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| author |   Sean Christopherson <seanjc@google.com> | 2021-01-22 16:30:03 -0800 |
|---|---|---|
| committer |   Paolo Bonzini <pbonzini@redhat.com> | 2021-02-04 05:27:15 -0500 |
| commit | 15e6a7e5324cc04a67891fc369ea834bbb7e7b42 (patch) | |
| tree | 06609dc07dfc5b29e162618929fa809f011e83ae /arch/x86/kvm/mmu.h | |
| parent | KVM: X86: use vzalloc() instead of vmalloc/memset (diff) | |
| download | linux-dev-15e6a7e5324cc04a67891fc369ea834bbb7e7b42.tar.xz linux-dev-15e6a7e5324cc04a67891fc369ea834bbb7e7b42.zip | |
KVM: x86/mmu: Use boolean returns for (S)PTE accessors
Return a 'bool' instead of an 'int' for various PTE accessors that are
boolean in nature, e.g. is_shadow_present_pte(). Returning an int is
goofy and potentially dangerous, e.g. if a flag being checked is moved
into the upper 32 bits of a SPTE, then the compiler may silently squash
the entire check since casting to an int is guaranteed to yield a
return value of '0'.
Opportunistically refactor is_last_spte() so that it naturally returns
a bool value instead of letting it implicitly cast 0/1 to false/true.
No functional change intended.
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210123003003.3137525-1-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/mmu.h')
| -rw-r--r-- | arch/x86/kvm/mmu.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 261be1d2032b..2bb42eee5d5d 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -152,7 +152,7 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, * * TODO: introduce APIs to split these two cases. */ -static inline int is_writable_pte(unsigned long pte) +static inline bool is_writable_pte(unsigned long pte) { return pte & PT_WRITABLE_MASK; } |