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| author | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-12-12 15:08:21 -0500 |
|---|---|---|
| committer | Boris Ostrovsky <boris.ostrovsky@oracle.com> | 2017-12-20 13:16:20 -0500 |
| commit | b3cf8528bb21febb650a7ecbf080d0647be40b9f (patch) | |
| tree | ad93a1164173c611f6ac57481efa363ae6fdac64 /include | |
| parent | 2cc42bac1c795f75fcc062b95c6ca7ac1b84d5d8 (diff) | |
| download | lwn-b3cf8528bb21febb650a7ecbf080d0647be40b9f.tar.gz lwn-b3cf8528bb21febb650a7ecbf080d0647be40b9f.zip | |
xen/balloon: Mark unallocated host memory as UNUSABLE
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@oracle.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include')
| -rw-r--r-- | include/xen/balloon.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/xen/balloon.h b/include/xen/balloon.h index 8906361bb50c..d0adfc78dcbd 100644 --- a/include/xen/balloon.h +++ b/include/xen/balloon.h @@ -43,3 +43,8 @@ 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 |