Re: [Xen-devel] [PATCH v4 5/7] xen/x86: disable global pages for domains with XPTI active

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 27.03.18 at 11:07, <jgross@xxxxxxxx> wrote:
> Instead of flushing the TLB from global pages when switching address
> spaces with XPTI being active just disable global pages via %cr4
> completely when a domain subject to XPTI is active. This avoids the
> need for extra TLB flushes as loading %cr3 will remove all TLB
> entries.
> 
> In order to avoid states with cr3/cr4 having inconsistent values
> (e.g. global pages being activated while cr3 already specifies a XPTI
> address space) move loading of the new cr4 value to write_ptbase()
> (actually to write_cr3_cr4() called by write_ptbase()).
> 
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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