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c59de14133
KVM x86 MMU changes for 6.13 - Cleanup KVM's handling of Accessed and Dirty bits to dedup code, improve documentation, harden against unexpected changes, and to simplify A/D-disabled MMUs by using the hardware-defined A/D bits to track if a PFN is Accessed and/or Dirty. - Elide TLB flushes when aging SPTEs, as has been done in x86's primary MMU for over 10 years. - Batch TLB flushes when zapping collapsible TDP MMU SPTEs, i.e. when dirty logging is toggled off, which reduces the time it takes to disable dirty logging by ~3x. - Recover huge pages in-place in the TDP MMU instead of zapping the SP and waiting until the page is re-accessed to create a huge mapping. Proactively installing huge pages can reduce vCPU jitter in extreme scenarios. - Remove support for (poorly) reclaiming page tables in shadow MMUs via the primary MMU's shrinker interface.