port-amd64/56361: NetBSD/amd64 install media boot failed in qemu/kvm with ovmf uefi firmware

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>Number:         56361
>Category:       port-amd64
>Synopsis:       NetBSD/amd64 install media boot failed in qemu/kvm with ovmf uefi firmware
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    port-amd64-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Aug 14 04:55:00 +0000 2021
>Originator:     DavyCrockett
>Release:        9.2_STABLE
>Organization:
>Environment:
>Description:
[ 1.7856246] uvm_fault(0xffffffff8151f6e0, 0xfffff32b08e3c000, 2) -> e
[ 1.7856246] fatal page fault in supervisor mode
[ 1.7856246] trap type 6 code 0x3 rip 0xffffffff8020985e cs 0x8 rflags 0x10246 cr2 0xfffff32b08e3c000 ilevel 0 rsp 0xffffb40043a34f70
[ 1.7856246] curlwp 0xfffff32b87312040 pid 0.2 lowest kstack 0xffffb40043a322c0
kernel: page fault trap, code=0
Stopped in pid 0.2 (system) at netbsd:sse2_idlezero_page+0x1e:
>How-To-Repeat:
ovmf from sysutils/ovmf
boot in qemu with script below
/usr/pkg/bin/qemu-system-x86_64 \
-vga none \
-nodefaults \
-serial mon:stdio \
-nographic \
-cpu host \
-smp 2 \
-m 2G \
-M q35,accel=kvm \
-drive file=edk2-x86_64-code.fd,if=pflash,format=raw,unit=0,readonly=on \
-device ich9-ahci,id=sata0 \
-device ide-cd,drive=cdrom0,bus=sata0.0 \
-drive if=none,id=cdrom0,file=netbsd.iso,media=cdrom
netbsd.iso is https://nycdn.netbsd.org/pub/NetBSD-daily/netbsd-9/latest/images/NetBSD-9.2_STABLE-amd64.iso
>Fix: