linux-kernel - [PATCH v5 24/36] KVM: arm64: Refactor __populate_fault

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Message-Id: <20210315143536.214621-25-qperret@google.com>
Date:   Mon, 15 Mar 2021 14:35:24 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     catalin.marinas@....com, will@...nel.org, maz@...nel.org,
        james.morse@....com, julien.thierry.kdev@...il.com,
        suzuki.poulose@....com
Cc:     android-kvm@...gle.com, seanjc@...gle.com, mate.toth-pal@....com,
        linux-kernel@...r.kernel.org, robh+dt@...nel.org,
        linux-arm-kernel@...ts.infradead.org, kernel-team@...roid.com,
        kvmarm@...ts.cs.columbia.edu, tabba@...gle.com, ardb@...nel.org,
        mark.rutland@....com, dbrazdil@...gle.com, qperret@...gle.com
Subject: [PATCH v5 24/36] KVM: arm64: Refactor __populate_fault_info()

Refactor __populate_fault_info() to introduce __get_fault_info() which
will be used once the host is wrapped in a stage 2.

Acked-by: Will Deacon <will@...nel.org>
Signed-off-by: Quentin Perret <qperret@...gle.com>
---
 arch/arm64/kvm/hyp/include/hyp/switch.h | 34 +++++++++++++------------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/arch/arm64/kvm/hyp/include/hyp/switch.h b/arch/arm64/kvm/hyp/include/hyp/switch.h
index 6c1f51f25eb3..40c274da5a7c 100644
--- a/arch/arm64/kvm/hyp/include/hyp/switch.h
+++ b/arch/arm64/kvm/hyp/include/hyp/switch.h
@@ -160,19 +160,9 @@ static inline bool __translate_far_to_hpfar(u64 far, u64 *hpfar)
 	return true;
 }
 
-static inline bool __populate_fault_info(struct kvm_vcpu *vcpu)
+static inline bool __get_fault_info(u64 esr, struct kvm_vcpu_fault_info *fault)
 {
-	u8 ec;
-	u64 esr;
-	u64 hpfar, far;
-
-	esr = vcpu->arch.fault.esr_el2;
-	ec = ESR_ELx_EC(esr);
-
-	if (ec != ESR_ELx_EC_DABT_LOW && ec != ESR_ELx_EC_IABT_LOW)
-		return true;
-
-	far = read_sysreg_el2(SYS_FAR);
+	fault->far_el2 = read_sysreg_el2(SYS_FAR);
 
 	/*
 	 * The HPFAR can be invalid if the stage 2 fault did not
@@ -188,17 +178,29 @@ static inline bool __populate_fault_info(struct kvm_vcpu *vcpu)
 	if (!(esr & ESR_ELx_S1PTW) &&
 	    (cpus_have_final_cap(ARM64_WORKAROUND_834220) ||
 	     (esr & ESR_ELx_FSC_TYPE) == FSC_PERM)) {
-		if (!__translate_far_to_hpfar(far, &hpfar))
+		if (!__translate_far_to_hpfar(fault->far_el2, &fault->hpfar_el2))
 			return false;
 	} else {
-		hpfar = read_sysreg(hpfar_el2);
+		fault->hpfar_el2 = read_sysreg(hpfar_el2);
 	}
 
-	vcpu->arch.fault.far_el2 = far;
-	vcpu->arch.fault.hpfar_el2 = hpfar;
 	return true;
 }
 
+static inline bool __populate_fault_info(struct kvm_vcpu *vcpu)
+{
+	u8 ec;
+	u64 esr;
+
+	esr = vcpu->arch.fault.esr_el2;
+	ec = ESR_ELx_EC(esr);
+
+	if (ec != ESR_ELx_EC_DABT_LOW && ec != ESR_ELx_EC_IABT_LOW)
+		return true;
+
+	return __get_fault_info(esr, &vcpu->arch.fault);
+}
+
 /* Check for an FPSIMD/SVE trap and handle as appropriate */
 static inline bool __hyp_handle_fpsimd(struct kvm_vcpu *vcpu)
 {
-- 
2.31.0.rc2.261.g7f71774620-goog