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Bug 906185 - kvm is not enabled by default on rhel7 qemu-kvm, but it is on rhel6 one otherwise
Summary: kvm is not enabled by default on rhel7 qemu-kvm, but it is on rhel6 one other...
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: qemu-kvm
Version: 7.0
Hardware: Unspecified
OS: Unspecified
medium
medium
Target Milestone: rc
: ---
Assignee: Miroslav Rezanina
QA Contact: Virtualization Bugs
URL:
Whiteboard:
: 919364 (view as bug list)
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2013-01-31 05:16 UTC by Chao Yang
Modified: 2014-06-18 03:21 UTC (History)
9 users (show)

Fixed In Version: qemu-kvm-1.4.0-3.el7.x86_64.rpm
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-06-13 12:54:36 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Chao Yang 2013-01-31 05:16:35 UTC 
Description of problem:
1. Boot a rhel7 qemu-kvm without -enable-kvm
2. Boot a rhel6 qemu-kvm without -enable-kvm

with rhel6 qemu-kvm:
/usr/libexec/qemu-kvm -monitor stdio
VNC server running on `::1:5900'
QEMU 0.12.1 monitor - type 'help' for more information
(qemu) info kvm 
kvm support: enabled


with rhel7.0. /usr/libexec/qemu-kvm -monitor stdio -vnc :10
QEMU 1.3.0 monitor - type 'help' for more information
(qemu) info kvm 
kvm support: disabled


booting withouth -enable-kvm would result in qemu-kvm coredump:
/usr/libexec/qemu-kvm -M q35 -monitor stdio -drive file=/home/RHEL-Server-6.4-64-virtio.qcow2,if=none,id=drive-ide0-0-0,format=qcow2,cache=none -device virtio-blk-pci,drive=drive-ide0-0-0 -vnc :1 -m 2048 -smp 2 -net none -vga cirrus -boot c
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffae998700 (LWP 24962)]
[New Thread 0x7fffadf96700 (LWP 24963)]
[New Thread 0x7fffaca73700 (LWP 24964)]
QEMU 1.3.0 monitor - type 'help' for more information
(qemu) 
Program received signal SIGUSR1, User defined signal 1.
[Switching to Thread 0x7fffadf96700 (LWP 24963)]
helper_stb_mmu (env=0x55555664d200, addr=1003745, val=114 'r', mmu_idx=0) at /usr/src/debug/qemu-1.3.0/softmmu_template.h:291
291	        tlb_fill(env, addr, 1, mmu_idx, retaddr);

(gdb) bt
#0  helper_stb_mmu (env=0x55555664d200, addr=1003745, val=114 'r', mmu_idx=0) at /usr/src/debug/qemu-1.3.0/softmmu_template.h:291
#1  0x00007fffcc99e036 in code_gen_buffer ()
#2  0x000055555577375e in cpu_x86_exec (env=env@entry=0x55555664d200) at /usr/src/debug/qemu-1.3.0/cpu-exec.c:599
#3  0x000055555577519e in tcg_cpu_exec (env=0x55555664d200) at /usr/src/debug/qemu-1.3.0/cpus.c:1115
#4  tcg_exec_all () at /usr/src/debug/qemu-1.3.0/cpus.c:1148
#5  qemu_tcg_cpu_thread_fn (arg=<optimized out>) at /usr/src/debug/qemu-1.3.0/cpus.c:841
#6  0x00007ffff6272d15 in start_thread () from /lib64/libpthread.so.0
#7  0x00007ffff2bba2cd in clone () from /lib64/libc.so.6



Version-Release number of selected component (if applicable):
qemu-kvm-1.3.0-3.el7.x86_64
seabios-1.7.2-0.2.gita810e4e7.el7.x86_64

How reproducible:
100%

Steps to Reproduce:
1.
2.
3.
  
Actual results:


Expected results:


Additional info:
Comment 2 Paolo Bonzini 2013-03-07 13:29:39 UTC 
In rawhide, qemu-kvm is a script that does

exec /usr/bin/qemu-system-x86_64 -machine accel=kvm "$@"

We need to instead patch vl.c to have the default accelerator "kvm:tcg" instead of "tcg", the same as in RHEL6.  It would be nice to have that patch upstream though.  Then Fedora could even drop the qemu-kvm script altogether.
Comment 3 Miroslav Rezanina 2013-04-23 09:42:50 UTC 
Fixed in qemu-kvm-1.4.0-3.el7.x86_64.rpm
Comment 4 Hai Huang 2013-08-08 17:46:49 UTC 
*** Bug 919364 has been marked as a duplicate of this bug. ***
Comment 6 mazhang 2014-01-16 06:52:25 UTC 
Reproduce this bug with qemu-img-1.3.0-3.el7.x86_64.

Host:
qemu-kvm-1.3.0-3.el7.x86_64
ipxe-roms-qemu-20130517-2.gitc4bce43.el7.noarch
qemu-img-1.3.0-3.el7.x86_64
qemu-kvm-tools-1.3.0-3.el7.x86_64
qemu-kvm-common-1.3.0-3.el7.x86_64
qemu-kvm-debuginfo-1.3.0-3.el7.x86_64
kernel-3.7.0-0.36.el7.x86_64

Steps:
1. Check kvm status.
[root@localhost qemu-kvm-1.3.0-3.el7]# /usr/libexec/qemu-kvm -monitor stdio -vnc :10
QEMU 1.3.0 monitor - type 'help' for more information
(qemu) info kvm
kvm support: disabled

2. Start qemu-kvm without "-enable-kvm", qemu-kvm core dumped.

(gdb) r -M pc -monitor stdio -drive file=/home/rhel6u5.qcow2,if=none,id=drive-ide0-0-0,format=qcow2,cache=none -device virtio-blk-pci,drive=drive-ide0-0-0 -vnc :1 -m 2048 -smp 2 -net none -vga cirrus -boot c
Starting program: /usr/libexec/qemu-kvm -M pc -monitor stdio -drive file=/home/rhel6u5.qcow2,if=none,id=drive-ide0-0-0,format=qcow2,cache=none -device virtio-blk-pci,drive=drive-ide0-0-0 -vnc :1 -m 2048 -smp 2 -net none -vga cirrus -boot c
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
[New Thread 0x7fffae97c700 (LWP 2531)]
[New Thread 0x7fffadf7a700 (LWP 2532)]
[New Thread 0x7fffacb5f700 (LWP 2533)]
QEMU 1.3.0 monitor - type 'help' for more information
(qemu) 
Program received signal SIGUSR1, User defined signal 1.
[Switching to Thread 0x7fffadf7a700 (LWP 2532)]
0x0000555555867b79 in tcg_liveness_analysis (s=s@entry=0x5555564b0820 <tcg_ctx>)
    at /usr/src/debug/qemu-1.3.0/tcg/tcg.c:1426
1426	                    if (dead_temps[arg]) {
Missing separate debuginfos, use: debuginfo-install SDL-1.2.15-4.el7.x86_64 alsa-lib-1.0.26-2.el7.x86_64 bluez-libs-4.101-6.el7.x86_64 brlapi-0.5.6-12.el7.x86_64 celt051-0.5.1.3-5.el7.x86_64 cyrus-sasl-lib-2.1.23-37.el7.x86_64 cyrus-sasl-md5-2.1.23-37.el7.x86_64 cyrus-sasl-plain-2.1.23-37.el7.x86_64 dbus-libs-1.6.8-3.el7.x86_64 flac-libs-1.2.1-12.20121204gita43f56.el7.x86_64 glib2-2.34.2-1.el7.x86_64 glibc-2.16-29.el7.x86_64 gnutls-2.12.21-2.el7.x86_64 gsm-1.0.13-7.el7.x86_64 json-c-0.10-2.el7.x86_64 keyutils-libs-1.5.5-3.el7.x86_64 krb5-libs-1.10.3-11.el7.x86_64 libICE-1.0.8-2.el7.x86_64 libSM-1.2.1-2.el7.x86_64 libX11-1.5.0-3.el7.x86_64 libXau-1.0.6-4.el7.x86_64 libXext-1.3.1-2.el7.x86_64 libXi-1.6.1-2.el7.x86_64 libXtst-1.2.1-3.el7.x86_64 libaio-0.3.109-9.el7.x86_64 libasyncns-0.8-4.el7.x86_64 libcom_err-1.42.6-2.el7.x86_64 libcurl-7.27.0-6.el7.x86_64 libdb-5.3.21-3.el7.x86_64 libgcc-4.7.2-8.el7.x86_64 libgcrypt-1.5.0-9.el7.x86_64 libgpg-error-1.10-3.el7.x86_64 libidn-1.26-1.el7.x86_64 libjpeg-turbo-1.2.1-4.el7.x86_64 libogg-1.3.0-2.el7.x86_64 libpng-1.5.13-1.el7.x86_64 libseccomp-1.0.1-0.el7.x86_64 libselinux-2.1.13-3.el7.x86_64 libsndfile-1.0.25-4.el7.x86_64 libssh2-1.4.3-1.el7.x86_64 libtasn1-2.14-1.el7.x86_64 libuuid-2.22.1-2.4.el7.x86_64 libvorbis-1.3.3-3.el7.x86_64 libxcb-1.9-1.el7.x86_64 ncurses-libs-5.9-7.20121017.el7.x86_64 nspr-4.9.4-1.el7.x86_64 nss-3.14.1-3.el7.x86_64 nss-softokn-freebl-3.14-5.el7.x86_64 nss-util-3.14.1-2.el7.x86_64 openldap-2.4.33-3.el7.x86_64 openssl-libs-1.0.1c-9.el7.x86_64 p11-kit-0.14-1.el7.x86_64 pcre-8.32-4.el7.x86_64 pixman-0.26.2-5.el7.x86_64 pulseaudio-libs-2.1-5.el7.x86_64 spice-server-0.12.2-1.el7.x86_64 tcp_wrappers-libs-7.6-70.el7.x86_64 usbredir-0.6-1.el7.x86_64 zlib-1.2.7-9.el7.x86_64
(gdb) bt
#0  0x0000555555867b79 in tcg_liveness_analysis (s=s@entry=0x5555564b0820 <tcg_ctx>)
    at /usr/src/debug/qemu-1.3.0/tcg/tcg.c:1426
#1  0x000055555586c166 in tcg_gen_code_common (search_pc=-1, gen_code_buf=
    0x7fffcc9a8650 <code_gen_buffer+177744> "", s=0x5555564b0820 <tcg_ctx>)
    at /usr/src/debug/qemu-1.3.0/tcg/tcg.c:2230
#2  tcg_gen_code (s=s@entry=0x5555564b0820 <tcg_ctx>, gen_code_buf=0x7fffcc9a8650 <code_gen_buffer+177744> "")
    at /usr/src/debug/qemu-1.3.0/tcg/tcg.c:2345
#3  0x000055555586cd0b in cpu_x86_gen_code (env=env@entry=0x55555664d800, tb=tb@entry=0x7fffae98de88, 
    gen_code_size_ptr=gen_code_size_ptr@entry=0x7fffadf79aa4) at /usr/src/debug/qemu-1.3.0/translate-all.c:87
#4  0x000055555577c66f in tb_gen_code (env=env@entry=0x55555664d800, pc=pc@entry=2147369667, cs_base=cs_base@entry=
    0, flags=180, cflags=cflags@entry=0) at /usr/src/debug/qemu-1.3.0/exec.c:1068
#5  0x0000555555773a36 in tb_find_slow (flags=<optimized out>, cs_base=0, pc=2147369667, env=0x55555664d800)
    at /usr/src/debug/qemu-1.3.0/cpu-exec.c:125
#6  tb_find_fast (env=0x55555664d800) at /usr/src/debug/qemu-1.3.0/cpu-exec.c:152
#7  cpu_x86_exec (env=env@entry=0x55555664d800) at /usr/src/debug/qemu-1.3.0/cpu-exec.c:567
#8  0x000055555577519e in tcg_cpu_exec (env=0x55555664d800) at /usr/src/debug/qemu-1.3.0/cpus.c:1115
#9  tcg_exec_all () at /usr/src/debug/qemu-1.3.0/cpus.c:1148
#10 qemu_tcg_cpu_thread_fn (arg=<optimized out>) at /usr/src/debug/qemu-1.3.0/cpus.c:841
#11 0x00007ffff6271d15 in start_thread () from /lib64/libpthread.so.0
#12 0x00007ffff2bb646d in clone () from /lib64/libc.so.6


Verify this bug with qemu-kvm-1.5.3-36.el7.x86_64.

1. Check kvm status.
[root@localhost home]# /usr/libexec/qemu-kvm -monitor stdio -vnc :10
QEMU 1.5.3 monitor - type 'help' for more information
(qemu) info kvm
kvm support: enabled

2. Start qemu-kvm without "-enable-kvm", qemu-kvm not core dumped, guest works well.

(gdb) r -M pc -monitor stdio -drive file=/home/rhel6u6-64.raw,if=none,id=drive-ide0-0-0,format=raw,cache=none -device virtio-blk-pci,drive=drive-ide0-0-0 -vnc :1 -m 2048 -smp 2 -net none -vga cirrus -boot c
Starting program: /usr/libexec/qemu-kvm -M pc -monitor stdio -drive file=/home/rhel6u6-64.raw,if=none,id=drive-ide0-0-0,format=raw,cache=none -device virtio-blk-pci,drive=drive-ide0-0-0 -vnc :1 -m 2048 -smp 2 -net none -vga cirrus -boot c
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
QEMU 1.5.3 monitor - type 'help' for more information
(qemu) [New Thread 0x7fffebda4700 (LWP 3682)]
(qemu) info [New Thread 0x7fff5afff700 (LWP 3687)]
[New Thread 0x7fff5a7fe700 (LWP 3688)]
info kvm
kvm support: enabled

So this bug has been fixed.
Comment 8 Ludek Smid 2014-06-13 12:54:36 UTC 
This request was resolved in Red Hat Enterprise Linux 7.0.

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