Re: [PATCH v3 19/20] PCI/P2PDMA: introduce pci_mmap_p2pmem()

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Am 04.10.21 um 15:27 schrieb Jason Gunthorpe:
On Mon, Oct 04, 2021 at 03:22:22PM +0200, Christian König wrote:

That use case is completely unrelated to GUP and when this doesn't work we
have quite a problem.
My read is that unmap_mapping_range() guarentees the physical TLB
hardware is serialized across all CPUs upon return.

Thanks, that's what I wanted to make sure.

Christian.


It also guarentees GUP slow is serialized due to the page table
spinlocks.

Jason




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