; vdc->set_config =3D vhost_scsi_common_set_config; vdc->set_status =3D vhost_user_scsi_set_status; + vdc->reset =3D vhost_user_scsi_reset; fwc->get_dev_path =3D vhost_scsi_common_get_fw_dev_path; } =20 --=20 2.11.0