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kvm: x86: mmu: allow A/D bits to be disabled in an mmu

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Adds the plumbing to disable A/D bits in the MMU based on a new role
bit, ad_disabled. When A/D is disabled, the MMU operates as though A/D
aren't available (i.e., using access tracking faults instead).

To avoid SP -> kvm_mmu_page.role.ad_disabled lookups all over the
place, A/D disablement is now stored in the SPTE. This state is stored
in the SPTE by tweaking the use of SPTE_SPECIAL_MASK for access
tracking. Rather than just setting SPTE_SPECIAL_MASK when an
access-tracking SPTE is non-present, we now always set
SPTE_SPECIAL_MASK for access-tracking SPTEs.

Signed-off-by: Peter Feiner <pfeiner@google.com>
[Use role.ad_disabled even for direct (non-shadow) EPT page tables.  Add
 documentation and a few MMU_WARN_ONs. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Peter Feiner
2017-06-30 17:26:31 -07:00
committed by Paolo Bonzini
parent dcdca5fed5
commit ac8d57e573
4 changed files with 95 additions and 33 deletions
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6
arch/x86/kvm/mmutrace.h
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@@ -30,8 +30,9 @@
\
role.word = __entry->role; \
\
trace_seq_printf(p, "sp gen %lx gfn %llx %u%s q%u%s %s%s" \
" %snxe root %u %s%c", __entry->mmu_valid_gen, \
trace_seq_printf(p, "sp gen %lx gfn %llx l%u%s q%u%s %s%s" \
" %snxe %sad root %u %s%c", \
__entry->mmu_valid_gen, \
__entry->gfn, role.level, \
role.cr4_pae ? " pae" : "", \
role.quadrant, \
@@ -39,6 +40,7 @@
access_str[role.access], \
role.invalid ? " invalid" : "", \
role.nxe ? "" : "!", \
role.ad_disabled ? "!" : "", \
__entry->root_count, \
__entry->unsync ? "unsync" : "sync", 0); \
saved_ptr; \