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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: gjjz5L/snRKU+A7tpynBMbCByLwZViRsZAl8U2/+/l9HPQ+ZYAR8hgAhRLK/ydtVDt+L/O4JmW/whRTcv1Yvfb+eARULeoPxDpuiH4wVDp73DDtH15a/JrDvLx9jEfAid0zWNVvxE3A8KbxKUTu27/OGY8aWZYeEerXKCt1f36WxJoibTV1e9wCFVHtGJKToIGrQEHvUWbZAP2mBQQT8DvGyoCMPHmZGsmiTASUEqqiWaFV8ZM6n7grlL6kZYcnVIS3uyfS2FicGkxqfHUxqSr4fp0l/aQ1FpSq7Ce0pVGzx09L53q0DJI8LREjT7FhOOipb5NcoOhV3R5XXQg4NsZjRZNPhDMeA+uRgEFEszR4OpPvt4GBvatP5NQiTNb95EgODGf2Pu8Ox+vDfSXw081kWKwCXuFR/AXAEKBj7m9/wXmfFT8na6aM5dBUBlsdz X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Apr 2026 16:21:20.0577 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 84c16ada-b178-4216-11e4-08dea4790431 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: AM4PEPF00027A65.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAWPR08MB9006 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260427_092125_908904_DFBAA48B X-CRM114-Status: GOOD ( 10.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add documentation for the KVM_DEV_ARM_VGIC_GRP_IRS_REGS ioctl used to read/write the virtual IRS's MMIO register state. This is the same interface as is already present for handling a VGICv3's ITS, but hiding behind a different, more appropriately named ioctl (that doesn't contain ITS, but instead contains IRS). Signed-off-by: Sascha Bischoff --- .../virt/kvm/devices/arm-vgic-v5.rst | 31 +++++++++++++++++++ 1 file changed, 31 insertions(+) diff --git a/Documentation/virt/kvm/devices/arm-vgic-v5.rst b/Documentation= /virt/kvm/devices/arm-vgic-v5.rst index 46ede907f2b32..9fc6afe16154a 100644 --- a/Documentation/virt/kvm/devices/arm-vgic-v5.rst +++ b/Documentation/virt/kvm/devices/arm-vgic-v5.rst @@ -130,3 +130,34 @@ Groups: ICC_CR0_EL1 ICC_PCR_EL1 =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D = =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D + + KVM_DEV_ARM_VGIC_GRP_IRS_REGS + Attributes: + The attr field of kvm_device_attr encodes the offset of the IRS regi= ster, + relative to the IRS CONFIG_FRAME base address. This is the address t= hat + was provided via KVM_VGIC_V5_ADDR_TYPE_IRS when creating VGICv5 in t= he + first place. + + kvm_device_attr.addr points to a __u64 value whatever the width + of the addressed register (32/64 bits). 64 bit registers can only + be accessed with full length. + + Writes to read-only registers are ignored by the kernel except for: + + - IRS_IDR0 - IRS_IDR2 and IRS_IDR5 - IRS_IDR7: These are sanity chec= ked to + ensure that they match a sane config. + - IRS_IDR3 and IRS_IDR4: These are RAZ/WI as nested virtualization i= s not + supported. + + For other registers, getting or setting a register has the same + effect as reading/writing the register on real hardware. + + Errors: + + =3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D + -ENXIO Offset does not correspond to any supported register + -EFAULT Invalid user pointer for attr->addr + -EINVAL Offset is not 64-bit aligned for 32-bit MMIO registers, or 64= -bit + aligned for 64-bit registers + -EBUSY one or more VCPUS are running + =3D=3D=3D=3D=3D=3D=3D =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D --=20 2.34.1