[RFC PATCH 25/28] arm64: rme: support RSI_HOST_CALL

[Steven Price]

From: Joey Gouly <joey.gouly@xxxxxxx>

Forward RSI_HOST_CALLS to KVM's HVC handler.

Signed-off-by: Joey Gouly <joey.gouly@xxxxxxx>
Signed-off-by: Steven Price <steven.price@xxxxxxx>
---
 arch/arm64/kvm/rme-exit.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/arch/arm64/kvm/rme-exit.c b/arch/arm64/kvm/rme-exit.c
index 15a4ff3517db..fcdc87e8f6bc 100644
--- a/arch/arm64/kvm/rme-exit.c
+++ b/arch/arm64/kvm/rme-exit.c
@@ -4,6 +4,7 @@
  */
 
 #include <linux/kvm_host.h>
+#include <kvm/arm_hypercalls.h>
 #include <kvm/arm_psci.h>
 
 #include <asm/rmi_smc.h>
@@ -98,6 +99,29 @@ static int rec_exit_ripas_change(struct kvm_vcpu *vcpu)
 	return 1;
 }
 
+static int rec_exit_host_call(struct kvm_vcpu *vcpu)
+{
+	int ret, i;
+	struct rec *rec = &vcpu->arch.rec;
+
+	vcpu->stat.hvc_exit_stat++;
+
+	for (i = 0; i < REC_RUN_GPRS; i++)
+		vcpu_set_reg(vcpu, i, rec->run->exit.gprs[i]);
+
+	ret = kvm_hvc_call_handler(vcpu);
+
+	if (ret < 0) {
+		vcpu_set_reg(vcpu, 0, ~0UL);
+		ret = 1;
+	}
+
+	for (i = 0; i < REC_RUN_GPRS; i++)
+		rec->run->entry.gprs[i] = vcpu_get_reg(vcpu, i);
+
+	return ret;
+}
+
 static void update_arch_timer_irq_lines(struct kvm_vcpu *vcpu)
 {
 	struct rec *rec = &vcpu->arch.rec;
@@ -159,6 +183,8 @@ int handle_rme_exit(struct kvm_vcpu *vcpu, int rec_run_ret)
 		return rec_exit_psci(vcpu);
 	case RMI_EXIT_RIPAS_CHANGE:
 		return rec_exit_ripas_change(vcpu);
+	case RMI_EXIT_HOST_CALL:
+		return rec_exit_host_call(vcpu);
 	}
 
 	kvm_pr_unimpl("Unsupported exit reason: %u\n",
-- 
2.34.1