linux-kernel - [PATCH vhost v4 02/15] vdpa: Add VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN

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Message-ID: <20231219180858.120898-3-dtatulea@nvidia.com>
Date: Tue, 19 Dec 2023 20:08:45 +0200
From: Dragos Tatulea <dtatulea@...dia.com>
To: "Michael S . Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
	Eugenio Perez Martin <eperezma@...hat.com>, Si-Wei Liu
	<si-wei.liu@...cle.com>, Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky
	<leon@...nel.org>, <virtualization@...ts.linux-foundation.org>, Gal Pressman
	<gal@...dia.com>
CC: Dragos Tatulea <dtatulea@...dia.com>, <kvm@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Parav Pandit <parav@...dia.com>, Xuan Zhuo
	<xuanzhuo@...ux.alibaba.com>
Subject: [PATCH vhost v4 02/15] vdpa: Add VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND flag

The virtio spec doesn't allow changing virtqueue addresses after
DRIVER_OK. Some devices do support this operation when the device is
suspended. The VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND flag
advertises this support as a backend features.

Signed-off-by: Dragos Tatulea <dtatulea@...dia.com>
Suggested-by: Eugenio Pérez <eperezma@...hat.com>
---
 include/uapi/linux/vhost_types.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/uapi/linux/vhost_types.h b/include/uapi/linux/vhost_types.h
index d7656908f730..aacd067afc89 100644
--- a/include/uapi/linux/vhost_types.h
+++ b/include/uapi/linux/vhost_types.h
@@ -192,5 +192,9 @@ struct vhost_vdpa_iova_range {
 #define VHOST_BACKEND_F_DESC_ASID    0x7
 /* IOTLB don't flush memory mapping across device reset */
 #define VHOST_BACKEND_F_IOTLB_PERSIST  0x8
+/* Device supports changing virtqueue addresses when device is suspended
+ * and is in state DRIVER_OK.
+ */
+#define VHOST_BACKEND_F_CHANGEABLE_VQ_ADDR_IN_SUSPEND  0x9
 
 #endif
-- 
2.43.0