Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 1326259

Summary: [Q35] Disk didn't be found in guest when the connected to downstream as PCIe virtio devices
Product: Red Hat Enterprise Linux 7 Reporter: jingzhao <jinzhao>
Component: qemu-kvm-rhevAssignee: Fam Zheng <famz>
Status: CLOSED DUPLICATE QA Contact: Virtualization Bugs <virt-bugs>
Severity: high Docs Contact:
Priority: unspecified    
Version: 7.3CC: chayang, juzhang, knoel, virt-maint, xfu, yanyang
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2016-06-27 04:41:49 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:

Description jingzhao 2016-04-12 09:35:34 UTC 
Description of problem:
Disk didn't be found in guest when the connected to downstream as  PCIe virtio devices

Version-Release number of selected component (if applicable):
kernel-3.10.0-373.el7.x86_64
qemu-img-rhev-2.5.0-4.el7.x86_64
seabios-1.9.1-2.el7.x86_64

How reproducible:
3/3

Steps to Reproduce:
1.Boot guest with following cli:

/usr/libexec/qemu-kvm \
-M q35 \
-cpu SandyBridge \
-nodefaults -rtc base=utc \
-m 4G \
-smp 2,sockets=2,cores=1,threads=1 \
-enable-kvm \
-name rhel6 \
-uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \
-smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67170 \
-k en-us \
-monitor stdio \
-serial unix:/tmp/serial0,server,nowait \
-boot menu=on \
-bios /usr/share/seabios/bios.bin \
-vga std \
-vnc :0 \
-drive file=/home/rhel.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop,aio=threads \
-device virtio-blk-pci,bus=pcie.0,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=0 \
-device ioh3420,bus=pcie.0,id=root.0,slot=4 \
-device x3130-upstream,bus=root.0,id=upstream1 \
-device xio3130-downstream,bus=upstream1,id=downstream1,chassis=1 \
-device xio3130-downstream,bus=upstream1,id=downstream2,chassis=2 \
-netdev tap,id=hostnet1,vhost=on \
-device virtio-net-pci,netdev=hostnet1,id=net1,mac=54:52:00:B6:40:22,bus=pcie.0 \
-drive file=/home/q35/test2.raw,if=none,id=drive-virtio-disk3,format=raw,cache=none,werror=stop,rerror=stop,aio=threads \
-device virtio-blk-pci,bus=downstream1,drive=drive-virtio-disk3,id=virtio-disk3,disable-modern=off,disable-legacy=on \
-drive file=/home/q35/test1.raw,if=none,id=drive-virtio-disk4,format=raw,cache=none,werror=stop,rerror=stop,aio=threads \
-device virtio-blk-pci,bus=downstream2,drive=drive-virtio-disk4,id=virtio-disk4,disable-modern=off,disable-legacy=on \


2. Check the block device in hmp and can be found
(qemu) info block
drive-virtio-disk0 (#block104): /home/rhel.img (qcow2)
    Cache mode:       writeback, direct

drive-virtio-disk3 (#block318): /home/q35/test2.raw (raw)
    Cache mode:       writeback, direct

drive-virtio-disk4 (#block561): /home/q35/test1.raw (raw)
    Cache mode:       writeback, direct

3. In guest, check the block device through "fdisk -l"

Actual results:
Didn't found the disk in guest through "fdisk -l"
[root@localhost ~]# fdisk -l

Disk /dev/vda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000aae7a

   Device Boot      Start         End      Blocks   Id  System
/dev/vda1   *        2048     1026047      512000   83  Linux
/dev/vda2         1026048    41943039    20458496   8e  Linux LVM

Disk /dev/mapper/rhel-root: 18.8 GB, 18756927488 bytes, 36634624 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Disk /dev/mapper/rhel-swap: 2147 MB, 2147483648 bytes, 4194304 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes


Expected results:
Disk can found in guest

Additional info:
Disk can be found if deleted the parameter "disable-modern=off,disable-legacy=on" in the qemu command
Comment 2 jingzhao 2016-05-04 05:57:24 UTC 
Hit the issue when hot-plug virtio-scsi devices with downstream, following is the details:

kernel-3.10.0-388.el7.x86_64
qemu-kvm-rhev-2.5.0-4.el7.x86_64
seabios-1.9.1-3.el7.x86_64

1. Boot guest with following cli:

/usr/libexec/qemu-kvm \
-M q35 \
-cpu SandyBridge \
-nodefaults -rtc base=utc \
-m 4G \
-smp 2,sockets=2,cores=1,threads=1 \
-enable-kvm \
-name rhel7 \
-uuid 990ea161-6b67-47b2-b803-19fb01d30d12 \
-smbios type=1,manufacturer='Red Hat',product='RHEV Hypervisor',version=el6,serial=koTUXQrb,uuid=feebc8fd-f8b0-4e75-abc3-e63fcdb67170 \
-k en-us \
-serial unix:/tmp/serial0,server,nowait \
-boot menu=on \
-bios /usr/share/seabios/bios.bin \
-vga std \
-vnc :0 \
-qmp tcp:0:6666,server,nowait \
-drive file=/home/rhel.img,if=none,id=drive-virtio-disk0,format=qcow2,cache=none,werror=stop,rerror=stop,aio=threads \
-device virtio-blk-pci,bus=pcie.0,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=0 \
-chardev file,path=/home/seabios.log,id=seabios \
-device isa-debugcon,chardev=seabios,iobase=0x402 \
-device ioh3420,bus=pcie.0,id=root.0,slot=1 \
-device x3130-upstream,bus=root.0,id=upstream1 \
-device xio3130-downstream,bus=upstream1,id=downstream1,chassis=1 \
-device xio3130-downstream,bus=upstream1,id=downstream2,chassis=2 \
-device virtio-scsi-pci,bus=downstream1,id=scsi_pci_bus0,disable-modern=off,disable-legacy=on \
-monitor stdio \

2. In qmp, hot-plug virtio-scsi disk 
{"execute":"__com.redhat_drive_add","arguments":{"file":"/home/q35/scsi.raw","format":"raw","id":"scsi-disk"}}
{"return": {}}
{"execute":"device_add","arguments":{"driver":"scsi-disk","drive":"scsi-disk","id":"cd1","bus":"scsi_pci_bus0.0"}}
{"return": {}}

3.In hmp, check the block
(qemu) info block
drive-virtio-disk0 (#block133): /home/rhel.img (qcow2)
    Cache mode:       writeback, direct

scsi-disk (#block398): /home/q35/scsi.raw (raw)
    Cache mode:       writebac

4. In guest, check the disk through "fdisk -l"

After step4, disk didn't be found in guest
Comment 3 Fam Zheng 2016-06-27 04:41:49 UTC 

*** This bug has been marked as a duplicate of bug 1330002 ***