linux-kernel - Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related interface

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Message-ID: <a44fc722-e3e2-7f8a-0454-f27a8a10d52b@loongson.cn>
Date:   Tue, 14 Feb 2023 21:00:50 +0800
From:   Tianrui Zhao <zhaotianrui@...ngson.cn>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>, loongarch@...ts.linux.dev,
        linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        Jens Axboe <axboe@...nel.dk>, Mark Brown <broonie@...nel.org>,
        Alex Deucher <alexander.deucher@....com>
Subject: Re: [PATCH v1 01/24] LoongArch: KVM: Implement kvm module related
 interface



在 2023年02月14日 17:58, Greg Kroah-Hartman 写道:
> On Tue, Feb 14, 2023 at 05:00:56PM +0800, Tianrui Zhao wrote:
>>>> +#define KVM_GET_CSRS		_IOWR(KVMIO, 0xc5, struct kvm_csrs)
>>>> +#define KVM_SET_CSRS		_IOW(KVMIO,  0xc6, struct kvm_csrs)
>>> Why does this arch need new ioctls?
>> We want to use this ioctl to access multiple csrs at one time. If without
>> this, we only access one csr.
> What is wrong with accessing only one csr at a time?  Isn't this what
> other architectures do?

Generally, using KVM_GET_ONE_GET ioctl to get one reg, but we want a
more convenient interface to get serial regs at one time, so we add this
ioctl.
And in x86 platform, using KVM_GET_MSRS to access multiple registers. and
our functions reference this.

Thanks,
Tianrui Zhao

>
>> There is another function, can we use the KVM_GET/SET_MSRS to access our
>> csrs?
> I do not know, that's up to the KVM developers to answer.
>
> thanks,
>
> greg k-h