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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> |
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.. | ||
mmu_audit.c | ||
mmu_internal.h | ||
mmu.c | ||
mmutrace.h | ||
page_track.c | ||
paging_tmpl.h | ||
spte.c | ||
spte.h | ||
tdp_iter.c | ||
tdp_iter.h | ||
tdp_mmu.c | ||
tdp_mmu.h |