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linux/arch/x86/kvm/mmu
Sean Christopherson 613a3f3797 KVM: x86/mmu: Use high bits for host/mmu writable masks for EPT SPTEs
Use bits 57 and 58 for HOST_WRITABLE and MMU_WRITABLE when using EPT.
This will allow using bit 11 as a constant MMU_PRESENT, which is
desirable as checking for a shadow-present SPTE is one of the most
common SPTE operations in KVM, particular in hot paths such as page
faults.

EPT is short on low available bits; currently only bit 11 is the only
always-available bit.  Bit 10 is also available, but only while KVM
doesn't support mode-based execution.  On the other hand, PAE paging
doesn't have _any_ high available bits.  Thus, using bit 11 is the only
feasible option for MMU_PRESENT.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210225204749.1512652-20-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2021-03-15 04:43:50 -04:00
..
mmu_audit.c KVM: Stop using deprecated jump label APIs 2021-02-04 05:27:29 -05:00
mmu_internal.h KVM: x86/mmu: Set SPTE_AD_WRPROT_ONLY_MASK if and only if PML is enabled 2021-02-26 04:43:29 -05:00
mmu.c KVM: x86/mmu: Make Host-writable and MMU-writable bit locations dynamic 2021-03-15 04:43:49 -04:00
mmutrace.h kvm: x86/mmu: Add TDP MMU SPTE changed trace point 2020-11-19 10:57:16 -05:00
page_track.c KVM: x86/mmu: Use an rwlock for the x86 MMU 2021-02-04 05:27:43 -05:00
paging_tmpl.h KVM: x86/mmu: Make Host-writable and MMU-writable bit locations dynamic 2021-03-15 04:43:49 -04:00
spte.c KVM: x86/mmu: Use high bits for host/mmu writable masks for EPT SPTEs 2021-03-15 04:43:50 -04:00
spte.h KVM: x86/mmu: Use high bits for host/mmu writable masks for EPT SPTEs 2021-03-15 04:43:50 -04:00
tdp_iter.c KVM: x86/mmu: Protect TDP MMU page table memory with RCU 2021-02-04 05:27:42 -05:00
tdp_iter.h KVM: x86/mmu: Protect TDP MMU page table memory with RCU 2021-02-04 05:27:42 -05:00
tdp_mmu.c KVM: x86/mmu: Make Host-writable and MMU-writable bit locations dynamic 2021-03-15 04:43:49 -04:00
tdp_mmu.h KVM: x86/mmu: Don't set dirty bits when disabling dirty logging w/ PML 2021-02-19 03:08:35 -05:00