From patchwork Thu Jun 16 10:02:00 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?b?SsO8cmdlbiBHcm/Dnw==?= X-Patchwork-Id: 9180395 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id C967D6075D for ; Thu, 16 Jun 2016 10:03:46 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BC284269A3 for ; Thu, 16 Jun 2016 10:03:46 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id B0C8827F07; Thu, 16 Jun 2016 10:03:46 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from lists.gnu.org (lists.gnu.org [208.118.235.17]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 7E22E269A3 for ; Thu, 16 Jun 2016 10:03:45 +0000 (UTC) Received: from localhost ([::1]:47754 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bDU9I-0002rB-18 for patchwork-qemu-devel@patchwork.kernel.org; Thu, 16 Jun 2016 06:03:44 -0400 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38507) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bDU7z-0001PB-CN for qemu-devel@nongnu.org; Thu, 16 Jun 2016 06:02:24 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1bDU7v-0003Qz-2K for qemu-devel@nongnu.org; Thu, 16 Jun 2016 06:02:22 -0400 Received: from mx2.suse.de ([195.135.220.15]:46403) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1bDU7u-0003Qn-Ql for qemu-devel@nongnu.org; Thu, 16 Jun 2016 06:02:18 -0400 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (charybdis-ext.suse.de [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id CDAA3ACBD; Thu, 16 Jun 2016 10:02:16 +0000 (UTC) From: Juergen Gross To: qemu-devel@nongnu.org, xen-devel@lists.xensource.com Date: Thu, 16 Jun 2016 12:02:00 +0200 Message-Id: <1466071320-10964-1-git-send-email-jgross@suse.com> X-Mailer: git-send-email 2.6.6 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic] X-Received-From: 195.135.220.15 Subject: [Qemu-devel] [PATCH] xen: fix qdisk BLKIF_OP_DISCARD for 32/64 word size mix X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: anthony.perard@citrix.com, Juergen Gross , sstabellini@kernel.org, kraxel@redhat.com Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP In case the word size of the domU and qemu running the qdisk backend differ BLKIF_OP_DISCARD will not work reliably, as the request structure in the ring have different layouts for different word size. Correct this by copying the request structure in case of different word size element by element in the BLKIF_OP_DISCARD case, too. Signed-off-by: Juergen Gross Reviewed-by: Jan Beulich --- hw/block/xen_blkif.h | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) diff --git a/hw/block/xen_blkif.h b/hw/block/xen_blkif.h index e3b133b..969112f 100644 --- a/hw/block/xen_blkif.h +++ b/hw/block/xen_blkif.h @@ -26,6 +26,14 @@ struct blkif_x86_32_request { blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; }; +struct blkif_x86_32_request_discard { + uint8_t operation; /* BLKIF_OP_DISCARD */ + uint8_t flag; /* nr_segments in request struct */ + blkif_vdev_t handle; /* only for read/write requests */ + uint64_t id; /* private guest value, echoed in resp */ + blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ + uint64_t nr_sectors; /* # of contiguous sectors to discard */ +}; struct blkif_x86_32_response { uint64_t id; /* copied from request */ uint8_t operation; /* copied from request */ @@ -44,6 +52,14 @@ struct blkif_x86_64_request { blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST]; }; +struct blkif_x86_64_request_discard { + uint8_t operation; /* BLKIF_OP_DISCARD */ + uint8_t flag; /* nr_segments in request struct */ + blkif_vdev_t handle; /* only for read/write requests */ + uint64_t __attribute__((__aligned__(8))) id; + blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */ + uint64_t nr_sectors; /* # of contiguous sectors to discard */ +}; struct blkif_x86_64_response { uint64_t __attribute__((__aligned__(8))) id; uint8_t operation; /* copied from request */ @@ -82,7 +98,7 @@ static inline void blkif_get_x86_32_req(blkif_request_t *dst, blkif_x86_32_reque /* Prevent the compiler from using src->... instead. */ barrier(); if (dst->operation == BLKIF_OP_DISCARD) { - struct blkif_request_discard *s = (void *)src; + struct blkif_x86_32_request_discard *s = (void *)src; struct blkif_request_discard *d = (void *)dst; d->nr_sectors = s->nr_sectors; return; @@ -105,7 +121,7 @@ static inline void blkif_get_x86_64_req(blkif_request_t *dst, blkif_x86_64_reque /* Prevent the compiler from using src->... instead. */ barrier(); if (dst->operation == BLKIF_OP_DISCARD) { - struct blkif_request_discard *s = (void *)src; + struct blkif_x86_64_request_discard *s = (void *)src; struct blkif_request_discard *d = (void *)dst; d->nr_sectors = s->nr_sectors; return;