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xemu/hw/scsi
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Paolo Bonzini cc07162953 block: introduce max_hw_iov for use in scsi-generic 
Linux limits the size of iovecs to 1024 (UIO_MAXIOV in the kernel
sources, IOV_MAX in POSIX).  Because of this, on some host adapters
requests with many iovecs are rejected with -EINVAL by the
io_submit() or readv()/writev() system calls.

In fact, the same limit applies to SG_IO as well.  To fix both the
EINVAL and the possible performance issues from using fewer iovecs
than allowed by Linux (some HBAs have max_segments as low as 128),
introduce a separate entry in BlockLimits to hold the max_segments
value from sysfs.  This new limit is used only for SG_IO and clamped
to bs->bl.max_iov anyway, just like max_hw_transfer is clamped to
bs->bl.max_transfer.

Reported-by: Halil Pasic <pasic@linux.ibm.com>
Cc: Hanna Reitz <hreitz@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-block@nongnu.org
Cc: qemu-stable@nongnu.org
Fixes: 18473467d5 ("file-posix: try BLKSECTGET on block devices too, do not round to power of 2", 2021-06-25)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20210923130436.1187591-1-pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
2021-10-06 10:25:55 +02:00
..
emulation.c scsi-generic: avoid invalid access to struct when emulating block limits 2018-11-06 21:35:06 +01:00
esp-pci.c scsi: Replace scsi_bus_new() with scsi_bus_init(), scsi_bus_init_named() 2021-09-30 13:42:10 +01:00
esp.c scsi: Replace scsi_bus_new() with scsi_bus_init(), scsi_bus_init_named() 2021-09-30 13:42:10 +01:00
Kconfig hw/nvram/Kconfig: Add an entry for the NMC93xx EEPROM 2020-01-07 12:08:39 +01:00
lsi53c895a.c scsi: Replace scsi_bus_new() with scsi_bus_init(), scsi_bus_init_named() 2021-09-30 13:42:10 +01:00
megasas.c scsi: Replace scsi_bus_new() with scsi_bus_init(), scsi_bus_init_named() 2021-09-30 13:42:10 +01:00
meson.build meson: convert hw/scsi 2020-08-21 06:30:28 -04:00
mfi.h
mpi.h
mptconfig.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
mptendian.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
mptsas.c scsi: Replace scsi_bus_new() with scsi_bus_init(), scsi_bus_init_named() 2021-09-30 13:42:10 +01:00
mptsas.h mptsas: Remove unused MPTSASState 'pending' field (CVE-2021-3392) 2021-04-19 15:48:12 +01:00
scsi-bus.c qbus: Rename qbus_create_inplace() to qbus_init() 2021-09-30 13:42:10 +01:00
scsi-disk.c hw/scsi: Fix sector translation bug in scsi_unmap_complete_noio 2021-05-26 14:50:05 +02:00
scsi-generic.c block: introduce max_hw_iov for use in scsi-generic 2021-10-06 10:25:55 +02:00
spapr_vscsi.c scsi: Replace scsi_bus_new() with scsi_bus_init(), scsi_bus_init_named() 2021-09-30 13:42:10 +01:00
srp.h
trace-events esp: store lun coming from the MESSAGE OUT phase 2021-06-15 17:17:09 +02:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vhost-scsi-common.c vhost-scsi: support inflight io track 2020-09-30 19:09:20 +02:00
vhost-scsi.c vhost-scsi: Plug memory leak on migrate_add_blocker() failure 2021-08-26 17:15:28 +02:00
vhost-user-scsi.c vhost: Add Error parameter to vhost_dev_init() 2021-06-30 13:15:44 +02:00
viosrp.h hw/scsi/spapr_vscsi: Do not mix SRP IU size with DMA buffer size 2020-03-17 15:08:50 +11:00
virtio-scsi-dataplane.c virtio: Clarify MR transaction optimization 2021-07-02 11:13:39 -04:00
virtio-scsi.c scsi: Replace scsi_bus_new() with scsi_bus_init(), scsi_bus_init_named() 2021-09-30 13:42:10 +01:00
vmw_pvscsi.c scsi: Replace scsi_bus_new() with scsi_bus_init(), scsi_bus_init_named() 2021-09-30 13:42:10 +01:00
vmw_pvscsi.h