powerpc/pseries: Flush lazy kernel mappings after unplug operations
This ensures that the translations for unmapped IO mappings or
unmapped memory are properly removed from the MMU hash table
before such an unplug. Without this, the hypervisor refuses the
unplug operations due to those resources still being mapped by
the partition.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/platforms/pseries/hotplug-memory.c b/arch/powerpc/platforms/pseries/hotplug-memory.c
index 9b21ee6..01e7b5b 100644
--- a/arch/powerpc/platforms/pseries/hotplug-memory.c
+++ b/arch/powerpc/platforms/pseries/hotplug-memory.c
@@ -11,6 +11,7 @@
#include <linux/of.h>
#include <linux/lmb.h>
+#include <linux/vmalloc.h>
#include <asm/firmware.h>
#include <asm/machdep.h>
#include <asm/pSeries_reconfig.h>
@@ -54,6 +55,12 @@
*/
start = (unsigned long)__va(base);
ret = remove_section_mapping(start, start + lmb_size);
+
+ /* Ensure all vmalloc mappings are flushed in case they also
+ * hit that section of memory
+ */
+ vm_unmap_aliases();
+
return ret;
}