From 740842c9656cd5dbc9ccf2ea0c3a74f0ba35144a Mon Sep 17 00:00:00 2001 From: Daniel Henrique Barboza Date: Wed, 11 Jul 2018 17:58:13 -0300 Subject: scsi-disk: Block Device Characteristics emulation fix The current BDC VPD page (page 0xb1) is too short. This can be seen running sg_utils: $ sg_vpd --page=bdc /dev/sda Block device characteristics VPD page (SBC): Block device characteristics VPD page length too short=8 By the SCSI spec, the expected size of the SBC page is 0x40. There is no telling how the guest will behave with a shorter message - it can ignore it, or worse, make (wrong) assumptions. This patch fixes the emulation by setting the size to 0x40. This is the output of the previous sg_vpd command after applying it: $ sg_vpd --page=bdc /dev/sda -v inquiry cdb: 12 01 b1 00 fc 00 Block device characteristics VPD page (SBC): [PQual=0 Peripheral device type: disk] Medium rotation rate is not reported Product type: Not specified WABEREQ=0 WACEREQ=0 Nominal form factor not reported FUAB=0 VBULS=0 To improve readability, this patch also adds the VBULS value explictly and add comments on the existing fields we're setting. Signed-off-by: Daniel Henrique Barboza Acked-by: Paolo Bonzini Signed-off-by: Kevin Wolf --- hw/scsi/scsi-disk.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) (limited to 'hw/scsi/scsi-disk.c') diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c index d7df357..5bb3907 100644 --- a/hw/scsi/scsi-disk.c +++ b/hw/scsi/scsi-disk.c @@ -775,11 +775,12 @@ int scsi_disk_emulate_vpd_page(SCSIRequest *req, uint8_t *outbuf) } case 0xb1: /* block device characteristics */ { - buflen = 8; + buflen = 0x40; outbuf[4] = (s->rotation_rate >> 8) & 0xff; outbuf[5] = s->rotation_rate & 0xff; - outbuf[6] = 0; - outbuf[7] = 0; + outbuf[6] = 0; /* PRODUCT TYPE */ + outbuf[7] = 0; /* WABEREQ | WACEREQ | NOMINAL FORM FACTOR */ + outbuf[8] = 0; /* VBULS */ break; } case 0xb2: /* thin provisioning */ -- cgit v1.1