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KVM: x86: masking out upper bits
kvm_read_cr3() returns an unsigned long and gfn is a u64. We intended to mask out the bottom 5 bits but because of the type issue we mask the top 32 bits as well. I don't know if this is a real problem, but it causes static checker warnings. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
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1 changed files with 2 additions and 2 deletions
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@ -597,8 +597,8 @@ bool pdptrs_changed(struct kvm_vcpu *vcpu)
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(unsigned long *)&vcpu->arch.regs_avail))
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return true;
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gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
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offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
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gfn = (kvm_read_cr3(vcpu) & ~31ul) >> PAGE_SHIFT;
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offset = (kvm_read_cr3(vcpu) & ~31ul) & (PAGE_SIZE - 1);
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r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
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PFERR_USER_MASK | PFERR_WRITE_MASK);
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if (r < 0)
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