1 files changed, 90 insertions, 0 deletions
diff --git a/hw/intc/loongarch_ipi_kvm.c b/hw/intc/loongarch_ipi_kvm.c
new file mode 100644
index 0000000..dd4c367
--- /dev/null
+++ b/hw/intc/loongarch_ipi_kvm.c
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch IPI interrupt KVM support
+ *
+ * Copyright (C) 2025 Loongson Technology Corporation Limited
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "hw/intc/loongarch_ipi.h"
+#include "system/kvm.h"
+#include "target/loongarch/cpu.h"
+
+static void kvm_ipi_access_reg(int fd, uint64_t addr, uint32_t *val, bool write)
+{
+    kvm_device_access(fd, KVM_DEV_LOONGARCH_IPI_GRP_REGS,
+                      addr, val, write, &error_abort);
+}
+
+static void kvm_ipi_access_regs(void *opaque, bool write)
+{
+    LoongsonIPICommonState *ipi = (LoongsonIPICommonState *)opaque;
+    LoongarchIPIState *lis = LOONGARCH_IPI(opaque);
+    IPICore *core;
+    uint64_t attr;
+    int i, cpu_index, fd = lis->dev_fd;
+
+    if (fd == 0) {
+        return;
+    }
+
+    for (i = 0; i < ipi->num_cpu; i++) {
+        core = &ipi->cpu[i];
+        if (core->cpu == NULL) {
+            continue;
+        }
+        cpu_index = i;
+
+        attr = (cpu_index << 16) | CORE_STATUS_OFF;
+        kvm_ipi_access_reg(fd, attr, &core->status, write);
+
+        attr = (cpu_index << 16) | CORE_EN_OFF;
+        kvm_ipi_access_reg(fd, attr, &core->en, write);
+
+        attr = (cpu_index << 16) | CORE_SET_OFF;
+        kvm_ipi_access_reg(fd, attr, &core->set, write);
+
+        attr = (cpu_index << 16) | CORE_CLEAR_OFF;
+        kvm_ipi_access_reg(fd, attr, &core->clear, write);
+
+        attr = (cpu_index << 16) | CORE_BUF_20;
+        kvm_ipi_access_reg(fd, attr, &core->buf[0], write);
+
+        attr = (cpu_index << 16) | CORE_BUF_28;
+        kvm_ipi_access_reg(fd, attr, &core->buf[2], write);
+
+        attr = (cpu_index << 16) | CORE_BUF_30;
+        kvm_ipi_access_reg(fd, attr, &core->buf[4], write);
+
+        attr = (cpu_index << 16) | CORE_BUF_38;
+        kvm_ipi_access_reg(fd, attr, &core->buf[6], write);
+    }
+}
+
+int kvm_ipi_get(void *opaque)
+{
+    kvm_ipi_access_regs(opaque, false);
+    return 0;
+}
+
+int kvm_ipi_put(void *opaque, int version_id)
+{
+    kvm_ipi_access_regs(opaque, true);
+    return 0;
+}
+
+void kvm_ipi_realize(DeviceState *dev, Error **errp)
+{
+    LoongarchIPIState *lis = LOONGARCH_IPI(dev);
+    int ret;
+
+    ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_IPI, false);
+    if (ret < 0) {
+        fprintf(stderr, "IPI KVM_CREATE_DEVICE failed: %s\n",
+                strerror(-ret));
+        abort();
+    }
+
+    lis->dev_fd = ret;
+}