On Fri, Oct 27, 2023 at 10:49 PM Sean Christopherson <seanjc@xxxxxxxxxx> wrote: > > This is mostly the first half of a series by Yan to optimize KVM's handling of > guest MTRR changes for VMs with non-coherent DMA. Yan had to put more complex > changes that actually realize the optimizations on hold, but the patches here > are all nice cleanups on their own. > > The following changes since commit 5804c19b80bf625c6a9925317f845e497434d6d3: > > Merge tag 'kvm-riscv-fixes-6.6-1' of https://github.com/kvm-riscv/linux into HEAD (2023-09-23 05:35:55 -0400) Pulled, thanks. Paolo > are available in the Git repository at: > > https://github.com/kvm-x86/linux.git tags/kvm-x86-mmu-6.7 > > for you to fetch changes up to 1de9992f9de0a92b6e11133aba0e2be833c11084: > > KVM: x86/mmu: Remove unnecessary ‘NULL’ values from sptep (2023-10-18 14:34:28 -0700) > > ---------------------------------------------------------------- > KVM x86 MMU changes for 6.7: > > - Clean up code that deals with honoring guest MTRRs when the VM has > non-coherent DMA and host MTRRs are ignored, i.e. EPT is enabled. > > - Zap EPT entries when non-coherent DMA assignment stops/start to prevent > using stale entries with the wrong memtype. > > - Don't ignore guest PAT for CR0.CD=1 && KVM_X86_QUIRK_CD_NW_CLEARED=y, as > there's zero reason to ignore guest PAT if the effective MTRR memtype is WB. > This will also allow for future optimizations of handling guest MTRR updates > for VMs with non-coherent DMA and the quirk enabled. > > - Harden the fast page fault path to guard against encountering an invalid > root when walking SPTEs. > > ---------------------------------------------------------------- > Li zeming (1): > KVM: x86/mmu: Remove unnecessary ‘NULL’ values from sptep > > Yan Zhao (5): > KVM: x86/mmu: Add helpers to return if KVM honors guest MTRRs > KVM: x86/mmu: Zap SPTEs when CR0.CD is toggled iff guest MTRRs are honored > KVM: x86/mmu: Zap SPTEs on MTRR update iff guest MTRRs are honored > KVM: x86/mmu: Zap KVM TDP when noncoherent DMA assignment starts/stops > KVM: VMX: drop IPAT in memtype when CD=1 for KVM_X86_QUIRK_CD_NW_CLEARED > > arch/x86/kvm/mmu.h | 7 +++++++ > arch/x86/kvm/mmu/mmu.c | 37 ++++++++++++++++++++++++++----------- > arch/x86/kvm/mtrr.c | 2 +- > arch/x86/kvm/vmx/vmx.c | 9 +++------ > arch/x86/kvm/x86.c | 21 ++++++++++++++++++--- > 5 files changed, 55 insertions(+), 21 deletions(-) >
