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helo=lists.xenproject.org; Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB03.amd.com; pr=C From: Stewart Hildebrand To: CC: Oleksandr Andrushchenko , =?UTF-8?q?Roger=20Pau=20Monn=C3=A9?= , "Volodymyr Babchuk" , Stewart Hildebrand Subject: [PATCH v12 02/15] vpci: restrict unhandled read/write operations for guests Date: Tue, 9 Jan 2024 16:51:17 -0500 Message-ID: <20240109215145.430207-3-stewart.hildebrand@amd.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240109215145.430207-1-stewart.hildebrand@amd.com> References: <20240109215145.430207-1-stewart.hildebrand@amd.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SJ1PEPF00001CE4:EE_|PH0PR12MB8049:EE_ X-MS-Office365-Filtering-Correlation-Id: ea1f000d-31b2-46cc-7f96-08dc115d40ec X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 09 Jan 2024 21:52:19.7545 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: ea1f000d-31b2-46cc-7f96-08dc115d40ec X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB03.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SJ1PEPF00001CE4.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH0PR12MB8049 X-ZohoMail-DKIM: pass (identity @amd.com) X-ZM-MESSAGEID: 1704837158787100005 From: Oleksandr Andrushchenko A guest would be able to read and write those registers which are not emulated and have no respective vPCI handlers, so it will be possible for it to access the hardware directly. In order to prevent a guest from reads and writes from/to the unhandled registers make sure only hardware domain can access the hardware directly and restrict guests from doing so. Suggested-by: Roger Pau Monn=C3=A9 Signed-off-by: Oleksandr Andrushchenko Signed-off-by: Volodymyr Babchuk Reviewed-by: Roger Pau Monn=C3=A9 Signed-off-by: Stewart Hildebrand --- Since v9: - removed stray formatting change - added Roger's R-b tag Since v6: - do not use is_hwdom parameter for vpci_{read|write}_hw and use current->domain internally - update commit message New in v6 --- xen/drivers/vpci/vpci.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/xen/drivers/vpci/vpci.c b/xen/drivers/vpci/vpci.c index a1a004460491..e98693e1dc3e 100644 --- a/xen/drivers/vpci/vpci.c +++ b/xen/drivers/vpci/vpci.c @@ -268,6 +268,10 @@ static uint32_t vpci_read_hw(pci_sbdf_t sbdf, unsigned= int reg, { uint32_t data; =20 + /* Guest domains are not allowed to read real hardware. */ + if ( !is_hardware_domain(current->domain) ) + return ~(uint32_t)0; + switch ( size ) { case 4: @@ -311,6 +315,10 @@ static uint32_t vpci_read_hw(pci_sbdf_t sbdf, unsigned= int reg, static void vpci_write_hw(pci_sbdf_t sbdf, unsigned int reg, unsigned int = size, uint32_t data) { + /* Guest domains are not allowed to write real hardware. */ + if ( !is_hardware_domain(current->domain) ) + return; + switch ( size ) { case 4: --=20 2.43.0