From nobody Sat Sep 21 04:26:26 2024 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; spf=pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) smtp.mailfrom=qemu-devel-bounces+importer=patchew.org@nongnu.org Return-Path: Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) by mx.zohomail.com with SMTPS id 170600585871244.40525566325084; Tue, 23 Jan 2024 02:30:58 -0800 (PST) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1rSE1p-0006vB-4y; Tue, 23 Jan 2024 05:29:13 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rSE1n-0006t2-O2; Tue, 23 Jan 2024 05:29:11 -0500 Received: from isrv.corpit.ru ([86.62.121.231]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1rSE1m-0005Nm-2t; Tue, 23 Jan 2024 05:29:11 -0500 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id AF88C46754; Tue, 23 Jan 2024 13:29:24 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id 4ECEE69AF0; Tue, 23 Jan 2024 13:28:44 +0300 (MSK) Received: (nullmailer pid 3831732 invoked by uid 1000); Tue, 23 Jan 2024 10:28:43 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Mark Cave-Ayland , Guenter Roeck , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Michael Tokarev Subject: [Stable-8.1.5 21/24] hw/scsi/esp-pci: use correct address register for PCI DMA transfers Date: Tue, 23 Jan 2024 13:28:35 +0300 Message-Id: <20240123102843.3831660-10-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=86.62.121.231; envelope-from=mjt@tls.msk.ru; helo=isrv.corpit.ru X-Spam_score_int: -68 X-Spam_score: -6.9 X-Spam_bar: ------ X-Spam_report: (-6.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_HI=-5, 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: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZM-MESSAGEID: 1706005859539100001 From: Mark Cave-Ayland The current code in esp_pci_dma_memory_rw() sets the DMA address to the val= ue of the DMA_SPA (Starting Physical Address) register which is incorrect: this means that for each callback from the SCSI layer the DMA address is set back to the starting address. In the case where only a single SCSI callback occurs (currently for transfer lengths < 128kB) this works fine, however for larger transfers the DMA addr= ess wraps back to the initial starting address, corrupting the buffer holding t= he data transferred to the guest. Fix esp_pci_dma_memory_rw() to use the DMA_WAC (Working Address Counter) for the DMA address which is correctly incremented across multiple SCSI layer transfers. Signed-off-by: Mark Cave-Ayland Reviewed-by: Guenter Roeck Tested-by: Guenter Roeck Message-ID: <20240112131529.515642-2-mark.cave-ayland@ilande.co.uk> Signed-off-by: Philippe Mathieu-Daud=C3=A9 (cherry picked from commit 84a6835e004c257037492167d4f266dbb54dc33e) Signed-off-by: Michael Tokarev diff --git a/hw/scsi/esp-pci.c b/hw/scsi/esp-pci.c index 4e890db0e2..ac5d752876 100644 --- a/hw/scsi/esp-pci.c +++ b/hw/scsi/esp-pci.c @@ -275,7 +275,7 @@ static void esp_pci_dma_memory_rw(PCIESPState *pci, uin= t8_t *buf, int len, qemu_log_mask(LOG_UNIMP, "am53c974: MDL transfer not implemented\n= "); } =20 - addr =3D pci->dma_regs[DMA_SPA]; + addr =3D pci->dma_regs[DMA_WAC]; if (pci->dma_regs[DMA_WBC] < len) { len =3D pci->dma_regs[DMA_WBC]; } --=20 2.39.2