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 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 60 int kvm_ipi_get(void *opaque) 61 { 62 kvm_ipi_access_regs(opaque, false); 63 return 0; 64 } 65 66 int kvm_ipi_put(void *opaque, int version_id) 67 { 68 kvm_ipi_access_regs(opaque, true); 69 return 0; 70 } 71 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