Re: [Xen-devel] [PATCH v2] xen/swiotlb: don't initialize swiotlb twice on arm64

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Tue, 28 May 2019, Boris Ostrovsky wrote:
> On 5/28/19 6:48 PM, Stefano Stabellini wrote:
> > From: Stefano Stabellini <stefanos@xxxxxxxxxx>
> >
> > On arm64 swiotlb is often (not always) already initialized by mem_init.
> > We don't want to initialize it twice, which would trigger a second
> > memory allocation. Moreover, the second memory pool is typically made of
> > high pages and ends up replacing the original memory pool of low pages.
> > As a side effect of this change, it is possible to have low pages in
> > swiotlb-xen on arm64.
> >
> > Signed-off-by: Stefano Stabellini <stefanos@xxxxxxxxxx>
> 
> Has this been tested on x86?

Yes, I managed to test it using QEMU. There are no effects on x86, as
the check io_tlb_start != 0 returns false.

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