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the PG_G global pte flag, pmap_invalidate_all() fails to flush global TLB entries [*]. This is because TLB shootdown handler for such configs reloads CR3, and on i386 pmap_invalidate_all() does the same for the initiating CPU. Note that current code does not issue total invalidation requests for the kernel_pmap. Rename amd64 function invltlb_globpcid() to invltlb_glob(), it is not specific for PCID for quite some time, and implement the same functionality for i386. Use the function instead of invltlb() in shootdown handlers and in i386 pmap_invalidate_all(), but only for the kernel pmap (which maps pages with the PG_G attribute set), which takes care of PG_G TLB entries on flush. To detect the affected pmap in i386 TLB shootdown handler, pmap should be passed to the smp_masked_invltlb() function, which makes amd64 and i386 TLB shootdown code almost identical. Merge the code under x86/. Noted by: jhb [*] Reviewed by: cem, jhb, pho Tested by: pho Sponsored by: The FreeBSD Foundation Differential revision: https://reviews.freebsd.org/D4346
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