Nakajima, Jun wrote:
And actually you don't need the write to CR3 to flush TLB because the
one to CR4 does it. Or does kvm_flush_tlb_kernel assume that CR3 is
updated at the same time?
Jun
It should not be necessary, but I believe this was added as a workaround
to a PII erratum. I can't find the erratum, however, and the history of
using G bits in Linux is complicated (several bugs introduced and many
intermediate versions of this code). Since this is not performance
critical, I think it is probably best to leave the CR3 reload.
However, being unnecessary on modern processors, I already submitted a
patch to eliminate it on 64-bit (or maybe just told Andi about it, I
can't recall).
Zach
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