rbradford

# ttyS0 interrupt present

root@cloud-hypervisor ~ # cat /proc/cmdline 
console=ttyS0 console=hvc0 root=/dev/vda3 quiet acpi=off

root@cloud-hypervisor ~ # cat /proc/interrupts 
           CPU0       
  4:          5   IO-APIC   4-edge      ttyS0
 24:          1   PCI-MSI 16384-edge      virtio0-config
 25:         50   PCI-MSI 16385-edge      virtio0-virtqueues

rbradford

apic.dat  dsdt.dat  dump.out  facp.dsl  mcfg.dsl  srat.dsl
apic.dsl  dsdt.dsl  facp.dat  mcfg.dat  srat.dat
cloud@cloud:~$ cat *.dsl
/*
 * Intel ACPI Component Architecture
 * AML/ASL+ Disassembler version 20160108-64
 * Copyright (c) 2000 - 2016 Intel Corporation
 * 
 * Disassembly of apic.dat, Fri Aug  9 12:18:33 2019

rbradford

diff -ur kata-linux-4.14.67-18/arch/x86/pci/legacy.c kata-linux-4.14.67-18.modified/arch/x86/pci/legacy.c
--- kata-linux-4.14.67-18/arch/x86/pci/legacy.c	2018-08-24 12:09:23.000000000 +0100
+++ kata-linux-4.14.67-18.modified/arch/x86/pci/legacy.c	2018-12-04 17:46:28.309874849 +0000
@@ -65,7 +65,7 @@
 		}
 	}
 
-	pcibios_fixup_peer_bridges();
+	//pcibios_fixup_peer_bridges();
 	x86_init.pci.init_irq();

rbradford

Ubuntu Cloud (xenial & bionic)

Works with NEMU and virt machine type. However boot hangs unless "console=hvc0" appended to kernel command line:

 sudo guestmount -i -a ~/workloads/xenial-server-cloudimg-amd64-uefi1.img /mnt
 sudo sed -i "s/console=tty1 console=ttyS0/console=tty1 console=ttyS0 console=hvc0/" /mnt/boot/grub/grub.cfg
 sudo umount /mnt