linux-kernel - Re: [PATCH v4 09/12] KVM: selftests: Only do get/set tests on present blessed list

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Message-ID: <20230627-adcb173b3ee813e2e16353bd@orel>
Date:   Tue, 27 Jun 2023 11:11:05 +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>,
        Ben Gardon <bgardon@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Ricardo Koller <ricarkol@...gle.com>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Vipin Sharma <vipinsh@...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 v4 09/12] KVM: selftests: Only do get/set tests on
 present blessed list

On Fri, Jun 23, 2023 at 06:40:11PM +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>
> ---
>  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 b956ee410996..3beb6b62de0a 100644
> --- a/tools/testing/selftests/kvm/get-reg-list.c
> +++ b/tools/testing/selftests/kvm/get-reg-list.c
> @@ -52,6 +52,10 @@ 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]))
> +
>  static const char *config_name(struct vcpu_reg_list *c)
>  {
>  	struct vcpu_reg_sublist *s;
> @@ -189,6 +193,16 @@ static void run_test(struct vcpu_reg_list *c)
>  		return;
>  	}
>  
> +	for_each_sublist(c, s)
> +		blessed_n += s->regs_n;
> +	blessed_reg = calloc(blessed_n, sizeof(__u64));
> +
> +	n = 0;
> +	for_each_sublist(c, s) {
> +		for (i = 0; i < s->regs_n; ++i)
> +			blessed_reg[n++] = s->regs[i];
> +	}
> +
>  	/*
>  	 * We only test that we can get the register and then write back the
>  	 * same value. Some registers may allow other values to be written
> @@ -198,8 +212,11 @@ static void run_test(struct vcpu_reg_list *c)
>  	 * be written need to have the other values tested, then we should
>  	 * create a new set of tests for those in a new independent test
>  	 * executable.
> +	 *
> +	 * Only do the get/set tests on present, blessed list registers,
> +	 * since we don't know the capabilities of any new registers.
>  	 */
> -	for_each_reg(i) {
> +	for_each_present_blessed_reg(i) {
>  		uint8_t addr[2048 / 8];
>  		struct kvm_one_reg reg = {
>  			.id = reg_list->reg[i],
> @@ -242,16 +259,6 @@ static void run_test(struct vcpu_reg_list *c)
>  		}
>  	}
>  
> -	for_each_sublist(c, s)
> -		blessed_n += s->regs_n;
> -	blessed_reg = calloc(blessed_n, sizeof(__u64));
> -
> -	n = 0;
> -	for_each_sublist(c, s) {
> -		for (i = 0; i < s->regs_n; ++i)
> -			blessed_reg[n++] = s->regs[i];
> -	}
> -
>  	for_each_new_reg(i)
>  		++new_regs;
>  
> -- 
> 2.34.1
>

Reviewed-by: Andrew Jones <ajones@...tanamicro.com>

Thanks,
drew