From 98e43b71b25330566d902fbdc8fe35041c2decbe Mon Sep 17 00:00:00 2001 From: Claudio Imbrenda Date: Thu, 8 Mar 2018 12:04:29 +0100 Subject: [PATCH] s390x/sclp: extend SCLP event masks to 64 bits Extend the SCLP event masks to 64 bits. Notice that using any of the new bits results in a state that cannot be migrated to an older version. Signed-off-by: Claudio Imbrenda Message-Id: <1520507069-22179-1-git-send-email-imbrenda@linux.vnet.ibm.com> Acked-by: Christian Borntraeger Signed-off-by: Cornelia Huck --- hw/s390x/event-facility.c | 50 ++++++++++++++++++++++++++++++++------- include/hw/s390x/event-facility.h | 2 +- 2 files changed, 42 insertions(+), 10 deletions(-) diff --git a/hw/s390x/event-facility.c b/hw/s390x/event-facility.c index 9c24bc6f7c..0dea6cccae 100644 --- a/hw/s390x/event-facility.c +++ b/hw/s390x/event-facility.c @@ -26,11 +26,23 @@ typedef struct SCLPEventsBus { BusState qbus; } SCLPEventsBus; +/* we need to save 32 bit chunks for compatibility */ +#ifdef HOST_WORDS_BIGENDIAN +#define RECV_MASK_LOWER 1 +#define RECV_MASK_UPPER 0 +#else /* little endian host */ +#define RECV_MASK_LOWER 0 +#define RECV_MASK_UPPER 1 +#endif + struct SCLPEventFacility { SysBusDevice parent_obj; SCLPEventsBus sbus; /* guest's receive mask */ - sccb_mask_t receive_mask; + union { + uint32_t receive_mask_pieces[2]; + sccb_mask_t receive_mask; + }; /* * when false, we keep the same broken, backwards compatible behaviour as * before, allowing only masks of size exactly 4; when true, we implement @@ -262,7 +274,7 @@ static void read_event_data(SCLPEventFacility *ef, SCCB *sccb) case SCLP_SELECTIVE_READ: copy_mask((uint8_t *)&sclp_active_selection_mask, (uint8_t *)&red->mask, sizeof(sclp_active_selection_mask), ef->mask_length); - sclp_active_selection_mask = be32_to_cpu(sclp_active_selection_mask); + sclp_active_selection_mask = be64_to_cpu(sclp_active_selection_mask); if (!sclp_cp_receive_mask || (sclp_active_selection_mask & ~sclp_cp_receive_mask)) { sccb->h.response_code = @@ -294,21 +306,22 @@ static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb) } /* - * Note: We currently only support masks up to 4 byte length; - * the remainder is filled up with zeroes. Linux uses - * a 4 byte mask length. + * Note: We currently only support masks up to 8 byte length; + * the remainder is filled up with zeroes. Older Linux + * kernels use a 4 byte mask length, newer ones can use both + * 8 or 4 depending on what is available on the host. */ /* keep track of the guest's capability masks */ copy_mask((uint8_t *)&tmp_mask, WEM_CP_RECEIVE_MASK(we_mask, mask_length), sizeof(tmp_mask), mask_length); - ef->receive_mask = be32_to_cpu(tmp_mask); + ef->receive_mask = be64_to_cpu(tmp_mask); /* return the SCLP's capability masks to the guest */ - tmp_mask = cpu_to_be32(get_host_receive_mask(ef)); + tmp_mask = cpu_to_be64(get_host_receive_mask(ef)); copy_mask(WEM_RECEIVE_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask, mask_length, sizeof(tmp_mask)); - tmp_mask = cpu_to_be32(get_host_send_mask(ef)); + tmp_mask = cpu_to_be64(get_host_send_mask(ef)); copy_mask(WEM_SEND_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask, mask_length, sizeof(tmp_mask)); @@ -369,6 +382,13 @@ static void command_handler(SCLPEventFacility *ef, SCCB *sccb, uint64_t code) } } +static bool vmstate_event_facility_mask64_needed(void *opaque) +{ + SCLPEventFacility *ef = opaque; + + return (ef->receive_mask & 0xFFFFFFFF) != 0; +} + static bool vmstate_event_facility_mask_length_needed(void *opaque) { SCLPEventFacility *ef = opaque; @@ -376,6 +396,17 @@ static bool vmstate_event_facility_mask_length_needed(void *opaque) return ef->allow_all_mask_sizes; } +static const VMStateDescription vmstate_event_facility_mask64 = { + .name = "vmstate-event-facility/mask64", + .version_id = 0, + .minimum_version_id = 0, + .needed = vmstate_event_facility_mask64_needed, + .fields = (VMStateField[]) { + VMSTATE_UINT32(receive_mask_pieces[RECV_MASK_LOWER], SCLPEventFacility), + VMSTATE_END_OF_LIST() + } +}; + static const VMStateDescription vmstate_event_facility_mask_length = { .name = "vmstate-event-facility/mask_length", .version_id = 0, @@ -392,10 +423,11 @@ static const VMStateDescription vmstate_event_facility = { .version_id = 0, .minimum_version_id = 0, .fields = (VMStateField[]) { - VMSTATE_UINT32(receive_mask, SCLPEventFacility), + VMSTATE_UINT32(receive_mask_pieces[RECV_MASK_UPPER], SCLPEventFacility), VMSTATE_END_OF_LIST() }, .subsections = (const VMStateDescription * []) { + &vmstate_event_facility_mask64, &vmstate_event_facility_mask_length, NULL } diff --git a/include/hw/s390x/event-facility.h b/include/hw/s390x/event-facility.h index 5698e5e96c..8b39a80bb9 100644 --- a/include/hw/s390x/event-facility.h +++ b/include/hw/s390x/event-facility.h @@ -73,7 +73,7 @@ typedef struct WriteEventMask { #define WEM_RECEIVE_MASK(wem, mask_len) ((wem)->masks + 2 * (mask_len)) #define WEM_SEND_MASK(wem, mask_len) ((wem)->masks + 3 * (mask_len)) -typedef uint32_t sccb_mask_t; +typedef uint64_t sccb_mask_t; typedef struct EventBufferHeader { uint16_t length; -- 2.11.4.GIT