KVM x86 MMU changes for 6.7:

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- 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.
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Merge tag 'kvm-x86-mmu-6.7' of https://github.com/kvm-x86/linux into HEAD

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.

...

This commit is contained in:

Paolo Bonzini 2023-10-31 10:17:43 -04:00

parent f292dc8aad 1de9992f9d

commit f0f59d069e

5 changed files with 55 additions and 21 deletions

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7

arch/x86/kvm/mmu.h

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37

arch/x86/kvm/mmu/mmu.c

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2

arch/x86/kvm/mtrr.c

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9

arch/x86/kvm/vmx/vmx.c

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21

arch/x86/kvm/x86.c

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