On Thu, Nov 21, 2013 at 12:39:49AM +0000, Jim MacArthur wrote:
> On 20 November 2013 17:28, Paolo Bonzini <[email protected]> wrote:
> > Il 20/11/2013 00:56, Jim MacArthur ha scritto:
> >> The question is, how does a new vcpu start up? Will it start in full
> >> 64-bit mode or 16-bit real mode?
> >
> > By default it start in 16-bit real mode, with CS=0xf000 and EIP=0xfff0,
> > but CS.base = 0xffff0000. However, you can send ioctls to modify
> > CR0/CR4/EFER and place the VCPU in whatever mode you'd like to have.
>
> After reading this I added a call to KVM_GET_SREGS. Everything you say
> here matches my experience except that CS.base=0xf0000.
> So I adjusted my memory to cover physical address 0xFFFF0, and now
> it's happily running instructions (NOPs, at least.)
> I'm a bit puzzled that it didn't start with CS.base=0xffff0000, but it
> doesn't matter, I've done what I wanted to do for now.
>
What is your kernel version?
--
Gleb.
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