Re: [Xen-devel] [PATCH v3 10/10] x86/MSI-X: provide hypercall interface for mask-all control

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 19.06.15 at 15:05, <konrad.wilk@xxxxxxxxxx> wrote:
>>And now that I started looking into what it takes to make this
>>work, I'm having a deja vu: In order for us to reliably intercept
>>all CFG accesses, we need to whitelist the MMCFG pages of
>>devices we know we don't care about being written. I.e. we
>>need to start out with all of them being read-only. And the
>>affected MFNs have to be known before Dom0 maps these
>>pages (or else we would have to hunt down all the mappings in
>>the page tables, which is nothing I consider even remotely
>>reasonable). Yet, and here comes the deja vu, upstream Linux
>>_still_ doesn't make use of PHYSDEVOP_pci_mmcfg_reserved.
> 
> Yes it does: 
> http://lists.xenproject.org/archives/html/xen-devel/2013-11/msg00807.html 

Oh, sorry - I expected it to live somewhere under arch/x86/.

Jan


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