Re: [Xen-devel] [PATCH] xen/mm: Alter is_iomem_page() to use mfn_t

[David Woodhouse <dwmw2@xxxxxxxxxxxxx>]

On Thu, 2017-02-09 at 11:54 +0800, Chao Gao wrote:
> 
> Jan is right. When the assertion fails, the value of gfn is 0xfee00.
> 
> Do you mean that is_iomem_page() is equal to direct_mmio except some
> corner cases such as APIC access MFN and INVALID_MFN( any others? ) ?

That was the hypothesis, and it seems reasonable.

But I also note you're only testing that hypothesis in the
direct_mmio==1 case. You don't test the hypothesis that if
direct_mmio==0, then so is is_iomem_page().

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