bhyve We have booted Debian with qemu accelerated with bhyve/vmm for the first time. This is an epic milestone for FreeBSD and for everyone.

ZioMario

ZioMario

Hello to everyone.

After a 2 days of full work,we have booted Debian with qemu accelerated with bhyve/vmm for the first time. This is an epic milestone for FreeBSD and for every FreeBSD lover.


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Further development is needed...a lot of development...but anyway this is a storic moment....we can use another hypervisor. This time in cooperation with the storic and mature qemu. FreeBSD is second to none.

This success has been possible thanks to the competence of @Abhinav Chavali who started this project for the GSOC 2025 ; thanks bro.

If someone wants to help the development,tell me. We have shared the code on github to continue the development.
 
bakul said:
Is this the same as https://github.com/dumrich/qemu or built on top of it or something else?
Click to expand...

It's built on top of dumrich's work. Specifically:

- QEMU side: We started from https://github.com/dumrich/qemu branch accel-vmm (his GSoC 2025 code)
and applied 8 patches on top — restructured the meson build, rewrote bhyve-all.c with proper VMX
segment descriptor conversion, added MMIO userspace fallback, fixed i8259/IOAPIC interrupt
delivery, etc.

- Kernel side: We started from dumrich's FreeBSD 16.0-CURRENT fork (with the vmm.ko QEMU support)
and applied 4 kernel patches — IOAPIC MMIO routed to userspace (so QEMU's own IOAPIC model handles
it), HLT returns to userspace, and debug printfs in vmx_inject_interrupts/vlapic_pending_intr
that accidentally fixed a timer race condition.

The original dumrich code could enter VMX and run SeaBIOS but would hang or crash before booting a
real OS. Our patches fix the critical bugs (NULL deref, ENAMETOOLONG, segment descriptor sync,
interrupt delivery) that blocked a full guest boot. With all patches applied, Debian 13 boots to a
login shell in ~3 seconds with -accel bhyve.
 
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