linux-kernel - Re: [PATCH] selftests: kvm: make allocation of extra memory take effect

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Date:   Tue, 11 May 2021 21:18:16 +0200
From:   Andrew Jones <drjones@...hat.com>
To:     Zhenzhong Duan <zhenzhong.duan@...el.com>
Cc:     linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        kvm@...r.kernel.org, pbonzini@...hat.com, shuah@...nel.org
Subject: Re: [PATCH] selftests: kvm: make allocation of extra memory take
 effect

On Wed, May 12, 2021 at 12:31:06PM +0800, Zhenzhong Duan wrote:
> The extra memory pages is missed to be allocated during VM creating.
> perf_test_util and kvm_page_table_test use it to alloc extra memory
> currently.
> 
> Fix it by adding extra_mem_pages to the total memory calculation before
> allocate.
> 
> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@...el.com>
> ---
>  tools/testing/selftests/kvm/lib/kvm_util.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index fc83f6c5902d..159f4d62241d 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -295,7 +295,7 @@ struct kvm_vm *vm_create_with_vcpus(enum vm_guest_mode mode, uint32_t nr_vcpus,
>  	 */
>  	uint64_t vcpu_pages = (DEFAULT_STACK_PGS + num_percpu_pages) * nr_vcpus;
>  	uint64_t extra_pg_pages = (extra_mem_pages + vcpu_pages) / PTES_PER_MIN_PAGE * 2;
> -	uint64_t pages = DEFAULT_GUEST_PHY_PAGES + vcpu_pages + extra_pg_pages;
> +	uint64_t pages = DEFAULT_GUEST_PHY_PAGES + extra_mem_pages + vcpu_pages + extra_pg_pages;
>  	struct kvm_vm *vm;
>  	int i;
>  
> -- 
> 2.25.1
>

Reviewed-by: Andrew Jones <drjones@...hat.com>

Thanks,
drew