xref: /qemu/hw/intc/loongarch_ipi_kvm.c (revision d01d42ccc9510c039b2e4ec49af164e374eab154)
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