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received-spf: None (protection.outlook.com: microsoft.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: axwHO+ltufopO9ioJ6aZI2AQY4XuQ0UJn+egXmLw9pclCJLPODfMU68hxLZ3N17q7ckVQABRUk7m+nffmsEakAIal+J4Stkwqd2IFXwW2VhHWBMDSooozqcnWswL1pHa0RYd8DstscDZN3Ud+UNVG4OceL1hHI83DfDFzN5fa1+PggMf/u7SxZVTS4CwqZE6wwVQwgmBx+EzZE+AdCIMDcH8jyXUZHGS+fsUO8DFT4EiMLfO2Kr2PsW20xs4/WJzu4734mxajuDN6mbZvdAihiAkOxFBcvj2SAH5SzVoNj51ksb6q28LhUcmUVVVPmeG/8RxaDcY5qPehZbJGoOOrjJ7LV5dUYhwgQFOwMu3LJXngt6MR795RmIhj2dYuaHnw8C3cYDenerax3sEwahbde57RfOx5IPil7FJCjV5nak= Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: microsoft.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3c0f7156-b776-46a7-e101-08d72242b05a X-MS-Exchange-CrossTenant-originalarrivaltime: 16 Aug 2019 12:10:11.7080 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 72f988bf-86f1-41af-91ab-2d7cd011db47 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: KguNFS2FknB19sckN/UkMDCQfoxBIAUzYv1XkBLWpue/GsXR3PYxMY3zDLAcDsXPaPp+GDFq4FOfOefB82SJsQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM6PR21MB1306 Sender: linux-hyperv-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-hyperv@vger.kernel.org > -----Original Message----- > From: Lorenzo Pieralisi > Sent: Friday, August 16, 2019 5:52 AM > To: Haiyang Zhang > Cc: sashal@kernel.org; bhelgaas@google.com; linux- > hyperv@vger.kernel.org; linux-pci@vger.kernel.org; KY Srinivasan > ; Stephen Hemminger ; > olaf@aepfle.de; vkuznets ; linux- > kernel@vger.kernel.org > Subject: Re: [PATCH v6,1/2] PCI: hv: Detect and fix Hyper-V PCI domain > number collision >=20 > On Thu, Aug 15, 2019 at 05:01:37PM +0000, Haiyang Zhang wrote: > > Currently in Azure cloud, for passthrough devices, the host sets the > > device instance ID's bytes 8 - 15 to a value derived from the host > > HWID, which is the same on all devices in a VM. So, the device > > instance ID's bytes 8 and 9 provided by the host are no longer unique. > > This affects all Azure hosts since July 2018, and can cause device > > passthrough to VMs to fail because the bytes 8 and 9 are used as PCI > > domain number. Collision of domain numbers will cause the second > > device with the same domain number fail to load. > > > > In the cases of collision, we will detect and find another number that > > is not in use. > > > > Suggested-by: Michael Kelley > > Signed-off-by: Haiyang Zhang > > Acked-by: Sasha Levin >=20 > I assume you will take care of backporting and sending this patch to stab= le > kernels given that you have not applied any tag with such request. >=20 > I appreciate it may not be easy to define but a Fixes: tag would help. Sure, I will add a Fixes tag, and Cc stable. Usually Sasha from our team wi= ll do the stable porting in batches. Thanks, - Haiyang