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SubjectRe: [PATCH V2 1/2] Swiotlb: Add swiotlb_alloc_from_low_pages switch
On Mon, Feb 21, 2022 at 11:14:58PM +0800, Tianyu Lan wrote:
> Sorry. The boot failure is not related with these patches and the issue
> has been fixed in the latest upstream code.
>
> There is a performance bottleneck due to io tlb mem's spin lock during
> performance test. All devices'io queues uses same io tlb mem entry
> and the spin lock of io tlb mem introduce overheads. There is a fix patch
> from Andi Kleen in the github. Could you have a look?
>
> https://github.com/intel/tdx/commit/4529b5784c141782c72ec9bd9a92df2b68cb7d45

Please post these things to the list.

But I suspect the right answer for the "secure" hypervisor case is to
use the per-device swiotlb regions that we've recently added.

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