[PATCH RFC v2 8/9] target/loongarch: Implement set vcpu intr for kvm

[Tianrui Zhao]

Implement loongarch kvm set vcpu interrupt interface,
when a irq is set in vcpu, we use the KVM_INTERRUPT
ioctl to set intr into kvm.

Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn>
---
 target/loongarch/cpu.c           | 18 +++++++++++++-----
 target/loongarch/kvm-stub.c      | 11 +++++++++++
 target/loongarch/kvm.c           | 16 ++++++++++++++++
 target/loongarch/kvm_loongarch.h | 13 +++++++++++++
 target/loongarch/trace-events    |  1 +
 5 files changed, 54 insertions(+), 5 deletions(-)
 create mode 100644 target/loongarch/kvm-stub.c
 create mode 100644 target/loongarch/kvm_loongarch.h

diff --git a/target/loongarch/cpu.c b/target/loongarch/cpu.c
index 600c00bbf2..d0b8f652a1 100644
--- a/target/loongarch/cpu.c
+++ b/target/loongarch/cpu.c
@@ -18,6 +18,11 @@
 #include "cpu-csr.h"
 #include "sysemu/reset.h"
 #include "tcg/tcg.h"
+#include "sysemu/kvm.h"
+#include "kvm_loongarch.h"
+#ifdef CONFIG_KVM
+#include <linux/kvm.h>
+#endif
 
 const char * const regnames[32] = {
     "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7",
@@ -104,12 +109,15 @@ void loongarch_cpu_set_irq(void *opaque, int irq, int 
level)
         return;
     }
 
-    env->CSR_ESTAT = deposit64(env->CSR_ESTAT, irq, 1, level != 0);
-
-    if (FIELD_EX64(env->CSR_ESTAT, CSR_ESTAT, IS)) {
-        cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+    if (kvm_enabled()) {
+        kvm_loongarch_set_interrupt(cpu, irq, level);
     } else {
-        cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+        env->CSR_ESTAT = deposit64(env->CSR_ESTAT, irq, 1, level != 0);
+        if (FIELD_EX64(env->CSR_ESTAT, CSR_ESTAT, IS)) {
+            cpu_interrupt(cs, CPU_INTERRUPT_HARD);
+        } else {
+            cpu_reset_interrupt(cs, CPU_INTERRUPT_HARD);
+        }
     }
 }
 
diff --git a/target/loongarch/kvm-stub.c b/target/loongarch/kvm-stub.c
new file mode 100644
index 0000000000..9965c1f119
--- /dev/null
+++ b/target/loongarch/kvm-stub.c
@@ -0,0 +1,11 @@
+/*
+ * QEMU KVM LoongArch specific function stubs
+ *
+ * Copyright (c) 2023 Loongson Technology Corporation Limited
+ */
+#include "cpu.h"
+
+void kvm_loongarch_set_interrupt(LoongArchCPU *cpu, int irq, int level)
+{
+   g_assert_not_reached();
+}
diff --git a/target/loongarch/kvm.c b/target/loongarch/kvm.c
index bd994926d9..e80ca8b37f 100644
--- a/target/loongarch/kvm.c
+++ b/target/loongarch/kvm.c
@@ -519,6 +519,22 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
     return ret;
 }
 
+int kvm_loongarch_set_interrupt(LoongArchCPU *cpu, int irq, int level)
+{
+    struct kvm_loongarch_interrupt intr;
+    CPUState *cs = CPU(cpu);
+
+    intr.cpu = cs->cpu_index;
+    if (level) {
+        intr.irq = irq;
+    } else {
+        intr.irq = -irq;
+    }
+
+    trace_kvm_set_intr(irq, level);
+    return kvm_vcpu_ioctl(cs, KVM_INTERRUPT, &intr);
+}
+
 void kvm_arch_accel_class_init(ObjectClass *oc)
 {
 }
diff --git a/target/loongarch/kvm_loongarch.h b/target/loongarch/kvm_loongarch.h
new file mode 100644
index 0000000000..cdef980eec
--- /dev/null
+++ b/target/loongarch/kvm_loongarch.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * QEMU LoongArch kvm interface
+ *
+ * Copyright (c) 2023 Loongson Technology Corporation Limited
+ */
+
+#ifndef QEMU_KVM_LOONGARCH_H
+#define QEMU_KVM_LOONGARCH_H
+
+int  kvm_loongarch_set_interrupt(LoongArchCPU *cpu, int irq, int level);
+
+#endif
diff --git a/target/loongarch/trace-events b/target/loongarch/trace-events
index c79e01663a..2673e43bfd 100644
--- a/target/loongarch/trace-events
+++ b/target/loongarch/trace-events
@@ -12,3 +12,4 @@ kvm_failed_put_mpstate(const char *msg) "Failed to put 
mp_state into KVM: %s"
 kvm_failed_get_counter(const char *msg) "Failed to get counter from KVM: %s"
 kvm_failed_put_counter(const char *msg) "Failed to put counter into KVM: %s"
 kvm_arch_handle_exit(int num) "kvm arch handle exit, the reason number: %d"
+kvm_set_intr(int irq, int level) "kvm set interrupt, irq num: %d, level: %d"
-- 
2.31.1