File 0162-scsi-make-io_timeout-settable.patch of Package qemu

Overview Repositories Revisions Requests Users Attributes Meta

File 0162-scsi-make-io_timeout-settable.patch of Package qemu

From: Hannes Reinecke <hare@suse.de>
Date: Thu, 29 Oct 2020 12:41:21 +0100
Subject: scsi: make io_timeout settable

References: bsc#1178049

Add an 'io_timeout' parameter for SCSIDevice to allow
SG_IO ioctls to pass in a timeout, avoiding infinite
guest stalls if the host needs to abort a command.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Bruce Rogers <brogers@suse.com>
---
 hw/scsi/scsi-disk.c    |  7 +++++--
 hw/scsi/scsi-generic.c | 15 +++++++++------
 include/hw/scsi/scsi.h |  3 ++-
 3 files changed, 16 insertions(+), 9 deletions(-)

diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
index 056c73cd8ef3ab9de6a53c116915..524f58ea0b26847569f22a419097 100644
--- a/hw/scsi/scsi-disk.c
+++ b/hw/scsi/scsi-disk.c
@@ -45,6 +45,7 @@
 
 #define DEFAULT_DISCARD_GRANULARITY (4 * KiB)
 #define DEFAULT_MAX_UNMAP_SIZE      (1 * GiB)
+#define DEFAULT_IO_TIMEOUT          UINT_MAX    /* Infinity */
 #define DEFAULT_MAX_IO_SIZE         INT_MAX     /* 2 GB - 1 block */
 
 #define TYPE_SCSI_DISK_BASE         "scsi-disk-base"
@@ -2538,7 +2539,7 @@ static int get_device_type(SCSIDiskState *s)
     cmd[4] = sizeof(buf);
 
     ret = scsi_SG_IO_FROM_DEV(s->qdev.conf.blk, cmd, sizeof(cmd),
-                              buf, sizeof(buf));
+                              buf, sizeof(buf), s->qdev.io_timeout);
     if (ret < 0) {
         return -1;
     }
@@ -2692,7 +2693,7 @@ static BlockAIOCB *scsi_block_do_sgio(SCSIBlockReq *req,
     /* The rest is as in scsi-generic.c.  */
     io_header->mx_sb_len = sizeof(r->req.sense);
     io_header->sbp = r->req.sense;
-    io_header->timeout = UINT_MAX;
+    io_header->timeout = s->qdev.io_timeout;
     io_header->usr_ptr = r;
     io_header->flags |= SG_FLAG_DIRECT_IO;
 
@@ -3006,6 +3007,8 @@ static Property scsi_block_properties[] = {
                        DEFAULT_MAX_IO_SIZE),
     DEFINE_PROP_INT32("scsi_version", SCSIDiskState, qdev.default_scsi_version,
                       -1),
+    DEFINE_PROP_UINT32("io_timeout", SCSIDiskState, qdev.io_timeout,
+                       DEFAULT_IO_TIMEOUT),
     DEFINE_PROP_END_OF_LIST(),
 };
 
diff --git a/hw/scsi/scsi-generic.c b/hw/scsi/scsi-generic.c
index d82b462be40d656fd9def2b7f2b7..802071b117ffb89ee12b15f5719b 100644
--- a/hw/scsi/scsi-generic.c
+++ b/hw/scsi/scsi-generic.c
@@ -111,6 +111,8 @@ static int execute_command(BlockBackend *blk,
                            SCSIGenericReq *r, int direction,
                            BlockCompletionFunc *complete)
 {
+    SCSIDevice *s = r->req.dev;
+
     r->io_header.interface_id = 'S';
     r->io_header.dxfer_direction = direction;
     r->io_header.dxferp = r->buf;
@@ -119,7 +121,7 @@ static int execute_command(BlockBackend *blk,
     r->io_header.cmd_len = r->req.cmd.len;
     r->io_header.mx_sb_len = sizeof(r->req.sense);
     r->io_header.sbp = r->req.sense;
-    r->io_header.timeout = MAX_UINT;
+    r->io_header.timeout = s->io_timeout;
     r->io_header.usr_ptr = r;
     r->io_header.flags |= SG_FLAG_DIRECT_IO;
 
@@ -496,7 +498,7 @@ static int read_naa_id(const uint8_t *p, uint64_t *p_wwn)
 }
 
 int scsi_SG_IO_FROM_DEV(BlockBackend *blk, uint8_t *cmd, uint8_t cmd_size,
-                        uint8_t *buf, uint8_t buf_size)
+                        uint8_t *buf, uint8_t buf_size, uint32_t timeout)
 {
     sg_io_hdr_t io_header;
     uint8_t sensebuf[8];
@@ -511,7 +513,7 @@ int scsi_SG_IO_FROM_DEV(BlockBackend *blk, uint8_t *cmd, uint8_t cmd_size,
     io_header.cmd_len = cmd_size;
     io_header.mx_sb_len = sizeof(sensebuf);
     io_header.sbp = sensebuf;
-    io_header.timeout = 6000; /* XXX */
+    io_header.timeout = timeout;
 
     ret = blk_ioctl(blk, SG_IO, &io_header);
     if (ret < 0 || io_header.driver_status || io_header.host_status) {
@@ -541,7 +543,7 @@ static void scsi_generic_set_vpd_bl_emulation(SCSIDevice *s)
     cmd[4] = sizeof(buf);
 
     ret = scsi_SG_IO_FROM_DEV(s->conf.blk, cmd, sizeof(cmd),
-                              buf, sizeof(buf));
+                              buf, sizeof(buf), s->io_timeout);
     if (ret < 0) {
         /*
          * Do not assume anything if we can't retrieve the
@@ -577,7 +579,7 @@ static void scsi_generic_read_device_identification(SCSIDevice *s)
     cmd[4] = sizeof(buf);
 
     ret = scsi_SG_IO_FROM_DEV(s->conf.blk, cmd, sizeof(cmd),
-                              buf, sizeof(buf));
+                              buf, sizeof(buf), s->io_timeout);
     if (ret < 0) {
         return;
     }
@@ -628,7 +630,7 @@ static int get_stream_blocksize(BlockBackend *blk)
     cmd[0] = MODE_SENSE;
     cmd[4] = sizeof(buf);
 
-    ret = scsi_SG_IO_FROM_DEV(blk, cmd, sizeof(cmd), buf, sizeof(buf));
+    ret = scsi_SG_IO_FROM_DEV(blk, cmd, sizeof(cmd), buf, sizeof(buf), 60);
     if (ret < 0) {
         return -1;
     }
@@ -718,6 +720,7 @@ static void scsi_generic_realize(SCSIDevice *s, Error **errp)
 
     /* Only used by scsi-block, but initialize it nevertheless to be clean.  */
     s->default_scsi_version = -1;
+    s->io_timeout = 30000;
     scsi_generic_read_device_inquiry(s);
 }
 
diff --git a/include/hw/scsi/scsi.h b/include/hw/scsi/scsi.h
index acef25faa4b130113160bef4868e..93f4139ae5f6b275bb219440e0e1 100644
--- a/include/hw/scsi/scsi.h
+++ b/include/hw/scsi/scsi.h
@@ -87,6 +87,7 @@ struct SCSIDevice
     uint64_t port_wwn;
     int scsi_version;
     int default_scsi_version;
+    uint32_t io_timeout;
     bool needs_vpd_bl_emulation;
 };
 
@@ -190,7 +191,7 @@ void scsi_device_unit_attention_reported(SCSIDevice *dev);
 void scsi_generic_read_device_inquiry(SCSIDevice *dev);
 int scsi_device_get_sense(SCSIDevice *dev, uint8_t *buf, int len, bool fixed);
 int scsi_SG_IO_FROM_DEV(BlockBackend *blk, uint8_t *cmd, uint8_t cmd_size,
-                        uint8_t *buf, uint8_t buf_size);
+                        uint8_t *buf, uint8_t buf_size, uint32_t timeout);
 SCSIDevice *scsi_device_find(SCSIBus *bus, int channel, int target, int lun);
 
 /* scsi-generic.c. */

Places

File 0162-scsi-make-io_timeout-settable.patch of Package qemu

Places