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...: > Signed-off-by: Greg Kurz <gkurz at linux.vnet.ibm.com> > --- > include/linux/virtio_config.h | 17 +++++++++++------ > 1 file changed, 11 insertions(+), 6 deletions(-) > > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h > index ca3ed78..bd1a582 100644 > --- a/include/linux/virtio_config.h > +++ b/include/linux/virtio_config.h > @@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) > return 0; > } > > +static inline bool virtio_is_little_endian(struct virtio_device *vdev) > +{ > + r...

...: > Signed-off-by: Greg Kurz <gkurz at linux.vnet.ibm.com> > --- > include/linux/virtio_config.h | 17 +++++++++++------ > 1 file changed, 11 insertions(+), 6 deletions(-) > > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h > index ca3ed78..bd1a582 100644 > --- a/include/linux/virtio_config.h > +++ b/include/linux/virtio_config.h > @@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) > return 0; > } > > +static inline bool virtio_is_little_endian(struct virtio_device *vdev) > +{ > + r...

...return (__force __virtio64)cpu_to_le64(val); > else > - return (__force __virtio64)val; > + return (__force __virtio64)cpu_to_be64(val); > } > > #endif /* _LINUX_VIRTIO_BYTEORDER */ > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h > index bd1a582..36a6daa 100644 > --- a/include/linux/virtio_config.h > +++ b/include/linux/virtio_config.h > @@ -207,7 +207,9 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) > > static inline bool virtio_is_little_endian(struct virtio_device *vdev) > { > - return virtio_has_f...

...return (__force __virtio64)cpu_to_le64(val); > else > - return (__force __virtio64)val; > + return (__force __virtio64)cpu_to_be64(val); > } > > #endif /* _LINUX_VIRTIO_BYTEORDER */ > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h > index bd1a582..36a6daa 100644 > --- a/include/linux/virtio_config.h > +++ b/include/linux/virtio_config.h > @@ -207,7 +207,9 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) > > static inline bool virtio_is_little_endian(struct virtio_device *vdev) > { > - return virtio_has_f...

...return (__force __virtio64)cpu_to_le64(val); > else > - return (__force __virtio64)val; > + return (__force __virtio64)cpu_to_be64(val); > } > > #endif /* _LINUX_VIRTIO_BYTEORDER */ > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h > index bd1a582..36a6daa 100644 > --- a/include/linux/virtio_config.h > +++ b/include/linux/virtio_config.h > @@ -207,7 +207,9 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) > > static inline bool virtio_is_little_endian(struct virtio_device *vdev) > { > - return virtio_has_f...

...return (__force __virtio64)cpu_to_le64(val); > else > - return (__force __virtio64)val; > + return (__force __virtio64)cpu_to_be64(val); > } > > #endif /* _LINUX_VIRTIO_BYTEORDER */ > diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h > index bd1a582..36a6daa 100644 > --- a/include/linux/virtio_config.h > +++ b/include/linux/virtio_config.h > @@ -207,7 +207,9 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) > > static inline bool virtio_is_little_endian(struct virtio_device *vdev) > { > - return virtio_has_f...

Signed-off-by: Greg Kurz <gkurz at linux.vnet.ibm.com> --- include/linux/virtio_config.h | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index ca3ed78..bd1a582 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) return 0; } +static inline bool virtio_is_little_endian(struct virtio_device *vdev) +{ + return virtio_has_feature(vdev, VIRTIO_F_VERSI...

Signed-off-by: Greg Kurz <gkurz at linux.vnet.ibm.com> --- include/linux/virtio_config.h | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-) diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index ca3ed78..bd1a582 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -205,35 +205,40 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) return 0; } +static inline bool virtio_is_little_endian(struct virtio_device *vdev) +{ + return virtio_has_feature(vdev, VIRTIO_F_VERSI...

...endian, u64 val) if (little_endian) return (__force __virtio64)cpu_to_le64(val); else - return (__force __virtio64)val; + return (__force __virtio64)cpu_to_be64(val); } #endif /* _LINUX_VIRTIO_BYTEORDER */ diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index bd1a582..36a6daa 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -207,7 +207,9 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) static inline bool virtio_is_little_endian(struct virtio_device *vdev) { - return virtio_has_feature(vdev, VIRTIO_F_VERSION_1); +...

...endian, u64 val) if (little_endian) return (__force __virtio64)cpu_to_le64(val); else - return (__force __virtio64)val; + return (__force __virtio64)cpu_to_be64(val); } #endif /* _LINUX_VIRTIO_BYTEORDER */ diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index bd1a582..36a6daa 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -207,7 +207,9 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) static inline bool virtio_is_little_endian(struct virtio_device *vdev) { - return virtio_has_feature(vdev, VIRTIO_F_VERSION_1); +...

...endian, u64 val) if (little_endian) return (__force __virtio64)cpu_to_le64(val); else - return (__force __virtio64)val; + return (__force __virtio64)cpu_to_be64(val); } #endif /* _LINUX_VIRTIO_BYTEORDER */ diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index bd1a582..f64919e 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -207,7 +207,8 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) static inline bool virtio_is_little_endian(struct virtio_device *vdev) { - return virtio_has_feature(vdev, VIRTIO_F_VERSION_1); +...

...endian, u64 val) if (little_endian) return (__force __virtio64)cpu_to_le64(val); else - return (__force __virtio64)val; + return (__force __virtio64)cpu_to_be64(val); } #endif /* _LINUX_VIRTIO_BYTEORDER */ diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h index bd1a582..743e24c 100644 --- a/include/linux/virtio_config.h +++ b/include/linux/virtio_config.h @@ -207,7 +207,10 @@ int virtqueue_set_affinity(struct virtqueue *vq, int cpu) static inline bool virtio_is_little_endian(struct virtio_device *vdev) { - return virtio_has_feature(vdev, VIRTIO_F_VERSION_1);...

Hi, This patchset allows vhost to be used with legacy virtio when guest and host have a different endianness. It is compatible with modern virtio and can be fully compiled out through kernel config. FWIW, I could flawlessly kexec/reboot guests from ppc64 to ppc64le and back. I could also migrate from a ppc64 to a ppc64le host and back. No regressions on x86 as expected. My experimental QEMU tree

Hi, This patchset allows vhost to be used with legacy virtio when guest and host have a different endianness. It is compatible with modern virtio and can be fully compiled out through kernel config. FWIW, I could flawlessly kexec/reboot guests from ppc64 to ppc64le and back. I could also migrate from a ppc64 to a ppc64le host and back. No regressions on x86 as expected. My experimental QEMU tree

Hi, This patchset allows vhost to be used with legacy virtio when guest and host have a different endianness. Patches 1-6 remain the same as the previous post. Patch 7 was heavily changed according to MST's comments. --- Greg Kurz (7): virtio: introduce virtio_is_little_endian() helper tun: add tun_is_little_endian() helper macvtap: introduce macvtap_is_little_endian()

Hi, This patchset allows vhost to be used with legacy virtio when guest and host have a different endianness. Patches 1-6 remain the same as the previous post. Patch 7 was heavily changed according to MST's comments. --- Greg Kurz (7): virtio: introduce virtio_is_little_endian() helper tun: add tun_is_little_endian() helper macvtap: introduce macvtap_is_little_endian()

Only cosmetic and documentation changes since v5. --- Greg Kurz (8): virtio: introduce virtio_is_little_endian() helper tun: add tun_is_little_endian() helper macvtap: introduce macvtap_is_little_endian() helper vringh: introduce vringh_is_little_endian() helper vhost: introduce vhost_is_little_endian() helper virtio: add explicit big-endian support to memory

Only cosmetic and documentation changes since v5. --- Greg Kurz (8): virtio: introduce virtio_is_little_endian() helper tun: add tun_is_little_endian() helper macvtap: introduce macvtap_is_little_endian() helper vringh: introduce vringh_is_little_endian() helper vhost: introduce vhost_is_little_endian() helper virtio: add explicit big-endian support to memory

Hi, This patchset allows vhost to be used with legacy virtio when guest and host have a different endianness. It is a complete rework of my initial post. Patches 1 to 5 are preliminary work: we move the endianness check out of all memory accessors to separate functions. Patch 6 changes the semantics of the accessors so that they have explicit big endian support. Patch 7 brings the cross-endian

Hi, This patchset allows vhost to be used with legacy virtio when guest and host have a different endianness. It is a complete rework of my initial post. Patches 1 to 5 are preliminary work: we move the endianness check out of all memory accessors to separate functions. Patch 6 changes the semantics of the accessors so that they have explicit big endian support. Patch 7 brings the cross-endian