We explicitly disabled EFI roms in rhel 7 so they are not present and used. As unofficial build o qemu-kvm is used, appropriate ipxe has to be used.

OK, I see what is going on now

---
2014-07-02 01:56:44.352 | Installing:
2014-07-02 01:56:44.352 |  qemu-system-x86   x86_64   2:2.0.0-1.el7.1               epel            3.4 M
---

qemu-system-x86 is coming from EPEL, where it is version 2.0.0

I think the problem is this is not bringing in a late-enough version of qemu-ipxe-roms [1], which is still coming from the rhel7 versions.  Hence these broken links.

[1] http://pkgs.fedoraproject.org/cgit/qemu.git/tree/qemu.spec?h=f20#n627

Issue is in incompatible ipxe and qemu-system-x86. To solve the issue, proper ipxe has to be installed.

Same problem here. There are also other problems with symlinks from qemu. Here are broken symlinks:

[root@vs qemu]# find . -type l -xtype l -exec ls -l {} \;
lrwxrwxrwx. 1 root root 24 Oct  7 08:03 ./acpi-dsdt.aml -> ../seabios/acpi-dsdt.aml
lrwxrwxrwx. 1 root root 24 Oct  7 08:03 ./efi-virtio.rom -> ../ipxe.efi/1af41000.rom
lrwxrwxrwx. 1 root root 24 Oct  7 08:03 ./efi-rtl8139.rom -> ../ipxe.efi/10ec8139.rom
lrwxrwxrwx. 1 root root 24 Oct  7 08:03 ./efi-ne2k_pci.rom -> ../ipxe.efi/10ec8029.rom
lrwxrwxrwx. 1 root root 28 Oct  7 08:03 ./q35-acpi-dsdt.aml -> ../seabios/q35-acpi-dsdt.aml
lrwxrwxrwx. 1 root root 24 Oct  7 08:03 ./efi-e1000.rom -> ../ipxe.efi/8086100e.rom
lrwxrwxrwx. 1 root root 24 Oct  7 08:03 ./efi-pcnet.rom -> ../ipxe.efi/10222000.rom

If you think, this is a problem of other component, please change component in this bug.

This bug breaks booting from network with qemu-2.0.0.

Jan, please provide the output of the following:

   # yum list installed | egrep 'qemu|seabios|ipxe'

Please also provide the URLs for the repositories from which these packages were installed.

Thanks.

Here it is:

ipxe-bootimgs.noarch                  20130517-5.gitc4bce43.el7        @base    
ipxe-roms.noarch                      20130517-5.gitc4bce43.el7        @base    
ipxe-roms-qemu.noarch                 20130517-5.gitc4bce43.el7        @base    
libvirt-daemon-driver-qemu.x86_64     1.1.1-29.el7_0.3                 @updates 
qemu-common.x86_64                    2:2.0.0-1.el7.1                  @epel    
qemu-img.x86_64                       10:1.5.3-60.el7_0.7.0.1          @updates 
qemu-kvm-common.x86_64                10:1.5.3-60.el7_0.7.0.1          @updates 
qemu-kvm-tools.x86_64                 10:1.5.3-60.el7_0.7.0.1          @updates 
qemu-system-x86.x86_64                2:2.0.0-1.el7.1                  @epel    
qemu-user.x86_64                      2:2.0.0-1.el7.1                  @epel    
seabios.x86_64                        1.7.2.2-12.el7_0.1               @updates 
seabios-bin.x86_64                    1.7.2.2-12.el7_0.1               @updates 

Btw, unable to install these files. Trying to install symlink target:

[root@vs3 ~]# yum install /usr/share/ipxe.efi/1af41000.rom
No package /usr/share/ipxe.efi/1af41000.rom available.

I use only standard CentOS 7 repository and EPEL, as you see from yum list.
ftp://ftp.upjs.sk/pub/centos/7/
ftp://ftp.upjs.sk/pub/mirrors/epel/7/

I don't know, which URL's you need exactly. They are default repositories for centos. I you need urls to some packages, I can give you.

A word of caution about the patch that went in:

http://pkgs.fedoraproject.org/cgit/qemu.git/commit/?h=epel7&id=baadb31598bd962b4ac554dfc803d0af99a88737

seabios >= 1.7.4 is required in order for certain Windows
guests to boot.  The problem won't be apparent unless you
specifically test a range of Windows guests (Linux guests will
work fine).

So you may need to add that versioned require back, or update
seabios in EPEL 7.

qemu-2.0.0-1.el7.2 has been submitted as an update for Fedora EPEL 7.
https://admin.fedoraproject.org/updates/qemu-2.0.0-1.el7.2

(In reply to Richard W.M. Jones from comment #12)
> A word of caution about the patch that went in:
> 
> http://pkgs.fedoraproject.org/cgit/qemu.git/commit/
> ?h=epel7&id=baadb31598bd962b4ac554dfc803d0af99a88737
> 
> seabios >= 1.7.4 is required in order for certain Windows
> guests to boot.  The problem won't be apparent unless you
> specifically test a range of Windows guests (Linux guests will
> work fine).
> 
> So you may need to add that versioned require back, or update
> seabios in EPEL 7.

Seabios is provided from RHEL, not EPEL. Nothing we can do anything about.

(In reply to Jan ONDREJ from comment #8)
> This bug breaks booting from network with qemu-2.0.0.

It should not; it should merely do so for EFI guests. In case you need support for EFI guests, you need to add a separate package to EPEL.

Package qemu-2.0.0-1.el7.2:
* should fix your issue,
* was pushed to the Fedora EPEL 7 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=epel-testing qemu-2.0.0-1.el7.2'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-EPEL-2014-3271/qemu-2.0.0-1.el7.2
then log in and leave karma (feedback).

Package qemu-2.0.0-1.el7.3:
* should fix your issue,
* was pushed to the Fedora EPEL 7 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=epel-testing qemu-2.0.0-1.el7.3'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-EPEL-2014-3271/qemu-2.0.0-1.el7.3
then log in and leave karma (feedback).

qemu-2.0.0-1.el7.3 has been pushed to the Fedora EPEL 7 stable repository.  If problems still persist, please make note of it in this bug report.