Jesper Wallin <[email protected]> writes:
> On Sun, Dec 07, 2025 at 01:29:02PM +0000, Jan Schreiber wrote:
>> > to 4.12.2025 klo 0.16 Dave Voutila ([email protected]) kirjoitti:
>> >
>> > Boots with APU2 7.8 stable: hw.model=AMD GX-412TC SOC
>> > and with Thinkpad L450 less than month current: hw.model=Intel(R)
>> > Core(TM) i5-5200U CPU @ 2.20GHz
>> >
>> > Best regards,
>> > Hannu Vuolasaho
>>
>> Since I also have a Ryzen CPU I tried with MMIO_NOTYET 1 (which didn't work,
>> see x86_vm.c).
>> With that change the arch iso boots into the installer and I can login as
>> root.
>>
>> I did not dare to go down the arch install path.
>>
>
> Hi,
>
> I can confirm that your patch makes booting a full Arch system possible.
> This is on 7.8-current (#141: Sun Dec 7 23:11:25 MST 2025) and the VM
> runs the most recent version of Arch, as of today.
Enabling mmio emulation on vmd is a use-at-your-own-risk situation at
the moment. It's incomplete and will expose you to data corruption and
potentially security issues.
>
> This is on a Lenovo ThinkPad X395 with:
> hw.model=AMD Ryzen 7 PRO 3700U w/ Radeon Vega Mobile Gfx
>
> The output from booting:
> --8<--
> vmd: started arch (vm 2) successfully, tty /dev/ttyp5
> vm/arch: vmd: cpu mode LONG detected
> vmd: got bytes: [ 8b 07 e9 27 34 7f 00 83 e8 01 48 89 fe 48 c7 ]
> vm/arch: vmd: prefixes {g1: 0x00, g2: 0x00, g3: 0x00, g4: 0x00, rex: 0x00 }
> vm/arch: vmd: found opcode MOV (operand encoding RM) (MORE)
> vm/arch: vmd: found ModRM 0x07 (MORE)
> vm/arch: insn_decode: final instruction length is 2
> vm/arch: instruction { MOV, enc=RM, len=2, mod=0x07, (reg=RAX,
> addr=0xffffcecb000453c0) sib=0x00 }
> vm/arch: insn_decode: modrm: {mod: 0, regop: 0, rm: 7}
> vm/arch: vmd: RAX 0xffffcecb000453c0
> vm/arch: vmd: RCX 0xfed803c3
> vm/arch: vmd: RDX 0xfffff
> vm/arch: vmd: RBX 0xffffcecb000453c0
> vm/arch: vmd: RSP 0xffffcecb0000bdd8
> vm/arch: vmd: RBP 0xffff8b6c8007f280
> vm/arch: vmd: RSI 0xfed803c0
> vm/arch: vmd: RDI 0xffffcecb000453c0
> vm/arch: vmd: R8 0x0
> vm/arch: vmd: R9 0xfed80
> vm/arch: vmd: R10 0xfed80
> vm/arch: vmd: R11 0xfed81000
> vm/arch: vmd: R12 0xffffcecb0000be00
> vm/arch: vmd: R13 0xffffffffa6eb6710
> vm/arch: vmd: R14 0xffffcecb0000bf48
> vm/arch: vmd: R15 0x0
> vm/arch: vmd: RIP 0xffffffffa4d9a952
> vm/arch: vmd: RFLAGS 0x292
> vm/arch: vmd: ES { sel: 0x0000, lim: 0xffffffff, ar: 0x00000000, base: 0x0 }
> vm/arch: vmd: CS { sel: 0x0010, lim: 0xffffffff, ar: 0x0000209b, base: 0x0 }
> vm/arch: vmd: GS { sel: 0x0018, lim: 0xffffffff, ar: 0x0000c093, base: 0x0 }
> vm/arch: vmd: DS { sel: 0x0000, lim: 0xffffffff, ar: 0x00000000, base: 0x0 }
> vm/arch: vmd: FS { sel: 0x0000, lim: 0xffffffff, ar: 0x00000000, base: 0x0 }
> vm/arch: vmd: GS { sel: 0x0000, lim: 0xffffffff, ar: 0x00000000, base:
> 0xffff8b6de0909000 }
> vm/arch: vmd: LDTR { sel: 0x0000, lim: 0x0000ffff, ar: 0x00000000, base: 0x0 }
> vm/arch: vmd: TR { sel: 0x0040, lim: 0x00004087, ar: 0x00000089, base:
> 0xfffffe6dd1cda000 }
> --8<--
>
>
> Jesper Wallin
