linux-kernel - Re: [PATCH v5 10/13] KVM: selftests: Only do get/set tests on present blessed list

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Message-ID: <20230702-49c5545eb1ae2d0cf11c7b95@orel>
Date:   Mon, 3 Jul 2023 10:18:35 +0200
From:   Andrew Jones <ajones@...tanamicro.com>
To:     Haibo Xu <haibo1.xu@...el.com>
Cc:     xiaobo55x@...il.com, maz@...nel.org, oliver.upton@...ux.dev,
        seanjc@...gle.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>,
        James Morse <james.morse@....com>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Vipin Sharma <vipinsh@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Colton Lewis <coltonlewis@...gle.com>, 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,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev
Subject: Re: [PATCH v5 10/13] KVM: selftests: Only do get/set tests on
 present blessed list

On Sat, Jul 01, 2023 at 09:42:58PM +0800, Haibo Xu wrote:
> Only do the get/set tests on present and blessed registers
> since we don't know the capabilities of any new ones.
> 
> Suggested-by: Andrew Jones <ajones@...tanamicro.com>
> Signed-off-by: Haibo Xu <haibo1.xu@...el.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  tools/testing/selftests/kvm/get-reg-list.c | 29 ++++++++++++++--------
>  1 file changed, 18 insertions(+), 11 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/get-reg-list.c b/tools/testing/selftests/kvm/get-reg-list.c
> index c61090806007..74fb6f6fdd09 100644
> --- a/tools/testing/selftests/kvm/get-reg-list.c
> +++ b/tools/testing/selftests/kvm/get-reg-list.c
> @@ -49,6 +49,10 @@ extern int vcpu_configs_n;
>  	for_each_reg_filtered(i)						\
>  		if (!find_reg(blessed_reg, blessed_n, reg_list->reg[i]))
>  
> +#define for_each_present_blessed_reg(i)			\
> +	for ((i) = 0; (i) < blessed_n; ++(i))		\
> +		if (find_reg(reg_list->reg, reg_list->n, blessed_reg[i]))

I just realized this is backwards. We need 'i' to index reg_list->reg in
the body of the loop. That means we need to write this as

#define for_each_present_blessed_reg(i)                                         \
        for_each_reg(i)                                                         \
                if (find_reg(blessed_reg, blessed_n, reg_list->reg[i]))

(Which, in hindsight, makes sense since we're replacing a for_each_reg()
loop.)

Thanks,
drew