FreeBSD enablement for ARM64 in Hyper-V

[schakrabarti_microsoft.com]

Summary

These are the common files and make file changes to enable FreeBSD for ARM64 in Hyper-V.

[emaste]

sys/arm64/conf/std.dev

112

I think this probably does not belong in std.dev, since it would then be included in SOC-specific kernels which do not run in Hyper-V. std.virt perhaps?

[andrew]

There are a few places you check for !aarch64. I think these would be better if you check for amd64 || i386 to document which architectures the code is for.

sys/arm64/conf/std.dev

112

It should be in std.hyperv. See D36776 for an example of a std.* file being added. In that case AWS.

sys/dev/hyperv/vmbus/vmbus_var.h

160

This should be checking for amd64 or i386

sys/modules/hyperv/vmbus/Makefile

21

This should be checking for amd64 or i386

[andrew]

Can you rebase this on a recent main? I'm getting conflicts while trying to apply it.

[maciphone2_googlemail.com]

after bisecting it seems this commit causes RPI4b (early model) to hang on (pxe-)boot short before starting CPUs :

FreeBSD 14.0-CURRENT #19 main-n258880-41b51c5030b: Fri Oct 28 18:33:50 CEST 2022
    root@fbsdr5pro:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC-MMCCAM arm64
FreeBSD clang version 14.0.5 (https://github.com/llvm/llvm-project.git llvmorg-14.0.5-0-gc12386ae247c)
WARNING: WITNESS option enabled, expect reduced performance.
VT(efifb): resolution 1824x984
--hang here--

a git hard reset to previous commit 9349fc283b581a52396b6027bfa792e61dfd8035 brought the machine back to boot.

Regards
K.

[mmel]

sys/arm64/conf/std.dev

112

You seem to have forgotten to delete this line from the committed version.

[andrew]

In D36744#844334, @maciphone2_googlemail.com wrote:

after bisecting it seems this commit causes RPI4b (early model) to hang on (pxe-)boot short before starting CPUs :

I've hopefully disabled building hyperv support in the kernel until the boot issue on non-hyperv is fixed.

[maciphone2_googlemail.com]

In D36744#844436, @andrew wrote:

In D36744#844334, @maciphone2_googlemail.com wrote:

after bisecting it seems this commit causes RPI4b (early model) to hang on (pxe-)boot short before starting CPUs :

I've hopefully disabled building hyperv support in the kernel until the boot issue on non-hyperv is fixed.

thank you,
since, as you said before, this commit D36744 has many git conflicts
I'll try to rebase to current including your last commit and then recompile.

[maciphone2_googlemail.com]

In D36744#844436, @andrew wrote:

I've hopefully disabled building hyperv support in the kernel until the boot issue on non-hyperv is fixed.

yep, machine is alive and in sync with current again :

--------------------------------------------------------------
>>> Installing kernel GENERIC-MMCCAM completed on Fri Oct 28 23:46:35 CEST 2022
--------------------------------------------------------------
root@fbsdr5pro:/usr/src # git rev-parse --short HEAD                            aba921bd9e1
.... pxe-boot:--
root@:~ # uname -a
FreeBSD  14.0-CURRENT FreeBSD 14.0-CURRENT #22 main-n258900-aba921bd9e1: Fri Oct 28 23:44:04 CEST 2022     root@fbsdr5pro:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC-MMCCAM arm64
}

thank you!