From patchwork Mon Jul 15 05:52:46 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Michael Tokarev X-Patchwork-Id: 13732916 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 1AD4AC2BD09 for ; Mon, 15 Jul 2024 05:54:20 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1sTEe0-0001wh-Uz; Mon, 15 Jul 2024 01:53:05 -0400 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 1sTEdx-0001pK-NH; Mon, 15 Jul 2024 01:53:02 -0400 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 1sTEdu-00078f-R7; Mon, 15 Jul 2024 01:53:01 -0400 Received: from tsrv.corpit.ru (tsrv.tls.msk.ru [192.168.177.2]) by isrv.corpit.ru (Postfix) with ESMTP id AC8667A3CF; Mon, 15 Jul 2024 08:52:47 +0300 (MSK) Received: from tls.msk.ru (mjt.wg.tls.msk.ru [192.168.177.130]) by tsrv.corpit.ru (Postfix) with SMTP id B0786108AB3; Mon, 15 Jul 2024 08:52:48 +0300 (MSK) Received: (nullmailer pid 564526 invoked by uid 1000); Mon, 15 Jul 2024 05:52:48 -0000 From: Michael Tokarev To: qemu-devel@nongnu.org Cc: qemu-stable@nongnu.org, Stefano Garzarella , jasowang@redhat.com, Xoykie , Peter Maydell , =?utf-8?q?Eugenio_P=C3=A9rez?= , "Michael S . Tsirkin" , Michael Tokarev Subject: [Stable-7.2.13 18/19] virtio: remove virtio_tswap16s() call in vring_packed_event_read() Date: Mon, 15 Jul 2024 08:52:46 +0300 Message-Id: <20240715055248.564504-1-mjt@tls.msk.ru> X-Mailer: git-send-email 2.39.2 In-Reply-To: References: MIME-Version: 1.0 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 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Stefano Garzarella Commit d152cdd6f6 ("virtio: use virtio accessor to access packed event") switched using of address_space_read_cached() to virito_lduw_phys_cached() to access packed descriptor event. When we used address_space_read_cached(), we needed to call virtio_tswap16s() to handle the endianess of the field, but virito_lduw_phys_cached() already handles it internally, so we no longer need to call virtio_tswap16s() (as the commit had done for `off_wrap`, but forgot for `flags`). Fixes: d152cdd6f6 ("virtio: use virtio accessor to access packed event") Cc: jasowang@redhat.com Cc: qemu-stable@nongnu.org Reported-by: Xoykie Link: https://lore.kernel.org/qemu-devel/CAFU8RB_pjr77zMLsM0Unf9xPNxfr_--Tjr49F_eX32ZBc5o2zQ@mail.gmail.com Signed-off-by: Stefano Garzarella Message-Id: <20240701075208.19634-1-sgarzare@redhat.com> Acked-by: Jason Wang Reviewed-by: Peter Maydell Reviewed-by: Eugenio Pérez Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin (cherry picked from commit 7aa6492401e95fb296dec7cda81e67d91f6037d7) Signed-off-by: Michael Tokarev diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 4a35d7cb0c..1227e3d692 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -732,7 +732,6 @@ static void vring_packed_event_read(VirtIODevice *vdev, /* Make sure flags is seen before off_wrap */ smp_rmb(); e->off_wrap = virtio_lduw_phys_cached(vdev, cache, off_off); - virtio_tswap16s(vdev, &e->flags); } static void vring_packed_off_wrap_write(VirtIODevice *vdev,