qemu-devel
[Top][All Lists]
Advanced

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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


From: Anthony Liguori
Subject: Re: AW: Re: [Qemu-devel] VMport patch
Date: Sun, 20 Jan 2008 20:41:09 -0600
User-agent: Thunderbird 2.0.0.6 (X11/20071022)

Mark Williamson 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.

Maybe have a commandline flag, and have it switched off by default? Or, even better, would be to detect valid vmware tools behaviour and switch it on iff that happened; the default being to behave normally for OSes that aren't running the VMware tools..

There is no way to know for sure that it's vm-tools running. You would have to make use of the cpu option to support it I reckon.

Regards,

Anthony Liguori

Cheers,
Mark

Regards,

Anthony Liguori

Regards,

Alex

----- 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:
Hello,

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.

Regards,

Anthony Liguori

Best regards,
Filip Navara








reply via email to

[Prev in Thread] Current Thread [Next in Thread]