KVM: x86/mmu: free up bit 10 of PTEs in preparation for MBEC

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Update SPTE_MMIO_ALLOWED_MASK to allow EPT user executable (bit 10) to
be treated like EPT RWX bit2:0, as when mode-based execute control is
enabled, bit 10 can act like a "present" bit.  Likewise do not include
it in FROZEN_SPTE.

No functional changes intended, other than the reduction of the maximum
MMIO generation that is stored in page tables.

Cc: Kai Huang <kai.huang@intel.com>
Signed-off-by: Jon Kohler <jon@nutanix.com>
Message-ID: <20251223054806.1611168-4-jon@nutanix.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Tested-by: David Riley <d.riley@proxmox.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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Jon Kohler 2026-04-08 11:41:53 -04:00 • committed by Paolo Bonzini

parent 2f4d934df0

commit 9a67ab7402

2 changed files with 13 additions and 9 deletions

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2

arch/x86/include/asm/vmx.h

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20

arch/x86/kvm/mmu/spte.h

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