BTW I previously tried using the Unicorn engine for embedded dynarec. While this is an awesome piece of software, based on Qemu, it didn't really fit my bare-metal needs.
So I started my own dynarec engine, inspired by Bleem, beginning with RV32 then aarch64 then the ultimate monster: x86_64
![Screenshot of the Diosix RISC-V Hypervisor interface running inside a QEMU window, displaying the "Controls & Icons" configuration tab. This is a demonstration, WIP view of the available icons and windows.
A dark-themed graphical interface inside a QEMU desktop window with the navigation bar set to "2: CONTROLS & ICONS". The main view is split into three sections:
Interactive Controls Showcase (Left): Displays interactive UI elements including a live telemetry tick counter, a text input labeled "Diosix RISC-V Hypervisor", sliders for glass opacity (78%), Gaussian blur (100%), and VCPU quota allocation (75%), along with an enabled checkbox for verbose telemetry.
Backdrop Gradient Color Selection (Right): Radio options for top and bottom background gradient colors, with "Sunset Amber (#C86840)" selected for the top and "Pitch Black (#000206)" selected for the bottom.
Live Callback Inspector (Bottom): A single console event line logging [BACKDROP TOP] Selected 'Sunset Amber (#C86840)' (#0xC86840).](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:fz5wxxs5nmnf2tmwutgerlpb/bafkreidt6stlr4d2gq6u54s42h43bgupt3224ra7rubbbpzenj7ertkjxa)
![Screenshot of debug output from running an x86_64 guest on a 64-bit RISC-V hypervisor using emulation. The Linux guest's console output is mixed with the hypervisor's trace logs. The output shown includes:
tb_gen_code: translating guest TB at pc = anyopaque@ffffffff8128b283
tb_gen_code: translating guest TB at pc = anyopaque@ffffffff8128b287
[ 0.000000] Linux version 7.0.10 (chris@violet) (x86_64-buildroot-linux-gnu-gcc.br_real (Buildroot 2026.02.3) 14.3.0, GNU ld (GNU Binutils) 2.44) #2 SMP PREEMPT_DYNAMIC Tue Jun 30 22:46:55 PDT 2026
tb_gen_code: translating guest TB at pc = anyopaque@ffffffff8128b2e4
tb_gen_code: translating guest TB at pc = anyopaque@ffffffff8128b2ee
[...]
tb_gen_code: translating guest TB at pc = anyopaque@ffffffff818bfc0e
[ 0.000000] Command line: console=ttyS0 earlyprintk=serial,ttyS0,115200 root=/dev/ram0 rw
[ 0.000000] Disabled fast string operations
[ 0.000000] x86/CPU: tb_gen_code: translating guest TB at pc = anyopaque@ffffffff8128b2d9
model not found in latest microcode list
[ 0.000000] BIOS-provided physical RAM map:
[ 0.000000] BIOS-e820: [gap 0x0000000000000000-0x0000000007fffffff]
[ 0.000000] tb_gen_code: translating guest TB at pc = anyopaque@ffffffff818bfe96
[ 0.000000] BIOS-e820: [mem 0x0000000080000000-0x000000009fffffff] System RAM
[ 0.000000] printk: legacy bootconsole [earlyser0] enabled
tb_gen_code: translating guest TB at pc = anyopaque@ffffffff81325af9
tb_gen_code: translating guest TB at pc = anyopaque@ffffffff8132622d](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:fz5wxxs5nmnf2tmwutgerlpb/bafkreiam34jhcfm3x6t74apwbmfj64zdx73itkw5zhnlrhco6j6c6rlply)
![OpenSBI v1.5.1
____ _____ ____ _____
/ __ \ / ____| _ \_ _|
| | | |_ __ ___ _ __ | (___ | |_) || |
| | | | '_ \ / _ \ '_ \ \___ \| _ < | |
| |__| | |_) | __/ | | |____) | |_) || |_
\____/| .__/ \___|_| |_|_____/|____/_____|
| |
|_|
Platform Name : riscv-virtio,qemu
Platform Features : medeleg
Platform HART Count : 1
Platform IPI Device : aclint-mswi
Platform Timer Device : aclint-mtimer @ 10000000Hz
Platform Console Device : uart8250
Platform HSM Device : ---
Platform PMU Device : ---
Platform Reboot Device : syscon-reboot
Platform Shutdown Device : syscon-poweroff
Platform Suspend Device : ---
Platform CPPC Device : ---
Firmware Base : 0x80000000
Firmware Size : 319 KB
Firmware RW Offset : 0x40000
Firmware RW Size : 63 KB
Firmware Heap Offset : 0x47000
Firmware Heap Size : 35 KB (total), 2 KB (reserved), 10 KB (used), 22 KB (free)
Firmware Scratch Size : 4096 B (total), 244 B (used), 3852 B (free)
Runtime SBI Version : 2.0
Boot HART ID : 0
Boot HART Domain : root
Boot HART Priv Version : v1.12
Boot HART Base ISA : rv32imafdch
Boot HART ISA Extensions : sstc,zicntr,zihpm,zicboz,zicbom,sdtrig,svadu
Boot HART PMP Count : 16
Boot HART PMP Granularity : 2 bits
Boot HART PMP Address Bits: 32
Boot HART MHPM Info : 16 (0x0007fff8)
Boot HART Debug Triggers : 2 triggers
Boot HART MIDELEG : 0x00001666
Boot HART MEDELEG : 0x00f0b509
[ snipped ]
virtio-blk: capacity is 0 bytes
file: hello.txt, size=83
file: meow.txt, size=6
> hello
Hello world from shell!](https://cdn.bsky.app/img/feed_thumbnail/plain/did:plc:fz5wxxs5nmnf2tmwutgerlpb/bafkreic6fz2ujullzpcou7bhwdpdlbptujdtdbgmeo2khyepmhqct7tlia)
