linux-kernel - Re: [PATCH] KVM: x86: selftests: svm_int_ctl

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Date:   Fri, 03 Dec 2021 09:36:09 +0200
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     "Maciej S. Szmigiero" <mail@...iej.szmigiero.name>,
        Paolo Bonzini <pbonzini@...hat.com>
Cc:     Shuah Khan <shuah@...nel.org>, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] KVM: x86: selftests: svm_int_ctl_test: fix intercept
 calculation

On Fri, 2021-12-03 at 00:10 +0100, Maciej S. Szmigiero wrote:
> From: "Maciej S. Szmigiero" <maciej.szmigiero@...cle.com>
> 
> INTERCEPT_x are bit positions, but the code was using the raw value of
> INTERCEPT_VINTR (4) instead of BIT(INTERCEPT_VINTR).
> This resulted in masking of bit 2 - that is, SMI instead of VINTR.
> 
> Signed-off-by: Maciej S. Szmigiero <maciej.szmigiero@...cle.com>
> ---
>  tools/testing/selftests/kvm/x86_64/svm_int_ctl_test.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/x86_64/svm_int_ctl_test.c b/tools/testing/selftests/kvm/x86_64/svm_int_ctl_test.c
> index df04f56ce859..30a81038df46 100644
> --- a/tools/testing/selftests/kvm/x86_64/svm_int_ctl_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/svm_int_ctl_test.c
> @@ -75,7 +75,7 @@ static void l1_guest_code(struct svm_test_data *svm)
>  	vmcb->control.int_ctl &= ~V_INTR_MASKING_MASK;
>  
>  	/* No intercepts for real and virtual interrupts */
> -	vmcb->control.intercept &= ~(1ULL << INTERCEPT_INTR | INTERCEPT_VINTR);
> +	vmcb->control.intercept &= ~(BIT(INTERCEPT_INTR) | BIT(INTERCEPT_VINTR));
>  
>  	/* Make a virtual interrupt VINTR_IRQ_NUMBER pending */
>  	vmcb->control.int_ctl |= V_IRQ_MASK | (0x1 << V_INTR_PRIO_SHIFT);
> 
Sorry about that.
Reviewed-by: Maxim Levitsky <mlevitsk@...hat.com>

Best regards,
	Maxim Levitsky