Re: [Xen-devel] [PATCH for-next 2/2] xen/x86: Drop sync_core()

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 19.05.17 at 20:49, <andrew.cooper3@xxxxxxxxxx> wrote:
> As identified in Linux c/s c198b121b1a1d "x86/asm: Rewrite sync_core() to use
> IRET-to-self", sync_core() is only appropriate for two very specific usecases.
> 
> Xen doesn't have need of either of these usecases, so drop sync_core() to
> avoid any misuse.
> 
> In the unlikely event that we do gain a legitimate use for sync_core(), it
> should be reintroduced as a mov to %cr2 rather than cpuid, which has a lower
> overhead.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Acked-by: Jan Beulich <jbeulich@xxxxxxxx>



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