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+
+[UBUNTU 20.04] KVM guest fails to find zipl boot menu index
+
+---Problem Description---
+A KVM guest fails to find the zipl boot menu index if the "zIPL" magic value is listed at the end of a disk block. 
+ 
+---System Hang---
+System sits in disabled wait, last console display
+LOADPARM=[        ]
+Using virtio-blk.
+Using ECKD scheme (block size  4096), CDL
+VOLSER=[0X0067]
+ 
+ 
+---Steps to Reproduce---
+1. Install Distro KVM guest from ISO on a DASD, e.g. using virt-install, my invocation was 
+$ virt-install --name secguest2 --memory 2048 --disk path=/dev/disk/by-path/ccw-0.0.af6a --cdrom /var/lib/libvirt/images/xxxxxx.iso
+
+2. Select DHCP networking and ASCII console, and accept all defaults of the installer
+
+3. Let the installer reboot after the installation completes
+
+It is possible to recover by editing the domain XML with an explicit loadparm to select a boot menu entry. E.g. I changed the disk definition to
+   <disk type='block' device='disk'>
+      <driver name='qemu' type='raw' cache='none' io='native'/>
+      <source dev='/dev/disk/by-path/ccw-0.0.af6a'/>
+      <target dev='vda' bus='virtio'/>
+      <boot order='1' loadparm='1'/>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0xaf6a'/>
+    </disk>
+
+The patches are now upstream:
+5f97ba0c74cc ("pc-bios/s390-ccw: fix off-by-one error")
+468184ec9024 ("pc-bios/s390-ccw: break loop if a null block number is reached")
+
+Current versions of qemu within Ubuntu
+
+focal (20.04LTS) 1:4.2-3ubuntu6 [ports]: arm64 armhf ppc64el s390x
+focal-updates (metapackages): 1:4.2-3ubuntu6.14: amd64 arm64 armhf ppc64el s390x
+
+groovy (20.10) (metapackages): 1:5.0-5ubuntu9 [ports]: arm64 armhf ppc64el s390x
+groovy-updates (metapackages): 1:5.0-5ubuntu9.6: amd64 arm64 armhf ppc64el s390x
+
+hirsute (metapackages): 1:5.2+dfsg-9ubuntu1: amd64 arm64 armhf ppc64el s390x 
+
+
+git-commits will apply seamlessley for the requested levels if not already integrated
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