Re: NOVA, NUL, snapshotting

"Sartakov A. Vasily" <[email protected]> Tue, 1 Oct 2013 18:19:02 +0400

Newsgroups	gmane.comp.micro-kernel.l4.devel
Message-ID	<[email protected]>

Hello. 


> > Is that enough? What should I do with mappings (NPT in particular
> > caused me questions), devices?
> 
> ... you need to save and restore device state. Jacek Galowicz has
> implemented this already. For a short overview of what he did check:
> https://github.com/TUD-OS/seoul/issues/12

I understand that issue. But I do not understand how multiboot/vbios part works. Can you explain me what happens from 
handle_cpu_init (cpu.cc) to main function (or __start ) of munich. I.e. in range from message "reset CPU state" and first console message of Munich. 
I do not need full detailed description, just main idea. 
I stuck on very early stage of VM booting. I see intensive messaging of VBios, Lapic, RTC, Serial, I have got several traps (I count svm_invalid trap), but I seriously do not see the reason, the code that trigger traps. 

> I understand the VMM-specific code will be published at some point.
> 
> > What is the cpu state in receive function of vbios_multiboot? Is it
> > a beginning state of VM, when the Munech is uploaded?
> 
> This function is called whenever some code issues int 19h to (re)start
> the BIOS boot procedure. Initially this is called by the vBIOS itself.
> I am not sure what you mean with your second question.
> 
> Julian
> 

-- 
Sartakov A. Vasily
[email protected]

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