Eager page splitting cleanups for a few minor things that were noted in code review but didn't make it into the committed code. Patch 1 goes beyond the eager page splitting series, but it's still very much relevant. The last patch in particular is a bit more urgent than I first realized. I had forgotten that pte_list_desc is now 128 bytes, and I also had a brain fart and thought it was just allocating pointers, i.e. 8 bytes. In other words, I was thinking the 513 object buffer was "only" wasting ~8kb per VM, whereas it actually costs ~64kb per VM. v2: - Add helper to compute SPTE's index into its parent. [David]. - Collect reviews [David]. - Tweak the comment in the last patch after more analysis. v1: - https://lore.kernel.org/all/20220624171808.2845941-1-seanjc@xxxxxxxxxx Sean Christopherson (4): KVM: x86/mmu: Add optimized helper to retrieve an SPTE's index KVM: x86/mmu: Expand quadrant comment for PG_LEVEL_4K shadow pages KVM: x86/mmu: Use "unsigned int", not "u32", for SPTEs' @access info KVM: x86/mmu: Buffer nested MMU split_desc_cache only by default capacity arch/x86/kvm/mmu/mmu.c | 74 +++++++++++++++++++++------------- arch/x86/kvm/mmu/paging_tmpl.h | 4 +- arch/x86/kvm/mmu/spte.h | 6 +++ 3 files changed, 53 insertions(+), 31 deletions(-) base-commit: 4b88b1a518b337de1252b8180519ca4c00015c9e -- 2.37.0.rc0.161.g10f37bed90-goog
