@samitouri / QOSamiQemu
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1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 /*
3 * LoongArch IPI interrupt KVM support
4 *
5 * Copyright (C) 2025 Loongson Technology Corporation Limited
6 */
7
8 #include "qemu/osdep.h"
9 #include "qapi/error.h"
10 #include "hw/intc/loongarch_ipi.h"
11 #include "system/kvm.h"
12 #include "target/loongarch/cpu.h"
13
14 static void kvm_ipi_access_reg(int fd, uint64_t addr, uint32_t *val, bool write)
15 {
16 kvm_device_access(fd, KVM_DEV_LOONGARCH_IPI_GRP_REGS,
17 addr, val, write, &error_abort);
18 }
19
20 static void kvm_ipi_access_regs(void *opaque, bool write)
21 {
22 LoongsonIPICommonState *ipi = (LoongsonIPICommonState *)opaque;
23 LoongarchIPIState *lis = LOONGARCH_IPI(opaque);
24 IPICore *core;
25 uint64_t attr;
26 int i, cpu_index, fd = lis->dev_fd;
27
28 if (fd == 0) {
29 return;
30 }
31
32 for (i = 0; i < ipi->num_cpu; i++) {
33 core = &ipi->cpu[i];
34 if (core->cpu == NULL) {
35 continue;
36 }
37 cpu_index = i;
38
39 attr = (cpu_index << 16) | CORE_STATUS_OFF;
40 kvm_ipi_access_reg(fd, attr, &core->status, write);
41
42 attr = (cpu_index << 16) | CORE_EN_OFF;
43 kvm_ipi_access_reg(fd, attr, &core->en, write);
44
45 attr = (cpu_index << 16) | CORE_SET_OFF;
46 kvm_ipi_access_reg(fd, attr, &core->set, write);
47
48 attr = (cpu_index << 16) | CORE_CLEAR_OFF;
49 kvm_ipi_access_reg(fd, attr, &core->clear, write);
50
51 attr = (cpu_index << 16) | CORE_BUF_20;
52 kvm_ipi_access_reg(fd, attr, &core->buf[0], write);
53
54 attr = (cpu_index << 16) | CORE_BUF_28;
55 kvm_ipi_access_reg(fd, attr, &core->buf[2], write);
56
57 attr = (cpu_index << 16) | CORE_BUF_30;
58 kvm_ipi_access_reg(fd, attr, &core->buf[4], write);
59
60 attr = (cpu_index << 16) | CORE_BUF_38;
61 kvm_ipi_access_reg(fd, attr, &core->buf[6], write);
62 }
63 }
64
65 int kvm_ipi_get(void *opaque)
66 {
67 kvm_ipi_access_regs(opaque, false);
68 return 0;
69 }
70
71 int kvm_ipi_put(void *opaque, int version_id)
72 {
73 kvm_ipi_access_regs(opaque, true);
74 return 0;
75 }
76
77 void kvm_ipi_realize(DeviceState *dev, Error **errp)
78 {
79 LoongarchIPIState *lis = LOONGARCH_IPI(dev);
80 int ret;
81
82 ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_IPI, false);
83 if (ret < 0) {
84 fprintf(stderr, "IPI KVM_CREATE_DEVICE failed: %s\n",
85 strerror(-ret));
86 abort();
87 }
88
89 lis->dev_fd = ret;
90 }