From patchwork Sat Dec 14 01:07:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 13908239 Received: from mail-pf1-f202.google.com (mail-pf1-f202.google.com [209.85.210.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4E37B1422AB for ; Sat, 14 Dec 2024 01:07:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734138456; cv=none; b=r/phwRRGKNqpzYwh8JIqVcGjhFltZIp0+qcf70uSP17mcrdmt7px+6Vr7d4EbQ8Do2wlRoV8LbIdE3KBEK2M0ANGZcqiA4uYw+CvQo+l4rkQHUZkJqTAnbZhcG3Tdsv0bi+WqPMt09xyy1ZeN1a28OiUW87uNblCD7v+gWWbS7c= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734138456; c=relaxed/simple; bh=ChtkTwOdtM2CUHYRr5Q44jb7j5O7SxNDxq57Jgyawzk=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=n840d4vseCxtH3r/SIWpjeObCNQaNio/l0Hii4CyisCwdbz5hTPZVINrpXpMQr7we//aP4PbzrS8VSL/G9+MeWS1QD6PUqUdgWBFR2+8GseG3i6Ve2bE9QAp+9Bwd/BWAoFfGznbD+P5jxoajzgCr4VntuFoBPf26cEpF622sRI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=V2SqFCBt; arc=none smtp.client-ip=209.85.210.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--seanjc.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="V2SqFCBt" Received: by mail-pf1-f202.google.com with SMTP id d2e1a72fcca58-728e3ae8112so1833250b3a.0 for ; Fri, 13 Dec 2024 17:07:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1734138455; x=1734743255; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:from:to:cc:subject:date:message-id:reply-to; bh=S4Qc03cR1N5CABN65ZcLjYJSL9LWVrIe/DGU28OwxCc=; b=V2SqFCBtzIxBdTqHO8ImQFRE5+NsddNwO2H2wfS1CjEGjwL01pILZi7MRwO2o1c3Bl Ydr0m2GKyoaRNe6IHwGKBFG52FTkB+ZEgSb41jv4NCgoStPZ3tFe/noMiM4Dr8YLWZyH /h5wvlMe/MIDncF7BNdsuIvsX3Gu699Ow3OCd5Aj/UeFRdgrNWQMjVXBKUmwFEMj2mKG OmpyCq92X3ZMYDMrYkryH0M4crk6pI7uqkGOf7NpplfONKoqBfbYmeIH/yGc8I8CumOL Jv1OYGHhjh2M9EQYohESuQ+Sgcj6iHJm1ynQbsXINd8cpE9l6owi+2w6HNB3B3SewsCg fzZw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1734138455; x=1734743255; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:reply-to:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=S4Qc03cR1N5CABN65ZcLjYJSL9LWVrIe/DGU28OwxCc=; b=Dt9FigV/7hTqs22rXq/tSUWCh3ekRiC+k5O4x25M2gEJs91zgOuJRPdL54V6mtEWhh gtabetxbooajXg9SsZ4HYixcvfA99IUcOGVdzJ14hMsZRe0xMyfBqXuNxlhMOOGZrKIt nfHura5hOTjPiX4/KHSxfeCoOsqwnuM+DmIWOQQATnTROlXj4ZuQBEVT+lAESjJir2UH 3cFzX9ljCt/aXeCLeJLIE7FJAOe8MJ7ekhkg6gQpvIS+3uL1ROHclZfyJ7L9lmuEamRo WxIAC/LqQ0d2IMEx4KzD/x9LtH1furzxqKzltWL1MDVRQFYoj8gJo5ZY88c1a6n8Gy1d o+cA== X-Gm-Message-State: AOJu0YzNzicQLBQ1E49trum66yA9KEJ/0Zi5dFckKfJjQ1ulZkvrQAIq AR7/Ex9xCBmeIRoplGhYXM2pTAHhQ8MgIwuCvH/83wlXQOej1/J/ry2BiWVBvduFMkOxlsCmSMc rzw== X-Google-Smtp-Source: AGHT+IG76QYly7Ply8m0CQfOF1OiirHYULNiCeYsTc6x5fGj00WXQFhcZFDKzqpfuelhdSo8iO789Lb6YjM= X-Received: from pffk21.prod.google.com ([2002:aa7:88d5:0:b0:725:f376:f548]) (user=seanjc job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a00:430f:b0:724:f8d4:2b6e with SMTP id d2e1a72fcca58-7290c0fcdadmr6078557b3a.4.1734138454729; Fri, 13 Dec 2024 17:07:34 -0800 (PST) Reply-To: Sean Christopherson Date: Fri, 13 Dec 2024 17:07:07 -0800 In-Reply-To: <20241214010721.2356923-1-seanjc@google.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241214010721.2356923-1-seanjc@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241214010721.2356923-7-seanjc@google.com> Subject: [PATCH 06/20] KVM: selftests: Read per-page value into local var when verifying dirty_log_test From: Sean Christopherson To: Paolo Bonzini Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Peter Xu , Maxim Levitsky , Sean Christopherson Cache the page's value during verification in a local variable, re-reading from the pointer is ugly and error prone, e.g. allows for bugs like checking the pointer itself instead of the value. Signed-off-by: Sean Christopherson Reviewed-by: Maxim Levitsky --- tools/testing/selftests/kvm/dirty_log_test.c | 16 +++++++--------- 1 file changed, 7 insertions(+), 9 deletions(-) diff --git a/tools/testing/selftests/kvm/dirty_log_test.c b/tools/testing/selftests/kvm/dirty_log_test.c index 08cbecd1a135..5a04a7bd73e0 100644 --- a/tools/testing/selftests/kvm/dirty_log_test.c +++ b/tools/testing/selftests/kvm/dirty_log_test.c @@ -520,11 +520,10 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap) { uint64_t page, nr_dirty_pages = 0, nr_clean_pages = 0; uint64_t step = vm_num_host_pages(mode, 1); - uint64_t *value_ptr; uint64_t min_iter = 0; for (page = 0; page < host_num_pages; page += step) { - value_ptr = host_test_mem + page * host_page_size; + uint64_t val = *(uint64_t *)(host_test_mem + page * host_page_size); /* If this is a special page that we were tracking... */ if (__test_and_clear_bit_le(page, host_bmap_track)) { @@ -545,11 +544,10 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap) * the corresponding page should be either the * previous iteration number or the current one. */ - matched = (*value_ptr == iteration || - *value_ptr == iteration - 1); + matched = (val == iteration || val == iteration - 1); if (host_log_mode == LOG_MODE_DIRTY_RING && !matched) { - if (*value_ptr == iteration - 2 && min_iter <= iteration - 2) { + if (val == iteration - 2 && min_iter <= iteration - 2) { /* * Short answer: this case is special * only for dirty ring test where the @@ -597,7 +595,7 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap) TEST_ASSERT(matched, "Set page %"PRIu64" value %"PRIu64 " incorrect (iteration=%"PRIu64")", - page, *value_ptr, iteration); + page, val, iteration); } else { nr_clean_pages++; /* @@ -619,11 +617,11 @@ static void vm_dirty_log_verify(enum vm_guest_mode mode, unsigned long *bmap) * we'll see that page P is cleared, with * value "iteration-1". */ - TEST_ASSERT(*value_ptr <= iteration, + TEST_ASSERT(val <= iteration, "Clear page %"PRIu64" value %"PRIu64 " incorrect (iteration=%"PRIu64")", - page, *value_ptr, iteration); - if (*value_ptr == iteration) { + page, val, iteration); + if (val == iteration) { /* * This page is _just_ modified; it * should report its dirtyness in the