linux-kernel - Re: [PATCH 2/2] KVM: selftests: Enable dirty_log

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Date:   Tue, 30 Jul 2019 13:35:21 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Thomas Huth <thuth@...hat.com>, kvm@...r.kernel.org,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>
Cc:     linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org, David Hildenbrand <david@...hat.com>,
        Cornelia Huck <cohuck@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Shuah Khan <shuah@...nel.org>, Peter Xu <peterx@...hat.com>
Subject: Re: [PATCH 2/2] KVM: selftests: Enable dirty_log_test on s390x

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