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Message-ID: Date: Wed, 3 May 2023 11:46:11 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.10.1 Subject: [PATCH v2 4/6] VT-d: restrict iommu_flush_all() to cache writeback Content-Language: en-US From: Jan Beulich To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= , Kevin Tian References: In-Reply-To: Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: FR2P281CA0001.DEUP281.PROD.OUTLOOK.COM (2603:10a6:d10:a::11) To AM6PR04MB6551.eurprd04.prod.outlook.com (2603:10a6:20b:fa::20) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: AM6PR04MB6551:EE_|DBBPR04MB7980:EE_ X-MS-Office365-Filtering-Correlation-Id: 7a1238cc-c88c-40f4-e604-08db4bbb3b83 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:AM6PR04MB6551.eurprd04.prod.outlook.com;PTR:;CAT:NONE;SFS:(13230028)(39860400002)(136003)(346002)(376002)(366004)(396003)(451199021)(6506007)(26005)(6512007)(186003)(31686004)(2616005)(4744005)(2906002)(5660300002)(83380400001)(8936002)(8676002)(6486002)(41300700001)(36756003)(478600001)(54906003)(38100700002)(66476007)(66556008)(316002)(31696002)(66946007)(6916009)(4326008)(86362001)(45980500001)(43740500002);DIR:OUT;SFP:1101; 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charset="utf-8" We don't need to invalidate caches here; all we're after is that earlier writes have made it to main memory (and aiui even that just in case). Signed-off-by: Jan Beulich Reviewed-by: Roger Pau Monn=C3=A9 --- This, aiui, being an analogue to uses of iommu_sync_cache() (just not range restricted), I wonder whether it shouldn't be conditional upon iommu_non_coherent. Then again I'm vaguely under the impression that we had been here before, possibly even as far as questioning the need for this call altogether. --- v2: FLUSH_WRITEBACK -> FLUSH_CACHE_WRITEBACK. --- a/xen/drivers/passthrough/vtd/iommu.c +++ b/xen/drivers/passthrough/vtd/iommu.c @@ -693,7 +693,7 @@ static int __must_check iommu_flush_all( bool_t flush_dev_iotlb; int rc =3D 0; =20 - flush_local(FLUSH_CACHE); + flush_local(FLUSH_CACHE_WRITEBACK); =20 for_each_drhd_unit ( drhd ) {