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[174.95.215.133]) by smtp.gmail.com with ESMTPSA id u11sm1490407qtk.61.2020.10.23.11.34.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 23 Oct 2020 11:34:11 -0700 (PDT) From: Peter Xu To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Sean Christopherson , peterx@redhat.com, Andrew Jones , "Dr . David Alan Gilbert" , Paolo Bonzini Subject: [PATCH v15 08/14] KVM: selftests: Always clear dirty bitmap after iteration Date: Fri, 23 Oct 2020 14:33:52 -0400 Message-Id: <20201023183358.50607-9-peterx@redhat.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201023183358.50607-1-peterx@redhat.com> References: <20201023183358.50607-1-peterx@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org We don't clear the dirty bitmap before because KVM_GET_DIRTY_LOG will clear it for us before copying the dirty log onto it. However we'd still better to clear it explicitly instead of assuming the kernel will always do it for us. More importantly, in the upcoming dirty ring tests we'll start to fetch dirty pages from a ring buffer, so no one is going to clear the dirty bitmap for us. Reviewed-by: Andrew Jones Signed-off-by: Peter Xu --- tools/testing/selftests/kvm/dirty_log_test.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c index 752ec158ac59..6a8275a22861 100644 --- a/tools/testing/selftests/kvm/dirty_log_test.c +++ b/tools/testing/selftests/kvm/dirty_log_test.c @@ -195,7 +195,7 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap) page); } - if (test_bit_le(page, bmap)) { + if (test_and_clear_bit_le(page, bmap)) { host_dirty_count++; /* * If the bit is set, the value written onto -- 2.26.2