[PATCH] powerpc/pseries: Flush lazy kernel mappings after unplug operations

[PATCH] powerpc/pseries: Flush lazy kernel mappings after unplug operations

[Benjamin Herrenschmidt]

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 |    7 +++++++
 drivers/pci/hotplug/rpadlpar_core.c             |    3 +++
 drivers/pci/hotplug/rpaphp_core.c               |    3 +++
 3 files changed, 13 insertions(+), 0 deletions(-)

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 @@ 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;
 }
 
diff --git a/drivers/pci/hotplug/rpadlpar_core.c b/drivers/pci/hotplug/rpadlpar_core.c
index 4e3e038..0830347 100644
--- a/drivers/pci/hotplug/rpadlpar_core.c
+++ b/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);
diff --git a/drivers/pci/hotplug/rpaphp_core.c b/drivers/pci/hotplug/rpaphp_core.c
index dcaae72..0aefc96 100644
--- a/drivers/pci/hotplug/rpaphp_core.c
+++ b/drivers/pci/hotplug/rpaphp_core.c
@@ -30,6 +30,7 @@
 #include <linux/slab.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 */
@@ -419,6 +420,8 @@ 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;
 }