On Wed, Mar 25, 2020 at 07:44:34PM +0100, Igor Mammedov wrote:
> On Wed, 25 Mar 2020 16:03:39 +0100
> Gerd Hoffmann <kra...@redhat.com> wrote:
>
> > On Wed, Mar 25, 2020 at 01:32:12PM +0100, Igor Mammedov wrote:
> > > On Thu, 19 Mar 2020 09:01:04 +0100
> > > Gerd Hoffmann <kra...@redhat.com> wrote:
> > >
> > > > I know that not supporting ACPI in microvm is intentional. If you still
> > > > don't want ACPI this is perfectly fine, you can use the usual -no-acpi
> > > > switch to toggle ACPI support.
> > > >
> > > > These are the advantages you are going to loose then:
> > > >
> > > > (1) virtio-mmio device discovery without command line hacks (tweaking
> > > > the command line is a problem when not using direct kernel boot).
> > > > (2) Better IO-APIC support, we can use IRQ lines 16-23.
> > > > (3) ACPI power button (aka powerdown request) works.
> > > > (4) machine poweroff (aka S5 state) works.
> > > >
> > > > Together with seabios patches for virtio-mmio support this allows to
> > > > boot standard fedora images (cloud, coreos, workstation live) with the
> > > > microvm machine type.
> > >
> > > what CLI do you use to test it?
> >
> > Test script below. "qemu-default" is a wrapper script which starts
> > qemu-system-x86_64 from my build directory. "qemu-firmware" is the
> > same plus isa-debugcon configured for a firmware log on stdout.
> >
> > Latest bits (with some of the review comments addressed) just pushed
> > to git://git,kraxel.org/qemu sirius/microvm
>
> thanks, below are test results I got on my system,
> spoiler hw-reduced reduces boot time on ~0.02s compared to full blown acpi
> ----
> using timestamp at "Run /init as init process" as measuring point
>
> no acpi
> 1.967316
> 1.975272
> 1.981267
> 1.974316
> 1.962452
> 1.960988
>
> hw reduced acpi
> 0.893838
> 0.892573
> 0.890585
> 0.900306
> 0.897902
>
> normal acpi:
> 0.921647
> 0.916298
> 0.923518
> 0.916298
> 0.913234
>
> PS:
> I just quickly hacked hw-reduced acpi (using arm/virt as model)
> without implementing power button but I doubt that would affect results
> noticeably
> on qemu side it probably also will save some time since there are less
> things to setup for qemu.
And no ACPI is faster because of PS/2 probing, right?
> >
> > HTH,
> > Gerd
> >
> > ============================ cut here ============================
> > #!/bin/sh
> >
> > mode="${1}"
> > shift
> >
> > back=()
> > devs=()
> > args=()
> > qemu="qemu-firmware -monitor none -boot menu=on"
> > disk=""
> > liso=""
> > krnl=""
> > karg="console=ttyS0,115200"
> >
> > case "$mode" in
> > kernel)
> > qemu="qemu-default -nographic"
> > disk="/vmdisk/imagefish/rhel-8.1.0-ks-x86_64-testboot-sys-disk.qcow2"
> > krnl="$HOME/build/linux-sirius-x86_64-qemu/arch/x86/boot/bzImage"
> > karg="$karg root=/dev/sda4"
> > karg="$karg quiet"
> > ;;
> > seabios)
> > disk="/vmdisk/imagefish/rhel-8.1.0-ks-x86_64-testboot-sys-disk.qcow2"
> > krnl="$HOME/build/linux-sirius-x86_64-qemu/arch/x86/boot/bzImage"
> > karg="$karg root=/dev/sda4"
> > args+=("-bios"
> > "/home/kraxel/projects/seabios/out-bios-microvm/bios.bin")
> > ;;
> > cloud)
> > disk="/vmdisk/iso/Fedora-Cloud-Base-31-1.9.x86_64.raw"
> > ;;
> > coreos)
> > disk="/vmdisk/iso/fedora-coreos-31.20200210.3.0-metal.x86_64.raw"
> > ;;
> > live)
> > liso="/vmdisk/iso/Fedora-Workstation-Live-x86_64-30-1.2.iso"
> > devs+=("-device" "virtio-gpu-device")
> > devs+=("-device" "virtio-keyboard-device")
> > devs+=("-device" "virtio-tablet-device")
> > ;;
> > *)
> > echo "unknown mode: $mode"
> > echo "known modes: kernel seabios cloud coreos live"
> > exit 1
> > ;;
> > esac
> >
> > if test "$disk" != ""; then
> > format="${disk##*.}"
> > back+=("-drive" "if=none,id=disk,format=${format},file=${disk}")
> > devs+=("-device" "scsi-hd,drive=disk,bootindex=1")
> > fi
> > if test "$liso" != ""; then
> > back+=("-drive"
> > "if=none,id=cdrom,media=cdrom,readonly,format=raw,file=${liso}")
> > devs+=("-device" "scsi-cd,drive=cdrom,bootindex=2")
> > fi
> > if test "$krnl" != ""; then
> > args+=("-kernel" "$krnl")
> > args+=("-append" "$karg")
> > fi
> >
> > set -ex
> > $qemu \
> > -enable-kvm \
> > -cpu host \
> > -M microvm,graphics=off,pit=off,pic=on,rtc=on \
> > \
> > -m 4G \
> > \
> > -netdev user,id=net \
> > "${back[@]}" \
> > \
> > -global virtio-mmio.force-legacy=false \
> > -device virtio-net-device,netdev=net \
> > -device virtio-scsi-device \
> > "${devs[@]}" \
> > \
> > "${args[@]}" \
> > "$@"
