From: Anthony Liguori <aliguori@us.ibm.com>
To: Andi Kleen <andi@firstfloor.org>
Cc: xen-devel@lists.xensource.com, Keir Fraser <keir@xensource.com>,
"Nakajima, Jun" <jun.nakajima@intel.com>
Subject: Re: [PATCH][RFC] Emulating real mode with x86_emulate
Date: Fri, 30 Mar 2007 17:00:54 -0500 [thread overview]
Message-ID: <460D8896.9050606@us.ibm.com> (raw)
In-Reply-To: <20070330212548.GA10338@one.firstfloor.org>
Andi Kleen wrote:
>> There are some hard problems with migrating into QEMU. Namely, the code
>> that QEMU generates isn't SMP safe (atomic instructions lose their
>> atomicity)
>>
>
> I see.
>
> You're worrying that real mode startup trampolines of OS rely
> on atomic instructions? I can't think of much other possible real mode
> multi CPU code.
>
No, that's a concern for using V2E to handle 32 bit code. The big
problem for handling real mode code is dealing with synchronization for
device state. With the devices split between QEMU and within the
hypervisor, this becomes even more complicated.
Any of the interesting guests that use big real mode also depend on
being able to synchronize this device state.
Regards,
Anthony Liguori
> -Andi
>
prev parent reply other threads:[~2007-03-30 22:00 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-03-25 23:35 [PATCH][RFC] Emulating real mode with x86_emulate Anthony Liguori
2007-03-29 21:17 ` Kamble, Nitin A
2007-03-29 23:24 ` Anthony Liguori
2007-03-29 23:52 ` Kamble, Nitin A
2007-03-30 0:11 ` Anthony Liguori
2007-03-30 0:59 ` Kamble, Nitin A
2007-03-30 2:20 ` Kamble, Nitin A
2007-03-30 3:20 ` Anthony Liguori
2007-03-30 3:55 ` Anthony Liguori
2007-03-30 18:53 ` Kamble, Nitin A
2007-03-30 19:00 ` Anthony Liguori
2007-03-30 21:08 ` Kamble, Nitin A
2007-03-30 21:24 ` Kamble, Nitin A
2007-03-30 22:11 ` Anthony Liguori
2007-04-02 18:45 ` Kamble, Nitin A
2007-04-02 18:54 ` Anthony Liguori
2007-04-02 23:52 ` Kamble, Nitin A
2007-04-03 6:25 ` Keir Fraser
2007-04-03 14:03 ` Anthony Liguori
2007-04-05 1:24 ` Kamble, Nitin A
2007-03-30 22:10 ` Andi Kleen
2007-03-30 21:20 ` Anthony Liguori
2007-03-30 21:25 ` Andi Kleen
2007-03-30 22:00 ` Anthony Liguori [this message]
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