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xen: bug fixes for 3.17-rc4

Browse source 
- Fix for PVHVM suspend/resume and migration
 - Don't pointlessly retry certain ballooning ops
 - Fix gntalloc when grefs have run out.
 - Fix PV boot if KSALR is enable or very large modules are used.
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Merge tag 'stable/for-linus-3.17-b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Pull Xen bug fixes from David Vrabel:
 - fix for PVHVM suspend/resume and migration
 - don't pointlessly retry certain ballooning ops
 - fix gntalloc when grefs have run out.
 - fix PV boot if KSALR is enable or very large modules are used.

* tag 'stable/for-linus-3.17-b-rc4-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  x86/xen: don't copy bogus duplicate entries into kernel page tables
  xen/gntalloc: safely delete grefs in add_grefs() undo path
  xen/gntalloc: fix oops after runnning out of grant refs
  xen/balloon: cancel ballooning if adding new memory failed
  xen/manage: Always freeze/thaw processes when suspend/resuming
This commit is contained in:
Linus Torvalds 2014-09-11 16:52:29 -07:00
commit 7ee2d2d671
5 changed files with 22 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

4
drivers/xen/balloon.c
View file

@ -230,8 +230,8 @@ static enum bp_state reserve_additional_memory(long credit)
rc = add_memory(nid, hotplug_start_paddr, balloon_hotplug << PAGE_SHIFT);
if (rc) {
pr_info("%s: add_memory() failed: %i\n", __func__, rc);
return BP_EAGAIN;
pr_warn("Cannot add additional memory (%i)\n", rc);
return BP_ECANCELED;
}
balloon_hotplug -= credit;

16
drivers/xen/gntalloc.c
View file

@ -124,7 +124,7 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
int i, rc, readonly;
LIST_HEAD(queue_gref);
LIST_HEAD(queue_file);
struct gntalloc_gref *gref;
struct gntalloc_gref *gref, *next;
readonly = !(op->flags & GNTALLOC_FLAG_WRITABLE);
rc = -ENOMEM;
@ -141,13 +141,11 @@ static int add_grefs(struct ioctl_gntalloc_alloc_gref *op,
goto undo;
/* Grant foreign access to the page. */
gref->gref_id = gnttab_grant_foreign_access(op->domid,
rc = gnttab_grant_foreign_access(op->domid,
pfn_to_mfn(page_to_pfn(gref->page)), readonly);
if ((int)gref->gref_id < 0) {
rc = gref->gref_id;
if (rc < 0)
goto undo;
}
gref_ids[i] = gref->gref_id;
gref_ids[i] = gref->gref_id = rc;
}
/* Add to gref lists. */
@ -162,8 +160,8 @@ undo:
mutex_lock(&gref_mutex);
gref_size -= (op->count - i);
list_for_each_entry(gref, &queue_file, next_file) {
/* __del_gref does not remove from queue_file */
list_for_each_entry_safe(gref, next, &queue_file, next_file) {
list_del(&gref->next_file);
__del_gref(gref);
}
@ -193,7 +191,7 @@ static void __del_gref(struct gntalloc_gref *gref)
gref->notify.flags = 0;
if (gref->gref_id > 0) {
if (gref->gref_id) {
if (gnttab_query_foreign_access(gref->gref_id))
return;

7
drivers/xen/manage.c
View file

@ -103,16 +103,11 @@ static void do_suspend(void)
shutting_down = SHUTDOWN_SUSPEND;
#ifdef CONFIG_PREEMPT
/* If the kernel is preemptible, we need to freeze all the processes
to prevent them from being in the middle of a pagetable update
during suspend. */
err = freeze_processes();
if (err) {
pr_err("%s: freeze failed %d\n", __func__, err);
goto out;
}
#endif
err = dpm_suspend_start(PMSG_FREEZE);
if (err) {
@ -157,10 +152,8 @@ out_resume:
dpm_resume_end(si.cancelled ? PMSG_THAW : PMSG_RESTORE);
out_thaw:
#ifdef CONFIG_PREEMPT
thaw_processes();
out:
#endif
shutting_down = SHUTDOWN_INVALID;
}
#endif /* CONFIG_HIBERNATE_CALLBACKS */