KVM x86 MMU changes for 6.4:

- Tweak FNAME(sync_spte) to avoid unnecessary writes+flushes when the guest is only adding new PTEs - Overhaul .sync_page() and .invlpg() to share the .sync_page() implementation, i.e. utilize .sync_page()'s optimizations when emulating invalidations - Clean up the range-based flushing APIs - Revamp the TDP MMU's reaping of Accessed/Dirty bits to clear a single A/D bit using a LOCK AND instead of XCHG, and skip all of the "handle changed SPTE" overhead associated with writing the entire entry - Track the number of "tail" entries in a pte_list_desc to avoid having to walk (potentially) all descriptors during insertion and deletion, which gets quite expensive if the guest is spamming fork() - Misc cleanups -----BEGIN PGP SIGNATURE----- iQJGBAABCgAwFiEEMHr+pfEFOIzK+KY1YJEiAU0MEvkFAmRGsvASHHNlYW5qY0Bn b29nbGUuY29tAAoJEGCRIgFNDBL5XnoP/0D8rQmrA0xPHK81zYS1E71tsR/itO/T CQMSB4PhEqvcRUaWOuhLBRUW+noWzaOkjkMYK2uoPTdtme7v9+Ar7EtfrWYHrBWD IxHCAymo3a5dQPUc3Nb77u6HjRAOokPSqSz5jE4qAjlniW09feruro2Phi+BTme4 JjxTc/7Oh0Fu26+mK7mJHiw3fV1x3YznnnRPrKGrVQes5L6ozNICkUZ6nvuJUVMk lTNHNQbG8PqJZnfWG7VIKRn1vdfXwEfnvyucGVEqFfPLkOXqJHyqMVmIOtvsH7C5 l8j36+lBZwtFh2jk2EsXOTb6sS7l1MSvyHLlbaJaqqffP+77Hf1n0fROur0k9Yse jJJejJWxZ/SvjMt/bOA+4ybGafZH0lt20DsDWnat5GSQ1EVT1CInN2p8OY8pdecR QOJBqnNUOykC7/Pyad+IxTxwrOSNCYh+5aYG8AdGquZvNUEwjffVJqrmxDvklY8Z DTYwGKgNY7NsP/dV0WYYElsAuHiKwiDZL15KftiQebO1fPcZDpTzDo83/8UMfGxh yegngcNX9Qi7lWtLkUMy8A99UvejM0QrS/Zt8v1zjlQ8PjreZLLBWsNpe0ufIMRk 31ZAC2OS4Koi3wZ54tA7Z1Kh11meGhAk5Ti7sNke0rDqB9UMmj6UKw121cSRvW7q W6O4U3YeGpKx =zb4u -----END PGP SIGNATURE----- Merge tag 'kvm-x86-mmu-6.4' of https://github.com/kvm-x86/linux into HEAD KVM x86 MMU changes for 6.4: - Tweak FNAME(sync_spte) to avoid unnecessary writes+flushes when the guest is only adding new PTEs - Overhaul .sync_page() and .invlpg() to share the .sync_page() implementation, i.e. utilize .sync_page()'s optimizations when emulating invalidations - Clean up the range-based flushing APIs - Revamp the TDP MMU's reaping of Accessed/Dirty bits to clear a single A/D bit using a LOCK AND instead of XCHG, and skip all of the "handle changed SPTE" overhead associated with writing the entire entry - Track the number of "tail" entries in a pte_list_desc to avoid having to walk (potentially) all descriptors during insertion and deletion, which gets quite expensive if the guest is spamming fork() - Misc cleanups
2026-10-16 22:39:48 +00:00 · 2023-04-26 15:50:01 -04:00 · 2023-04-26 15:50:01 -04:00 · 807b758496
commit 807b758496
parent a1c288f87d 9ed3bf4112
14 changed files with 515 additions and 567 deletions
--- a/arch/x86/include/asm/kvm-x86-ops.h
+++ b/arch/x86/include/asm/kvm-x86-ops.h
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
--- a/arch/x86/kvm/kvm_onhyperv.c
+++ b/arch/x86/kvm/kvm_onhyperv.c
--- a/arch/x86/kvm/kvm_onhyperv.h
+++ b/arch/x86/kvm/kvm_onhyperv.h
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
--- a/arch/x86/kvm/mmu/mmu_internal.h
+++ b/arch/x86/kvm/mmu/mmu_internal.h
--- a/arch/x86/kvm/mmu/paging_tmpl.h
+++ b/arch/x86/kvm/mmu/paging_tmpl.h
--- a/arch/x86/kvm/mmu/spte.c
+++ b/arch/x86/kvm/mmu/spte.c
--- a/arch/x86/kvm/mmu/tdp_iter.h
+++ b/arch/x86/kvm/mmu/tdp_iter.h
--- a/arch/x86/kvm/mmu/tdp_mmu.c
+++ b/arch/x86/kvm/mmu/tdp_mmu.c
--- a/arch/x86/kvm/svm/svm_onhyperv.h
+++ b/arch/x86/kvm/svm/svm_onhyperv.h
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c