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https://github.com/Motorhead1991/qemu.git
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c642ddf19b
When system reboot, interrupt controller is restored to initial state. However if interrupt controller extioi/ipi/pch_pic is emulated in kernel, it should notify kvm to do so. Here suspend and restore API is used for reset, set initial state in qemu user space and restore API is used to notify kvm to reload register state. Reviewed-by: Song Gao <gaosong@loongson.cn> Signed-off-by: Bibo Mao <maobibo@loongson.cn> Message-ID: <20250606063033.2557365-11-maobibo@loongson.cn> Signed-off-by: Song Gao <gaosong@loongson.cn>
85 lines
2.2 KiB
C
85 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* LoongArch IPI interrupt KVM support
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*
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* Copyright (C) 2025 Loongson Technology Corporation Limited
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*/
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#include "qemu/osdep.h"
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#include "qapi/error.h"
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#include "hw/intc/loongarch_ipi.h"
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#include "system/kvm.h"
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#include "target/loongarch/cpu.h"
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static void kvm_ipi_access_reg(int fd, uint64_t addr, uint32_t *val, bool write)
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{
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kvm_device_access(fd, KVM_DEV_LOONGARCH_IPI_GRP_REGS,
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addr, val, write, &error_abort);
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}
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static void kvm_ipi_access_regs(void *opaque, bool write)
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{
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LoongsonIPICommonState *ipi = (LoongsonIPICommonState *)opaque;
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LoongarchIPIState *lis = LOONGARCH_IPI(opaque);
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IPICore *core;
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uint64_t attr;
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int cpu, fd = lis->dev_fd;
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if (fd == 0) {
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return;
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}
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for (cpu = 0; cpu < ipi->num_cpu; cpu++) {
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core = &ipi->cpu[cpu];
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attr = (cpu << 16) | CORE_STATUS_OFF;
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kvm_ipi_access_reg(fd, attr, &core->status, write);
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attr = (cpu << 16) | CORE_EN_OFF;
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kvm_ipi_access_reg(fd, attr, &core->en, write);
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attr = (cpu << 16) | CORE_SET_OFF;
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kvm_ipi_access_reg(fd, attr, &core->set, write);
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attr = (cpu << 16) | CORE_CLEAR_OFF;
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kvm_ipi_access_reg(fd, attr, &core->clear, write);
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attr = (cpu << 16) | CORE_BUF_20;
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kvm_ipi_access_reg(fd, attr, &core->buf[0], write);
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attr = (cpu << 16) | CORE_BUF_28;
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kvm_ipi_access_reg(fd, attr, &core->buf[2], write);
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attr = (cpu << 16) | CORE_BUF_30;
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kvm_ipi_access_reg(fd, attr, &core->buf[4], write);
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attr = (cpu << 16) | CORE_BUF_38;
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kvm_ipi_access_reg(fd, attr, &core->buf[6], write);
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}
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}
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int kvm_ipi_get(void *opaque)
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{
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kvm_ipi_access_regs(opaque, false);
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return 0;
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}
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int kvm_ipi_put(void *opaque, int version_id)
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{
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kvm_ipi_access_regs(opaque, true);
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return 0;
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}
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void kvm_ipi_realize(DeviceState *dev, Error **errp)
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{
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LoongarchIPIState *lis = LOONGARCH_IPI(dev);
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int ret;
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ret = kvm_create_device(kvm_state, KVM_DEV_TYPE_LOONGARCH_IPI, false);
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if (ret < 0) {
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fprintf(stderr, "IPI KVM_CREATE_DEVICE failed: %s\n",
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strerror(-ret));
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abort();
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}
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lis->dev_fd = ret;
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}
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