Re: Grub-devel Digest, Vol 163, Issue 18

[Lennart Sorensen]

On Wed, Sep 20, 2017 at 04:59:58PM +, Oleksii Kurochko wrote:
> After all there is only one interrupt controller, keyboard, PCI bus,
> video card, etc (at least usually).
> 
> Generally this is not problem because of each CPU has own APIC and we can
> handle some interrupts in one OS and some in other OS.

Still have to coordinate who owns what memory, firmware accesses (the
firmware only expects one OS to be running at a time), etc.

PCs were not designed to be hardware partitioned.

This is clearly not a normal thing, not supported by generic OSs, and
certainly not by generic boot loaders (and since the OSs need to agree
on it, you might as well have one OS load the other in that case and
not have the boot loader involved in the first place).

-- 
Len Sorensen

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Re: Grub-devel Digest, Vol 163, Issue 18

[Oleksii Kurochko]

After all there is only one interrupt controller, keyboard, PCI bus,
video card, etc (at least usually).

Generally this is not problem because of each CPU has own APIC and we can
handle some interrupts in one OS and some in other OS.


ср, 20 сент. 2017 г. в 19:01, :

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> Today's Topics:
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>1. Boot 2 Linux simultineously (Oleksii Kurochko)
>2. Re: Boot 2 Linux simultineously (Lennart Sorensen)
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> --
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> Message: 1
> Date: Wed, 20 Sep 2017 12:20:54 +
> From: Oleksii Kurochko 
> To: grub-devel@gnu.org
> Subject: Boot 2 Linux simultineously
> Message-ID:
> <
> cafgoghk3qpz0o4ijakcxrvci+_gekzzrrppwfby-nf+vfw2...@mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello.
>
> I want to boot on each processor ( 2 CPUs ) Linux kernel.
>
> By fast looking on it I did not see any SMP patches.
> Is it some SMP support in the GRUB?
>
> With best regards,
>  inisider
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> Message: 2
> Date: Wed, 20 Sep 2017 10:43:17 -0400
> From: lsore...@csclub.uwaterloo.ca (Lennart Sorensen)
> To: The development of GNU GRUB 
> Subject: Re: Boot 2 Linux simultineously
> Message-ID: <20170920144317.ttouj73e74257...@csclub.uwaterloo.ca>
> Content-Type: text/plain; charset=us-ascii
>
> On Wed, Sep 20, 2017 at 12:20:54PM +, Oleksii Kurochko wrote:
> > I want to boot on each processor ( 2 CPUs ) Linux kernel.
> >
> > By fast looking on it I did not see any SMP patches.
> > Is it some SMP support in the GRUB?
>
> You can only boot one OS on a machine unless you use virtualization.
>
> After all there is only one interrupt controller, keyboard, PCI bus,
> video card, etc (at least usually).
>
> grub boots one OS since that is all you can do on normal hardware.
>
> --
> Len Sorensen
>
>
>
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