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KVM: x86/mmu: Truncate paging32's PT_BASE_ADDR_MASK to 32 bits

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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>
This commit is contained in:
Sean Christopherson 2022-06-14 23:33:27 +00:00 committed by Paolo Bonzini
parent f6b8ea6d43
commit f7384b8866
1 changed files with 1 additions and 1 deletions
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2
arch/x86/kvm/mmu/paging_tmpl.h
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@ -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