Hi, Dave, Dave Hansen <dave.hansen@xxxxxxxxx> writes: > On 12/13/2017 07:38 PM, Lu Baolu wrote: >> 2. When vmalloc/vfree interfaces are called, the page mappings >> for kernel memory might get changed. And current code calls >> flush_tlb_kernel_range() to flush CPU TLBs only. The IOTLB or >> DevTLB will be stale compared to that on the cpu for kernel >> mappings. > > What's the plan to deal with all of the ways other than vmalloc() that > the kernel changes the page tables? The kernel MMU notifier is called in flush_tlb_kernel_range(). So IOMMU will be notified for TLB flushing caused by all ways that the kernel changes the page tables including vmalloc, kmap, etc. Best Regards, Huang, Ying -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
