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

Steven Price
2023-01-27T11:42:32Z

From: Joey Gouly <joey.gouly@arm.com>

Forward RSI_HOST_CALLS to KVM's HVC handler.

Signed-off-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
---
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