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Bug 1404287 - qemu-kvm cannot boot RHEL 7 kernel with TCG, hangs at "Probing EDD (edd=off to disable)..."
Summary: qemu-kvm cannot boot RHEL 7 kernel with TCG, hangs at "Probing EDD (edd=off t...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libguestfs
Version: 7.4
Hardware: Unspecified
OS: Unspecified
high
high
Target Milestone: rc
: ---
Assignee: Richard W.M. Jones
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On: 1359086
Blocks: 1406393
TreeView+ depends on / blocked
 
Reported: 2016-12-13 14:31 UTC by Lubos Kocman
Modified: 2017-08-01 22:11 UTC (History)
11 users (show)

Fixed In Version: libguestfs-1.36.1-1.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
: 1406393 (view as bug list)
Environment:
Last Closed: 2017-08-01 22:11:26 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHBA-2017:2023 0 normal SHIPPED_LIVE libguestfs bug fix and enhancement update 2017-08-01 19:32:01 UTC

Description Lubos Kocman 2016-12-13 14:31:35 UTC 
Description of problem:

rel-eng is using guestmount to mount bootimage without root permissions as part of compose process. This is forcing us to diverge from upstream ...

Version-Release number of selected component (if applicable):


How reproducible:


Steps to Reproduce:
1. cd /tmp
2. mkdir -p /tmp/whatever
3. curl -L -O http://download.lab.bos.redhat.com/devel/lkocman/efiboot.img
4. LIBGUESTFS_BACKEND=direct guestmount -a efiboot.img -m /dev/sda /tmp/whatever -v


Actual results:

-bash-4.2$ LIBGUESTFS_BACKEND=direct guestmount -a efiboot.img -m /dev/sda /tmp/whatever -v
libguestfs: launch: program=guestmount
libguestfs: launch: version=1.32.7rhel=7,release=3.el7,libvirt
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: libvirt
libguestfs: launch: backend registered: direct
libguestfs: launch: backend=direct
libguestfs: launch: tmpdir=/tmp/libguestfsFRpDuH
libguestfs: launch: umask=0002
libguestfs: launch: euid=15196
libguestfs: is_openable: /dev/kvm: No such file or directory
libguestfs: begin building supermin appliance
libguestfs: run supermin
libguestfs: command: run: /usr/bin/supermin5
libguestfs: command: run: \ --build
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ --if-newer
libguestfs: command: run: \ --lock /var/tmp/.guestfs-15196/lock
libguestfs: command: run: \ --copy-kernel
libguestfs: command: run: \ -f ext2
libguestfs: command: run: \ --host-cpu x86_64
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ -o /var/tmp/.guestfs-15196/appliance.d
supermin: version: 5.1.16
supermin: rpm: detected RPM version 4.11
supermin: package handler: fedora/rpm
supermin: acquiring lock on /var/tmp/.guestfs-15196/lock
supermin: if-newer: output does not need rebuilding
libguestfs: finished building supermin appliance
libguestfs: begin testing qemu features
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -help
libguestfs: qemu version 1.5
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -machine accel=kvm:tcg
libguestfs: command: run: \ -device ?
libguestfs: finished testing qemu features
libguestfs: command: run: dmesg | grep -Eoh 'lpj=[[:digit:]]+'
libguestfs: read_lpj_from_dmesg: calculated lpj=2499998
[07327ms] /usr/libexec/qemu-kvm \
    -global virtio-blk-pci.scsi=off \
    -nodefconfig \
    -enable-fips \
    -nodefaults \
    -display none \
    -machine accel=kvm:tcg \
    -m 500 \
    -no-reboot \
    -rtc driftfix=slew \
    -no-hpet \
    -global kvm-pit.lost_tick_policy=discard \
    -kernel /var/tmp/.guestfs-15196/appliance.d/kernel \
    -initrd /var/tmp/.guestfs-15196/appliance.d/initrd \
    -object rng-random,filename=/dev/urandom,id=rng0 \
    -device virtio-rng-pci,rng=rng0 \
    -device virtio-scsi-pci,id=scsi \
    -drive file=/tmp/efiboot.img,cache=writeback,id=hd0,if=none \
    -device scsi-hd,drive=hd0 \
    -drive file=/var/tmp/.guestfs-15196/appliance.d/root,snapshot=on,id=appliance,cache=unsafe,if=none,format=raw \
    -device scsi-hd,drive=appliance \
    -device virtio-serial-pci \
    -serial stdio \
    -device sga \
    -chardev socket,path=/tmp/libguestfsFRpDuH/guestfsd.sock,id=channel0 \
    -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
    -append 'panic=1 console=ttyS0 udevtimeout=6000 udev.event-timeout=6000 no_timer_check lpj=2499998 printk.time=1 cgroup_disable=memory usbcore.nousb cryptomgr.notests 8250.nr_uarts=1 root=/dev/sdb selinux=0 guestfs_verbose=1 TERM=xterm-256color'
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
libguestfs: responding to serial console Device Status Report
\x1b[1;256r\x1b[256;256H\x1b[6n
Google, Inc.
Serial Graphics Adapter 12/29/13
SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $ (mockbuild@) Sun Dec 29 03:43:06 UTC 2013
Term: 80x24
4 0
SeaBIOS (version 1.9.1-5.el7)
Booting from ROM...
Probing EDD (edd=off to disable)... 

Expected results:

would mount the actual image ... works on fedora with same efiboot.img!
Comment 1 Richard W.M. Jones 2016-12-13 14:54:37 UTC 
The "Probing EDD" message comes from the kernel, but very early on.
FWIW the next message (also from the kernel) should be:

\x1b[2J[    0.000000] Initializing cgroup subsys cpuset

So, this is a kernel bug.  Which kernel is this?
I tested kernel-3.10.0-514.el7.x86_64 and that WFM.

You can also rm -rf /var/tmp/.guestfs-* which will cause
libguestfs to rebuild the appliance cache using the latest
(highest version) kernel in /boot.

If you have a weird kernel installed as the latest kernel in
/boot then you can change how supermin picks the kernel by
setting the SUPERMIN_KERNEL and SUPERMIN_MODULES environment
variables (http://libguestfs.org/supermin.1.html).
Comment 3 Xianghua Chen 2016-12-15 11:53:58 UTC 
Can't reproduce it either using kernel-3.10.0-327.el7.x86_64 & libguestfs-1.32.7-3.el7.x86_64.
Comment 4 Red Hat Bugzilla Rules Engine 2016-12-15 11:54:05 UTC 
Quality Engineering Management has reviewed and declined this request. You may appeal this decision by reopening this request.
Comment 5 Lubos Kocman 2016-12-15 12:08:04 UTC 
[root@rcm-compose-nightly-01 lkocman]# uname -r
3.10.0-514.el7.x86_64
Comment 6 Lubos Kocman 2016-12-15 12:11:01 UTC 
[root@rcm-compose-nightly-01 tmp]# mkdir /tmp/whatever 
mkdir: cannot create directory '/tmp/whatever': File exists
[root@rcm-compose-nightly-01 tmp]# rm -rf /tmp/whatever 
[root@rcm-compose-nightly-01 tmp]# mkdir /tmp/whatever
[root@rcm-compose-nightly-01 tmp]# curl -L -O http://download.lab.bos.redhat.com/devel/lkocman/efiboot.img
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0   252    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 5396k  100 5396k    0     0  11.1M      0 --:--:-- --:--:-- --:--:-- 17.5M
[root@rcm-compose-nightly-01 tmp]# LIBGUESTFS_BACKEND=direct guestmount -a efiboot.img -m /dev/sda /tmp/whatever -v
libguestfs: launch: program=guestmount
libguestfs: launch: version=1.32.7rhel=7,release=3.el7,libvirt
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: libvirt
libguestfs: launch: backend registered: direct
libguestfs: launch: backend=direct
libguestfs: launch: tmpdir=/tmp/libguestfs7hiTun
libguestfs: launch: umask=0022
libguestfs: launch: euid=0
libguestfs: is_openable: /dev/kvm: No such file or directory
libguestfs: begin building supermin appliance
libguestfs: run supermin
libguestfs: command: run: /usr/bin/supermin5
libguestfs: command: run: \ --build
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ --if-newer
libguestfs: command: run: \ --lock /var/tmp/.guestfs-0/lock
libguestfs: command: run: \ --copy-kernel
libguestfs: command: run: \ -f ext2
libguestfs: command: run: \ --host-cpu x86_64
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ -o /var/tmp/.guestfs-0/appliance.d
supermin: version: 5.1.16
supermin: rpm: detected RPM version 4.11
supermin: package handler: fedora/rpm
supermin: acquiring lock on /var/tmp/.guestfs-0/lock
supermin: build: /usr/lib64/guestfs/supermin.d
supermin: reading the supermin appliance
supermin: build: visiting /usr/lib64/guestfs/supermin.d/base.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/daemon.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/excludefiles type uncompressed excludefiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/hostfiles type uncompressed hostfiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/init.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/packages type uncompressed packages
supermin: build: visiting /usr/lib64/guestfs/supermin.d/udev-rules.tar.gz type gzip base image (tar)
supermin: mapping package names to installed packages
supermin: resolving full list of package dependencies
supermin: build: 198 packages, including dependencies
supermin: build: 31785 files
supermin: build: 8306 files, after matching excludefiles
supermin: build: 8312 files, after adding hostfiles
supermin: build: 8306 files, after removing unreadable files
supermin: build: 8346 files, after munging
supermin: kernel: picked kernel vmlinuz-3.10.0-514.el7.x86_64
supermin: kernel: picked modules path /lib/modules/3.10.0-514.el7.x86_64
supermin: kernel: kernel_version 3.10.0-514.el7.x86_64
supermin: kernel: modules /lib/modules/3.10.0-514.el7.x86_64
supermin: ext2: creating empty ext2 filesystem '/var/tmp/.guestfs-0/appliance.d.mf3nkaj9/root'
supermin: ext2: populating from base image
supermin: ext2: copying files from host filesystem
supermin: ext2: copying kernel modules
supermin: ext2: creating minimal initrd '/var/tmp/.guestfs-0/appliance.d.mf3nkaj9/initrd'
supermin: ext2: wrote 31 modules to minimal initrd
supermin: renaming /var/tmp/.guestfs-0/appliance.d.mf3nkaj9 to /var/tmp/.guestfs-0/appliance.d
libguestfs: finished building supermin appliance
libguestfs: begin testing qemu features
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -help
libguestfs: qemu version 1.5
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -machine accel=kvm:tcg
libguestfs: command: run: \ -device ?
libguestfs: finished testing qemu features
libguestfs: command: run: dmesg | grep -Eoh 'lpj=[[:digit:]]+'
libguestfs: read_lpj_from_dmesg: calculated lpj=2499998
[28106ms] /usr/libexec/qemu-kvm \
    -global virtio-blk-pci.scsi=off \
    -nodefconfig \
    -enable-fips \
    -nodefaults \
    -display none \
    -machine accel=kvm:tcg \
    -m 500 \
    -no-reboot \
    -rtc driftfix=slew \
    -no-hpet \
    -global kvm-pit.lost_tick_policy=discard \
    -kernel /var/tmp/.guestfs-0/appliance.d/kernel \
    -initrd /var/tmp/.guestfs-0/appliance.d/initrd \
    -object rng-random,filename=/dev/urandom,id=rng0 \
    -device virtio-rng-pci,rng=rng0 \
    -device virtio-scsi-pci,id=scsi \
    -drive file=/tmp/efiboot.img,cache=writeback,id=hd0,if=none \
    -device scsi-hd,drive=hd0 \
    -drive file=/var/tmp/.guestfs-0/appliance.d/root,snapshot=on,id=appliance,cache=unsafe,if=none,format=raw \
    -device scsi-hd,drive=appliance \
    -device virtio-serial-pci \
    -serial stdio \
    -device sga \
    -chardev socket,path=/tmp/libguestfs7hiTun/guestfsd.sock,id=channel0 \
    -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
    -append 'panic=1 console=ttyS0 udevtimeout=6000 udev.event-timeout=6000 no_timer_check lpj=2499998 printk.time=1 cgroup_disable=memory usbcore.nousb cryptomgr.notests 8250.nr_uarts=1 root=/dev/sdb selinux=0 guestfs_verbose=1 TERM=xterm-256color'
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
libguestfs: responding to serial console Device Status Report
\x1b[1;256r\x1b[256;256H\x1b[6n
Google, Inc.
Serial Graphics Adapter 12/29/13
SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $ (mockbuild@) Sun Dec 29 03:43:06 UTC 2013
Term: 80x24
4 0
SeaBIOS (version 1.9.1-5.el7)
Booting from ROM...
Probing EDD (edd=off to disable)...
Comment 7 Richard W.M. Jones 2016-12-15 12:55:00 UTC 
In fact I *can* reproduce it.  However it only happens inside a nested
guest on an Intel host (not on an AMD host as I was using before).
So it's either TCG or a kernel bug.

kernel-3.10.0-514.el7.x86_64
qemu-kvm-1.5.3-126.el7.x86_64

I notice that both of us are using qemu-kvm 1.5 (ie. the ancient
version).  I didn't try qemu-kvm-rhev yet, but that has a different
TCG implementation so it might be worth trying.
Comment 8 Richard W.M. Jones 2016-12-15 13:01:13 UTC 
Yes it works fine with qemu-kvm-rhev-2.6.0-28.el7_3.2.x86_64

So it's a qemu-kvm TCG bug.  Note that we don't really support
TCG at all, but I'll try to see if it's something obvious.
Comment 9 Richard W.M. Jones 2016-12-15 13:13:58 UTC 
Weirdly this only happens when you attach a virtio-scsi device.

This command works:

# /usr/libexec/qemu-kvm -nodefconfig -nodefaults -display none -m 500 -no-reboot -machine accel=kvm:tcg -kernel /boot/vmlinuz-3.10.0-514.el7.x86_64 -append "panic=1 console=ttyS0" -device sga -serial stdio

This command fails (the reproducer):

# truncate -s 1G /var/tmp/empty
# /usr/libexec/qemu-kvm -nodefconfig -nodefaults -display none -m 500 -no-reboot -machine accel=kvm:tcg -kernel /boot/vmlinuz-3.10.0-514.el7.x86_64 -append "panic=1 console=ttyS0" -device virtio-scsi-pci,id=scsi -drive file=/var/tmp/empty,cache=writeback,id=hd0,if=none -device scsi-hd,drive=hd0 -device sga -serial stdio
Comment 10 Richard W.M. Jones 2016-12-15 13:16:43 UTC 
Another workaround is to disable EDD (as indeed it says in the
kernel message).

  export LIBGUESTFS_APPEND="edd=off"

This works even with qemu-kvm 1.5.3.
Comment 11 Nadav Goldin 2016-12-18 12:55:02 UTC 
Here too on a centos 7.3 VM:

[root@localhost ~]# guestfish get-backend
direct
[root@localhost ~]# rpm -qa | grep qemu
qemu-kvm-common-1.5.3-126.el7.x86_64
qemu-kvm-1.5.3-126.el7.x86_64
qemu-img-1.5.3-126.el7.x86_64
libvirt-daemon-driver-qemu-2.0.0-10.el7_3.2.x86_64
ipxe-roms-qemu-20160127-5.git6366fa7a.el7.noarch
[root@localhost ~]# uname -r
3.10.0-514.el7.x86_64
[root@localhost ~]# cat /etc/*release*
CentOS Linux release 7.3.1611 (Core) 
Derived from Red Hat Enterprise Linux 7.3 (Source)
NAME="CentOS Linux"
VERSION="7 (Core)"
ID="centos"
ID_LIKE="rhel fedora"
VERSION_ID="7"
PRETTY_NAME="CentOS Linux 7 (Core)"
ANSI_COLOR="0;31"
CPE_NAME="cpe:/o:centos:centos:7"
HOME_URL="https://www.centos.org/"
BUG_REPORT_URL="https://bugs.centos.org/"

CENTOS_MANTISBT_PROJECT="CentOS-7"
CENTOS_MANTISBT_PROJECT_VERSION="7"
REDHAT_SUPPORT_PRODUCT="centos"
REDHAT_SUPPORT_PRODUCT_VERSION="7"

CentOS Linux release 7.3.1611 (Core) 
CentOS Linux release 7.3.1611 (Core) 
cpe:/o:centos:centos:7
[root@localhost ~]# libguestfs-test-tool 
     ************************************************************
     *                    IMPORTANT NOTICE
     *
     * When reporting bugs, include the COMPLETE, UNEDITED
     * output below in your bug report.
     *
     ************************************************************
LIBGUESTFS_BACKEND=direct
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/root/bin
SELinux: Enforcing
guestfs_get_append: (null)
guestfs_get_autosync: 1
guestfs_get_backend: direct
guestfs_get_backend_settings: []
guestfs_get_cachedir: /var/tmp
guestfs_get_direct: 0
guestfs_get_hv: /usr/libexec/qemu-kvm
guestfs_get_memsize: 500
guestfs_get_network: 0
guestfs_get_path: /usr/lib64/guestfs
guestfs_get_pgroup: 0
guestfs_get_program: libguestfs-test-tool
guestfs_get_recovery_proc: 1
guestfs_get_smp: 1
guestfs_get_tmpdir: /tmp
guestfs_get_trace: 0
guestfs_get_verbose: 1
host_cpu: x86_64
Launching appliance, timeout set to 600 seconds.
libguestfs: launch: program=libguestfs-test-tool
libguestfs: launch: version=1.32.7rhel=7,release=3.el7.centos,libvirt
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: libvirt
libguestfs: launch: backend registered: direct
libguestfs: launch: backend=direct
libguestfs: launch: tmpdir=/tmp/libguestfsXEVTPF
libguestfs: launch: umask=0022
libguestfs: launch: euid=0
libguestfs: is_openable: /dev/kvm: No such file or directory
libguestfs: begin building supermin appliance
libguestfs: run supermin
libguestfs: command: run: /usr/bin/supermin5
libguestfs: command: run: \ --build
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ --if-newer
libguestfs: command: run: \ --lock /var/tmp/.guestfs-0/lock
libguestfs: command: run: \ --copy-kernel
libguestfs: command: run: \ -f ext2
libguestfs: command: run: \ --host-cpu x86_64
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ -o /var/tmp/.guestfs-0/appliance.d
supermin: version: 5.1.16
supermin: rpm: detected RPM version 4.11
supermin: package handler: fedora/rpm
supermin: acquiring lock on /var/tmp/.guestfs-0/lock
supermin: if-newer: output does not need rebuilding
libguestfs: finished building supermin appliance
libguestfs: begin testing qemu features
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -help
libguestfs: qemu version 1.5
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -machine accel=kvm:tcg
libguestfs: command: run: \ -device ?
libguestfs: finished testing qemu features
libguestfs: command: run: dmesg | grep -Eoh 'lpj=[[:digit:]]+'
libguestfs: read_lpj_from_dmesg: calculated lpj=2808018
[00174ms] /usr/libexec/qemu-kvm \
    -global virtio-blk-pci.scsi=off \
    -nodefconfig \
    -enable-fips \
    -nodefaults \
    -display none \
    -machine accel=kvm:tcg \
    -m 500 \
    -no-reboot \
    -rtc driftfix=slew \
    -no-hpet \
    -global kvm-pit.lost_tick_policy=discard \
    -kernel /var/tmp/.guestfs-0/appliance.d/kernel \
    -initrd /var/tmp/.guestfs-0/appliance.d/initrd \
    -object rng-random,filename=/dev/urandom,id=rng0 \
    -device virtio-rng-pci,rng=rng0 \
    -device virtio-scsi-pci,id=scsi \
    -drive file=/tmp/libguestfsXEVTPF/scratch.1,cache=unsafe,format=raw,id=hd0,if=none \
    -device scsi-hd,drive=hd0 \
    -drive file=/var/tmp/.guestfs-0/appliance.d/root,snapshot=on,id=appliance,cache=unsafe,if=none,format=raw \
    -device scsi-hd,drive=appliance \
    -device virtio-serial-pci \
    -serial stdio \
    -device sga \
    -chardev socket,path=/tmp/libguestfsXEVTPF/guestfsd.sock,id=channel0 \
    -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
    -append 'panic=1 console=ttyS0 udevtimeout=6000 udev.event-timeout=6000 no_timer_check lpj=2808018 printk.time=1 cgroup_disable=memory usbcore.nousb cryptomgr.notests 8250.nr_uarts=1 root=/dev/sdb selinux=0 guestfs_verbose=1 TERM=xterm-256color'
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
libguestfs: responding to serial console Device Status Report
\x1b[1;256r\x1b[256;256H\x1b[6n
Google, Inc.
Serial Graphics Adapter 06/09/14
SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $ (mockbuild@) Mon Jun  9 21:33:48 UTC 2014
Term: 80x24
4 0
SeaBIOS (version 1.9.1-5.el7)
Booting from ROM...
Probing EDD (edd=off to disable)...
Comment 12 Richard W.M. Jones 2016-12-18 19:33:58 UTC 
Patch posted:

https://www.redhat.com/archives/libguestfs/2016-December/msg00147.html

Jarda, this bug is also a candidate for RHEL 7.3 z-stream.  Could
you please add the flag for us?
Comment 13 Richard W.M. Jones 2016-12-18 19:35:07 UTC 
NB: This is a bug in qemu-kvm, but as it is easily worked around
in libguestfs I am moving the bug back to libguestfs.
Comment 14 Xianghua Chen 2016-12-20 06:48:23 UTC 
I can reproduce it now with the following pacakges：
libguestfs-1.32.7-3.el7.x86_64
qemu-kvm-1.5.3-126.el7.x86_64

Steps:
1. Prepare an rhel7 guest image on an Intel host (not on an AMD host),boot it.
2. In the guest vm：
Update the qemu-kvm version to ：
qemu-kvm-1.5.3-126.el7.x86_64
Install libguestfs：
libguestfs-1.32.7-3.el7.x86_64
3. 
# mkdir /tmp/whatever 
# cd /tmp
# curl -L -O http://download.lab.bos.redhat.com/devel/lkocman/efiboot.img
# LIBGUESTFS_BACKEND=direct guestmount -a efiboot.img -m /dev/sda /tmp/whatever -v
libguestfs: launch: program=guestmount
libguestfs: launch: version=1.32.7rhel=7,release=3.el7,libvirt
libguestfs: launch: backend registered: unix
libguestfs: launch: backend registered: uml
libguestfs: launch: backend registered: libvirt
libguestfs: launch: backend registered: direct
libguestfs: launch: backend=direct
libguestfs: launch: tmpdir=/tmp/libguestfs34su5t
libguestfs: launch: umask=0022
libguestfs: launch: euid=0
libguestfs: is_openable: /dev/kvm: No such file or directory
libguestfs: begin building supermin appliance
libguestfs: run supermin
libguestfs: command: run: /usr/bin/supermin5
libguestfs: command: run: \ --build
libguestfs: command: run: \ --verbose
libguestfs: command: run: \ --if-newer
libguestfs: command: run: \ --lock /var/tmp/.guestfs-0/lock
libguestfs: command: run: \ --copy-kernel
libguestfs: command: run: \ -f ext2
libguestfs: command: run: \ --host-cpu x86_64
libguestfs: command: run: \ /usr/lib64/guestfs/supermin.d
libguestfs: command: run: \ -o /var/tmp/.guestfs-0/appliance.d
supermin: version: 5.1.16
supermin: rpm: detected RPM version 4.11
supermin: package handler: fedora/rpm
supermin: acquiring lock on /var/tmp/.guestfs-0/lock
supermin: build: /usr/lib64/guestfs/supermin.d
supermin: reading the supermin appliance
supermin: build: visiting /usr/lib64/guestfs/supermin.d/base.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/daemon.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/excludefiles type uncompressed excludefiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/hostfiles type uncompressed hostfiles
supermin: build: visiting /usr/lib64/guestfs/supermin.d/init.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/packages type uncompressed packages
supermin: build: visiting /usr/lib64/guestfs/supermin.d/udev-rules.tar.gz type gzip base image (tar)
supermin: build: visiting /usr/lib64/guestfs/supermin.d/zz-packages-xfs type uncompressed packages
supermin: build: visiting /usr/lib64/guestfs/supermin.d/zz-winsupport.tar.gz type gzip base image (tar)
supermin: mapping package names to installed packages
supermin: resolving full list of package dependencies
supermin: build: 204 packages, including dependencies
supermin: build: 31367 files
supermin: build: 8331 files, after matching excludefiles
supermin: build: 8340 files, after adding hostfiles
supermin: build: 8334 files, after removing unreadable files
supermin: build: 8375 files, after munging
supermin: kernel: picked kernel vmlinuz-3.10.0-327.el7.x86_64
supermin: kernel: picked modules path /lib/modules/3.10.0-327.el7.x86_64
supermin: kernel: kernel_version 3.10.0-327.el7.x86_64
supermin: kernel: modules /lib/modules/3.10.0-327.el7.x86_64
supermin: ext2: creating empty ext2 filesystem '/var/tmp/.guestfs-0/appliance.d.85hibdfj/root'
supermin: ext2: populating from base image
supermin: ext2: copying files from host filesystem
supermin: ext2: copying kernel modules
supermin: ext2: creating minimal initrd '/var/tmp/.guestfs-0/appliance.d.85hibdfj/initrd'
supermin: ext2: wrote 27 modules to minimal initrd
supermin: renaming /var/tmp/.guestfs-0/appliance.d.85hibdfj to /var/tmp/.guestfs-0/appliance.d
libguestfs: finished building supermin appliance
libguestfs: begin testing qemu features
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -help
libguestfs: qemu version 1.5
libguestfs: command: run: /usr/libexec/qemu-kvm
libguestfs: command: run: \ -display none
libguestfs: command: run: \ -machine accel=kvm:tcg
libguestfs: command: run: \ -device ?
libguestfs: finished testing qemu features
libguestfs: command: run: dmesg | grep -Eoh 'lpj=[[:digit:]]+'
libguestfs: read_lpj_from_dmesg: calculated lpj=2666664
[33163ms] /usr/libexec/qemu-kvm \
    -global virtio-blk-pci.scsi=off \
    -nodefconfig \
    -enable-fips \
    -nodefaults \
    -display none \
    -machine accel=kvm:tcg \
    -m 500 \
    -no-reboot \
    -rtc driftfix=slew \
    -no-hpet \
    -global kvm-pit.lost_tick_policy=discard \
    -kernel /var/tmp/.guestfs-0/appliance.d/kernel \
    -initrd /var/tmp/.guestfs-0/appliance.d/initrd \
    -object rng-random,filename=/dev/urandom,id=rng0 \
    -device virtio-rng-pci,rng=rng0 \
    -device virtio-scsi-pci,id=scsi \
    -drive file=/tmp/efiboot.img,cache=writeback,id=hd0,if=none \
    -device scsi-hd,drive=hd0 \
    -drive file=/var/tmp/.guestfs-0/appliance.d/root,snapshot=on,id=appliance,cache=unsafe,if=none,format=raw \
    -device scsi-hd,drive=appliance \
    -device virtio-serial-pci \
    -serial stdio \
    -device sga \
    -chardev socket,path=/tmp/libguestfs34su5t/guestfsd.sock,id=channel0 \
    -device virtserialport,chardev=channel0,name=org.libguestfs.channel.0 \
    -append 'panic=1 console=ttyS0 udevtimeout=6000 udev.event-timeout=6000 no_timer_check lpj=2666664 printk.time=1 cgroup_disable=memory usbcore.nousb cryptomgr.notests 8250.nr_uarts=1 root=/dev/sdb selinux=0 guestfs_verbose=1 TERM=xterm-256color'
Could not access KVM kernel module: No such file or directory
failed to initialize KVM: No such file or directory
Back to tcg accelerator.
libguestfs: responding to serial console Device Status Report
\x1b[1;256r\x1b[256;256H\x1b[6n
Google, Inc.
Serial Graphics Adapter 12/29/13
SGABIOS $Id: sgabios.S 8 2010-04-22 00:03:40Z nlaredo $ (mockbuild@) Sun Dec 29 03:43:06 UTC 2013
Term: 80x24
4 0
SeaBIOS (version seabios-1.7.5-11.el7)
Booting from ROM...
Probing EDD (edd=off to disable)... ok
Comment 17 YongkuiGuo 2017-03-29 09:34:41 UTC 
Verified with packages:
libguestfs-1.36.3-1.el7.x86_64
qemu-kvm-1.5.3-126.el7.x86_64 (and qemu-kvm-1.5.3-134.el7.x86_64)

Steps:
1. cd /tmp
2. mkdir -p /tmp/whatever
3. curl -L -O http://download.lab.bos.redhat.com/devel/lkocman/efiboot.img
4. LIBGUESTFS_BACKEND=direct guestmount -a efiboot.img -m /dev/sda /tmp/whatever 

Actual results:
The last command can be executed successfully.  So verified.
Comment 18 errata-xmlrpc 2017-08-01 22:11:26 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2023
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