LoongArch: KVM: Set default return value in KVM IO bus ops

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When in-kernel irqchip is enabled, its register area is registered in
the KVM IO bus list with API kvm_io_bus_register_dev(). In MMIO/IOCSR
register access emulation, kvm_io_bus_read()/kvm_io_bus_write() is
called firstly. If it returns 0, it means that the in-kernel irqchip
handles the emulation already, else it returns to user-mode VMM and
lets VMM emulate the register access.

Once in-kernel irqchip is enabled, it should return 0 if the address
is within range of the registered KVM IO bus. It should not return to
user-mode VMM since VMM does not know how to handle it, and irqchip is
handled in kernel already.

Here set default return value with 0 in KVM IO bus operations.

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>

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This commit is contained in:

Bibo Mao 2026-02-06 09:28:00 +08:00 • committed by Huacai Chen

parent 382c38c9ec

commit 2faec60a48

3 changed files with 39 additions and 61 deletions

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43

arch/loongarch/kvm/intc/eiointc.c

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26

arch/loongarch/kvm/intc/ipi.c

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31

arch/loongarch/kvm/intc/pch_pic.c

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