Re: [PATCH v8 09/10] iommufd: Add data structure for Intel VT-d stage-1 cache invalidation

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On 2023/12/28 14:38, Tian, Kevin wrote:
From: Tian, Kevin
Sent: Thursday, December 28, 2023 2:38 PM

From: Liu, Yi L <yi.l.liu@xxxxxxxxx>
Sent: Thursday, December 28, 2023 12:14 AM
+/**
+ * struct iommu_hwpt_vtd_s1_invalidate - Intel VT-d cache invalidation
+ *                                       (IOMMU_HWPT_INVALIDATE_DATA_VTD_S1)
+ * @addr: The start address of the range to be invalidated. It needs to
+ *        be 4KB aligned.
+ * @npages: Number of contiguous 4K pages to be invalidated.
+ * @flags: Combination of enum iommu_hwpt_vtd_s1_invalidate_flags
+ * @hw_error: One of enum iommu_hwpt_vtd_s1_invalidate_error
+ *
+ * The Intel VT-d specific invalidation data for user-managed stage-1 cache
+ * invalidation in nested translation. Userspace uses this structure to
+ * tell the impacted cache scope after modifying the stage-1 page table.
+ *
+ * Invalidating all the caches related to the page table by setting @addr
+ * to be 0 and @npages to be U64_MAX.
+ *
+ * The device TLB will be invalidated automatically if ATS is enabled.
+ *
+ * The @hw_error is meaningful when the entry is handled by the kernel.
+ * Check the entry_num output of IOMMU_HWPT_INVALIDATE ioctl to
know the
+ * handled entries. @hw_error only covers the errors detected by
hardware.
+ * The software detected errors would go through the normal ioctl errno.
+ */

* An entry is considered 'handled' after it passes the audit and submitted
* to the IOMMU by the underlying driver. Check the @entry_num output of
* struct iommu_hwpt_invalidate for the number of handled entries. A
'handled'
* request may still fail in hardware for various reasons, e.g. due to timeout
* on waiting for device response upon a device TLB invalidation request. In
* such case the hardware error info is reported in the @hw_error field of the
* handled entry.

with that:

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>

yep.

--
Regards,
Yi Liu




[Index of Archives]     [Linux Wireless]     [Linux Kernel]     [ATH6KL]     [Linux Bluetooth]     [Linux Netdev]     [Kernel Newbies]     [Share Photos]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Samba]     [Device Mapper]

  Powered by Linux