From 042c76790b1168766332b1aafa4429c265d35ed0 Mon Sep 17 00:00:00 2001

From: Cole Robinson <crobinso@redhat.com>

Date: Mon, 7 Oct 2013 16:32:24 -0400

Subject: [PATCH] Fix pc migration from qemu <= 1.5

The following commit introduced a migration incompatibility:

commit 568f0690fd9aa4d39d84b04c1a5dbb53a915c3fe

Author: David Gibson <david@gibson.dropbear.id.au>

Date:   Thu Jun 6 18:48:49 2013 +1000

    pci: Replace pci_find_domain() with more general pci_root_bus_path()

The issue is that i440fx savevm idstr went from 0000:00:00.0/I440FX to

0000:00.0/I440FX. Unfortunately we are stuck with the breakage for

1.6 machine types.

Add a compat property to maintain the busted idstr for the 1.6 machine

types, but revert to the old style format for 1.7+, and <= 1.5.

Tested with migration from qemu 1.5, qemu 1.6, and qemu.git.

Cc: qemu-stable@nongnu.org

Signed-off-by: Cole Robinson <crobinso@redhat.com>

---

 hw/i386/pc_piix.c         | 11 +++++++++++

 hw/i386/pc_q35.c          | 11 +++++++++++

 hw/pci-host/piix.c        |  9 ++++++++-

 hw/pci-host/q35.c         | 10 ++++++++--

 include/hw/i386/pc.h      | 20 ++++++++++++++++++++

 include/hw/pci-host/q35.h |  1 +

 6 files changed, 59 insertions(+), 3 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c

index 2f2cb4d..10866f5 100644

--- a/hw/i386/pc_piix.c

+++ b/hw/i386/pc_piix.c

@@ -341,6 +341,13 @@ static void pc_xen_hvm_init(QEMUMachineInitArgs *args)

 }

 #endif

+#define PC_I440FX_MACHINE_OPTIONS \

+    PC_DEFAULT_MACHINE_OPTIONS, \

+    .desc = "Standard PC (i440FX + PIIX, 1996)", \

+    .hot_add_cpu = pc_hot_add_cpu

+

+#define PC_I440FX_1_6_MACHINE_OPTIONS PC_I440FX_MACHINE_OPTIONS

+

 static QEMUMachine pc_i440fx_machine_v1_6 = {

     .name = "pc-i440fx-1.6",

     .alias = "pc",

@@ -349,6 +356,10 @@ static QEMUMachine pc_i440fx_machine_v1_6 = {

     .hot_add_cpu = pc_hot_add_cpu,

     .max_cpus = 255,

     .is_default = 1,

+    .compat_props = (GlobalProperty[]) {

+        PC_COMPAT_1_6,

+        { /* end of list */ }

+    },

     DEFAULT_MACHINE_OPTIONS,

 };

diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c

index dd13130..4998ed3 100644

--- a/hw/i386/pc_q35.c

+++ b/hw/i386/pc_q35.c

@@ -243,6 +243,13 @@ static void pc_q35_init_1_4(QEMUMachineInitArgs *args)

     pc_q35_init(args);

 }

+#define PC_Q35_MACHINE_OPTIONS \

+    PC_DEFAULT_MACHINE_OPTIONS, \

+    .desc = "Standard PC (Q35 + ICH9, 2009)", \

+    .hot_add_cpu = pc_hot_add_cpu

+

+#define PC_Q35_1_6_MACHINE_OPTIONS PC_Q35_MACHINE_OPTIONS

+

 static QEMUMachine pc_q35_machine_v1_6 = {

     .name = "pc-q35-1.6",

     .alias = "q35",

@@ -250,6 +257,10 @@ static QEMUMachine pc_q35_machine_v1_6 = {

     .init = pc_q35_init_1_6,

     .hot_add_cpu = pc_hot_add_cpu,

     .max_cpus = 255,

+    .compat_props = (GlobalProperty[]) {

+        PC_COMPAT_1_6,

+        { /* end of list */ }

+    },

     DEFAULT_MACHINE_OPTIONS,

 };

diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c

index 221d82b..967f949 100644

--- a/hw/pci-host/piix.c

+++ b/hw/pci-host/piix.c

@@ -48,6 +48,7 @@ typedef struct I440FXState {

     PCIHostState parent_obj;

     PcPciInfo pci_info;

     uint64_t pci_hole64_size;

+    uint32_t short_root_bus;

 } I440FXState;

 #define PIIX_NUM_PIC_IRQS       16      /* i8259 * 2 */

@@ -706,13 +707,19 @@ static const TypeInfo i440fx_info = {

 static const char *i440fx_pcihost_root_bus_path(PCIHostState *host_bridge,

                                                 PCIBus *rootbus)

 {

+    I440FXState *s = I440FX_PCI_HOST_BRIDGE(host_bridge);

+

     /* For backwards compat with old device paths */

-    return "0000";

+    if (s->short_root_bus) {

+        return "0000";

+    }

+    return "0000:00";

 }

 static Property i440fx_props[] = {

     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, I440FXState,

                      pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),

+    DEFINE_PROP_UINT32("short_root_bus", I440FXState, short_root_bus, 0),

     DEFINE_PROP_END_OF_LIST(),

 };

diff --git a/hw/pci-host/q35.c b/hw/pci-host/q35.c

index 4febd24..f762053 100644

--- a/hw/pci-host/q35.c

+++ b/hw/pci-host/q35.c

@@ -61,8 +61,13 @@ static void q35_host_realize(DeviceState *dev, Error **errp)

 static const char *q35_host_root_bus_path(PCIHostState *host_bridge,

                                           PCIBus *rootbus)

 {

-    /* For backwards compat with old device paths */

-    return "0000";

+    Q35PCIHost *s = Q35_HOST_DEVICE(host_bridge);

+

+     /* For backwards compat with old device paths */

+    if (s->mch.short_root_bus) {

+        return "0000";

+    }

+    return "0000:00";

 }

 static void q35_host_get_pci_hole_start(Object *obj, Visitor *v,

@@ -108,6 +113,7 @@ static Property mch_props[] = {

                         MCH_HOST_BRIDGE_PCIEXBAR_DEFAULT),

     DEFINE_PROP_SIZE(PCI_HOST_PROP_PCI_HOLE64_SIZE, Q35PCIHost,

                      mch.pci_hole64_size, DEFAULT_PCI_HOLE64_SIZE),

+    DEFINE_PROP_UINT32("short_root_bus", Q35PCIHost, mch.short_root_bus, 0),

     DEFINE_PROP_END_OF_LIST(),

 };

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h

index 475ba9e..6e2b839 100644

--- a/include/hw/i386/pc.h

+++ b/include/hw/i386/pc.h

@@ -225,7 +225,19 @@ void pvpanic_init(ISABus *bus);

 int e820_add_entry(uint64_t, uint64_t, uint32_t);

+#define PC_COMPAT_1_6 \

+        {\

+            .driver   = "i440FX-pcihost",\

+            .property = "short_root_bus",\

+            .value    = stringify(1),\

+        },{\

+            .driver   = "q35-pcihost",\

+            .property = "short_root_bus",\

+            .value    = stringify(1),\

+        }

+

 #define PC_COMPAT_1_5 \

+        PC_COMPAT_1_6, \

         {\

             .driver   = "Conroe-" TYPE_X86_CPU,\

             .property = "model",\

@@ -258,6 +270,14 @@ int e820_add_entry(uint64_t, uint64_t, uint32_t);

             .driver = TYPE_X86_CPU,\

             .property = "pmu",\

             .value = "on",\

+        },{\

+            .driver   = "i440FX-pcihost",\

+            .property = "short_root_bus",\

+            .value    = stringify(0),\

+        },{\

+            .driver   = "q35-pcihost",\

+            .property = "short_root_bus",\

+            .value    = stringify(0),\

         }

 #define PC_COMPAT_1_4 \

diff --git a/include/hw/pci-host/q35.h b/include/hw/pci-host/q35.h

index 6eb7ab6..95a3cc2 100644

--- a/include/hw/pci-host/q35.h

+++ b/include/hw/pci-host/q35.h

@@ -61,6 +61,7 @@ typedef struct MCHPCIState {

     ram_addr_t above_4g_mem_size;

     uint64_t pci_hole64_size;

     PcGuestInfo *guest_info;

+    uint32_t short_root_bus;

 } MCHPCIState;

 typedef struct Q35PCIHost {