On 27 Feb 2018, at 3:19 AM, Alex Williamson wrote:
> On Sat, 24 Feb 2018 13:44:07 +0800
> jason wrote:
>
>> When using vfio to pass through a PCIe device (e.g. a GPU card) that
>> has a huge BAR (e.g. 16GB), a lot of cycles are wasted on memory
>> pinning because PFNs of PCI BAR are not backed
On Sat, 24 Feb 2018 13:44:07 +0800
jason wrote:
> When using vfio to pass through a PCIe device (e.g. a GPU card) that
> has a huge BAR (e.g. 16GB), a lot of cycles are wasted on memory
> pinning because PFNs of PCI BAR are not backed by struct page, and
> the corresponding VMA has flags VM_IO|VM
When using vfio to pass through a PCIe device (e.g. a GPU card) that
has a huge BAR (e.g. 16GB), a lot of cycles are wasted on memory
pinning because PFNs of PCI BAR are not backed by struct page, and
the corresponding VMA has flags VM_IO|VM_PFNMAP.
With this change, memory pinning process will fi
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