[RFC v2 13/14] arm/kvm: handle guest exit of hypercall

[Heyi Guo <guoheyi@huawei.com>]

Add support to handle guest exit of hypercall, and forward to SDEI
dispatcher if SDEI is enabled and it is an SDEI request.

Signed-off-by: Heyi Guo <guoheyi@huawei.com>
Cc: Peter Maydell <peter.maydell@linaro.org>
Cc: Dave Martin <Dave.Martin@arm.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: James Morse <james.morse@arm.com>
---
 target/arm/kvm.c | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/target/arm/kvm.c b/target/arm/kvm.c
index b473c63edb..035a39e49f 100644
--- a/target/arm/kvm.c
+++ b/target/arm/kvm.c
@@ -30,6 +30,7 @@
 #include "hw/boards.h"
 #include "hw/irq.h"
 #include "qemu/log.h"
+#include "sdei.h"
 
 const KVMCapabilityInfo kvm_arch_required_capabilities[] = {
     KVM_CAP_LAST_INFO
@@ -676,6 +677,19 @@ MemTxAttrs kvm_arch_post_run(CPUState *cs, struct kvm_run *run)
 }
 
 
+static void kvm_arm_handle_hypercall(CPUState *cs, struct kvm_run *run)
+{
+    uint32_t func_id = run->hypercall.args[0];
+
+    if (sdei_enabled &&
+        func_id >= SDEI_1_0_FN_BASE && func_id <= SDEI_MAX_REQ) {
+        sdei_handle_request(cs, run);
+        return;
+    }
+
+    run->hypercall.args[0] = -1;
+}
+
 int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
 {
     int ret = 0;
@@ -686,6 +700,9 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
             ret = EXCP_DEBUG;
         } /* otherwise return to guest */
         break;
+    case KVM_EXIT_HYPERCALL:
+        kvm_arm_handle_hypercall(cs, run);
+        break;
     default:
         qemu_log_mask(LOG_UNIMP, "%s: un-handled exit reason %d\n",
                       __func__, run->exit_reason);
-- 
2.19.1