x86/svm: Use flush-by-asid when available

x86/svm: Use flush-by-asid when available

AMD Fam15h processors introduced the flush-by-asid feature, for more fine
grain flushing purposes.

Flushing everything including ASID 0 (i.e. Xen context) is an an unnecesserily
large hammer, and never necessary in the context of guest TLBs needing
invalidating.

When available, use TLB_CTRL_FLUSH_ASID in preference to TLB_CTRL_FLUSH_ALL.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
Reviewed-by: Roger Pau Monné <roger.pau@citrix.com>
Reviewed-by: Jan Beulich <jbeulich@suse.com>