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Bug 1094134 - Guest fail to boot with PCIE bridge where multiple PCIE blk devices are attached to its downstream ports
Summary: Guest fail to boot with PCIE bridge where multiple PCIE blk devices are attac...
Keywords:
Status: CLOSED DUPLICATE of bug 1272938
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: seabios
Version: 7.0
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: ---
Assignee: Marcel Apfelbaum
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On:
Blocks: 1113520 1227278
TreeView+ depends on / blocked
 
Reported: 2014-05-05 06:45 UTC by Shaolong Hu
Modified: 2015-12-22 15:26 UTC (History)
8 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2015-12-22 15:26:18 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Shaolong Hu 2014-05-05 06:45:56 UTC 
Description of problem:
----------------------------
Guest fail to boot with multiple PCIE downstream bridge behind one upstream bridge.


Version-Release number of selected component (if applicable):
-----------------------------------------------------------------
seabios-1.7.2.2-12.el7.x86_64
qemu-kvm-1.5.3-60.el7.x86_64


How reproducible:
--------------------
100%


Steps to Reproduce:
-----------------------
1. use following script:

#!/bin/sh

cli="$cli /usr/libexec/qemu-kvm -enable-kvm -M q35 -smp 4 -m 3G -usb -device usb-tablet,id=input0 -name RHEL-Server-7.0-64 -drive file=/root/RHEL-Server-6.5-32-virtio.qcow2,if=none,id=hd,format=qcow2,cache=none,werror=stop,rerror=stop -device virtio-scsi-pci,id=scsi0 -device scsi-hd,drive=hd,scsi-id=0,lun=0,id=scsi_image,bootindex=1 -netdev tap,script=/etc/qemu-ifup,id=netdev0 -device virtio-net-pci,netdev=netdev0,id=device-net0 -spice port=5931,disable-ticketing -vga qxl -monitor stdio -drive file=/root/disk/disk0.qcow2,format=qcow2,if=none,id=disk0 -device virtio-scsi-pci,id=disk0 -device scsi-hd,drive=disk0,scsi-id=0,lun=0 -boot menu=on"

for r in $(seq 1)
do

    cli="$cli -device ioh3420,bus=pcie.0,id=root.$r,slot=$r"
    cli="$cli -device x3130-upstream,bus=root.$r,id=upstream$r"
    echo upstream$r

    for k in $(seq 6)
    do
        cli="$cli -device xio3130-downstream,bus=upstream$r,id=downstream$(((r-1)*15+k)),chassis=$(((r-1)*15+k-1))"
        cli="$cli -drive file=/root/disk/disk$(((r-1)*15+k)).qcow2,if=none,id=drive-virtio0-0-$(((r-1)*15+k)),format=qcow2,cache=none -device virtio-blk-pci,scsi=off,drive=drive-virtio0-0-$(((r-1)*15+k)),id=virti0-0-$(((r-1)*15+k)),multifunction=on,bus=downstream$(((r-1)*15+k))"

    done

done
echo $i
$cli


2. modify value of "k", when it's 6, guest can boot correctly, when it's 7 and 8, boot menu shows correctly, but guest fails to find the disk, boots from pxe instead, and when it's larger than 8, guest got black screen, bios menu won't show at all.



After roll back to seabios-1.7.2.2-10.el7.x86_64.rpm:

1. still can not find disk when k=8, boot from pxe instead

2. when k=9, guest won't got black screen, situation is the same to k=8. So kind of regression, though it's not too much better before.
Comment 2 juzhang 2014-05-05 07:05:44 UTC 
(In reply to Shaolong Hu from comment #0)
> Description of problem:
> ----------------------------
> Guest fail to boot with multiple PCIE downstream bridge behind one upstream
> bridge.
> 
> 
> Version-Release number of selected component (if applicable):
> -----------------------------------------------------------------
> seabios-1.7.2.2-12.el7.x86_64
> qemu-kvm-1.5.3-60.el7.x86_64
> 

> 
> 
> 2. modify value of "k", when it's 6, guest can boot correctly, when it's 7
> and 8, boot menu shows correctly, but guest fails to find the disk, boots
> from pxe instead, and when it's larger than 8, guest got black screen, bios
> menu won't show at all.
> 
> 
> 
> After roll back to seabios-1.7.2.2-10.el7.x86_64.rpm:
> 
> 1. still can not find disk when k=8, boot from pxe instead
> 
> 2. when k=9, guest won't got black screen, situation is the same to k=8. So
> kind of regression, though it's not too much better before.

According to our qe testing result.

With seabios-1.7.2.2-12.el7.x86_64, guest got black screen, bios menu won't show at all.

With seabios-1.7.2.2-10.el7.x86_64.rpm, guest won't got black screen and only won't find disk.

Although both seabios-1.7.2.2-12.el7.x86_64 and seabios-1.7.2.2-10.el7.x86_64 does not works as well but it's kind of regression from qe side. Mark regression first, free to remove the regression keyword with comment if there is wrong.
Comment 6 Ronen Hod 2014-10-26 14:16:03 UTC 
Too late for 7.1. Deferring to 7.2
Q35 is in tech-preview anyhow.
Limited to 6 ports per switch (not dead otherwise). There are other options ...
It is a bug.
Comment 10 Marcel Apfelbaum 2015-12-22 15:26:18 UTC 
With current SeaBIOS k can be now 14 and in order to get to 32 do not attach devices that require IO space. Please see BZ 1272938 for further info.

*** This bug has been marked as a duplicate of bug 1272938 ***
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