File libxc-sr-restore-populate_pfns-pfns.patch of Package xen.21116

From: Olaf Hering <olaf@aepfle.de>
Date: Fri, 23 Oct 2020 14:58:53 +0200
Subject: libxc sr restore populate_pfns pfns

tools/guest: restore: move pfns array in populate_pfns

Remove allocation from hotpath, move populate_pfns' pfns array into preallocated space.
Use some prefix to avoid conflict with an array used in handle_page_data.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
---
 tools/libxc/xc_sr_common.h  |  1 +
 tools/libxc/xc_sr_restore.c | 11 +----------
 2 files changed, 2 insertions(+), 10 deletions(-)

--- xen-4.14.0-testing.orig/tools/libxc/xc_sr_common.h
+++ xen-4.14.0-testing/tools/libxc/xc_sr_common.h
@@ -233,6 +233,7 @@ struct xc_sr_restore_arrays {
     int map_errs[MAX_BATCH_SIZE];
     /* populate_pfns */
     xen_pfn_t pp_mfns[MAX_BATCH_SIZE];
+    xen_pfn_t pp_pfns[MAX_BATCH_SIZE];
 };
 
 struct xc_sr_context
--- xen-4.14.0-testing.orig/tools/libxc/xc_sr_restore.c
+++ xen-4.14.0-testing/tools/libxc/xc_sr_restore.c
@@ -139,17 +139,10 @@ int populate_pfns(struct xc_sr_context *
 {
     xc_interface *xch = ctx->xch;
     xen_pfn_t *mfns = ctx->restore.m->pp_mfns,
-        *pfns = malloc(count * sizeof(*pfns));
+        *pfns = ctx->restore.m->pp_pfns;
     unsigned int i, nr_pfns = 0;
     int rc = -1;
 
-    if ( !pfns )
-    {
-        ERROR("Failed to allocate %zu bytes for populating the physmap",
-              2 * count * sizeof(*mfns));
-        goto err;
-    }
-
     for ( i = 0; i < count; ++i )
     {
         if ( (!types ||
@@ -190,8 +183,6 @@ int populate_pfns(struct xc_sr_context *
     rc = 0;
 
  err:
-    free(pfns);
-
     return rc;
 }