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On Fri, Feb 23, 2018 at 07:18:00PM +0800, Tiwei Bie wrote: >Signed-off-by: Tiwei Bie <tiwei.bie at intel.com> >--- > include/uapi/linux/virtio_config.h | 18 +++++++++- > include/uapi/linux/virtio_ring.h | 68 ++++++++++++++++++++++++++++++++++++++ > 2 files changed, 85 insertions(+), 1 deletion(-) > >diff --git a/include/uapi/linux/virtio_config.h

Virtio BoF minutes KVM Forum 2017 Attendees: Amnon Ilan, Maxime Coqueline, Vlad Yasevich, Malcolm Crossley, David Vrabel, Ilya Lesokhin, Cunming Lian, Jens Freimann Topics: packed ring layout with respect to hardware implementations References: https://lists.oasis-open.org/archives/virtio-dev/201702/msg00010.html https://lists.oasis-open.org/archives/virtio-dev/201709/msg00013.html Malcolm Crossley, David Vrabel: - keep in mind not to only optimize for ne...

Virtio BoF minutes KVM Forum 2017 Attendees: Amnon Ilan, Maxime Coqueline, Vlad Yasevich, Malcolm Crossley, David Vrabel, Ilya Lesokhin, Cunming Lian, Jens Freimann Topics: packed ring layout with respect to hardware implementations References: https://lists.oasis-open.org/archives/virtio-dev/201702/msg00010.html https://lists.oasis-open.org/archives/virtio-dev/201709/msg00013.html Malcolm Crossley, David Vrabel: - keep in mind not to only optimize for ne...

On Sun, Oct 01, 2017 at 04:08:29AM +0000, Michael S. Tsirkin wrote: >On Thu, Sep 28, 2017 at 09:44:35AM +0000, Liang, Cunming wrote: >> >> Get it now. Please correct me if I missing something. >> >> >> Flags status hints, >> >> - DESC_DRIVER only: driver owns the descriptor w/o available info ready for device to use >> >> - DESC_DRIVER |

On Sun, Oct 01, 2017 at 04:08:29AM +0000, Michael S. Tsirkin wrote: >On Thu, Sep 28, 2017 at 09:44:35AM +0000, Liang, Cunming wrote: >> >> Get it now. Please correct me if I missing something. >> >> >> Flags status hints, >> >> - DESC_DRIVER only: driver owns the descriptor w/o available info ready for device to use >> >> - DESC_DRIVER |

> -----Original Message----- > From: virtio-dev at lists.oasis-open.org [mailto:virtio-dev at lists.oasis-open.org] > On Behalf Of Michael S. Tsirkin > Sent: Wednesday, October 4, 2017 8:58 PM > To: Jens Freimann <jfreimann at redhat.com> > Cc: Liang, Cunming <cunming.liang at intel.com>; Steven Luong (sluong) > <sluong at cisco.com>; virtio-dev at lists.oasis-open.org; > virtualization at lists.linux-foundation.org > Subject: Re: [virtio-dev] packed ring layout proposal v3 &gt...

> -----Original Message----- > From: virtio-dev at lists.oasis-open.org [mailto:virtio-dev at lists.oasis-open.org] > On Behalf Of Michael S. Tsirkin > Sent: Wednesday, October 4, 2017 8:58 PM > To: Jens Freimann <jfreimann at redhat.com> > Cc: Liang, Cunming <cunming.liang at intel.com>; Steven Luong (sluong) > <sluong at cisco.com>; virtio-dev at lists.oasis-open.org; > virtualization at lists.linux-foundation.org > Subject: Re: [virtio-dev] packed ring layout proposal v3 &gt...

last kicked event index must be updated unconditionally: even if we don't need to kick, we do not want to re-check the same entry for events. Reported-by: Cornelia Huck <cohuck at redhat.com> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- tools/virtio/ringtest/virtio_ring_0_9.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git

On Sun, Oct 29, 2017 at 01:52:25PM +0100, Jens Freimann wrote: > Ilya: - you might have more completions than descriptors available > - partial descriptor chains are a problem for hardware because you might have > to read a bunch of conscriptors twice - how would you do deal with a big > buffer that cointains a large number of > small p...

last kicked event index must be updated unconditionally: even if we don't need to kick, we do not want to re-check the same entry for events. Reported-by: Cornelia Huck <cohuck at redhat.com> Signed-off-by: Michael S. Tsirkin <mst at redhat.com> --- tools/virtio/ringtest/virtio_ring_0_9.c | 24 ++++++++++++++---------- 1 file changed, 14 insertions(+), 10 deletions(-) diff --git

On Wednesday, November 01, 2017 4:59 PM, Michael S. Tsirkin wrote: > On Sun, Oct 29, 2017 at 01:52:25PM +0100, Jens Freimann wrote: > > Ilya: - you might have more completions than descriptors available > > - partial descriptor chains are a problem for hardware because you > > might have to read a bunch of conscriptors twice - how would you do > > deal with a big buffer that cointains a large num...

On Wednesday, November 01, 2017 4:59 PM, Michael S. Tsirkin wrote: > On Sun, Oct 29, 2017 at 01:52:25PM +0100, Jens Freimann wrote: > > Ilya: - you might have more completions than descriptors available > > - partial descriptor chains are a problem for hardware because you > > might have to read a bunch of conscriptors twice - how would you do > > deal with a big buffer that cointains a large num...

On Wed, Oct 04, 2017 at 02:39:01PM +0200, Jens Freimann wrote: > On Sun, Oct 01, 2017 at 04:08:29AM +0000, Michael S. Tsirkin wrote: > > On Thu, Sep 28, 2017 at 09:44:35AM +0000, Liang, Cunming wrote: > > > > > > Get it now. Please correct me if I missing something. > > > > > > > > > Flags status...

vring_create_virtqueue() allows the caller to specify via the may_reduce_num parameter whether the vring code is allowed to allocate a smaller ring than specified. However, the split ring allocation code tries to allocate a smaller ring on allocation failure regardless of what the caller specified. This may cause trouble for e.g. virtio-pci in legacy mode, which does not support ring resizing.

On Wed, Nov 01, 2017 at 03:52:12PM +0000, Ilya Lesokhin wrote: > On Wednesday, November 01, 2017 4:59 PM, Michael S. Tsirkin wrote: > > > On Sun, Oct 29, 2017 at 01:52:25PM +0100, Jens Freimann wrote: > > > Ilya: - you might have more completions than descriptors available > > > - partial descriptor chains are a problem for hardware because you > > > might have to read a bunch of conscriptors twice - how would you do > > > deal with a big buffer that c...

...Jani Kokkonen <jani.kokkonen@huawei.com> Jason Baron <jbaron@redhat.com> Jason J. Herne <jjherne@us.ibm.com> Jason Wang <jasowang> Jason Wang <jasowang@redhat.com> Jean-Christophe DUBOIS <jcd@tribudubois.net> Jeff Cody <jcody@redhat.com> Jens Freimann <jfrei@linux.vnet.ibm.com> Jesse Larrew <jlarrew@linux.vnet.ibm.com> Jia Liu <proljc@gmail.com> Jia Liu <proljc@gmail.com> (for openrisc) Jim Meyering <meyering@redhat.com> John Rigby <john.rigby@linaro.org> John Spencer <maillist-qemu@barfooze.de&...

...Jani Kokkonen <jani.kokkonen@huawei.com> Jason Baron <jbaron@redhat.com> Jason J. Herne <jjherne@us.ibm.com> Jason Wang <jasowang> Jason Wang <jasowang@redhat.com> Jean-Christophe DUBOIS <jcd@tribudubois.net> Jeff Cody <jcody@redhat.com> Jens Freimann <jfrei@linux.vnet.ibm.com> Jesse Larrew <jlarrew@linux.vnet.ibm.com> Jia Liu <proljc@gmail.com> Jia Liu <proljc@gmail.com> (for openrisc) Jim Meyering <meyering@redhat.com> John Rigby <john.rigby@linaro.org> John Spencer <maillist-qemu@barfooze.de&...

...Jani Kokkonen <jani.kokkonen@huawei.com> Jason Baron <jbaron@redhat.com> Jason J. Herne <jjherne@us.ibm.com> Jason Wang <jasowang> Jason Wang <jasowang@redhat.com> Jean-Christophe DUBOIS <jcd@tribudubois.net> Jeff Cody <jcody@redhat.com> Jens Freimann <jfrei@linux.vnet.ibm.com> Jesse Larrew <jlarrew@linux.vnet.ibm.com> Jia Liu <proljc@gmail.com> Jia Liu <proljc@gmail.com> (for openrisc) Jim Meyering <meyering@redhat.com> John Rigby <john.rigby@linaro.org> John Spencer <maillist-qemu@barfooze.de&...

...Jeffrey Huang <huangjw@broadcom.com> Jeffrin Jose <ahiliation@yahoo.co.in> Jenkins Jennifer Naumann <Jennifer.Naumann@informatik.stud.uni-erlangen.de> Jenny TC <jenny.tc@intel.com> Jens Axboe <axboe@kernel.dk> Jens Axboe <jaxboe@fusionio.com> Jens Freimann <jfrei@linux.vnet.ibm.com> Jens Rottmann <JRottmann@LiPPERTEmbedded.de> Jens Taprogge <jens.taprogge@taprogge.org> Jeongdo Son <sohn9086@gmail.com> Jeongtae Park <jtp.park@samsung.com> Jeremy Eder <jeder@redhat.com> Jeremy Fitzhardinge <jeremy.fitz...

...Jeffrey Huang <huangjw@broadcom.com> Jeffrin Jose <ahiliation@yahoo.co.in> Jenkins Jennifer Naumann <Jennifer.Naumann@informatik.stud.uni-erlangen.de> Jenny TC <jenny.tc@intel.com> Jens Axboe <axboe@kernel.dk> Jens Axboe <jaxboe@fusionio.com> Jens Freimann <jfrei@linux.vnet.ibm.com> Jens Rottmann <JRottmann@LiPPERTEmbedded.de> Jens Taprogge <jens.taprogge@taprogge.org> Jeongdo Son <sohn9086@gmail.com> Jeongtae Park <jtp.park@samsung.com> Jeremy Eder <jeder@redhat.com> Jeremy Fitzhardinge <jeremy.fitz...