Hi tech-kern@, This post is related to iMil's recent work on PVH support for NetBSD/amd64. I was unable to use his work to boot on ramdisks directly with QEMU's - initrd flag, when using -kernel.
Well after a deep dive into it, I think I am almost there: https://git.edgebsd.org/gitweb/? p=src.git;a=commitdiff;h=629621f41089af50584214a4d32b50ae8ee414f2 This patch: - extends sys/arch/amd64/amd64/genassym.cf for additional knowledge of Xen's hvm_start_info (notably nr_modules and modlist_paddr) - extends .start_genpvh in locore.S to copy the module entries, and their respective command lines and contents - teaches x86_machdep.c to load Xen modules when a VM_GUEST_GENPVH guest The code is not working yet unfortunately. On an Intel-macOS host: $ qemu-system-x86_64 -m 512 -accel hvf -cpu host -display none -serial \ stdio -kernel netbsd-GENERIC -initrd ramdisk-cgdroot.fs -append \ "console=com rw -v" -action reboot=shutdown -D qemu.log -d \ cpu_reset,in_asm,guest_errors,unimp -drive \ file=ld0.img,format=raw,if=virtio [...] [ 4.5370781] boot device: ld0 [ 4.5370781] md0: internal 5000 KB image area [ 4.5370781] root on md0a dumps on md0b [ 4.5370781] uvm_fault(0xffffffff81912da0, 0xffffffff9faf8000, 1) -> e [ 4.5370781] fatal page fault in supervisor mode [ 4.5370781] trap type 6 code 0 rip 0xffffffff80ff3274 cs 0x8 rflags 0x10206 cr2 0xffffffff9faf8ff8 ilevel 0 rsp 0xffffffff81a07c38 [ 4.5484101] curlwp 0xffffffff8188bfc0 pid 0.0 lowest kstack 0xffffffff81a022c0 kernel: page fault trap, code=0 Stopped in pid 0.0 (system) at ffffffff80ff3274: movq fffffffffffffff8 (%rsi,%rdx,1),%r10 It seems to fail in bdev_strategy(); as of right now I do not know why. I suspect my assembly code in locore.S to need review in particular. Therefore: your help in completing this is very welcome. Cheers & HTH, -- khorben
