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20:g4EMAya4pg54V4fIOl76vwI/MjnkRfoHe1+qh0KbiQeQRoMzp5MQKD+eBVDxypDwL1V327ZCgrm8QbN1XMZBGQPK/3zHML8q6QnIJuHNiZQO8fYoaPIzSuKJRzBcVswTVBC6L+DtTkfuwfkpt/caTuVUEeQVHfsz2MI1eOEAmy3oQETW8NqwItKCfEKR5GXMHVE3hOEL0WEGat18lQL6vThsLD9GVMUX1HsCSKWDlL7fvYaEXhuFE1yG2/p7CfmX X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 26 May 2017 14:44:31.5839 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN1PR12MB0158 Subject: [edk2] [PATCH v6 07/17] OvmfPkg: Introduce IoMmuAbsent Protocol GUID X-BeenThere: edk2-devel@lists.01.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: EDK II Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Thomas.Lendacky@amd.com, leo.duran@amd.com, Laszlo Ersek , Jordan Justen Content-Transfer-Encoding: quoted-printable Errors-To: edk2-devel-bounces@lists.01.org Sender: "edk2-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) X-ZohoMail: RDKM_2 RSF_4 Z_629925259 SPT_0 Content-Type: text/plain; charset="utf-8" Platforms that optionally provide an IOMMU protocol should do so by including a DXE driver (usually called IoMmuDxe) that produces either the IOMMU protocol -- if the underlying capabilities are available --, or gIoMmuAbsentProtocolGuid, to signal that the IOMMU capability detection completed with negative result (i.e., no IOMMU will be available in the system). In turn, DXE drivers (and library instances) that are supposed to use the IOMMU protocol if it is available should add the following to their DEPEX: gEdkiiIoMmuProtocolGuid OR gIoMmuAbsentProtocolGuid This ensures these client modules will only be dispatched after IOMMU detection completes (with positive or negative result). Cc: Jordan Justen Cc: Laszlo Ersek Cc: Leo Duran Contributed-under: TianoCore Contribution Agreement 1.0 Suggested-by: Jordan Justen Suggested-by: Laszlo Ersek Signed-off-by: Brijesh Singh Reviewed-by: Laszlo Ersek --- OvmfPkg/OvmfPkg.dec | 1 + 1 file changed, 1 insertion(+) diff --git a/OvmfPkg/OvmfPkg.dec b/OvmfPkg/OvmfPkg.dec index 5627be0bab0a..4241af10c3d0 100644 --- a/OvmfPkg/OvmfPkg.dec +++ b/OvmfPkg/OvmfPkg.dec @@ -69,6 +69,7 @@ [Protocols] gBlockMmioProtocolGuid =3D {0x6b558ce3, 0x69e5, 0x4c67, {0x= a6, 0x34, 0xf7, 0xfe, 0x72, 0xad, 0xbe, 0x84}} gXenBusProtocolGuid =3D {0x3d3ca290, 0xb9a5, 0x11e3, {0x= b7, 0x5d, 0xb8, 0xac, 0x6f, 0x7d, 0x65, 0xe6}} gXenIoProtocolGuid =3D {0x6efac84f, 0x0ab0, 0x4747, {0x= 81, 0xbe, 0x85, 0x55, 0x62, 0x59, 0x04, 0x49}} + gIoMmuAbsentProtocolGuid =3D {0xf8775d50, 0x8abd, 0x4adf, {0x= 92, 0xac, 0x85, 0x3e, 0x51, 0xf6, 0xc8, 0xdc}} =20 [PcdsFixedAtBuild] gUefiOvmfPkgTokenSpaceGuid.PcdOvmfPeiMemFvBase|0x0|UINT32|0 --=20 2.7.4 _______________________________________________ edk2-devel mailing list edk2-devel@lists.01.org https://lists.01.org/mailman/listinfo/edk2-devel