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Re: AW: Re: [Qemu-devel] VMport patch

From: Anthony Liguori
Subject: Re: AW: Re: [Qemu-devel] VMport patch
Date: Sun, 20 Jan 2008 17:09:42 -0600
User-agent: Thunderbird (X11/20071022)

Alexander Graf wrote:
I think it would be great to maintain compatibility with the binary-only 
versions of the vm tools though.

But you're changing the semantics of the x86 instruction set. You potentially break a real operating system. It also eliminates the possibility of nesting with something like kqemu because you can't trap all PIO operations.


Anthony Liguori



----- Urspr√ľngliche Nachricht -----
Von: Anthony Liguori <address@hidden>
Gesendet: Sonntag, 20. Januar 2008 22:40
An: address@hidden
Betreff: Re: [Qemu-devel] VMport patch

Filip Navara wrote:

the current version of QEMU emulates the VMware backdoor I/O port and it works quite well. Unfortunately it doesn't emulate the VMware behavior of ignoring the I/O permissions when accessing this special port. The attached patch corrects it. It's important to ignore the permissions, so that user mode VMware tools can communicate to the backdoor. =

I really dislike that VMware relies on this. It's very hard to implement in kqemu or KVM. I think it would be better to modify open-vm-tools than to modify QEMU.


Anthony Liguori

Best regards,
Filip Navara

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