Re: [PATCH] kvm-12 userland guest reboot fix

Joerg Roedel
2007-01-24T14:39:02Z

On Wed, Jan 24, 2007 at 03:47:58PM +0200, Avi Kivity wrote:
> Joerg Roedel wrote:
> >From: Markus Rechberger <markus.rechberger-5C7GfCeVMHo@public.gmane.org>
> >From: Joerg Roedel <joerg.roedel-5C7GfCeVMHo@public.gmane.org>
> >
> >This patch fixes the initialization of the segment registers which
> >solves the triple fault and keyboard controller reset problems in
> >kvm/qemu guests as well as the slow grub menu interaction. This works
> >for SVM now, it is not tested on kvm/vmx.
> >
> >
>
> The patch fails to boot on Intel hosts. Most likely the segment
> changes are illegal for vm86 mode, which we use on Intel to simulate
> real mode.
>
> I tried to change flags in cpu_reset() so that type == 3 and dpl == 3,
> as required by 22.3.1.2, but it didn't help.

Hmm, I am not aware of the VMX and realmode emulation implementation. Is
it hard to simply hide those flags to the vm86 mode?

--
Joerg Roedel
Operating System Research Center
AMD Saxony LLC & Co. KG