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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