Merge tag 'for-linus-4.19d-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip

Juergen writes:
  "xen:
   Two small fixes for xen drivers."

* tag 'for-linus-4.19d-rc5-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  xen: issue warning message when out of grant maptrack entries
  xen/x86/vpmu: Zero struct pt_regs before calling into sample handling code

2 files changed, 22 insertions, 7 deletions

diff --git a/arch/x86/xen/pmu.c b/arch/x86/xen/pmu.c
index 7d00d4ad44d4..95997e6c0696 100644
--- a/arch/x86/xen/pmu.c
+++ b/arch/x86/xen/pmu.c
@@ -478,7 +478,7 @@ static void xen_convert_regs(const struct xen_pmu_regs *xen_regs,
 irqreturn_t xen_pmu_irq_handler(int irq, void *dev_id)
 {
         int err, ret = IRQ_NONE;
-        struct pt_regs regs;
+        struct pt_regs regs = {0};
         const struct xen_pmu_data *xenpmu_data = get_xenpmu_data();
         uint8_t xenpmu_flags = get_xenpmu_flags();
 
diff --git a/drivers/xen/grant-table.c b/drivers/xen/grant-table.c
index 7bafa703a992..84575baceebc 100644
--- a/drivers/xen/grant-table.c
+++ b/drivers/xen/grant-table.c
@@ -1040,18 +1040,33 @@ int gnttab_map_refs(struct gnttab_map_grant_ref *map_ops,
                 return ret;
 
         for (i = 0; i < count; i++) {
-                /* Retry eagain maps */
-                if (map_ops[i].status == GNTST_eagain)
-                        gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref, map_ops + i,
-                                                &map_ops[i].status, __func__);
-
-                if (map_ops[i].status == GNTST_okay) {
+                switch (map_ops[i].status) {
+                case GNTST_okay:
+                {
                         struct xen_page_foreign *foreign;
 
                         SetPageForeign(pages[i]);
                         foreign = xen_page_foreign(pages[i]);
                         foreign->domid = map_ops[i].dom;
                         foreign->gref = map_ops[i].ref;
+                        break;
+                }
+
+                case GNTST_no_device_space:
+                        pr_warn_ratelimited("maptrack limit reached, can't map all guest pages\n");
+                        break;
+
+                case GNTST_eagain:
+                        /* Retry eagain maps */
+                        gnttab_retry_eagain_gop(GNTTABOP_map_grant_ref,
+                                                map_ops + i,
+                                                &map_ops[i].status, __func__);
+                        /* Test status in next loop iteration. */
+                        i--;
+                        break;
+
+                default:
+                        break;
                 }
         }