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| author |   Eric Farman <farman@linux.ibm.com> | 2019-06-18 22:23:48 +0200 |
|---|---|---|
| committer |   Cornelia Huck <cohuck@redhat.com> | 2019-06-21 14:12:19 +0200 |
| commit | 1d897e478da3db91593d86227854802102e2fcd3 (patch) | |
| tree | fca71d80651b7f6a957737e09b1ed6649d248d18 /drivers/s390/cio/css.h | |
| parent | s390/cio: Combine direct and indirect CCW paths (diff) | |
| download | linux-dev-1d897e478da3db91593d86227854802102e2fcd3.tar.xz linux-dev-1d897e478da3db91593d86227854802102e2fcd3.zip | |
vfio-ccw: Move guest_cp storage into common struct
Rather than allocating/freeing a piece of memory every time
we try to figure out how long a CCW chain is, let's use a piece
of memory allocated for each device.
The io_mutex added with commit 4f76617378ee9 ("vfio-ccw: protect
the I/O region") is held for the duration of the VFIO_CCW_EVENT_IO_REQ
event that accesses/uses this space, so there should be no race
concerns with another CPU attempting an (unexpected) SSCH for the
same device.
Suggested-by: Cornelia Huck <cohuck@redhat.com>
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Message-Id: <20190618202352.39702-2-farman@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'drivers/s390/cio/css.h')
0 files changed, 0 insertions, 0 deletions