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[Qemu-devel] Re: [PATCH] Snapshot block device support

From: Fabrice Bellard
Subject: [Qemu-devel] Re: [PATCH] Snapshot block device support
Date: Sun, 06 Jul 2003 16:08:13 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:0.9.9) Gecko/20020408

Rusty Russell wrote:
In message <address@hidden> you write:

I tested with 2.5.74 and fixed the initial IDE error. I also added the
emulation of the PC 'reset' pin so that vl can be shut down as a normal Linux system (only hard reset is supported, not power off, as it would require a more complicated real mode APM bios emulation).

I know someone who might be interested: I'll ask tomorrow.


Now I am looking for potential original uses of vl/QEMU !

Hmm, what are the chances of SMP?  You mentioned something about it
probing addresses you couldn't map, perhaps another job for
CONFIG_QEMU inside the kernel, or is it too invasive?

Even with only one CPU, it helps my debugging to be able to test

I realize that SMP simulation can be interesting. I could at least learn how it works as I never looked at it. The simplest solution would be to use CONFIG_QEMU to change the FIXADDR_TOP address in fixmap.h (I am going to test that). I have looked at APIC and IOAPIC simulation in bochs and it does not seem so complicated. My real problem is how to simulate several CPUs at the same time. A solution is to use a single process and to schedule by hand. It is costly because the address space must be switched between each CPU. Another solution is to use separate processes, but it complicates the hardware simulation. Any ideas ?


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