Re: [PATCH] Revert "xen/balloon: Mark unallocated host memory as UNUSABLE"

[Juergen Gross]

On 27/11/2018 21:58, Igor Druzhinin wrote:
> This reverts commit b3cf8528bb21febb650a7ecbf080d0647be40b9f.
> 
> That commit unintentionally broke Xen balloon memory hotplug with
> "hotplug_unpopulated" set to 1. As long as "System RAM" resource
> got assigned under a new "Unusable memory" resource in IO/Mem tree
> any attempt to online this memory would fail due to general kernel
> restrictions on having "System RAM" resources as 1st level only.
> 
> The original issue that commit has tried to workaround fa564ad96366
> ("x86/PCI: Enable a 64bit BAR on AMD Family 15h (Models 00-1f, 30-3f,
> 60-7f)") also got amended by the following 03a551734 ("x86/PCI: Move
> and shrink AMD 64-bit window to avoid conflict") which made the
> original fix to Xen ballooning unnecessary.
> 
> Signed-off-by: Igor Druzhinin <igor.druzhinin@xxxxxxxxxx>

Pushed to xen/tip.git for-linus-4.20a


Juergen