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...eturn r; + if (copy_to_user(argp, &backend, sizeof(backend))) + return -EFAULT; + return 0; case VHOST_GET_FEATURES: features = VHOST_SCSI_FEATURES; if (copy_to_user(featurep, &features, sizeof features)) diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index bb6a5b4..5d350f7 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -155,4 +155,6 @@ struct vhost_scsi_target { #define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32) #define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32) +#define VHOST_SCSI_GET_TPGT...

...eturn r; + if (copy_to_user(argp, &backend, sizeof(backend))) + return -EFAULT; + return 0; case VHOST_GET_FEATURES: features = VHOST_SCSI_FEATURES; if (copy_to_user(featurep, &features, sizeof features)) diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index bb6a5b4..5d350f7 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -155,4 +155,6 @@ struct vhost_scsi_target { #define VHOST_SCSI_SET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x43, __u32) #define VHOST_SCSI_GET_EVENTS_MISSED _IOW(VHOST_VIRTIO, 0x44, __u32) +#define VHOST_SCSI_GET_TPGT...

...gt; + vq->is_le = true; > +} > +#endif /* CONFIG_VHOST_CROSS_ENDIAN_LEGACY */ > + > static void vhost_poll_func(struct file *file, wait_queue_head_t *wqh, > poll_table *pt) > { (...) > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..b980b53 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -103,6 +103,18 @@ struct vhost_memory { > /* Get accessor: reads index, writes value in num */ > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) > > +/...

...gt; + vq->is_le = true; > +} > +#endif /* CONFIG_VHOST_CROSS_ENDIAN_LEGACY */ > + > static void vhost_poll_func(struct file *file, wait_queue_head_t *wqh, > poll_table *pt) > { (...) > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..b980b53 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -103,6 +103,18 @@ struct vhost_memory { > /* Get accessor: reads index, writes value in num */ > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) > > +/...

...gt; if (vhost_has_feature(vq, VIRTIO_F_VERSION_1)) > return true; > - return virtio_legacy_is_little_endian(); > + return vhost_legacy_is_little_endian(vq); > } > > /* Memory accessors */ > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..1b01a72 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -103,6 +103,11 @@ struct vhost_memory { > /* Get accessor: reads index, writes value in num */ > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) > > +...

...gt; if (vhost_has_feature(vq, VIRTIO_F_VERSION_1)) > return true; > - return virtio_legacy_is_little_endian(); > + return vhost_legacy_is_little_endian(vq); > } > > /* Memory accessors */ > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..1b01a72 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -103,6 +103,11 @@ struct vhost_memory { > /* Get accessor: reads index, writes value in num */ > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) > > +...

...gt; if (vhost_has_feature(vq, VIRTIO_F_VERSION_1)) > return true; > - return virtio_legacy_is_little_endian(); > + return vhost_legacy_is_little_endian(vq); > } > > /* Memory accessors */ > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..1b01a72 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -103,6 +103,11 @@ struct vhost_memory { > /* Get accessor: reads index, writes value in num */ > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) > > +...

...gt; if (vhost_has_feature(vq, VIRTIO_F_VERSION_1)) > return true; > - return virtio_legacy_is_little_endian(); > + return vhost_legacy_is_little_endian(vq); > } > > /* Memory accessors */ > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..1b01a72 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -103,6 +103,11 @@ struct vhost_memory { > /* Get accessor: reads index, writes value in num */ > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) > > +...

...struct vhost_virtqueue { /* Log write descriptors */ void __user *log_base; struct vhost_log *log; + + /* We need to know the device endianness with legacy virtio. */ + bool legacy_big_endian; }; struct vhost_dev { diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index bb6a5b4..0bf4491 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -34,6 +34,8 @@ struct vhost_vring_addr { /* Flag values: */ /* Whether log address is valid. If set enables logging. */ #define VHOST_VRING_F_LOG 0 + /* Whether we have a big-endian legacy virtio device. */ +#...

...struct vhost_virtqueue { /* Log write descriptors */ void __user *log_base; struct vhost_log *log; + + /* We need to know the device endianness with legacy virtio. */ + bool legacy_big_endian; }; struct vhost_dev { diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index bb6a5b4..0bf4491 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -34,6 +34,8 @@ struct vhost_vring_addr { /* Flag values: */ /* Whether log address is valid. If set enables logging. */ #define VHOST_VRING_F_LOG 0 + /* Whether we have a big-endian legacy virtio device. */ +#...

...tqueue *vq) > { > - if (vhost_has_feature(vq, VIRTIO_F_VERSION_1)) > - return true; > - return virtio_legacy_is_little_endian(); > + return vq->is_le; > } > > /* Memory accessors */ > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..5cdebbc 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -103,6 +103,15 @@ struct vhost_memory { > /* Get accessor: reads index, writes value in num */ > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) > > +...

...tqueue *vq) > { > - if (vhost_has_feature(vq, VIRTIO_F_VERSION_1)) > - return true; > - return virtio_legacy_is_little_endian(); > + return vq->is_le; > } > > /* Memory accessors */ > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..5cdebbc 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -103,6 +103,15 @@ struct vhost_memory { > /* Get accessor: reads index, writes value in num */ > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) > > +...

...endian to !virtio_legacy_is_little_endian() on reset. Maybe rename to legacy_is_little_endian so you don't need to reverse the logic. > +#endif > return virtio_legacy_is_little_endian(); > } > > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..09d2a48 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -47,6 +47,11 @@ struct vhost_vring_addr { > __u64 log_guest_addr; > }; > > +struct vhost_vring_endian { > + unsigned int index; > + bool is_big_endian; bool in uapi is a bad i...

...endian to !virtio_legacy_is_little_endian() on reset. Maybe rename to legacy_is_little_endian so you don't need to reverse the logic. > +#endif > return virtio_legacy_is_little_endian(); > } > > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index bb6a5b4..09d2a48 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -47,6 +47,11 @@ struct vhost_vring_addr { > __u64 log_guest_addr; > }; > > +struct vhost_vring_endian { > + unsigned int index; > + bool is_big_endian; bool in uapi is a bad i...

...ittle_endian(struct vhost_virtqueue *vq) { if (vhost_has_feature(vq, VIRTIO_F_VERSION_1)) return true; - return virtio_legacy_is_little_endian(); + return vhost_legacy_is_little_endian(vq); } /* Memory accessors */ diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index bb6a5b4..1b01a72 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -103,6 +103,11 @@ struct vhost_memory { /* Get accessor: reads index, writes value in num */ #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) +/* Set endianness for the ring (leg...

Hi, This patchset allows vhost_net to be used with legacy virtio when guest and host have a different endianness. It is based on previous work by C?dric Le Goater: https://www.mail-archive.com/kvm-ppc at vger.kernel.org/msg09848.html As suggested by MST: - the API now asks for a specific format (big endian) instead of the hint whether byteswap is needed or not (patch 1) - rebased on top of

Hi, This patchset allows vhost_net to be used with legacy virtio when guest and host have a different endianness. It is based on previous work by C?dric Le Goater: https://www.mail-archive.com/kvm-ppc at vger.kernel.org/msg09848.html As suggested by MST: - the API now asks for a specific format (big endian) instead of the hint whether byteswap is needed or not (patch 1) - rebased on top of

...VIRTIO_F_VERSION_1)) return true; +#ifdef CONFIG_VHOST_SET_ENDIAN_LEGACY + if (vhost_has_feature(vq, VHOST_F_SET_ENDIAN_LEGACY)) + return !vq->legacy_big_endian; +#endif return virtio_legacy_is_little_endian(); } diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index bb6a5b4..09d2a48 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -47,6 +47,11 @@ struct vhost_vring_addr { __u64 log_guest_addr; }; +struct vhost_vring_endian { + unsigned int index; + bool is_big_endian; +}; + struct vhost_memory_region { __u64 guest_phys_addr; __u64...

...nline bool vhost_is_little_endian(struct vhost_virtqueue *vq) { - if (vhost_has_feature(vq, VIRTIO_F_VERSION_1)) - return true; - return virtio_legacy_is_little_endian(); + return vq->is_le; } /* Memory accessors */ diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h index bb6a5b4..5cdebbc 100644 --- a/include/uapi/linux/vhost.h +++ b/include/uapi/linux/vhost.h @@ -103,6 +103,15 @@ struct vhost_memory { /* Get accessor: reads index, writes value in num */ #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_vring_state) +/* Set the vring byte order in num....

...> +#endif /* CONFIG_VHOST_CROSS_ENDIAN_LEGACY */ > > + > > static void vhost_poll_func(struct file *file, wait_queue_head_t *wqh, > > poll_table *pt) > > { > (...) > > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > > index bb6a5b4..b980b53 100644 > > --- a/include/uapi/linux/vhost.h > > +++ b/include/uapi/linux/vhost.h > > @@ -103,6 +103,18 @@ struct vhost_memory { > > /* Get accessor: reads index, writes value in num */ > > #define VHOST_GET_VRING_BASE _IOWR(VHOST_VIRTIO, 0x12, struct vhost_v...