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Revert "xen/balloon: Mark unallocated host memory as UNUSABLE"

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This reverts commit b3cf8528bb.

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 fa564ad963
("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@citrix.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
This commit is contained in:
Igor Druzhinin
2018-11-27 20:58:21 +00:00
committed by Juergen Gross
parent 72791ac854
commit 123664101a
4 changed files with 13 additions and 141 deletions
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5
include/xen/balloon.h
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@@ -44,8 +44,3 @@ static inline void xen_balloon_init(void)
{
}
#endif
#ifdef CONFIG_XEN_BALLOON_MEMORY_HOTPLUG
struct resource;
void arch_xen_balloon_init(struct resource *hostmem_resource);
#endif