linux-kernel - [PATCH v2 2/2] KVM: Move INVPCID type check from vmx and svm to the common kvm_handle

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Message-Id: <20211103183232.1213761-3-vipinsh@google.com>
Date:   Wed,  3 Nov 2021 18:32:32 +0000
From:   Vipin Sharma <vipinsh@...gle.com>
To:     pbonzini@...hat.com, seanjc@...gle.com, jmattson@...gle.com
Cc:     dmatlack@...gle.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Vipin Sharma <vipinsh@...gle.com>
Subject: [PATCH v2 2/2] KVM: Move INVPCID type check from vmx and svm to the
 common kvm_handle_invpcid()

This check will be done in switch statement of kvm_handle_invpcid(),
used by both VMX and SVM. It also removes (type > 3) check.

Signed-off-by: Vipin Sharma <vipinsh@...gle.com>
---
 arch/x86/kvm/svm/svm.c | 5 -----
 arch/x86/kvm/vmx/vmx.c | 5 -----
 arch/x86/kvm/x86.c     | 3 ++-
 3 files changed, 2 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 21bb81710e0f..ccbf96876ec6 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3119,11 +3119,6 @@ static int invpcid_interception(struct kvm_vcpu *vcpu)
 	type = svm->vmcb->control.exit_info_2;
 	gva = svm->vmcb->control.exit_info_1;
 
-	if (type > 3) {
-		kvm_inject_gp(vcpu, 0);
-		return 1;
-	}
-
 	return kvm_handle_invpcid(vcpu, type, gva);
 }
 
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e41d207e3298..a3bb9854f4d2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -5505,11 +5505,6 @@ static int handle_invpcid(struct kvm_vcpu *vcpu)
 	gpr_index = vmx_get_instr_info_reg2(vmx_instruction_info);
 	type = kvm_register_read(vcpu, gpr_index);
 
-	if (type > 3) {
-		kvm_inject_gp(vcpu, 0);
-		return 1;
-	}
-
 	/* According to the Intel instruction reference, the memory operand
 	 * is read even if it isn't needed (e.g., for type==all)
 	 */
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ac83d873d65b..134585027e92 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12443,7 +12443,8 @@ int kvm_handle_invpcid(struct kvm_vcpu *vcpu, unsigned long type, gva_t gva)
 		return kvm_skip_emulated_instruction(vcpu);
 
 	default:
-		BUG(); /* We have already checked above that type <= 3 */
+		kvm_inject_gp(vcpu, 0);
+		return 1;
 	}
 }
 EXPORT_SYMBOL_GPL(kvm_handle_invpcid);
-- 
2.33.1.1089.g2158813163f-goog