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

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Date:   Tue, 14 Feb 2023 10:58:11 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Tianrui Zhao <zhaotianrui@...ngson.cn>
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

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?

> 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