Re: [Xen-devel] [v6][PATCH 3/7] tools/libxc: check if mmio BAR is out of reserved device memory maps

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Chen, Tiejun
> Sent: Wednesday, September 10, 2014 6:15 PM
> 
> On 2014/9/11 5:37, Tian, Kevin wrote:
> >> From: Chen, Tiejun
> >> Sent: Tuesday, September 09, 2014 10:50 PM
> >>
> >> We need to avoid allocating MMIO BAR conflicting to all reserved device
> >> memory range.
> >
> > besides checking MMIO BAR confliction, you also need check guest memory
> > confliction with reserved device memory ranges.
> 
> Kexin,
> 
> In patch #6, hvmloader: check to reserved device memory maps in e820,
> we'll lookup the entire e820 table to check if RMRR is overlapping with
> all recorded ranges in e820, so I think that already cover this case, right?
> 

yes, forgot my comment then. My comment was still based on the assumption
that we'll both detect and fix confliction, so 'fix' means we need do something
before P2M is allocated. But since the decision now is only for detection, yes
patch #6 is enough then.

Thanks
Kevin

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