[PATCH v3 22/32] KVM: arm64: Refactor __populate_fault_info()

Quentin Perret
2021-03-03T21:51:17Z

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

Signed-off-by: Quentin Perret <qperret@google.com>
---
arch/arm64/kvm/hyp/include/hyp/switch.h | 37 ++++++++++++++-----------
1 file changed, 21 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..1f017c9851bb 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
@@ -188,14 +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;
+
+ if (!__get_fault_info(esr, &vcpu->arch.fault))
+ return false;
+
return true;
}