Re: [Xen-devel] [PATCH v9 09/11] x86/ctxt: Issue a speculation barrier between vcpu contexts

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 20.01.18 at 12:10, <dwmw2@xxxxxxxxxxxxx> wrote:
> On Fri, 2018-01-19 at 08:07 -0700, Jan Beulich wrote:
>> I understand that, but there was no explanation whatsoever as
>> to why that is.
> 
> Looks like we set per_cpu(curr_vcpu)=next every time we switch, even if
> we are switching to the idle domain.

I can't see that - the only place it is being updated is at the end of
__context_switch(), which isn't being called in the normal case
when context_switch() finds is_idle_domain(nextd).

Jan


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