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Juergen Gross
d543fa4093
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 switch_cr3_cr4() called by write_ptbase()). This requires to use switch_cr3_cr4() instead of write_ptbase() when building dom0 in order to avoid setting cr4 with cr4.smap set. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Jan Beulich <jbeulich@suse.com>