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+
+Initialization of device cfi.pflash01 failed: Block node is read-only
+
+Hi,
+
+I have several vms defined in libvirt using ovmf for uefi, since a later
+update of my server I'm unable to start any of the domains defined. This is
+an example of the output given:
+
+# virsh start os-1
+error: Failed to start domain os-1
+error: internal error: qemu unexpectedly closed the monitor: 2019-03-02T21:23:51.726446Z qemu-system-x86_64: Initialization of device cfi.pflash01 failed: Block node is read-only
+
+an example of domain is like this:
+
+<domain type='kvm'>                                                                                                                                                                                                                                                            
+  <name>os-1</name>                                                                                                                                                                                                                                                            
+  <uuid>34c41008-ab91-483b-959c-81a7a12ae9be</uuid>                                                                                                                                                                                                                            
+  <memory unit='KiB'>8388608</memory>                                                                                                                                                                                                                                          
+  <currentMemory unit='KiB'>8388608</currentMemory>                                                                                                                                                                                                                            
+  <memoryBacking>                                                                                                                                                                                                                                                              
+    <hugepages/>                                                                                                                                                                                                                                                               
+  </memoryBacking>                                                                                                                                                                                                                                                             
+  <vcpu placement='static' cpuset='10-11,34-35'>4</vcpu>                                                                                                                                                                                                                       
+  <os>                                                                                                                                                                                                                                                                         
+    <type arch='x86_64' machine='pc-i440fx-2.12'>hvm</type>                                                                                                                                                                                                                    
+    <loader type='pflash'>/var/lib/libvirt/qemu/nvram/os-1-ovmf.fd</loader>                                                                                                                                                                                                    
+    <boot dev='network'/>                                                                                                                                                                                                                                                      
+    <boot dev='hd'/>                                                                                                                                                                                                                                                           
+  </os>                                                                                                                                                                                                                                                                        
+  <features>                                                                                                                                                                                                                                                                   
+    <acpi/>                                                                                                                                                                                                                                                                    
+    <apic/>                                                                                                                                                                                                                                                                    
+  </features>                                                                                                                                                                                                                                                                  
+  <cpu mode='host-passthrough' check='partial'/>                                                                                                                                                                                                                               
+  <clock offset='utc'>                                                                                                                                                                                                                                                         
+    <timer name='rtc' tickpolicy='catchup'/>                                                                                                                                                                                                                                   
+    <timer name='pit' tickpolicy='delay'/>                                                                                                                                                                                                                                     
+    <timer name='hpet' present='no'/>                                                                                                                                                                                                                                          
+  </clock>                                                                                                                                                                                                                                                                     
+  <on_poweroff>destroy</on_poweroff>                                                                                                                                                                                                                                           
+  <on_reboot>restart</on_reboot>                                                                                                                                                                                                                                               
+  <on_crash>destroy</on_crash>                                                                                                                                                                                                                                                 
+  <pm>                                                                                                                                                                                                                                                                         
+    <suspend-to-mem enabled='no'/>                                                                                                                                                                                                                                             
+    <suspend-to-disk enabled='no'/>                                                                                                                                                                                                                                            
+  </pm>                                                                                                                                                                                                                                                                        
+  <devices>                                                                                                                                                                                                                                                                    
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>                                                                                                                                                                                                                           
+    <disk type='block' device='disk'>                                                                                                                                                                                                                                          
+      <driver name='qemu' type='raw' cache='none' io='native'/>                                                                                                                                                                                                                
+      <source dev='/dev/vg0/os-1-vda'/>                                                                                                                                                                                                                                   
+      <target dev='vda' bus='virtio'/>                                                                                                                                                                                                                                         
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>                                                                                                                                                                                              
+    </disk>                                                                                                                                                                                                                                                                    
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw' cache='none' io='native'/>
+      <source dev='/dev/vg0/os-1-vdb'/>
+      <target dev='vdb' bus='virtio'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0'/>
+    </disk>
+    <controller type='usb' index='0' model='ich9-ehci1'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x7'/>
+    </controller>
+    <controller type='usb' index='0' model='ich9-uhci1'>
+      <master startport='0'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0' multifunction='on'/>
+    </controller>
+    <controller type='usb' index='0' model='ich9-uhci2'>
+      <master startport='2'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x1'/>
+    </controller>
+    <controller type='usb' index='0' model='ich9-uhci3'>
+      <master startport='4'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x2'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <controller type='ide' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+    </controller>
+    <interface type='bridge'>
+      <mac address='52:54:00:78:cb:97'/>
+      <source bridge='virbr0'/>
+      <model type='rtl8139'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
+    </interface>
+    <interface type='bridge'>
+      <mac address='52:54:00:1c:4f:22'/>
+      <source bridge='virbr1'/>
+      <model type='rtl8139'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
+    </interface>
+    <serial type='pty'>
+      <target type='isa-serial' port='0'>
+        <model name='isa-serial'/>
+      </target>
+    </serial>
+    <console type='pty'>
+      <target type='serial' port='0'/>
+    </console>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <graphics type='vnc' port='-1' autoport='yes'>
+      <listen type='address'/>
+    </graphics>
+    <video>
+      <model type='cirrus' vram='16384' heads='1' primary='yes'/>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </video>
+    <memballoon model='virtio'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x09' function='0x0'/>
+    </memballoon>
+  </devices>
+</domain>
+
+where /var/lib/libvirt/qemu/nvram/os-1-ovmf.fd is a copy of
+/usr/share/edk2-ovmf/OVMF_VARS.fd. An the extract from my
+/etc/libvirt/qemu.conf to define ovmf:
+
+...
+# Location of master nvram file                                                                                                                                                                                                                                                
+#                                                                                                                                                                                                                                                                              
+# When a domain is configured to use UEFI instead of standard                                                                                                                                                                                                                  
+# BIOS it may use a separate storage for UEFI variables. If                                                                                                                                                                                                                    
+# that's the case libvirt creates the variable store per domain                                                                                                                                                                                                                
+# using this master file as image. Each UEFI firmware can,                                                                                                                                                                                                                     
+# however, have different variables store. Therefore the nvram is                                                                                                                                                                                                              
+# a list of strings when a single item is in form of:                                                                                                                                                                                                                          
+#   ${PATH_TO_UEFI_FW}:${PATH_TO_UEFI_VARS}.                                                                                                                                                                                                                                   
+# Later, when libvirt creates per domain variable store, this list is                                                                                                                                                                                                          
+# searched for the master image. The UEFI firmware can be called                                                                                                                                                                                                               
+# differently for different guest architectures. For instance, it's OVMF                                                                                                                                                                                                       
+# for x86_64 and i686, but it's AAVMF for aarch64. The libvirt default                                                                                                                                                                                                         
+# follows this scheme.                                                                                                                                                                                                                                                         
+nvram = [                                                                                                                                                                                                                                                                      
+   "/usr/share/edk2-ovmf/OVMF_CODE.fd:/usr/share/edk2-ovmf/OVMF_VARS.fd",                                                                                                                                                                                                      
+]
+...
+
+This setup used to work one month ago, now it's setup with:
+
+QEMU emulator version 3.1.0
+libvirt-5.0.0
+linux-4.19.20
+
+Any help appreciated.
+
+Best regards.
+
+José
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