I have re-compiled gcc-9 from Focal after adding it to the list of releases which do not enable cf-protection by default. Then compiled Xen from Focal with that compiler. And it does boot!
# xen info host : argabuthon release : 5.4.0-14-generic version : #17-Ubuntu SMP Thu Feb 6 22:47:59 UTC 2020 machine : x86_64 nr_cpus : 8 max_cpu_id : 15 nr_nodes : 2 cores_per_socket : 8 threads_per_core : 1 cpu_mhz : 2000.014 hw_caps : 178bf3ff:80802001:ee500800:000837ff:00000000:00000000:00000000:00000100 virt_caps : hvm total_memory : 32766 free_memory : 29333 sharing_freed_memory : 0 sharing_used_memory : 0 outstanding_claims : 0 free_cpus : 0 xen_major : 4 xen_minor : 11 xen_extra : .4-pre xen_version : 4.11.4-pre xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p hvm-3.0-x86_64 xen_scheduler : credit xen_pagesize : 4096 platform_params : virt_start=0xffff800000000000 xen_changeset : xen_commandline : placeholder dom0_max_vcpus=4 dom0_vcpus_pin=true dom0_mem=3072M,max:3072M loglvl=all guest_loglvl=all hvm_debug=0 com2=115200,8n1 console=com2,vga cc_compiler : gcc (Ubuntu 9.2.1-30ubuntu2+nocfprot1) 9.2.1 20200228 cc_compile_by : ubuntu-devel-di cc_compile_domain : lists.ubuntu.com cc_compile_date : Tue Mar 3 07:31:57 UTC 2020 build_id : e9eeb5132ed2948c175c17be4b1c47edded6d7be xend_config_format : 4 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1863260 Title: gcc-9 in Ubuntu generate unbootable xen hypervisor To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gcc-9/+bug/1863260/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
