[Qemu-devel] [PATCH v2] Sort the fw_cfg file list

[minyard@acm.org]

From: Gerd Hoffmann <kraxel@redhat.com>

Entries are inserted at the correct place instead of being
appended to the end in case sorting is enabled.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>

Added a machine type handling for compatibility.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
---

Don't add a new machine type in this version, just use the 2.6 one.

 hw/i386/pc_piix.c   |  1 +
 hw/i386/pc_q35.c    |  1 +
 hw/nvram/fw_cfg.c   | 32 ++++++++++++++++++++++++++------
 include/hw/boards.h |  3 ++-
 4 files changed, 30 insertions(+), 7 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 6f8c2cd..6c68e63 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -429,6 +429,7 @@ static void pc_i440fx_2_5_machine_options(MachineClass *m)
     m->alias = NULL;
     m->is_default = 0;
     pcmc->save_tsc_khz = false;
+    m->dont_sort_fw_cfgs = 1;
     SET_MACHINE_COMPAT(m, PC_COMPAT_2_5);
 }
 
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 208a224..417fb57 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -354,6 +354,7 @@ static void pc_q35_2_5_machine_options(MachineClass *m)
     pc_q35_2_6_machine_options(m);
     m->alias = NULL;
     pcmc->save_tsc_khz = false;
+    m->dont_sort_fw_cfgs = 1;
     SET_MACHINE_COMPAT(m, PC_COMPAT_2_5);
 }
 
diff --git a/hw/nvram/fw_cfg.c b/hw/nvram/fw_cfg.c
index 79c5742..10dab77 100644
--- a/hw/nvram/fw_cfg.c
+++ b/hw/nvram/fw_cfg.c
@@ -28,6 +28,7 @@
 #include "hw/isa/isa.h"
 #include "hw/nvram/fw_cfg.h"
 #include "hw/sysbus.h"
+#include "hw/boards.h"
 #include "trace.h"
 #include "qemu/error-report.h"
 #include "qemu/config-file.h"
@@ -669,8 +670,9 @@ void fw_cfg_add_file_callback(FWCfgState *s,  const char *filename,
                               FWCfgReadCallback callback, void *callback_opaque,
                               void *data, size_t len)
 {
-    int i, index;
+    int i, index, count;
     size_t dsize;
+    MachineClass *mc = MACHINE_GET_CLASS(qdev_get_machine());
 
     if (!s->files) {
         dsize = sizeof(uint32_t) + sizeof(FWCfgFile) * FW_CFG_FILE_SLOTS;
@@ -678,13 +680,31 @@ void fw_cfg_add_file_callback(FWCfgState *s,  const char *filename,
         fw_cfg_add_bytes(s, FW_CFG_FILE_DIR, s->files, dsize);
     }
 
-    index = be32_to_cpu(s->files->count);
-    assert(index < FW_CFG_FILE_SLOTS);
+    count = be32_to_cpu(s->files->count);
+    assert(count < FW_CFG_FILE_SLOTS);
+
+    index = count;
+    if (!mc->dont_sort_fw_cfgs) {
+        while (index > 0 && strcmp(filename, s->files->f[index-1].name) < 0) {
+            s->files->f[index] =
+                s->files->f[index - 1];
+            s->files->f[index].select =
+                cpu_to_be16(FW_CFG_FILE_FIRST + index);
+            s->entries[0][FW_CFG_FILE_FIRST + index] =
+                s->entries[0][FW_CFG_FILE_FIRST + index - 1];
+            index--;
+        }
+        memset(&s->files->f[index],
+               0, sizeof(FWCfgFile));
+        memset(&s->entries[0][FW_CFG_FILE_FIRST + index],
+               0, sizeof(FWCfgEntry));
+    }
 
     pstrcpy(s->files->f[index].name, sizeof(s->files->f[index].name),
             filename);
-    for (i = 0; i < index; i++) {
-        if (strcmp(s->files->f[index].name, s->files->f[i].name) == 0) {
+    for (i = 0; i <= count; i++) {
+        if (i != index &&
+            strcmp(s->files->f[index].name, s->files->f[i].name) == 0) {
             error_report("duplicate fw_cfg file name: %s",
                          s->files->f[index].name);
             exit(1);
@@ -698,7 +718,7 @@ void fw_cfg_add_file_callback(FWCfgState *s,  const char *filename,
     s->files->f[index].select = cpu_to_be16(FW_CFG_FILE_FIRST + index);
     trace_fw_cfg_add_file(s, index, s->files->f[index].name, len);
 
-    s->files->count = cpu_to_be32(index+1);
+    s->files->count = cpu_to_be32(count+1);
 }
 
 void fw_cfg_add_file(FWCfgState *s,  const char *filename,
diff --git a/include/hw/boards.h b/include/hw/boards.h
index 0f30959..f8d99d2 100644
--- a/include/hw/boards.h
+++ b/include/hw/boards.h
@@ -85,7 +85,8 @@ struct MachineClass {
         no_sdcard:1,
         has_dynamic_sysbus:1,
         no_tco:1,
-        pci_allow_0_address:1;
+        pci_allow_0_address:1,
+        dont_sort_fw_cfgs:1;
     int is_default;
     const char *default_machine_opts;
     const char *default_boot_order;
-- 
2.5.0