linux-kernel - Re: [PATCH 1/2] riscv: kvm: Add KVM_GET_REG

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Message-ID: <20230511-d0a207eebb30fc88de875e4f@orel>
Date:   Thu, 11 May 2023 18:40:05 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Haibo Xu <haibo1.xu@...el.com>
Cc:     xiaobo55x@...il.com, Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Anup Patel <anup@...infault.org>,
        Atish Patra <atishp@...shpatra.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Shuah Khan <shuah@...nel.org>, kvm@...r.kernel.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-kselftest@...r.kernel.org
Subject: Re: [PATCH 1/2] riscv: kvm: Add KVM_GET_REG_LIST API support

On Thu, May 11, 2023 at 05:22:48PM +0800, Haibo Xu wrote:
> KVM_GET_REG_LIST API will return all registers that are available to
> KVM_GET/SET_ONE_REG APIs. It's very useful to identify some platform
> regression issue during VM migration.
> 
> Since this API was already supported on arm64, it'd be straightforward
> to enable it on riscv with similar code structure.
> 
> Signed-off-by: Haibo Xu <haibo1.xu@...el.com>
> ---
>  Documentation/virt/kvm/api.rst |   2 +-
>  arch/riscv/kvm/vcpu.c          | 346 +++++++++++++++++++++++++++++++++
>  2 files changed, 347 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/virt/kvm/api.rst b/Documentation/virt/kvm/api.rst
> index add067793b90..280e89abd004 100644
> --- a/Documentation/virt/kvm/api.rst
> +++ b/Documentation/virt/kvm/api.rst
> @@ -3499,7 +3499,7 @@ VCPU matching underlying host.
>  ---------------------
>  
>  :Capability: basic
> -:Architectures: arm64, mips
> +:Architectures: arm64, mips, riscv
>  :Type: vcpu ioctl
>  :Parameters: struct kvm_reg_list (in/out)
>  :Returns: 0 on success; -1 on error
> diff --git a/arch/riscv/kvm/vcpu.c b/arch/riscv/kvm/vcpu.c
> index 8bd9f2a8a0b9..fb8834e4fa15 100644
> --- a/arch/riscv/kvm/vcpu.c
> +++ b/arch/riscv/kvm/vcpu.c
> @@ -657,6 +657,334 @@ static int kvm_riscv_vcpu_set_reg_isa_ext(struct kvm_vcpu *vcpu,
>  	return 0;
>  }
>  
> +static inline unsigned long num_config_regs(void)
> +{
> +	return sizeof(struct kvm_riscv_config) / sizeof(unsigned long);

We can't assume all config registers are present. For example,
zicbom and zicboz block size registers are only present when their
respective extensions are available.

Thanks,
drew