492265ae8b
Certain validations, such as the validations done for the machine IDs (mvendorid/marchid/mimpid), are done before starting the CPU. Non-dynamic (named) CPUs tries to match user input with a preset default. As it is today we can't prefetch a KVM default for these cases because we're only able to read/write KVM regs after the vcpu is spinning. Our target/arm friends use a concept called "scratch CPU", which consists of creating a vcpu for doing queries and validations and so on, which is discarded shortly after use [1]. This is a suitable solution for what we need so let's implement it in target/riscv as well. kvm_riscv_init_machine_ids() will be used to do any pre-launch setup for KVM CPUs, via riscv_cpu_add_user_properties(). The function will create a KVM scratch CPU, fetch KVM regs that work as default values for user properties, and then discard the scratch CPU afterwards. We're starting by initializing 'mvendorid'. This concept will be used to init other KVM specific properties in the next patches as well. [1] target/arm/kvm.c, kvm_arm_create_scratch_host_vcpu() Suggested-by: Andrew Jones <ajones@ventanamicro.com> Signed-off-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Acked-by: Alistair Francis <alistair.francis@wdc.com> Message-Id: <20230706101738.460804-7-dbarboza@ventanamicro.com> Signed-off-by: Alistair Francis <alistair.francis@wdc.com>
27 lines
931 B
C
27 lines
931 B
C
/*
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* QEMU KVM support -- RISC-V specific functions.
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*
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* Copyright (c) 2020 Huawei Technologies Co., Ltd
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2 or later, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef QEMU_KVM_RISCV_H
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#define QEMU_KVM_RISCV_H
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void kvm_riscv_init_user_properties(Object *cpu_obj);
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void kvm_riscv_reset_vcpu(RISCVCPU *cpu);
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void kvm_riscv_set_irq(RISCVCPU *cpu, int irq, int level);
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#endif
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