[PATCH 07/21] arm64: KVM: Implement 32bit system register save/restore

[Marc Zyngier <marc.zyngier@xxxxxxx>]

Implement the 32bit system register save restore as a direct
translation of the assembly code version.

Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
 arch/arm64/kvm/hyp/hyp.h       |  2 ++
 arch/arm64/kvm/hyp/sysreg-sr.c | 41 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/arch/arm64/kvm/hyp/hyp.h b/arch/arm64/kvm/hyp/hyp.h
index 087d3a5..4639330 100644
--- a/arch/arm64/kvm/hyp/hyp.h
+++ b/arch/arm64/kvm/hyp/hyp.h
@@ -38,6 +38,8 @@ void __timer_restore_state(struct kvm_vcpu *vcpu);
 
 void __sysreg_save_state(struct kvm_cpu_context *ctxt);
 void __sysreg_restore_state(struct kvm_cpu_context *ctxt);
+void __sysreg32_save_state(struct kvm_vcpu *vcpu);
+void __sysreg32_restore_state(struct kvm_vcpu *vcpu);
 
 #endif /* __ARM64_KVM_HYP_H__ */
 
diff --git a/arch/arm64/kvm/hyp/sysreg-sr.c b/arch/arm64/kvm/hyp/sysreg-sr.c
index add8fcb..3f81a4d 100644
--- a/arch/arm64/kvm/hyp/sysreg-sr.c
+++ b/arch/arm64/kvm/hyp/sysreg-sr.c
@@ -88,3 +88,44 @@ void __hyp_text __sysreg_restore_state(struct kvm_cpu_context *ctxt)
 	write_sysreg(ctxt->gp_regs.elr_el1,	elr_el1);
 	write_sysreg(ctxt->gp_regs.spsr[KVM_SPSR_EL1], spsr_el1);
 }
+
+void __hyp_text __sysreg32_save_state(struct kvm_vcpu *vcpu)
+{
+	if (!(read_sysreg(hcr_el2) & HCR_RW)) {
+		u64 *spsr = vcpu->arch.ctxt.gp_regs.spsr;
+		u64 *sysreg = vcpu->arch.ctxt.sys_regs;
+
+		spsr[KVM_SPSR_ABT] = read_sysreg(spsr_abt);
+		spsr[KVM_SPSR_UND] = read_sysreg(spsr_und);
+		spsr[KVM_SPSR_IRQ] = read_sysreg(spsr_irq);
+		spsr[KVM_SPSR_FIQ] = read_sysreg(spsr_fiq);
+
+		sysreg[DACR32_EL2] = read_sysreg(dacr32_el2);
+		sysreg[IFSR32_EL2] = read_sysreg(ifsr32_el2);
+
+		if (!(read_sysreg(cptr_el2) & CPTR_EL2_TFP))
+			sysreg[FPEXC32_EL2] = read_sysreg(fpexc32_el2);
+
+		if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
+			sysreg[DBGVCR32_EL2] = read_sysreg(dbgvcr32_el2);
+	}
+}
+
+void __hyp_text __sysreg32_restore_state(struct kvm_vcpu *vcpu)
+{
+	if (!(read_sysreg(hcr_el2) & HCR_RW)) {
+		u64 *spsr = vcpu->arch.ctxt.gp_regs.spsr;
+		u64 *sysreg = vcpu->arch.ctxt.sys_regs;
+
+		write_sysreg(spsr[KVM_SPSR_ABT], spsr_abt);
+		write_sysreg(spsr[KVM_SPSR_UND], spsr_und);
+		write_sysreg(spsr[KVM_SPSR_IRQ], spsr_irq);
+		write_sysreg(spsr[KVM_SPSR_FIQ], spsr_fiq);
+			                         
+		write_sysreg(sysreg[DACR32_EL2], dacr32_el2);
+		write_sysreg(sysreg[IFSR32_EL2], ifsr32_el2);
+
+		if (vcpu->arch.debug_flags & KVM_ARM64_DEBUG_DIRTY)
+			write_sysreg(sysreg[DBGVCR32_EL2], dbgvcr32_el2);
+	}
+}
-- 
2.1.4

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