From: Cornelia Huck <cohuck@redhat.com> To: Halil Pasic <pasic@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Farhan Ali <alifm@linux.ibm.com>, Pierre Morel <pmorel@linux.ibm.com> Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, Cornelia Huck <cohuck@redhat.com>, Alex Williamson <alex.williamson@redhat.com>, qemu-devel@nongnu.org, qemu-s390x@nongnu.org Subject: [PATCH v2 0/5] vfio-ccw: support hsch/csch (kernel part) Date: Mon, 21 Jan 2019 12:03:49 +0100 [thread overview] Message-ID: <20190121110354.2247-1-cohuck@redhat.com> (raw) [This is the Linux kernel part, git tree is available at https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw.git vfio-ccw-eagain-caps The companion QEMU patches are available at https://github.com/cohuck/qemu vfio-ccw-caps] Currently, vfio-ccw only relays START SUBCHANNEL requests to the real device. This tends to work well for the most common 'good path' scenarios; however, as we emulate {HALT,CLEAR} SUBCHANNEL in QEMU, things like clearing pending requests at the device is currently not supported. This may be a problem for e.g. error recovery. This patch series introduces capabilities (similar to what vfio-pci uses) and exposes a new async region for handling hsch/csch. New in v2 are two patches dealing with concurrency. Lightly tested (I can interact with a dasd as before, and reserve/release seems to work well.) Not sure if there is a better way to test this, ideas welcome. Changes v1->v2: - New patch 1: make it safe to use the cp accessors at any time; this should avoid problems with unsolicited interrupt handling - New patch 2: handle concurrent accesses to the io region; the idea is to return -EAGAIN to userspace more often (so it can simply retry) - also handle concurrent accesses to the async io region - change VFIO_REGION_TYPE_CCW - merge events for halt and clear to a single async event; this turned out to make the code quite a bit simpler - probably some small changes I forgot to note down Cornelia Huck (5): vfio-ccw: make it safe to access channel programs vfio-ccw: concurrent I/O handling vfio-ccw: add capabilities chain s390/cio: export hsch to modules vfio-ccw: add handling for async channel instructions drivers/s390/cio/Makefile | 3 +- drivers/s390/cio/ioasm.c | 1 + drivers/s390/cio/vfio_ccw_async.c | 91 ++++++++++++ drivers/s390/cio/vfio_ccw_cp.c | 3 + drivers/s390/cio/vfio_ccw_cp.h | 2 + drivers/s390/cio/vfio_ccw_drv.c | 46 ++++-- drivers/s390/cio/vfio_ccw_fsm.c | 122 +++++++++++++++- drivers/s390/cio/vfio_ccw_ops.c | 211 +++++++++++++++++++++++----- drivers/s390/cio/vfio_ccw_private.h | 45 ++++++ include/uapi/linux/vfio.h | 4 + include/uapi/linux/vfio_ccw.h | 12 ++ 11 files changed, 487 insertions(+), 53 deletions(-) create mode 100644 drivers/s390/cio/vfio_ccw_async.c -- 2.17.2
WARNING: multiple messages have this Message-ID (diff)
From: Cornelia Huck <cohuck@redhat.com> To: Halil Pasic <pasic@linux.ibm.com>, Eric Farman <farman@linux.ibm.com>, Farhan Ali <alifm@linux.ibm.com>, Pierre Morel <pmorel@linux.ibm.com> Cc: linux-s390@vger.kernel.org, kvm@vger.kernel.org, qemu-devel@nongnu.org, qemu-s390x@nongnu.org, Alex Williamson <alex.williamson@redhat.com>, Cornelia Huck <cohuck@redhat.com> Subject: [Qemu-devel] [PATCH v2 0/5] vfio-ccw: support hsch/csch (kernel part) Date: Mon, 21 Jan 2019 12:03:49 +0100 [thread overview] Message-ID: <20190121110354.2247-1-cohuck@redhat.com> (raw) [This is the Linux kernel part, git tree is available at https://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw.git vfio-ccw-eagain-caps The companion QEMU patches are available at https://github.com/cohuck/qemu vfio-ccw-caps] Currently, vfio-ccw only relays START SUBCHANNEL requests to the real device. This tends to work well for the most common 'good path' scenarios; however, as we emulate {HALT,CLEAR} SUBCHANNEL in QEMU, things like clearing pending requests at the device is currently not supported. This may be a problem for e.g. error recovery. This patch series introduces capabilities (similar to what vfio-pci uses) and exposes a new async region for handling hsch/csch. New in v2 are two patches dealing with concurrency. Lightly tested (I can interact with a dasd as before, and reserve/release seems to work well.) Not sure if there is a better way to test this, ideas welcome. Changes v1->v2: - New patch 1: make it safe to use the cp accessors at any time; this should avoid problems with unsolicited interrupt handling - New patch 2: handle concurrent accesses to the io region; the idea is to return -EAGAIN to userspace more often (so it can simply retry) - also handle concurrent accesses to the async io region - change VFIO_REGION_TYPE_CCW - merge events for halt and clear to a single async event; this turned out to make the code quite a bit simpler - probably some small changes I forgot to note down Cornelia Huck (5): vfio-ccw: make it safe to access channel programs vfio-ccw: concurrent I/O handling vfio-ccw: add capabilities chain s390/cio: export hsch to modules vfio-ccw: add handling for async channel instructions drivers/s390/cio/Makefile | 3 +- drivers/s390/cio/ioasm.c | 1 + drivers/s390/cio/vfio_ccw_async.c | 91 ++++++++++++ drivers/s390/cio/vfio_ccw_cp.c | 3 + drivers/s390/cio/vfio_ccw_cp.h | 2 + drivers/s390/cio/vfio_ccw_drv.c | 46 ++++-- drivers/s390/cio/vfio_ccw_fsm.c | 122 +++++++++++++++- drivers/s390/cio/vfio_ccw_ops.c | 211 +++++++++++++++++++++++----- drivers/s390/cio/vfio_ccw_private.h | 45 ++++++ include/uapi/linux/vfio.h | 4 + include/uapi/linux/vfio_ccw.h | 12 ++ 11 files changed, 487 insertions(+), 53 deletions(-) create mode 100644 drivers/s390/cio/vfio_ccw_async.c -- 2.17.2
next reply other threads:[~2019-01-21 11:03 UTC|newest] Thread overview: 134+ messages / expand[flat|nested] mbox.gz Atom feed top 2019-01-21 11:03 Cornelia Huck [this message] 2019-01-21 11:03 ` [Qemu-devel] [PATCH v2 0/5] vfio-ccw: support hsch/csch (kernel part) Cornelia Huck 2019-01-21 11:03 ` [PATCH v2 1/5] vfio-ccw: make it safe to access channel programs Cornelia Huck 2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck 2019-01-22 14:56 ` Halil Pasic 2019-01-22 14:56 ` [Qemu-devel] " Halil Pasic 2019-01-22 15:19 ` Cornelia Huck 2019-01-22 15:19 ` [Qemu-devel] " Cornelia Huck 2019-01-21 11:03 ` [PATCH v2 2/5] vfio-ccw: concurrent I/O handling Cornelia Huck 2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck 2019-01-21 20:20 ` Halil Pasic 2019-01-21 20:20 ` [Qemu-devel] " Halil Pasic 2019-01-22 10:29 ` Cornelia Huck 2019-01-22 10:29 ` [Qemu-devel] " Cornelia Huck 2019-01-22 11:17 ` Halil Pasic 2019-01-22 11:17 ` [Qemu-devel] " Halil Pasic 2019-01-22 11:53 ` Cornelia Huck 2019-01-22 11:53 ` [Qemu-devel] " Cornelia Huck 2019-01-22 12:46 ` Halil Pasic 2019-01-22 12:46 ` [Qemu-devel] " Halil Pasic 2019-01-22 17:26 ` Cornelia Huck 2019-01-22 17:26 ` [Qemu-devel] " Cornelia Huck 2019-01-22 19:03 ` Halil Pasic 2019-01-22 19:03 ` [Qemu-devel] " Halil Pasic 2019-01-23 10:34 ` Cornelia Huck 2019-01-23 10:34 ` [Qemu-devel] " Cornelia Huck 2019-01-23 13:06 ` Halil Pasic 2019-01-23 13:06 ` [Qemu-devel] " Halil Pasic 2019-01-23 13:34 ` Cornelia Huck 2019-01-23 13:34 ` [Qemu-devel] " Cornelia Huck 2019-01-24 19:16 ` Eric Farman 2019-01-24 19:16 ` [Qemu-devel] " Eric Farman 2019-01-25 10:13 ` Cornelia Huck 2019-01-25 10:13 ` [Qemu-devel] " Cornelia Huck 2019-01-22 18:33 ` Halil Pasic 2019-01-22 18:33 ` [Qemu-devel] " Halil Pasic 2019-01-23 10:21 ` Cornelia Huck 2019-01-23 10:21 ` [Qemu-devel] " Cornelia Huck 2019-01-23 13:30 ` Halil Pasic 2019-01-23 13:30 ` [Qemu-devel] " Halil Pasic 2019-01-24 10:05 ` Cornelia Huck 2019-01-24 10:05 ` [Qemu-devel] " Cornelia Huck 2019-01-24 10:08 ` Pierre Morel 2019-01-24 10:08 ` [Qemu-devel] " Pierre Morel 2019-01-24 10:19 ` Cornelia Huck 2019-01-24 10:19 ` [Qemu-devel] " Cornelia Huck 2019-01-24 11:18 ` Pierre Morel 2019-01-24 11:18 ` [Qemu-devel] " Pierre Morel 2019-01-24 11:45 ` Halil Pasic 2019-01-24 11:45 ` [Qemu-devel] " Halil Pasic 2019-01-24 19:14 ` Eric Farman 2019-01-24 19:14 ` [Qemu-devel] " Eric Farman 2019-01-25 2:25 ` Eric Farman 2019-01-25 2:25 ` [Qemu-devel] " Eric Farman 2019-01-25 2:37 ` Eric Farman 2019-01-25 2:37 ` [Qemu-devel] " Eric Farman 2019-01-25 10:24 ` Cornelia Huck 2019-01-25 10:24 ` [Qemu-devel] " Cornelia Huck 2019-01-25 12:58 ` Cornelia Huck 2019-01-25 12:58 ` [Qemu-devel] " Cornelia Huck 2019-01-25 14:01 ` Halil Pasic 2019-01-25 14:01 ` [Qemu-devel] " Halil Pasic 2019-01-25 14:21 ` Cornelia Huck 2019-01-25 14:21 ` [Qemu-devel] " Cornelia Huck 2019-01-25 16:04 ` Halil Pasic 2019-01-25 16:04 ` [Qemu-devel] " Halil Pasic 2019-01-28 17:13 ` Cornelia Huck 2019-01-28 17:13 ` [Qemu-devel] " Cornelia Huck 2019-01-28 19:30 ` Halil Pasic 2019-01-28 19:30 ` [Qemu-devel] " Halil Pasic 2019-01-29 9:58 ` Cornelia Huck 2019-01-29 9:58 ` [Qemu-devel] " Cornelia Huck 2019-01-29 19:39 ` Halil Pasic 2019-01-29 19:39 ` [Qemu-devel] " Halil Pasic 2019-01-30 13:29 ` Cornelia Huck 2019-01-30 13:29 ` [Qemu-devel] " Cornelia Huck 2019-01-30 14:32 ` Farhan Ali 2019-01-30 14:32 ` [Qemu-devel] " Farhan Ali 2019-01-28 17:09 ` Cornelia Huck 2019-01-28 17:09 ` [Qemu-devel] " Cornelia Huck 2019-01-28 19:15 ` Halil Pasic 2019-01-28 19:15 ` [Qemu-devel] " Halil Pasic 2019-01-28 21:48 ` Eric Farman 2019-01-28 21:48 ` [Qemu-devel] " Eric Farman 2019-01-29 10:20 ` Cornelia Huck 2019-01-29 10:20 ` [Qemu-devel] " Cornelia Huck 2019-01-29 14:14 ` Eric Farman 2019-01-29 14:14 ` [Qemu-devel] " Eric Farman 2019-01-29 18:53 ` Cornelia Huck 2019-01-29 18:53 ` [Qemu-devel] " Cornelia Huck 2019-01-29 10:10 ` Cornelia Huck 2019-01-29 10:10 ` [Qemu-devel] " Cornelia Huck 2019-01-25 15:57 ` Eric Farman 2019-01-25 15:57 ` [Qemu-devel] " Eric Farman 2019-01-28 17:24 ` Cornelia Huck 2019-01-28 17:24 ` [Qemu-devel] " Cornelia Huck 2019-01-28 21:50 ` Eric Farman 2019-01-28 21:50 ` [Qemu-devel] " Eric Farman 2019-01-25 20:22 ` Eric Farman 2019-01-25 20:22 ` [Qemu-devel] " Eric Farman 2019-01-28 17:31 ` Cornelia Huck 2019-01-28 17:31 ` [Qemu-devel] " Cornelia Huck 2019-01-25 13:09 ` Halil Pasic 2019-01-25 13:09 ` [Qemu-devel] " Halil Pasic 2019-01-25 12:58 ` Halil Pasic 2019-01-25 12:58 ` [Qemu-devel] " Halil Pasic 2019-01-25 20:21 ` Eric Farman 2019-01-25 20:21 ` [Qemu-devel] " Eric Farman 2019-01-21 11:03 ` [PATCH v2 3/5] vfio-ccw: add capabilities chain Cornelia Huck 2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck 2019-01-23 15:57 ` [qemu-s390x] " Halil Pasic 2019-01-23 15:57 ` [Qemu-devel] " Halil Pasic 2019-01-25 16:19 ` Eric Farman 2019-01-25 16:19 ` [Qemu-devel] " Eric Farman 2019-01-25 21:00 ` Eric Farman 2019-01-25 21:00 ` [Qemu-devel] " Eric Farman 2019-01-28 17:34 ` Cornelia Huck 2019-01-28 17:34 ` [Qemu-devel] " Cornelia Huck 2019-01-21 11:03 ` [PATCH v2 4/5] s390/cio: export hsch to modules Cornelia Huck 2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck 2019-01-22 15:21 ` [qemu-s390x] " Halil Pasic 2019-01-22 15:21 ` [Qemu-devel] " Halil Pasic 2019-01-21 11:03 ` [PATCH v2 5/5] vfio-ccw: add handling for async channel instructions Cornelia Huck 2019-01-21 11:03 ` [Qemu-devel] " Cornelia Huck 2019-01-23 15:51 ` Halil Pasic 2019-01-23 15:51 ` [Qemu-devel] " Halil Pasic 2019-01-24 10:06 ` Cornelia Huck 2019-01-24 10:06 ` [Qemu-devel] " Cornelia Huck 2019-01-24 10:37 ` Halil Pasic 2019-01-24 10:37 ` [Qemu-devel] " Halil Pasic 2019-01-25 21:00 ` Eric Farman 2019-01-25 21:00 ` [Qemu-devel] " Eric Farman 2019-01-28 17:40 ` Cornelia Huck 2019-01-28 17:40 ` [Qemu-devel] " Cornelia Huck
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