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Date: Wed, 20 Dec 2017 18:33:17 +0100 From: Juergen Gross <jgross@...e.com> To: Boris Ostrovsky <boris.ostrovsky@...cle.com>, xen-devel@...ts.xen.org, linux-kernel@...r.kernel.org Cc: helgaas@...nel.org, christian.koenig@....com, JBeulich@...e.com Subject: Re: [PATCH v3] xen/balloon: Mark unallocated host memory as UNUSABLE On 20/12/17 15:05, Boris Ostrovsky wrote: > Commit f5775e0b6116 ("x86/xen: discard RAM regions above the maximum > reservation") left host memory not assigned to dom0 as available for > memory hotplug. > > Unfortunately this also meant that those regions could be used by > others. Specifically, commit fa564ad96366 ("x86/PCI: Enable a 64bit BAR > on AMD Family 15h (Models 00-1f, 30-3f, 60-7f)") may try to map those > addresses as MMIO. > > To prevent this mark unallocated host memory as E820_TYPE_UNUSABLE (thus > effectively reverting f5775e0b6116) and keep track of that region as > a hostmem resource that can be used for the hotplug. > > Signed-off-by: Boris Ostrovsky <boris.ostrovsky@...cle.com> Reviewed-by: Juergen Gross <jgross@...e.com> Juergen
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