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scsi-disk: provide maximum transfer length 

The QEMU block layer has a limit of INT_MAX bytes per transfer.

Expose it in the block limits VPD page for both regular transfers
and WRITE SAME.

Reported-by: Ming Lei <ming.lei@canonical.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2014-12-10 11:16:57 +01:00
parent 3c55fe2a13
commit f8e1f53334
1 changed files with 27 additions and 0 deletions
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27
hw/scsi/scsi-disk.c
View File

@ -49,6 +49,7 @@ do { printf("scsi-disk: " fmt , ## __VA_ARGS__); } while (0)
#define DEFAULT_DISCARD_GRANULARITY 4096
#define DEFAULT_MAX_UNMAP_SIZE (1 << 30) /* 1 GB */
#define DEFAULT_MAX_IO_SIZE INT_MAX /* 2 GB - 1 block */
typedef struct SCSIDiskState SCSIDiskState;
@ -79,6 +80,7 @@ struct SCSIDiskState
uint64_t port_wwn;
uint16_t port_index;
uint64_t max_unmap_size;
uint64_t max_io_size;
QEMUBH *bh;
char *version;
char *serial;
@ -635,6 +637,8 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
s->qdev.conf.opt_io_size / s->qdev.blocksize;
unsigned int max_unmap_sectors =
s->max_unmap_size / s->qdev.blocksize;
unsigned int max_io_sectors =
s->max_io_size / s->qdev.blocksize;
if (s->qdev.type == TYPE_ROM) {
DPRINTF("Inquiry (EVPD[%02X] not supported for CDROM\n",
@ -651,6 +655,12 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
outbuf[6] = (min_io_size >> 8) & 0xff;
outbuf[7] = min_io_size & 0xff;
/* maximum transfer length */
outbuf[8] = (max_io_sectors >> 24) & 0xff;
outbuf[9] = (max_io_sectors >> 16) & 0xff;
outbuf[10] = (max_io_sectors >> 8) & 0xff;
outbuf[11] = max_io_sectors & 0xff;
/* optimal transfer length */
outbuf[12] = (opt_io_size >> 24) & 0xff;
outbuf[13] = (opt_io_size >> 16) & 0xff;
@ -674,6 +684,17 @@ static int scsi_disk_emulate_inquiry(SCSIRequest *req, uint8_t *outbuf)
outbuf[29] = (unmap_sectors >> 16) & 0xff;
outbuf[30] = (unmap_sectors >> 8) & 0xff;
outbuf[31] = unmap_sectors & 0xff;
/* max write same size */
outbuf[36] = 0;
outbuf[37] = 0;
outbuf[38] = 0;
outbuf[39] = 0;
outbuf[40] = (max_io_sectors >> 24) & 0xff;
outbuf[41] = (max_io_sectors >> 16) & 0xff;
outbuf[42] = (max_io_sectors >> 8) & 0xff;
outbuf[43] = max_io_sectors & 0xff;
break;
}
case 0xb2: /* thin provisioning */
@ -2579,6 +2600,8 @@ static Property scsi_hd_properties[] = {
DEFINE_PROP_UINT16("port_index", SCSIDiskState, port_index, 0),
DEFINE_PROP_UINT64("max_unmap_size", SCSIDiskState, max_unmap_size,
DEFAULT_MAX_UNMAP_SIZE),
DEFINE_PROP_UINT64("max_io_size", SCSIDiskState, max_io_size,
DEFAULT_MAX_IO_SIZE),
DEFINE_BLOCK_CHS_PROPERTIES(SCSIDiskState, qdev.conf),
DEFINE_PROP_END_OF_LIST(),
};
@ -2625,6 +2648,8 @@ static Property scsi_cd_properties[] = {
DEFINE_PROP_UINT64("wwn", SCSIDiskState, wwn, 0),
DEFINE_PROP_UINT64("port_wwn", SCSIDiskState, port_wwn, 0),
DEFINE_PROP_UINT16("port_index", SCSIDiskState, port_index, 0),
DEFINE_PROP_UINT64("max_io_size", SCSIDiskState, max_io_size,
DEFAULT_MAX_IO_SIZE),
DEFINE_PROP_END_OF_LIST(),
};
@ -2690,6 +2715,8 @@ static Property scsi_disk_properties[] = {
DEFINE_PROP_UINT16("port_index", SCSIDiskState, port_index, 0),
DEFINE_PROP_UINT64("max_unmap_size", SCSIDiskState, max_unmap_size,
DEFAULT_MAX_UNMAP_SIZE),
DEFINE_PROP_UINT64("max_io_size", SCSIDiskState, max_io_size,
DEFAULT_MAX_IO_SIZE),
DEFINE_PROP_END_OF_LIST(),
};