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This series is a new tentative to have cleaner cross-endian code. Patches 1/3 is new: it fixes a side-effect in case vhost_init_used() fails. Patch 2/3 comes from v1: it renames cross-endian helpers Patch 3/3 is new: it simply renames vhost_init_used() as suggested by Michael. --- Greg Kurz (3): vhost: fix error path in vhost_init_used() vhost: rename cross-endian helpers vhost: rename vhost_init_used()...

This series is a new tentative to have cleaner cross-endian code. Patches 1/3 is new: it fixes a side-effect in case vhost_init_used() fails. Patch 2/3 comes from v1: it renames cross-endian helpers Patch 3/3 is new: it simply renames vhost_init_used() as suggested by Michael. --- Greg Kurz (3): vhost: fix error path in vhost_init_used() vhost: rename cross-endian helpers vhost: rename vhost_init_used()...

...a different endianness than the host Both cases rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le is only needed when the backend is active, it was decided to set it at backend start. This is currently done in vhost_init_used()->vhost_init_is_le() but it obfuscates the core vhost code. This patch moves the is_le setup to a dedicated function that is called from the backend code. Note vhost_net is the only backend that can pass vq->private_data == NULL to vhost_init_used(), hence the "if (sock)" branch...

...a different endianness than the host Both cases rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le is only needed when the backend is active, it was decided to set it at backend start. This is currently done in vhost_init_used()->vhost_init_is_le() but it obfuscates the core vhost code. This patch moves the is_le setup to a dedicated function that is called from the backend code. Note vhost_net is the only backend that can pass vq->private_data == NULL to vhost_init_used(), hence the "if (sock)" branch...

On Wed, Jan 13, 2016 at 06:09:47PM +0100, Greg Kurz wrote: > The way vring endianness is being handled currently obfuscates > the code in vhost_init_used(). > > This patch tries to fix that by doing the following: > - move the the code that adjusts endianness to a dedicated helper > - export this helper so that backends explicitely call it > > No behaviour change. > > Signed-off-by: Greg Kurz <gkurz at linux.vnet.ibm....

On Wed, Jan 13, 2016 at 06:09:47PM +0100, Greg Kurz wrote: > The way vring endianness is being handled currently obfuscates > the code in vhost_init_used(). > > This patch tries to fix that by doing the following: > - move the the code that adjusts endianness to a dedicated helper > - export this helper so that backends explicitely call it > > No behaviour change. > > Signed-off-by: Greg Kurz <gkurz at linux.vnet.ibm....

...a different endianness than the host Both cases rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le is only needed when the backend is active, it was decided to set it at backend start. This is currently done in vhost_init_used()->vhost_init_is_le() but it obfuscates the core vhost code. This patch moves the is_le setup to a dedicated function that is called from the backend code. Note vhost_net is the only backend that can pass vq->private_data == NULL to vhost_init_used(), hence the "if (sock)" branch...

...a different endianness than the host Both cases rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le is only needed when the backend is active, it was decided to set it at backend start. This is currently done in vhost_init_used()->vhost_init_is_le() but it obfuscates the core vhost code. This patch moves the is_le setup to a dedicated function that is called from the backend code. Note vhost_net is the only backend that can pass vq->private_data == NULL to vhost_init_used(), hence the "if (sock)" branch...

On Wed, 10 Feb 2016 13:48:09 +0200 "Michael S. Tsirkin" <mst at redhat.com> wrote: > On Wed, Jan 13, 2016 at 06:09:47PM +0100, Greg Kurz wrote: > > The way vring endianness is being handled currently obfuscates > > the code in vhost_init_used(). > > > > This patch tries to fix that by doing the following: > > - move the the code that adjusts endianness to a dedicated helper > > - export this helper so that backends explicitely call it > > > > No behaviour change. > > > > Signed-off-by...

...s rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the > > VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le > > is only needed when the backend is active, it was decided to set it at > > backend start. > > > > This is currently done in vhost_init_used()->vhost_init_is_le() but it > > obfuscates the core vhost code. This patch moves the is_le setup to a > > dedicated function that is called from the backend code. > > > > Note vhost_net is the only backend that can pass vq->private_data == NULL to > > vhost_i...

...s rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the > > VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le > > is only needed when the backend is active, it was decided to set it at > > backend start. > > > > This is currently done in vhost_init_used()->vhost_init_is_le() but it > > obfuscates the core vhost code. This patch moves the is_le setup to a > > dedicated function that is called from the backend code. > > > > Note vhost_net is the only backend that can pass vq->private_data == NULL to > > vhost_i...

...s rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the > > VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le > > is only needed when the backend is active, it was decided to set it at > > backend start. > > > > This is currently done in vhost_init_used()->vhost_init_is_le() but it > > obfuscates the core vhost code. This patch moves the is_le setup to a > > dedicated function that is called from the backend code. > > > > Note vhost_net is the only backend that can pass vq->private_data == NULL to > > vhost_i...

...s rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the > > VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le > > is only needed when the backend is active, it was decided to set it at > > backend start. > > > > This is currently done in vhost_init_used()->vhost_init_is_le() but it > > obfuscates the core vhost code. This patch moves the is_le setup to a > > dedicated function that is called from the backend code. > > > > Note vhost_net is the only backend that can pass vq->private_data == NULL to > > vhost_i...

...host > > Both cases rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the > VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le > is only needed when the backend is active, it was decided to set it at > backend start. > > This is currently done in vhost_init_used()->vhost_init_is_le() but it > obfuscates the core vhost code. This patch moves the is_le setup to a > dedicated function that is called from the backend code. > > Note vhost_net is the only backend that can pass vq->private_data == NULL to > vhost_init_used(), hence the &qu...

...host > > Both cases rely on the VHOST_SET_FEATURES ioctl, but 2) also needs the > VHOST_SET_VRING_ENDIAN ioctl to be called by userspace. Since vq->is_le > is only needed when the backend is active, it was decided to set it at > backend start. > > This is currently done in vhost_init_used()->vhost_init_is_le() but it > obfuscates the core vhost code. This patch moves the is_le setup to a > dedicated function that is called from the backend code. > > Note vhost_net is the only backend that can pass vq->private_data == NULL to > vhost_init_used(), hence the &qu...

This series is a respin of the following patch: http://patchwork.ozlabs.org/patch/565921/ Patch 1 is preliminary work: it gives better names to the helpers that are involved in cross-endian support. Patch 2 is actually a v2 of the original patch. All devices now call a helper in the generic code, which DTRT according to vq->private_data, as suggested by Michael. --- Greg Kurz (2):

This series is a respin of the following patch: http://patchwork.ozlabs.org/patch/565921/ Patch 1 is preliminary work: it gives better names to the helpers that are involved in cross-endian support. Patch 2 is actually a v2 of the original patch. All devices now call a helper in the generic code, which DTRT according to vq->private_data, as suggested by Michael. --- Greg Kurz (2):

The way vring endianness is being handled currently obfuscates the code in vhost_init_used(). This patch tries to fix that by doing the following: - move the the code that adjusts endianness to a dedicated helper - export this helper so that backends explicitely call it No behaviour change. Signed-off-by: Greg Kurz <gkurz at linux.vnet.ibm.com> --- drivers/vhost/net.c |...

On Tue, Feb 16, 2016 at 03:54:18PM +0100, Greg Kurz wrote: > This series is a new tentative to have cleaner cross-endian code. > > Patches 1/3 is new: it fixes a side-effect in case vhost_init_used() fails. > > Patch 2/3 comes from v1: it renames cross-endian helpers > > Patch 3/3 is new: it simply renames vhost_init_used() as suggested by Michael. Is this on top of my tree? > --- > > Greg Kurz (3): > vhost: fix error path in vhost_init_used() > v...

...e changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index c90f437..6a40837 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -1038,6 +1038,7 @@ static int vhost_update_avail_event(struct vhost_virtqueue *vq, u16 avail_event) int vhost_init_used(struct vhost_virtqueue *vq) { + u16 last_used_idx; int r; if (!vq->private_data) return 0; @@ -1046,7 +1047,13 @@ int vhost_init_used(struct vhost_virtqueue *vq) if (r) return r; vq->signalled_used_valid = false; - return get_user(vq->last_used_idx, &vq->used->id...