Re: [Xen-devel] [PATCH v8 11/17] x86: Protect unaware domains from meddling hyperthreads

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 16.01.18 at 22:11, <andrew.cooper3@xxxxxxxxxx> wrote:
> An alternative to the current levelling logic would be to treat STIBP as
> a Special Bit (in CPUID terms, like OSXSAVE/etc) and unconditionally set
> it equal to IBRS, irrespective of the toolstack setting.  That way,
> migration between HT and non-HT hardware is safe and a VM which chooses
> to use STIBP will work even on non-HT hardware which simply ignores the
> request.

Wouldn't that overall result in simpler code anyway?

Jan


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