linux-kernel - Re: [PATCH] selftests/kvm: Use num_vcpus when testing ICR in the xapic_state

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Message-ID: <YyCtfu8zvvTKKs1u@biggie>
Date:   Tue, 13 Sep 2022 21:49:10 +0530
From:   Gautam Menghani <gautammenghani201@...il.com>
To:     pbonzini@...hat.com, shuah@...nel.org
Cc:     seanjc@...gle.com, guang.zeng@...el.com, kvm@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        skhan@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org
Subject: Re: [PATCH] selftests/kvm: Use num_vcpus when testing ICR in the
 xapic_state_test

On Sat, Sep 03, 2022 at 01:09:01PM +0530, Gautam Menghani wrote:
> A TODO in xapic_state_test asks to use number of vCPUs instead of
> vcpu.id + 1 in test_icr(). This patch adds support to get the number 
> of vCPUs from the VM created and use it.
> 
> Signed-off-by: Gautam Menghani <gautammenghani201@...il.com>
> ---
>  .../selftests/kvm/x86_64/xapic_state_test.c     | 17 ++++++++++-------
>  1 file changed, 10 insertions(+), 7 deletions(-)
> 
> diff --git a/tools/testing/selftests/kvm/x86_64/xapic_state_test.c b/tools/testing/selftests/kvm/x86_64/xapic_state_test.c
> index 6f7a5ef66718..de934e8e5e41 100644
> --- a/tools/testing/selftests/kvm/x86_64/xapic_state_test.c
> +++ b/tools/testing/selftests/kvm/x86_64/xapic_state_test.c
> @@ -96,9 +96,8 @@ static void __test_icr(struct xapic_vcpu *x, uint64_t val)
>  	____test_icr(x, val & ~(u64)APIC_ICR_BUSY);
>  }
>  
> -static void test_icr(struct xapic_vcpu *x)
> +static void test_icr(struct xapic_vcpu *x, int num_vcpus)
>  {
> -	struct kvm_vcpu *vcpu = x->vcpu;
>  	uint64_t icr, i, j;
>  
>  	icr = APIC_DEST_SELF | APIC_INT_ASSERT | APIC_DM_FIXED;
> @@ -110,11 +109,11 @@ static void test_icr(struct xapic_vcpu *x)
>  		__test_icr(x, icr | i);
>  
>  	/*
> -	 * Send all flavors of IPIs to non-existent vCPUs.  TODO: use number of
> -	 * vCPUs, not vcpu.id + 1.  Arbitrarily use vector 0xff.
> +	 * Send all flavors of IPIs to non-existent vCPUs. Arbitrarily use vector 0xff.
>  	 */
> +
>  	icr = APIC_INT_ASSERT | 0xff;
> -	for (i = vcpu->id + 1; i < 0xff; i++) {
> +	for (i = num_vcpus; i < 0xff; i++) {
>  		for (j = 0; j < 8; j++)
>  			__test_icr(x, i << (32 + 24) | icr | (j << 8));
>  	}
> @@ -137,9 +136,13 @@ int main(int argc, char *argv[])
>  		.is_x2apic = true,
>  	};
>  	struct kvm_vm *vm;
> +	struct list_head *iter;
> +	int nr_vcpus_created = 0;
>  
>  	vm = vm_create_with_one_vcpu(&x.vcpu, x2apic_guest_code);
> -	test_icr(&x);
> +	list_for_each(iter, &vm->vcpus)
> +		nr_vcpus_created++;
> +	test_icr(&x, nr_vcpus_created);
>  	kvm_vm_free(vm);
>  
>  	/*
> @@ -153,6 +156,6 @@ int main(int argc, char *argv[])
>  	vcpu_clear_cpuid_feature(x.vcpu, X86_FEATURE_X2APIC);
>  
>  	virt_pg_map(vm, APIC_DEFAULT_GPA, APIC_DEFAULT_GPA);
> -	test_icr(&x);
> +	test_icr(&x, nr_vcpus_created);
>  	kvm_vm_free(vm);
>  }
> -- 
> 2.34.1
> 

Hi,

Please review the above patch and let me know if any change is required.

Thanks,
Gautam