Re: lug-bg: Obst swap dql

[pope@xxxxxxxxxx (Alex Pope)]

On Sun, 21 May 2000, Julian Stoev wrote:

> On Sun, May 21, 2000 at 12:40:57PM +0300, Alex Pope wrote:
> |On Sun, 21 May 2000, Julian Stoev wrote:
> |
> |> On Sat, May 20, 2000 at 04:26:16PM +0300, Stanislav Grozev wrote:
> |> |On Sat, May 20, 2000 at 02:07:11PM +0300, Georgi Chorbadzhiyski wrote:
> |> |> 
> |> |> Niama takiva raboti da polzva kernel-a, wizh kakvo kazva Alan Cox za vmware
> |> |> 
> |> |> "Vmware isnt a unix application constrained by the OS. It does hardware
> |> |> level stuff of its own,"
> |> |> 
> |> |
> |> Pa dajte da vidime koe i kak e po tozi vypros. Kyde e problema i ima
> |> li problem izobshto. vmware user space programa li e izcialo ili
> |> niakakva chast raboti i s prioritet na kernel? Kernela li "koli i
> |> besi" ili vmware samo si byrka po hardware-to? Temata ima obshto i s
> |> user-space kernelite sigurno, a ot tam i s hurd, ako shtete... 
> |
> |http://www.vmware.com/products/virtualplatform.html
> |
> |mislia che tam obshto vzeto vsichko e kazano.
> |s dve dumi - ima komponent koito vyrvi v privileged mode, tova e
> |t.nar. Virtual Platform Monitor (moje bi tova e modula vmmon.o). drug e
> |vyprosa kakvo tochno pravi toi. tvyrdi se che izpolzva neshto narecheno
> |"direct execution", za da se namali virtualization overhead-a, niakakyv
> |vid harduerno multiplexirane, i tochno tova otlichava vmware ot edin
> |obiknoven API emulator. vse pak, celia management na sistemnite resursi
> |se izvyrshva ot host OS-a. user-space chastta na vmware pyk comunikira s
> |monitora chrez device driver, narechen Virtual Platform Driver.
> |
> 
> 
> Za zyzalenie tam ima dosta razmiti izkazvania, koeto ne e
> uchudvashto za komersialno prilozenie.
> 
> "For maximum portability, the device-dependent portions of
> the system use the application personality and rely on the host
> operating system and its device-specific driver".
> 
> "Virtual Platform (VP) Monitor - The monitor portion of Virtual
> Platform runs in privileged mode directly on top of the hardware."
>                  ^^^^^^^^^^
> Ta znachi az ne razbrah - vyzmozno li e da se mount-ne edin i syshti
> partition ednovremenno? Ako - da, tova problem li e i ako pak - da,
> kyde e tozi problem? 
> 
> Cheta eto tozi pasaz "Isolation - The Virtual Platform uses hardware
> protection mechanisms to isolate virtual machines from each other, and
> virtual machines from the host operating system. This isolation does
> not make any assumptions concerning the software that runs within the
> virtual machine.  Even a rogue application or operating system is
> confined to the VMware Virtual Platform sandbox."
> 
> ... i ostavam s vpechatlenieto, che podoben dostyp bi triabvalo da e
> nevyzmozen. 
> 
> Ako obache toi e vyzmozen, to tova e bug. Kyde?
> Spored men otgovoryt moze da byde samo edin - vyv vmmon.o, kojto
> raboti vyv *privileged* mode i sledovatelno ima vyzmoznost da
> zaobikalia zashtitite na kernela sreshtu glupaci. Tova - dobre, ama
> samia toi triabva da se grizi za tezi glupaci v takyv sluchai i da
> otkazva dostyp, kogato daden partition e mount-nat veche. Logichno?
> Tova oznachava, che kernelyt ne e "vinoven". Toj ne moze da se
> zashtiatava ot kod rabotesht v privileged mode. 
> 
> 
> --JS

raw disk partition moje da byde mount-nat i da se polzva ednovremenno ot
host i guest operacionnite sistemi. cheti na
http://www.vmware.com/support/reference/linux/rawdisk_linux.html
pasaja Risks in Using Raw Disks.
" ... you should ensure that your host operating system doesn't "see" the
partitions with which your guest operating system works."
e kak shte stane tova ako naprimer moiata host OS e instalirana na tozi
partition.
ostavam s vpechatlenieto che vmware ne e napravena za glupaci :)

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