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| author | Sean Christopherson <seanjc@google.com> | 2022-06-15 02:33:27 +0300 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2022-06-20 13:21:29 +0300 |
| commit | f7384b8866b0b07f249130aa8b63135687626c5c (patch) | |
| tree | 96e7168a2f9df8bd8e5214e025749fb06d077f60 /arch/x86/kvm/mmu/paging_tmpl.h | |
| parent | f6b8ea6d43640ebfd1aeaa1faf1016d0bff7b8a0 (diff) | |
| download | linux-f7384b8866b0b07f249130aa8b63135687626c5c.tar.xz | |
KVM: x86/mmu: Truncate paging32's PT_BASE_ADDR_MASK to 32 bits
Truncate paging32's PT_BASE_ADDR_MASK to a pt_element_t, i.e. to 32 bits.
Ignoring PSE huge pages, the mask is only used in conjunction with gPTEs,
which are 32 bits, and so the address is limited to bits 31:12.
PSE huge pages encoded PA bits 39:32 in PTE bits 20:13, i.e. need custom
logic to handle their funky encoding regardless of PT_BASE_ADDR_MASK.
Note, PT_LVL_OFFSET_MASK is somewhat confusing in that it computes the
offset of the _gfn_, not of the gpa, i.e. not having bits 63:32 set in
PT_BASE_ADDR_MASK is again correct.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20220614233328.3896033-8-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu/paging_tmpl.h')
| -rw-r--r-- | arch/x86/kvm/mmu/paging_tmpl.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu/paging_tmpl.h b/arch/x86/kvm/mmu/paging_tmpl.h index 61b328b0f2dc..b7424d63c706 100644 --- a/arch/x86/kvm/mmu/paging_tmpl.h +++ b/arch/x86/kvm/mmu/paging_tmpl.h @@ -39,7 +39,7 @@ #define pt_element_t u32 #define guest_walker guest_walker32 #define FNAME(name) paging##32_##name - #define PT_BASE_ADDR_MASK PAGE_MASK + #define PT_BASE_ADDR_MASK ((pt_element_t)PAGE_MASK) #define PT_LEVEL_BITS 10 #define PT_MAX_FULL_LEVELS 2 #define PT_GUEST_DIRTY_SHIFT PT_DIRTY_SHIFT |