Re: [Xen-devel] [PATCH] x86: suppress sync when XPTI is disabled for a domain

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.05.18 at 16:24, <JBeulich@xxxxxxxx> wrote:
> Now that we have a per-domain flag we can and should control sync-ing in
> a more fine grained manner: Only domains having XPTI enabled need the
> sync to occur.
> 
> Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> --- a/xen/arch/x86/mm.c
> +++ b/xen/arch/x86/mm.c
> @@ -3765,7 +3765,7 @@
>                          break;
>                      rc = mod_l4_entry(va, l4e_from_intpte(req.val), mfn,
>                                        cmd == MMU_PT_UPDATE_PRESERVE_AD, v);
> -                    if ( !rc && !cpu_has_no_xpti )
> +                    if ( !rc && v->domain->arch.pv_domain.xpti )

I've meanwhile realized that instead of v->domain this would better be
pt_dom - I take it that this doesn't invalidate your R-b.

Jan



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