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s390x/event-facility: variable-length event masks 

The architecture supports masks of variable length for sclp write
event mask. We currently only support 4 byte event masks, as that
is what Linux uses.

Let's extend this to the maximum mask length supported by the
architecture and return 0 to the guest for the mask bits we don't
support in core.

Initial patch by: Cornelia Huck <cornelia.huck@de.ibm.com>

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Jason J. Herne <jjherne@linux.vnet.ibm.com>
Message-Id: <1507729193-9747-1-git-send-email-jjherne@linux.vnet.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
stable-2.11
Cornelia Huck 2017-10-11 09:39:53 -04:00 committed by Cornelia Huck
parent 146bd283ff
commit 67915de9f0
2 changed files with 45 additions and 10 deletions
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35
hw/s390x/event-facility.c
View File

@ -259,23 +259,46 @@ out:
return;
}
/* copy up to dst_len bytes and fill the rest of dst with zeroes */
static void copy_mask(uint8_t *dst, uint8_t *src, uint16_t dst_len,
uint16_t src_len)
{
int i;
for (i = 0; i < dst_len; i++) {
dst[i] = i < src_len ? src[i] : 0;
}
}
static void write_event_mask(SCLPEventFacility *ef, SCCB *sccb)
{
WriteEventMask *we_mask = (WriteEventMask *) sccb;
uint16_t mask_length = be16_to_cpu(we_mask->mask_length);
uint32_t tmp_mask;
/* Attention: We assume that Linux uses 4-byte masks, what it actually
does. Architecture allows for masks of variable size, though */
if (be16_to_cpu(we_mask->mask_length) != 4) {
if (!mask_length || (mask_length > SCLP_EVENT_MASK_LEN_MAX)) {
sccb->h.response_code = cpu_to_be16(SCLP_RC_INVALID_MASK_LENGTH);
goto out;
}
/*
* 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.
*/
/* keep track of the guest's capability masks */
ef->receive_mask = be32_to_cpu(we_mask->cp_receive_mask);
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);
/* return the SCLP's capability masks to the guest */
we_mask->send_mask = cpu_to_be32(get_host_send_mask(ef));
we_mask->receive_mask = cpu_to_be32(get_host_receive_mask(ef));
tmp_mask = cpu_to_be32(get_host_send_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_receive_mask(ef));
copy_mask(WEM_SEND_MASK(we_mask, mask_length), (uint8_t *)&tmp_mask,
mask_length, sizeof(tmp_mask));
sccb->h.response_code = cpu_to_be16(SCLP_RC_NORMAL_COMPLETION);

20
include/hw/s390x/event-facility.h
View File

@ -49,16 +49,28 @@
#define TYPE_SCLP_CPU_HOTPLUG "sclp-cpu-hotplug"
#define TYPE_SCLP_QUIESCE "sclpquiesce"
#define SCLP_EVENT_MASK_LEN_MAX 1021
typedef struct WriteEventMask {
SCCBHeader h;
uint16_t _reserved;
uint16_t mask_length;
uint32_t cp_receive_mask;
uint32_t cp_send_mask;
uint32_t receive_mask;
uint32_t send_mask;
uint8_t masks[];
/*
* Layout of the masks is
* uint8_t cp_receive_mask[mask_length];
* uint8_t cp_send_mask[mask_length];
* uint8_t receive_mask[mask_length];
* uint8_t send_mask[mask_length];
* where 1 <= mask_length <= SCLP_EVENT_MASK_LEN_MAX
*/
} QEMU_PACKED WriteEventMask;
#define WEM_CP_RECEIVE_MASK(wem, mask_len) ((wem)->masks)
#define WEM_CP_SEND_MASK(wem, mask_len) ((wem)->masks + (mask_len))
#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 struct EventBufferHeader {
uint16_t length;
uint8_t type;