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mx.microsoft.com 1; spf=pass smtp.mailfrom=citrix.com; dmarc=pass action=none header.from=citrix.com; dkim=pass header.d=citrix.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=citrix.onmicrosoft.com; s=selector2-citrix-onmicrosoft-com; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=dQGcGIWw8+ykgU2xoO+AYLGk6aYorzQ1pON8+RmWEuE=; b=nDxvXe3ViPT6lSj2a8b3p0o6a2ERteZcxlfy28FnyHpobgZf3yvGBTQDORTW7pI3RVYGsu8/I2WhuEvtyl+Zx23NdroMdKNEV9C3g3zMOxeQB1Y7xmB//iUjjlqh2RNnAnprXEx01nwlKm/jYKeFHrQkg7lKnCkGfuRYZZcSMII= From: Roger Pau Monne To: CC: Roger Pau Monne , Wei Liu , Ian Jackson Subject: [PATCH for-4.16] freebsd/privcmd: fix MMAP_RESOURCE ioctl definition Date: Mon, 15 Nov 2021 12:08:51 +0100 Message-ID: <20211115110851.1462-1-roger.pau@citrix.com> X-Mailer: git-send-email 2.33.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: MR2P264CA0086.FRAP264.PROD.OUTLOOK.COM (2603:10a6:500:32::26) To DS7PR03MB5608.namprd03.prod.outlook.com (2603:10b6:5:2c9::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 5c524cd3-36bc-42c5-847a-08d9a8285145 X-MS-TrafficTypeDiagnostic: DM6PR03MB4220: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:9508; 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FreeBSD encodes in the definition of the ioctl number whether parameters should be copied in (W) and/or copied out (R). The current definition for MMAP_RESOURCE is lacking the copy out part (R), and thus the call to query the size of a resource would always return 0. This change will break the current ioctl interface, the tools can however fall back to using the foreign memory interface in order to map resources from guests. This was a shortcoming from when the hypercall and ioctl gained the ability to query the size of the resources, as originally the MMAP_RESOURCE ioctl didn't need to copy out any data. Signed-off-by: Roger Pau Monn=C3=A9 --- Cc: Ian Jackson The change only affects FreeBSD, and it's only a change in a definition of an ioctl, so it's unlikely to break existing code logic. Without this change Xen tools won't be able to use the MMAP_RESOURCE ioctl. --- tools/include/xen-sys/FreeBSD/privcmd.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/include/xen-sys/FreeBSD/privcmd.h b/tools/include/xen-sy= s/FreeBSD/privcmd.h index 649ad443c7..70cee3db68 100644 --- a/tools/include/xen-sys/FreeBSD/privcmd.h +++ b/tools/include/xen-sys/FreeBSD/privcmd.h @@ -84,7 +84,7 @@ typedef struct ioctl_privcmd_dmop privcmd_dm_op_t; #define IOCTL_PRIVCMD_MMAPBATCH \ _IOWR('E', 1, struct ioctl_privcmd_mmapbatch) #define IOCTL_PRIVCMD_MMAP_RESOURCE \ - _IOW('E', 2, struct ioctl_privcmd_mmapresource) + _IOWR('E', 2, struct ioctl_privcmd_mmapresource) #define IOCTL_PRIVCMD_DM_OP \ _IOW('E', 3, struct ioctl_privcmd_dmop) #define IOCTL_PRIVCMD_RESTRICT \ --=20 2.33.0