linux-kernel - [PATCH 1/7] KVM: SVM: move map argument out of enter_svm_guest

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Date:   Fri, 15 May 2020 13:41:38 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     Cathy Avery <cavery@...hat.com>,
        Liran Alon <liran.alon@...cle.com>,
        Jim Mattson <jmattson@...gle.com>
Subject: [PATCH 1/7] KVM: SVM: move map argument out of enter_svm_guest_mode

Unmapping the nested VMCB in enter_svm_guest_mode is a bit of a wart,
since the map is not used elsewhere in the function.  There are
just two calls, so move it there.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/svm/nested.c | 14 ++++++--------
 arch/x86/kvm/svm/svm.c    |  3 ++-
 arch/x86/kvm/svm/svm.h    |  2 +-
 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index a89a166d1cb8..22f75f66084f 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -226,7 +226,7 @@ static bool nested_vmcb_checks(struct vmcb *vmcb)
 }
 
 void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
-			  struct vmcb *nested_vmcb, struct kvm_host_map *map)
+			  struct vmcb *nested_vmcb)
 {
 	bool evaluate_pending_interrupts =
 		is_intercept(svm, INTERCEPT_VINTR) ||
@@ -305,8 +305,6 @@ void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
 	svm->vmcb->control.pause_filter_thresh =
 		nested_vmcb->control.pause_filter_thresh;
 
-	kvm_vcpu_unmap(&svm->vcpu, map, true);
-
 	/* Enter Guest-Mode */
 	enter_guest_mode(&svm->vcpu);
 
@@ -369,10 +367,7 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
 		nested_vmcb->control.exit_code_hi = 0;
 		nested_vmcb->control.exit_info_1  = 0;
 		nested_vmcb->control.exit_info_2  = 0;
-
-		kvm_vcpu_unmap(&svm->vcpu, &map, true);
-
-		return ret;
+		goto out;
 	}
 
 	trace_kvm_nested_vmrun(svm->vmcb->save.rip, vmcb_gpa,
@@ -415,7 +410,7 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
 	copy_vmcb_control_area(hsave, vmcb);
 
 	svm->nested.nested_run_pending = 1;
-	enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb, &map);
+	enter_svm_guest_mode(svm, vmcb_gpa, nested_vmcb);
 
 	if (!nested_svm_vmrun_msrpm(svm)) {
 		svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
@@ -426,6 +421,9 @@ int nested_svm_vmrun(struct vcpu_svm *svm)
 		nested_svm_vmexit(svm);
 	}
 
+out:
+	kvm_vcpu_unmap(&svm->vcpu, &map, true);
+
 	return ret;
 }
 
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 4e9cd2a73ad0..dc12a03d16f6 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3843,7 +3843,8 @@ static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, const char *smstate)
 		if (kvm_vcpu_map(&svm->vcpu, gpa_to_gfn(vmcb), &map) == -EINVAL)
 			return 1;
 		nested_vmcb = map.hva;
-		enter_svm_guest_mode(svm, vmcb, nested_vmcb, &map);
+		enter_svm_guest_mode(svm, vmcb, nested_vmcb);
+		kvm_vcpu_unmap(&svm->vcpu, &map, true);
 	}
 	return 0;
 }
diff --git a/arch/x86/kvm/svm/svm.h b/arch/x86/kvm/svm/svm.h
index 5cc559ab862d..730eb7242930 100644
--- a/arch/x86/kvm/svm/svm.h
+++ b/arch/x86/kvm/svm/svm.h
@@ -397,7 +397,7 @@ static inline bool nested_exit_on_nmi(struct vcpu_svm *svm)
 }
 
 void enter_svm_guest_mode(struct vcpu_svm *svm, u64 vmcb_gpa,
-			  struct vmcb *nested_vmcb, struct kvm_host_map *map);
+			  struct vmcb *nested_vmcb);
 int nested_svm_vmrun(struct vcpu_svm *svm);
 void nested_svm_vmloadsave(struct vmcb *from_vmcb, struct vmcb *to_vmcb);
 int nested_svm_vmexit(struct vcpu_svm *svm);
-- 
2.18.2