search for: 096b857

...in the guest? Host can then keep using avail ring without changes, it will stay in cache. Something like the below for guest should do the trick (untested): Signed-off-by: Michael S. Tsirkin <mst at redhat.com> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 096b857..9363b50 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -91,6 +91,7 @@ struct vring_virtqueue { bool last_add_time_valid; ktime_t last_add_time; #endif + u16 *avail; /* Tokens for callbacks. */ void *data[]; @@ -236,7 +237,10 @@ static inline int virtqueu...

...in the guest? Host can then keep using avail ring without changes, it will stay in cache. Something like the below for guest should do the trick (untested): Signed-off-by: Michael S. Tsirkin <mst at redhat.com> diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 096b857..9363b50 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -91,6 +91,7 @@ struct vring_virtqueue { bool last_add_time_valid; ktime_t last_add_time; #endif + u16 *avail; /* Tokens for callbacks. */ void *data[]; @@ -236,7 +237,10 @@ static inline int virtqueu...

...ons in kernel is generally problematic, but can work in userspace. Waiting for a description of that. > > > > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > > > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > > index 096b857..9363b50 100644 > > --- a/drivers/virtio/virtio_ring.c > > +++ b/drivers/virtio/virtio_ring.c > > @@ -91,6 +91,7 @@ struct vring_virtqueue { > > bool last_add_time_valid; > > ktime_t last_add_time; > > #endif > > + u16 *avail; > > > > /...

...ons in kernel is generally problematic, but can work in userspace. Waiting for a description of that. > > > > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > > > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > > index 096b857..9363b50 100644 > > --- a/drivers/virtio/virtio_ring.c > > +++ b/drivers/virtio/virtio_ring.c > > @@ -91,6 +91,7 @@ struct vring_virtqueue { > > bool last_add_time_valid; > > ktime_t last_add_time; > > #endif > > + u16 *avail; > > > > /...

...or each vring_desc to be able to free the memory in detach_buf. --- drivers/virtio/virtio_ring.c | 9 +++++---- include/linux/virtio_config.h | 14 ++++++++++++++ 2 files changed, 19 insertions(+), 4 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 096b857..34a1d42 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -16,6 +16,7 @@ * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ +#include <linux/dma-mapping.h> #inclu...

...ld also benefit. Signed-off-by: Venkatesh Srinivas <venkateshs at google.com> --- drivers/virtio/virtio_ring.c | 46 ++++++++++++++++++++++++++++++++------------ 1 file changed, 34 insertions(+), 12 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 096b857..6262015 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -80,6 +80,12 @@ struct vring_virtqueue { /* Last used index we've seen. */ u16 last_used_idx; + /* Last written value to avail->flags */ + u16 avail_flags_shadow; + + /* Last written value to avail...

...ld also benefit. Signed-off-by: Venkatesh Srinivas <venkateshs at google.com> --- drivers/virtio/virtio_ring.c | 46 ++++++++++++++++++++++++++++++++------------ 1 file changed, 34 insertions(+), 12 deletions(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 096b857..6262015 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -80,6 +80,12 @@ struct vring_virtqueue { /* Last used index we've seen. */ u16 last_used_idx; + /* Last written value to avail->flags */ + u16 avail_flags_shadow; + + /* Last written value to avail...

...+---------+---+--+---+ | 0 | 1 | 2 | ... | 254 | 255 | rx desc ring +----+----+---+-------------+------+ > > Signed-off-by: Michael S. Tsirkin <mst at redhat.com> > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > index 096b857..9363b50 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -91,6 +91,7 @@ struct vring_virtqueue { > bool last_add_time_valid; > ktime_t last_add_time; > #endif > + u16 *avail; > > /* Tokens for callbacks. */ > void *data[...

...ml.org/lkml/2015/9/10/111 Does it help you as well? > --- > drivers/virtio/virtio_ring.c | 46 ++++++++++++++++++++++++++++++++------------ > 1 file changed, 34 insertions(+), 12 deletions(-) > > diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c > index 096b857..6262015 100644 > --- a/drivers/virtio/virtio_ring.c > +++ b/drivers/virtio/virtio_ring.c > @@ -80,6 +80,12 @@ struct vring_virtqueue { > /* Last used index we've seen. */ > u16 last_used_idx; > > + /* Last written value to avail->flags */ > + u16 avail_flags_sh...

This fixes up virtio tests, broken by recent changes to core. Michael S. Tsirkin (4): tools/virtio: fix build after 4.2 changes vhost: move features to core tools/virtio: propagate V=X to kernel build virtio: introduce avail cache drivers/vhost/vhost.h | 4 +++- tools/virtio/asm/barrier.h | 2 ++ tools/virtio/linux/export.h | 3 +++ tools/virtio/linux/kernel.h | 8

This fixes up virtio tests, broken by recent changes to core. Michael S. Tsirkin (4): tools/virtio: fix build after 4.2 changes vhost: move features to core tools/virtio: propagate V=X to kernel build virtio: introduce avail cache drivers/vhost/vhost.h | 4 +++- tools/virtio/asm/barrier.h | 2 ++ tools/virtio/linux/export.h | 3 +++ tools/virtio/linux/kernel.h | 8

From: "Edgar E. Iglesias" <edgar.iglesias at xilinx.com> I'm trying to run rpmsg and remoteproc on the ZynqMP (arm64) but I'm hitting a DMA/mm error. The issue was discussed here: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/333050.html Russel King pointed out that the arm64 is not doing anything wrong by returning vmapped memory (which is incompatible

From: "Edgar E. Iglesias" <edgar.iglesias at xilinx.com> I'm trying to run rpmsg and remoteproc on the ZynqMP (arm64) but I'm hitting a DMA/mm error. The issue was discussed here: http://lists.infradead.org/pipermail/linux-arm-kernel/2015-March/333050.html Russel King pointed out that the arm64 is not doing anything wrong by returning vmapped memory (which is incompatible

Hi all, this patch series introduces support for running Linux on top of Xen inside a virtual machine with virtio devices (nested virt scenario). The problem is that Linux virtio drivers use virt_to_phys to get the guest pseudo-physical addresses to pass to the backend, which doesn't work as expected on Xen. Switching the virtio drivers to the dma APIs (dma_alloc_coherent,

Hi all, this patch series introduces support for running Linux on top of Xen inside a virtual machine with virtio devices (nested virt scenario). The problem is that Linux virtio drivers use virt_to_phys to get the guest pseudo-physical addresses to pass to the backend, which doesn't work as expected on Xen. Switching the virtio drivers to the dma APIs (dma_alloc_coherent,

Hi: This is a new version of trying to enable tx interrupts for virtio-net. We used to try to avoid tx interrupts and orphan packets before transmission for virtio-net. This breaks socket accounting and can lead serveral other side effects e.g: - Several other functions which depends on socket accounting can not work correctly (e.g TCP Small Queue) - No tx completion which make BQL or packet

Hi: This is a new version of trying to enable tx interrupts for virtio-net. We used to try to avoid tx interrupts and orphan packets before transmission for virtio-net. This breaks socket accounting and can lead serveral other side effects e.g: - Several other functions which depends on socket accounting can not work correctly (e.g TCP Small Queue) - No tx completion which make BQL or packet