Re: [PATCH 08/31] nVMX: Fix local_vcpus_link handling

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On Tue, May 17, 2011 at 09:11:32PM +0300, Nadav Har'El wrote:
> On Tue, May 17, 2011, Avi Kivity wrote about "Re: [PATCH 08/31] nVMX: Fix local_vcpus_link handling":
> > >VMCSs.  If we had only a list of VMCSs, how can we mark the vcpus as being 
> > >not
> > >currently loaded (cpu=-1)?
> > >
> > 
> > ->launched and ->cpu simply move into struct vmcs.
> 
> As I explained in the sister thread (this discussion is becoming a tree ;-))
> this is what I planned to do, until it dawned on me that I can't, because "cpu"
> isn't part of vmx (where the vmcs and launched sit in the standard KVM), but
> rather part of vcpu... When I gave up trying to "solve" these interdependencies
> and avoiding modifying half of KVM, I came up with the current solution.
> 
> Maybe I'm missing something - I'd be happy if we do find a solution that
> simplifies this code.

vcpu->cpu remains there. There is a new ->cpu field on struct vmcs, just
as saved_vmcs has in the current patches, to note the cpu which the VMCS 
was last loaded.

As mentioned there is no need to set "vcpu->cpu = -1" in __vcpu_clear,
the IPI handler, that can be done in vcpu_clear.

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