linux-kernel - Re: [PATCH v2 01/29] LoongArch: KVM: Add kvm related header files

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Message-ID: <ef024d7e4e0207e76c165c1818d1bb21f07235ab.camel@xry111.site>
Date:   Tue, 21 Feb 2023 12:36:58 +0800
From:   Xi Ruoyao <xry111@...111.site>
To:     Tianrui Zhao <zhaotianrui@...ngson.cn>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Huacai Chen <chenhuacai@...nel.org>,
        WANG Xuerui <kernel@...0n.name>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        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>,
        Oliver Upton <oliver.upton@...ux.dev>, maobibo@...ngson.cn
Subject: Re: [PATCH v2 01/29] LoongArch: KVM: Add kvm related header files

On Mon, 2023-02-20 at 14:57 +0800, Tianrui Zhao wrote:

/* snip */

> +/*
> + * for KVM_GET_FPU and KVM_SET_FPU
> + */
> +struct kvm_fpu {
> +	__u32 fcsr;
> +	__u32 none;
> +	__u64 fcc;    /* 8x8 */
> +	struct kvm_fpureg {
> +		__u64 val64[4];	//support max 256 bits
> +	} fpr[32];

Do we need __attribute__((__aligned__(16))) for fpureg (like
sc_extcontext in struct sigcontext)?

> +};
> +
> +/*
> + * For LOONGARCH, we use KVM_SET_ONE_REG and KVM_GET_ONE_REG to
          ^^^^^^^^^
          LoongArch

> access various
> + * registers.  The id field is broken down as follows:
> + *
> + *  bits[63..52] - As per linux/kvm.h
> + *  bits[51..32] - Must be zero.
> + *  bits[31..16] - Register set.

-- 
Xi Ruoyao <xry111@...111.site>
School of Aerospace Science and Technology, Xidian University