linux-kernel - Re: [PATCH v2 05/29] LoongArch: KVM: Add vcpu related header files

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Message-ID: <87268dce-1b5d-0556-7e65-2a75a7893cd1@redhat.com>
Date:   Tue, 21 Feb 2023 08:35:58 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Xi Ruoyao <xry111@...111.site>, maobibo <maobibo@...ngson.cn>,
        Tianrui Zhao <zhaotianrui@...ngson.cn>
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>
Subject: Re: [PATCH v2 05/29] LoongArch: KVM: Add vcpu related header files

On 2/21/23 08:12, Xi Ruoyao wrote:
>> We are preparing to submit these instruction support for binutils,
>> however it is still necessary. Supposing that it is supported in future
>> gcc version, we can not drop existing gcc 12/13 supporting to compiling
>> kernel with LoongArch architecture.
> You can drop the support for KVM with less capable Binutils versions,
> like:
> 
> config AS_HAS_LVZ
>      def_bool $(as-instr some_gcsr_insn \$r0, \$gcsr0)
> 
> config KVM
>      depends on AS_HAS_LVZ
> 

There are precedents in Linux for using .word when necessary.  There's 
no reason to prevent using KVM on old Binutils versions.

Paolo