linux-kernel - [PATCH 04/12] KVM: x86: Add a helper to handle legal GPA with an alignment requirement

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Date:   Wed,  3 Feb 2021 16:01:09 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>,
        Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: [PATCH 04/12] KVM: x86: Add a helper to handle legal GPA with an
 alignment requirement

Add a helper to genericize checking for a legal GPA that also must
conform to an arbitrary alignment, and use it in the existing
page_address_valid().  Future patches will replace open coded variants
in VMX and SVM.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/cpuid.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index 674d61079f2d..a9d55ab51e3c 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -46,9 +46,15 @@ static inline bool kvm_vcpu_is_illegal_gpa(struct kvm_vcpu *vcpu, gpa_t gpa)
 	return !kvm_vcpu_is_legal_gpa(vcpu, gpa);
 }
 
+static inline bool kvm_vcpu_is_legal_aligned_gpa(struct kvm_vcpu *vcpu,
+						 gpa_t gpa, gpa_t alignment)
+{
+	return IS_ALIGNED(gpa, alignment) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
+}
+
 static inline bool page_address_valid(struct kvm_vcpu *vcpu, gpa_t gpa)
 {
-	return PAGE_ALIGNED(gpa) && kvm_vcpu_is_legal_gpa(vcpu, gpa);
+	return kvm_vcpu_is_legal_aligned_gpa(vcpu, gpa, PAGE_SIZE);
 }
 
 struct cpuid_reg {
-- 
2.30.0.365.g02bc693789-goog