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
kvm_ipi_access_reg(int fd,uint64_t addr,uint32_t * val,bool write)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
kvm_ipi_access_regs(void * opaque,bool write)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 cpu, fd = lis->dev_fd;
27
28 if (fd == 0) {
29 return;
30 }
31
32 for (cpu = 0; cpu < ipi->num_cpu; cpu++) {
33 core = &ipi->cpu[cpu];
34 attr = (cpu << 16) | CORE_STATUS_OFF;
35 kvm_ipi_access_reg(fd, attr, &core->status, write);
36
37 attr = (cpu << 16) | CORE_EN_OFF;
38 kvm_ipi_access_reg(fd, attr, &core->en, write);
39
40 attr = (cpu << 16) | CORE_SET_OFF;
41 kvm_ipi_access_reg(fd, attr, &core->set, write);
42
43 attr = (cpu << 16) | CORE_CLEAR_OFF;
44 kvm_ipi_access_reg(fd, attr, &core->clear, write);
45
46 attr = (cpu << 16) | CORE_BUF_20;
47 kvm_ipi_access_reg(fd, attr, &core->buf[0], write);
48
49 attr = (cpu << 16) | CORE_BUF_28;
50 kvm_ipi_access_reg(fd, attr, &core->buf[2], write);
51
52 attr = (cpu << 16) | CORE_BUF_30;
53 kvm_ipi_access_reg(fd, attr, &core->buf[4], write);
54
55 attr = (cpu << 16) | CORE_BUF_38;
56 kvm_ipi_access_reg(fd, attr, &core->buf[6], write);
57 }
58 }
59
kvm_ipi_get(void * opaque)60 int kvm_ipi_get(void *opaque)
61 {
62 kvm_ipi_access_regs(opaque, false);
63 return 0;
64 }
65
kvm_ipi_put(void * opaque,int version_id)66 int kvm_ipi_put(void *opaque, int version_id)
67 {
68 kvm_ipi_access_regs(opaque, true);
69 return 0;
70 }
71
kvm_ipi_realize(DeviceState * dev,Error ** errp)72 void kvm_ipi_realize(DeviceState *dev, Error **errp)
73 {
74 LoongarchIPIState *lis = LOONGARCH_IPI(dev);
75 int ret;
76
77 ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_IPI, false);
78 if (ret < 0) {
79 fprintf(stderr, "IPI KVM_CREATE_DEVICE failed: %s\n",
80 strerror(-ret));
81 abort();
82 }
83
84 lis->dev_fd = ret;
85 }
86