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Re: [Qemu-devel] Re: [questions] savevm|loadvm
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] Re: [questions] savevm|loadvm |
Date: |
Thu, 1 Apr 2010 12:20:09 +0000 |
User-agent: |
KMail/1.12.4 (Linux/2.6.32-trunk-amd64; KDE/4.3.4; x86_64; ; ) |
> Wenhao Xu <address@hidden> wrote:
> > Hi, Juan,
> > I am fresh to both QEMU and KVM. But so far, I notice that QEMU
> > uses "KVM_SET_USER_MEMORY_REGION" to set memory region that KVM can
> > use and uses cpu_register_physical_memory_offset to register the same
> > memory to QEMU emulator, which means QEMU and KVM use the same host
> > virtual memory. And therefore the memory KVM modified could be
> > directly reflected to QEMU. I don't quite understand the different
> > memory layout problem between the two. So I don't know exactly what
> > you mean to "fix" it?
>
> 1st. qemu-kvm.git and qemu.git memory layouts are different, indeed with
> qemu.git kvm mode. (yes it is complex and weird).
>
> kvm vs qemu initialization is different. Expecting to stop kvm, and run
> tcg from there is not going to work. I guess it would need a lot of
> changes, but I haven't looked at it myself.
FWIW I think this really *should* work, and any failure to do so is definitely
a bug.
Paul