From patchwork Thu Feb 3 14:23:20 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alexander Graf X-Patchwork-Id: 12734257 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 6804DC433F5 for ; Thu, 3 Feb 2022 14:48:51 +0000 (UTC) Received: from localhost ([::1]:40206 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nFdPm-0000wQ-9m for qemu-devel@archiver.kernel.org; Thu, 03 Feb 2022 09:48:50 -0500 Received: from eggs.gnu.org ([209.51.188.92]:59302) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nFd1I-00028R-Cv; Thu, 03 Feb 2022 09:23:32 -0500 Received: from mail.csgraf.de ([85.25.223.15]:34076 helo=zulu616.server4you.de) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nFd1G-0007FO-EE; Thu, 03 Feb 2022 09:23:32 -0500 Received: from localhost.localdomain (dynamic-095-114-033-227.95.114.pool.telefonica.de [95.114.33.227]) by csgraf.de (Postfix) with ESMTPSA id 39B4F6080DA9; Thu, 3 Feb 2022 15:23:22 +0100 (CET) From: Alexander Graf To: qemu-devel@nongnu.org Subject: [PATCH] hvf: arm: Add simple dirty bitmap tracking Date: Thu, 3 Feb 2022 15:23:20 +0100 Message-Id: <20220203142320.33022-1-agraf@csgraf.de> X-Mailer: git-send-email 2.32.0 (Apple Git-132) MIME-Version: 1.0 Received-SPF: pass client-ip=85.25.223.15; envelope-from=agraf@csgraf.de; helo=zulu616.server4you.de X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Roman Bolshakov , qemu-arm@nongnu.org, Cameron Esfahani Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The actual tracking of dirty bitmap updates is happening in architecture code. So far, the aarch64 hvf code has not updated QEMU's dirty bitmap at all. The net result of that is that the VGA device's framebuffer would not update. This patch adds simplistic dirty bitmap updates. Unfortunately hvf can only set permissions per full region, so we have to mark the complete region as dirty when only a single byte was modified inside. We also handle the write protect update logic before we handle any writes. This allows us to even handle non-ISV instructions on dirty logging enabled memory regions: Once we flip the region to writable again, we just rerun the trapping instruction. Signed-off-by: Alexander Graf --- target/arm/hvf/hvf.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c index 0dc96560d3..92ad0d29c4 100644 --- a/target/arm/hvf/hvf.c +++ b/target/arm/hvf/hvf.c @@ -1163,6 +1163,28 @@ int hvf_vcpu_exec(CPUState *cpu) break; } + /* + * Dirty log updates work without isv as well. We just run the write + * again with write permissions set. So handle them before the assert. + */ + if (iswrite) { + uint64_t gpa = hvf_exit->exception.physical_address; + hvf_slot *slot = hvf_find_overlap_slot(gpa, 1); + + if (slot && slot->flags & HVF_SLOT_LOG) { + /* + * HVF can only set a full region's permissions, so let's just + * mark the full region as dirty. + */ + memory_region_set_dirty(slot->region, 0, slot->size); + hv_vm_protect(slot->start, slot->size, HV_MEMORY_READ | + HV_MEMORY_WRITE | HV_MEMORY_EXEC); + + /* Run the same instruction again, without write faulting */ + break; + } + } + assert(isv); if (iswrite) {