Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost

Pull virtio updates from Michael Tsirkin:
 "vhost and virtio fixes and features:

   - Hardening work by Jason

   - vdpa driver for Alibaba ENI

   - Performance tweaks for virtio blk

   - virtio rng rework using an internal buffer

   - mac/mtu programming for mlx5 vdpa

   - Misc fixes, cleanups"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost: (45 commits)
  vdpa/mlx5: Forward only packets with allowed MAC address
  vdpa/mlx5: Support configuration of MAC
  vdpa/mlx5: Fix clearing of VIRTIO_NET_F_MAC feature bit
  vdpa_sim_net: Enable user to set mac address and mtu
  vdpa: Enable user to set mac and mtu of vdpa device
  vdpa: Use kernel coding style for structure comments
  vdpa: Introduce query of device config layout
  vdpa: Introduce and use vdpa device get, set config helpers
  virtio-scsi: don't let virtio core to validate used buffer length
  virtio-blk: don't let virtio core to validate used length
  virtio-net: don't let virtio core to validate used length
  virtio_ring: validate used buffer length
  virtio_blk: correct types for status handling
  virtio_blk: allow 0 as num_request_queues
  i2c: virtio: Add support for zero-length requests
  virtio-blk: fixup coccinelle warnings
  virtio_ring: fix typos in vring_desc_extra
  virtio-pci: harden INTX interrupts
  virtio_pci: harden MSI-X interrupts
  virtio_config: introduce a new .enable_cbs method
  ...

6 files changed, 98 insertions, 18 deletions

diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
index 3972ab765de1..c3011ccda430 100644
--- a/include/linux/vdpa.h
+++ b/include/linux/vdpa.h
@@ -6,6 +6,8 @@
 #include <linux/device.h>
 #include <linux/interrupt.h>
 #include <linux/vhost_iotlb.h>
+#include <linux/virtio_net.h>
+#include <linux/if_ether.h>
 
 /**
  * struct vdpa_calllback - vDPA callback definition.
@@ -63,6 +65,7 @@ struct vdpa_mgmt_dev;
  * @dev: underlying device
  * @dma_dev: the actual device that is performing DMA
  * @config: the configuration ops for this device.
+ * @cf_mutex: Protects get and set access to configuration layout.
  * @index: device index
  * @features_valid: were features initialized? for legacy guests
  * @use_va: indicate whether virtual address must be used by this device
@@ -74,6 +77,7 @@ struct vdpa_device {
 	struct device dev;
 	struct device *dma_dev;
 	const struct vdpa_config_ops *config;
+	struct mutex cf_mutex; /* Protects get/set config */
 	unsigned int index;
 	bool features_valid;
 	bool use_va;
@@ -91,6 +95,14 @@ struct vdpa_iova_range {
 	u64 last;
 };
 
+struct vdpa_dev_set_config {
+	struct {
+		u8 mac[ETH_ALEN];
+		u16 mtu;
+	} net;
+	u64 mask;
+};
+
 /**
  * Corresponding file area for device memory mapping
  * @file: vma->vm_file for the mapping
@@ -171,6 +183,9 @@ struct vdpa_map_file {
  * @get_vq_num_max:		Get the max size of virtqueue
  *				@vdev: vdpa device
  *				Returns u16: max size of virtqueue
+ * @get_vq_num_min:		Get the min size of virtqueue (optional)
+ *				@vdev: vdpa device
+ *				Returns u16: min size of virtqueue
  * @get_device_id:		Get virtio device id
  *				@vdev: vdpa device
  *				Returns u32: virtio device id
@@ -257,7 +272,7 @@ struct vdpa_config_ops {
 	struct vdpa_notification_area
 	(*get_vq_notification)(struct vdpa_device *vdev, u16 idx);
 	/* vq irq is not expected to be changed once DRIVER_OK is set */
-	int (*get_vq_irq)(struct vdpa_device *vdv, u16 idx);
+	int (*get_vq_irq)(struct vdpa_device *vdev, u16 idx);
 
 	/* Device ops */
 	u32 (*get_vq_align)(struct vdpa_device *vdev);
@@ -266,6 +281,7 @@ struct vdpa_config_ops {
 	void (*set_config_cb)(struct vdpa_device *vdev,
 			      struct vdpa_callback *cb);
 	u16 (*get_vq_num_max)(struct vdpa_device *vdev);
+	u16 (*get_vq_num_min)(struct vdpa_device *vdev);
 	u32 (*get_device_id)(struct vdpa_device *vdev);
 	u32 (*get_vendor_id)(struct vdpa_device *vdev);
 	u8 (*get_status)(struct vdpa_device *vdev);
@@ -382,26 +398,16 @@ static inline int vdpa_set_features(struct vdpa_device *vdev, u64 features)
 	return ops->set_features(vdev, features);
 }
 
-static inline void vdpa_get_config(struct vdpa_device *vdev,
-				   unsigned int offset, void *buf,
-				   unsigned int len)
-{
-	const struct vdpa_config_ops *ops = vdev->config;
-
-	/*
-	 * Config accesses aren't supposed to trigger before features are set.
-	 * If it does happen we assume a legacy guest.
-	 */
-	if (!vdev->features_valid)
-		vdpa_set_features(vdev, 0);
-	ops->get_config(vdev, offset, buf, len);
-}
-
+void vdpa_get_config(struct vdpa_device *vdev, unsigned int offset,
+		     void *buf, unsigned int len);
+void vdpa_set_config(struct vdpa_device *dev, unsigned int offset,
+		     const void *buf, unsigned int length);
 /**
  * struct vdpa_mgmtdev_ops - vdpa device ops
  * @dev_add: Add a vdpa device using alloc and register
  *	     @mdev: parent device to use for device addition
  *	     @name: name of the new vdpa device
+ *	     @config: config attributes to apply to the device under creation
  *	     Driver need to add a new device using _vdpa_register_device()
  *	     after fully initializing the vdpa device. Driver must return 0
  *	     on success or appropriate error code.
@@ -412,14 +418,25 @@ static inline void vdpa_get_config(struct vdpa_device *vdev,
  *	     _vdpa_unregister_device().
  */
 struct vdpa_mgmtdev_ops {
-	int (*dev_add)(struct vdpa_mgmt_dev *mdev, const char *name);
+	int (*dev_add)(struct vdpa_mgmt_dev *mdev, const char *name,
+		       const struct vdpa_dev_set_config *config);
 	void (*dev_del)(struct vdpa_mgmt_dev *mdev, struct vdpa_device *dev);
 };
 
+/**
+ * struct vdpa_mgmt_dev - vdpa management device
+ * @device: Management parent device
+ * @ops: operations supported by management device
+ * @id_table: Pointer to device id table of supported ids
+ * @config_attr_mask: bit mask of attributes of type enum vdpa_attr that
+ *		      management device support during dev_add callback
+ * @list: list entry
+ */
 struct vdpa_mgmt_dev {
 	struct device *device;
 	const struct vdpa_mgmtdev_ops *ops;
-	const struct virtio_device_id *id_table; /* supported ids */
+	const struct virtio_device_id *id_table;
+	u64 config_attr_mask;
 	struct list_head list;
 };
 
diff --git a/include/linux/virtio.h b/include/linux/virtio.h
index 41edbc01ffa4..44d0e09da2d9 100644
--- a/include/linux/virtio.h
+++ b/include/linux/virtio.h
@@ -152,6 +152,7 @@ size_t virtio_max_dma_size(struct virtio_device *vdev);
  * @feature_table_size: number of entries in the feature table array.
  * @feature_table_legacy: same as feature_table but when working in legacy mode.
  * @feature_table_size_legacy: number of entries in feature table legacy array.
+ * @suppress_used_validation: set to not have core validate used length
  * @probe: the function to call when a device is found.  Returns 0 or -errno.
  * @scan: optional function to call after successful probe; intended
  *    for virtio-scsi to invoke a scan.
@@ -168,6 +169,7 @@ struct virtio_driver {
 	unsigned int feature_table_size;
 	const unsigned int *feature_table_legacy;
 	unsigned int feature_table_size_legacy;
+	bool suppress_used_validation;
 	int (*validate)(struct virtio_device *dev);
 	int (*probe)(struct virtio_device *dev);
 	void (*scan)(struct virtio_device *dev);
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index 8519b3ae5d52..4d107ad31149 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -23,6 +23,8 @@ struct virtio_shm_region {
  *       any of @get/@set, @get_status/@set_status, or @get_features/
  *       @finalize_features are NOT safe to be called from an atomic
  *       context.
+ * @enable_cbs: enable the callbacks
+ *      vdev: the virtio_device
  * @get: read the value of a configuration field
  *	vdev: the virtio_device
  *	offset: the offset of the configuration field
@@ -75,6 +77,7 @@ struct virtio_shm_region {
  */
 typedef void vq_callback_t(struct virtqueue *);
 struct virtio_config_ops {
+	void (*enable_cbs)(struct virtio_device *vdev);
 	void (*get)(struct virtio_device *vdev, unsigned offset,
 		    void *buf, unsigned len);
 	void (*set)(struct virtio_device *vdev, unsigned offset,
@@ -229,6 +232,9 @@ void virtio_device_ready(struct virtio_device *dev)
 {
 	unsigned status = dev->config->get_status(dev);
 
+	if (dev->config->enable_cbs)
+                  dev->config->enable_cbs(dev);
+
 	BUG_ON(status & VIRTIO_CONFIG_S_DRIVER_OK);
 	dev->config->set_status(dev, status | VIRTIO_CONFIG_S_DRIVER_OK);
 }
diff --git a/include/linux/virtio_pci_legacy.h b/include/linux/virtio_pci_legacy.h
new file mode 100644
index 000000000000..e5d665faf00e
--- /dev/null
+++ b/include/linux/virtio_pci_legacy.h
@@ -0,0 +1,42 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_VIRTIO_PCI_LEGACY_H
+#define _LINUX_VIRTIO_PCI_LEGACY_H
+
+#include "linux/mod_devicetable.h"
+#include <linux/pci.h>
+#include <linux/virtio_pci.h>
+
+struct virtio_pci_legacy_device {
+	struct pci_dev *pci_dev;
+
+	/* Where to read and clear interrupt */
+	u8 __iomem *isr;
+	/* The IO mapping for the PCI config space (legacy mode only) */
+	void __iomem *ioaddr;
+
+	struct virtio_device_id id;
+};
+
+u64 vp_legacy_get_features(struct virtio_pci_legacy_device *ldev);
+u64 vp_legacy_get_driver_features(struct virtio_pci_legacy_device *ldev);
+void vp_legacy_set_features(struct virtio_pci_legacy_device *ldev,
+			u32 features);
+u8 vp_legacy_get_status(struct virtio_pci_legacy_device *ldev);
+void vp_legacy_set_status(struct virtio_pci_legacy_device *ldev,
+			u8 status);
+u16 vp_legacy_queue_vector(struct virtio_pci_legacy_device *ldev,
+			   u16 idx, u16 vector);
+u16 vp_legacy_config_vector(struct virtio_pci_legacy_device *ldev,
+		     u16 vector);
+void vp_legacy_set_queue_address(struct virtio_pci_legacy_device *ldev,
+			     u16 index, u32 queue_pfn);
+bool vp_legacy_get_queue_enable(struct virtio_pci_legacy_device *ldev,
+				u16 idx);
+void vp_legacy_set_queue_size(struct virtio_pci_legacy_device *ldev,
+			      u16 idx, u16 size);
+u16 vp_legacy_get_queue_size(struct virtio_pci_legacy_device *ldev,
+			     u16 idx);
+int vp_legacy_probe(struct virtio_pci_legacy_device *ldev);
+void vp_legacy_remove(struct virtio_pci_legacy_device *ldev);
+
+#endif
diff --git a/include/uapi/linux/vdpa.h b/include/uapi/linux/vdpa.h
index 66a41e4ec163..a252f06f9dfd 100644
--- a/include/uapi/linux/vdpa.h
+++ b/include/uapi/linux/vdpa.h
@@ -17,6 +17,7 @@ enum vdpa_command {
 	VDPA_CMD_DEV_NEW,
 	VDPA_CMD_DEV_DEL,
 	VDPA_CMD_DEV_GET,		/* can dump */
+	VDPA_CMD_DEV_CONFIG_GET,	/* can dump */
 };
 
 enum vdpa_attr {
@@ -32,6 +33,12 @@ enum vdpa_attr {
 	VDPA_ATTR_DEV_VENDOR_ID,		/* u32 */
 	VDPA_ATTR_DEV_MAX_VQS,			/* u32 */
 	VDPA_ATTR_DEV_MAX_VQ_SIZE,		/* u16 */
+	VDPA_ATTR_DEV_MIN_VQ_SIZE,		/* u16 */
+
+	VDPA_ATTR_DEV_NET_CFG_MACADDR,		/* binary */
+	VDPA_ATTR_DEV_NET_STATUS,		/* u8 */
+	VDPA_ATTR_DEV_NET_CFG_MAX_VQP,		/* u16 */
+	VDPA_ATTR_DEV_NET_CFG_MTU,		/* u16 */
 
 	/* new attributes must be added above here */
 	VDPA_ATTR_MAX,
diff --git a/include/uapi/linux/virtio_i2c.h b/include/uapi/linux/virtio_i2c.h
index 7c6a6fc01ad6..acf3b6069136 100644
--- a/include/uapi/linux/virtio_i2c.h
+++ b/include/uapi/linux/virtio_i2c.h
@@ -11,9 +11,15 @@
 #include <linux/const.h>
 #include <linux/types.h>
 
+/* Virtio I2C Feature bits */
+#define VIRTIO_I2C_F_ZERO_LENGTH_REQUEST	0
+
 /* The bit 0 of the @virtio_i2c_out_hdr.@flags, used to group the requests */
 #define VIRTIO_I2C_FLAGS_FAIL_NEXT	_BITUL(0)
 
+/* The bit 1 of the @virtio_i2c_out_hdr.@flags, used to mark a buffer as read */
+#define VIRTIO_I2C_FLAGS_M_RD		_BITUL(1)
+
 /**
  * struct virtio_i2c_out_hdr - the virtio I2C message OUT header
  * @addr: the controlled device address