linux-kernel - Re: [PATCH v3 09/10] KVM: riscv: selftests: Skip some registers set operation

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Message-ID: <20230609-05521f954b0485c69612f00b@orel>
Date:   Fri, 9 Jun 2023 11:24:38 +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>,
        David Matlack <dmatlack@...gle.com>,
        Ben Gardon <bgardon@...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 v3 09/10] KVM: riscv: selftests: Skip some registers set
 operation

On Fri, Jun 09, 2023 at 10:12:17AM +0800, Haibo Xu wrote:
> Set operation on some riscv registers(mostly pesudo ones) was not
> supported and should be skipped in the get-reg-list test. Just
> reuse the rejects_set utilities to handle it in riscv.
> 
> Signed-off-by: Haibo Xu <haibo1.xu@...el.com>
> Reviewed-by: Andrew Jones <ajones@...tanamicro.com>
> ---
>  tools/testing/selftests/kvm/get-reg-list.c | 20 +++++++++++++-------
>  1 file changed, 13 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/get-reg-list.c b/tools/testing/selftests/kvm/get-reg-list.c
> index c4bd5a5259da..abacb95c21c6 100644
> --- a/tools/testing/selftests/kvm/get-reg-list.c
> +++ b/tools/testing/selftests/kvm/get-reg-list.c
> @@ -211,16 +211,22 @@ static void run_test(struct vcpu_reg_list *c)
>  			++failed_get;
>  		}
>  
> -		/* rejects_set registers are rejected after KVM_ARM_VCPU_FINALIZE */
> +		/*
> +		 * rejects_set registers are rejected after KVM_ARM_VCPU_FINALIZE on aarch64,
> +		 * or registers that should skip set operation on riscv.
> +		 */
>  		for_each_sublist(c, s) {
>  			if (s->rejects_set && find_reg(s->rejects_set, s->rejects_set_n, reg.id)) {
>  				reject_reg = true;
> -				ret = __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, &reg);
> -				if (ret != -1 || errno != EPERM) {
> -					printf("%s: Failed to reject (ret=%d, errno=%d) ", config_name(c), ret, errno);
> -					print_reg(config_name(c), reg.id);
> -					putchar('\n');
> -					++failed_reject;
> +				if ((reg.id & KVM_REG_ARCH_MASK) == KVM_REG_ARM64) {
> +					ret = __vcpu_ioctl(vcpu, KVM_SET_ONE_REG, &reg);
> +					if (ret != -1 || errno != EPERM) {
> +						printf("%s: Failed to reject (ret=%d, errno=%d) ",
> +								config_name(c), ret, errno);
> +						print_reg(config_name(c), reg.id);
> +						putchar('\n');
> +						++failed_reject;
> +					}

Thinking about this some more, shouldn't we attempt the set ioctl for
riscv reject registers as well, but look for different error numbers?

Thanks,
drew