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When pc-sysfw.rom_only == 0, flash memory will be usable with kvm. In order to enable flash memory mode, a pflash device must be created. (For example, by using the -pflash command line parameter.) Usage of a flash memory device with kvm requires KVM_CAP_READONLY_MEM, and kvm will abort if a flash device is used with an older kvm which does not support this capability. If a flash device is not used, then qemu/kvm will operate in the original rom-mode. Signed-off-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Message-id: 1369816047-16384-5-git-send-email-jordan.l.justen@intel.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>