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>

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 @@ static int pseries_remove_lmb(unsigned long base, unsigned int lmb_size)
 	 */
 	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;
 }
 

drivers/pci/hotplug/rpadlpar_core.c

@@ -20,6 +20,7 @@
 #include <linux/init.h>
 #include <linux/pci.h>
 #include <linux/string.h>
+#include <linux/vmalloc.h>
 
 #include <asm/pci-bridge.h>
 #include <linux/mutex.h>
@@ -430,6 +431,8 @@ int dlpar_remove_slot(char *drc_name)
 			rc = dlpar_remove_pci_slot(drc_name, dn);
 			break;
 	}
+	vm_unmap_aliases();
+
 	printk(KERN_INFO "%s: slot %s removed\n", DLPAR_MODULE_NAME, drc_name);
 exit:
 	mutex_unlock(&rpadlpar_mutex);

drivers/pci/hotplug/rpaphp_core.c

@@ -29,6 +29,7 @@
 #include <linux/pci_hotplug.h>
 #include <linux/smp.h>
 #include <linux/init.h>
+#include <linux/vmalloc.h>
 #include <asm/eeh.h>       /* for eeh_add_device() */
 #include <asm/rtas.h>		/* rtas_call */
 #include <asm/pci-bridge.h>	/* for pci_controller */
@@ -418,6 +419,8 @@ static int disable_slot(struct hotplug_slot *hotplug_slot)
 		return -EINVAL;
 
 	pcibios_remove_pci_devices(slot->bus);
+	vm_unmap_aliases();
+
 	slot->state = NOT_CONFIGURED;
 	return 0;
 }