Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Subject: Re: [PATCH 2/2] KVM: selftests: Enable dirty_log_test on s390x
To:     Thomas Huth <thuth@redhat.com>, kvm@vger.kernel.org,
        Christian Borntraeger <borntraeger@de.ibm.com>,
        Janosch Frank <frankja@linux.ibm.com>
Cc:     linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-s390@vger.kernel.org, David Hildenbrand <david@redhat.com>,
        Cornelia Huck <cohuck@redhat.com>,
        =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= <rkrcmar@redhat.com>,
        Shuah Khan <shuah@kernel.org>, Peter Xu <peterx@redhat.com>
References: <20190730100112.18205-1-thuth@redhat.com>
 <20190730100112.18205-3-thuth@redhat.com>
From:   Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <3092bab6-8ab9-c404-a5bb-64ca89eccd12@redhat.com>
Date:   Tue, 30 Jul 2019 13:35:21 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101
 Thunderbird/60.8.0
MIME-Version: 1.0
In-Reply-To: <20190730100112.18205-3-thuth@redhat.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On 30/07/19 12:01, Thomas Huth wrote:
> +#ifdef __s390x__
> +	/*
> +	 * On s390x, all pages of a 1M segment are initially marked as dirty
> +	 * when a page of the segment is written to for the very first time.
> +	 * To compensate this specialty in this test, we need to touch all
> +	 * pages during the first iteration.
> +	 */
> +	for (i = 0; i < guest_num_pages; i++) {
> +		addr = guest_test_virt_mem + i * guest_page_size;
> +		*(uint64_t *)addr = READ_ONCE(iteration);
> +	}
> +#endif

Go ahead and make this unconditional.

Paolo