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 } 91