1 files changed, 140 insertions, 0 deletions
diff --git a/hw/intc/loongarch_extioi_kvm.c b/hw/intc/loongarch_extioi_kvm.c
new file mode 100644
index 0000000..0133540
--- /dev/null
+++ b/hw/intc/loongarch_extioi_kvm.c
@@ -0,0 +1,140 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * LoongArch EXTIOI interrupt kvm support
+ *
+ * Copyright (C) 2025 Loongson Technology Corporation Limited
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/typedefs.h"
+#include "hw/intc/loongarch_extioi.h"
+#include "linux/kvm.h"
+#include "qapi/error.h"
+#include "system/kvm.h"
+
+static void kvm_extioi_access_reg(int fd, uint64_t addr, void *val, bool write)
+{
+    kvm_device_access(fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_REGS,
+                      addr, val, write, &error_abort);
+}
+
+static void kvm_extioi_access_sw_state(int fd, uint64_t addr,
+                                       void *val, bool write)
+{
+    kvm_device_access(fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_SW_STATUS,
+                      addr, val, write, &error_abort);
+}
+
+static void kvm_extioi_access_sw_status(void *opaque, bool write)
+{
+    LoongArchExtIOICommonState *lecs = LOONGARCH_EXTIOI_COMMON(opaque);
+    LoongArchExtIOIState *les = LOONGARCH_EXTIOI(opaque);
+    int addr;
+
+    addr = KVM_DEV_LOONGARCH_EXTIOI_SW_STATUS_STATE;
+    kvm_extioi_access_sw_state(les->dev_fd, addr, &lecs->status, write);
+}
+
+static void kvm_extioi_access_regs(void *opaque, bool write)
+{
+    LoongArchExtIOICommonState *lecs = LOONGARCH_EXTIOI_COMMON(opaque);
+    LoongArchExtIOIState *les = LOONGARCH_EXTIOI(opaque);
+    int fd = les->dev_fd;
+    int addr, offset, cpu;
+
+    for (addr = EXTIOI_NODETYPE_START; addr < EXTIOI_NODETYPE_END; addr += 4) {
+        offset = (addr - EXTIOI_NODETYPE_START) / 4;
+        kvm_extioi_access_reg(fd, addr, &lecs->nodetype[offset], write);
+    }
+
+    for (addr = EXTIOI_IPMAP_START; addr < EXTIOI_IPMAP_END; addr += 4) {
+        offset = (addr - EXTIOI_IPMAP_START) / 4;
+        kvm_extioi_access_reg(fd, addr, &lecs->ipmap[offset], write);
+    }
+
+    for (addr = EXTIOI_ENABLE_START; addr < EXTIOI_ENABLE_END; addr += 4) {
+        offset = (addr - EXTIOI_ENABLE_START) / 4;
+        kvm_extioi_access_reg(fd, addr, &lecs->enable[offset], write);
+    }
+
+    for (addr = EXTIOI_BOUNCE_START; addr < EXTIOI_BOUNCE_END; addr += 4) {
+        offset = (addr - EXTIOI_BOUNCE_START) / 4;
+        kvm_extioi_access_reg(fd, addr, &lecs->bounce[offset], write);
+    }
+
+    for (addr = EXTIOI_ISR_START; addr < EXTIOI_ISR_END; addr += 4) {
+        offset = (addr - EXTIOI_ISR_START) / 4;
+        kvm_extioi_access_reg(fd, addr, &lecs->isr[offset], write);
+    }
+
+    for (addr = EXTIOI_COREMAP_START; addr < EXTIOI_COREMAP_END; addr += 4) {
+        offset = (addr - EXTIOI_COREMAP_START) / 4;
+        kvm_extioi_access_reg(fd, addr, &lecs->coremap[offset], write);
+    }
+
+    for (cpu = 0; cpu < lecs->num_cpu; cpu++) {
+        for (addr = EXTIOI_COREISR_START;
+             addr < EXTIOI_COREISR_END; addr += 4) {
+            offset = (addr - EXTIOI_COREISR_START) / 4;
+            kvm_extioi_access_reg(fd, (cpu << 16) | addr,
+                                  &lecs->cpu[cpu].coreisr[offset], write);
+        }
+    }
+}
+
+int kvm_extioi_get(void *opaque)
+{
+    kvm_extioi_access_regs(opaque, false);
+    kvm_extioi_access_sw_status(opaque, false);
+    return 0;
+}
+
+int kvm_extioi_put(void *opaque, int version_id)
+{
+    LoongArchExtIOIState *les = LOONGARCH_EXTIOI(opaque);
+    int fd = les->dev_fd;
+
+    if (fd == 0) {
+        return 0;
+    }
+
+    kvm_extioi_access_regs(opaque, true);
+    kvm_extioi_access_sw_status(opaque, true);
+    kvm_device_access(fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL,
+                      KVM_DEV_LOONGARCH_EXTIOI_CTRL_LOAD_FINISHED,
+                      NULL, true, &error_abort);
+    return 0;
+}
+
+void kvm_extioi_realize(DeviceState *dev, Error **errp)
+{
+    LoongArchExtIOICommonState *lecs = LOONGARCH_EXTIOI_COMMON(dev);
+    LoongArchExtIOIState *les = LOONGARCH_EXTIOI(dev);
+    int ret;
+
+    ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_EIOINTC, false);
+    if (ret < 0) {
+        fprintf(stderr, "create KVM_LOONGARCH_EIOINTC failed: %s\n",
+                strerror(-ret));
+        abort();
+    }
+
+    les->dev_fd = ret;
+    ret = kvm_device_access(les->dev_fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL,
+                            KVM_DEV_LOONGARCH_EXTIOI_CTRL_INIT_NUM_CPU,
+                            &lecs->num_cpu, true, NULL);
+    if (ret < 0) {
+        fprintf(stderr, "KVM_LOONGARCH_EXTIOI_INIT_NUM_CPU failed: %s\n",
+                strerror(-ret));
+        abort();
+    }
+
+    ret = kvm_device_access(les->dev_fd, KVM_DEV_LOONGARCH_EXTIOI_GRP_CTRL,
+                            KVM_DEV_LOONGARCH_EXTIOI_CTRL_INIT_FEATURE,
+                            &lecs->features, true, NULL);
+    if (ret < 0) {
+        fprintf(stderr, "KVM_LOONGARCH_EXTIOI_INIT_FEATURE failed: %s\n",
+                strerror(-ret));
+        abort();
+    }
+}