Until 67915de9f0383ccf4a ("s390x/event-facility: variable-length event masks") we only supported 32bit sclp event masks, even though the archiecture allows the guests to set up sclp event masks up to 1021 bytes in length. With that patch the behaviour was almost compliant, but some issues were still remaining, in particular regarding the handling of selective reads and migration.
This patchset fixes migration and the handling of selective reads, and puts in place the support for 64-bit sclp event masks internally. A new property of the sclp-event device switches between the 32bit masks and the compliant behaviour. The property is bound to the machine version, so older machines keep the old broken behaviour, allowing for migration, but the default is the compliant implementation. Fixes: 67915de9f0383ccf4a ("s390x/event-facility: variable-length event masks") v3 -> v4 * removed all pre_load hooks * split the internal represntation of the receive mask into an array of uint32_t and added accessors; the union would not work on little endian hosts! * fixed the pre-existing documentation comment for copy_mask v2 -> v3 * fixed some typos in the first patch description * updated an existing comment in the third patch: newer Linux versions will support masks larger than 4 bytes. v1 -> v2 * improved comments and patch descriptions to better explain why we need this, including better description of the old broken behaviour * rename SCLPEVMSK to SCLP_EVMASK to improve readability * removed some unneded variable initializations * fixed a pre-existing typo Claudio Imbrenda (3): s390x/sclp: proper support of larger send and receive masks s390x/sclp: clean up sclp masks s390x/sclp: extend SCLP event masks to 64 bits hw/char/sclpconsole-lm.c | 4 +- hw/char/sclpconsole.c | 4 +- hw/s390x/event-facility.c | 153 ++++++++++++++++++++++++++++++-------- hw/s390x/s390-virtio-ccw.c | 8 +- hw/s390x/sclpcpu.c | 4 +- hw/s390x/sclpquiesce.c | 4 +- include/hw/s390x/event-facility.h | 22 +++--- 7 files changed, 148 insertions(+), 51 deletions(-) -- 2.7.4