[v3,3/4] x86: move max-ram-below-4g to pc
diff mbox series

Message ID 20200529073957.8018-4-kraxel@redhat.com
State New
Headers show
Series
  • microvm: memory config tweaks
Related show

Commit Message

Gerd Hoffmann May 29, 2020, 7:39 a.m. UTC
Move from X86MachineClass to PCMachineClass so it disappears
from microvm machine type property list.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
---
 include/hw/i386/pc.h  |  2 ++
 include/hw/i386/x86.h |  4 ----
 hw/i386/pc.c          | 46 +++++++++++++++++++++++++++++++++++++++++++
 hw/i386/pc_piix.c     | 10 +++++-----
 hw/i386/pc_q35.c      | 10 +++++-----
 hw/i386/x86.c         | 46 -------------------------------------------
 hw/i386/xen/xen-hvm.c |  2 +-
 7 files changed, 59 insertions(+), 61 deletions(-)

Comments

Paul Durrant May 29, 2020, 7:44 a.m. UTC | #1
> -----Original Message-----
> From: Gerd Hoffmann <kraxel@redhat.com>
> Sent: 29 May 2020 08:40
> To: qemu-devel@nongnu.org
> Cc: Paolo Bonzini <pbonzini@redhat.com>; Eduardo Habkost <ehabkost@redhat.com>; Sergio Lopez
> <slp@redhat.com>; philmd@redhat.com; Marcel Apfelbaum <marcel.apfelbaum@gmail.com>; Stefano Stabellini
> <sstabellini@kernel.org>; Paul Durrant <paul@xen.org>; xen-devel@lists.xenproject.org; Michael S.
> Tsirkin <mst@redhat.com>; Anthony Perard <anthony.perard@citrix.com>; Richard Henderson
> <rth@twiddle.net>; imammedo@redhat.com; Gerd Hoffmann <kraxel@redhat.com>
> Subject: [PATCH v3 3/4] x86: move max-ram-below-4g to pc
> 
> Move from X86MachineClass to PCMachineClass so it disappears
> from microvm machine type property list.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
> Acked-by: Paolo Bonzini <pbonzini@redhat.com>

Xen change...

Reviewed-by: Paul Durrant <paul@xen.org>

> ---
>  include/hw/i386/pc.h  |  2 ++
>  include/hw/i386/x86.h |  4 ----
>  hw/i386/pc.c          | 46 +++++++++++++++++++++++++++++++++++++++++++
>  hw/i386/pc_piix.c     | 10 +++++-----
>  hw/i386/pc_q35.c      | 10 +++++-----
>  hw/i386/x86.c         | 46 -------------------------------------------
>  hw/i386/xen/xen-hvm.c |  2 +-
>  7 files changed, 59 insertions(+), 61 deletions(-)
> 
> diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
> index 5e3b19ab78fc..dce1273c7dad 100644
> --- a/include/hw/i386/pc.h
> +++ b/include/hw/i386/pc.h
> @@ -35,6 +35,7 @@ struct PCMachineState {
>      PFlashCFI01 *flash[2];
> 
>      /* Configuration options: */
> +    uint64_t max_ram_below_4g;
>      OnOffAuto vmport;
> 
>      bool acpi_build_enabled;
> @@ -51,6 +52,7 @@ struct PCMachineState {
>  };
> 
>  #define PC_MACHINE_ACPI_DEVICE_PROP "acpi-device"
> +#define PC_MACHINE_MAX_RAM_BELOW_4G "max-ram-below-4g"
>  #define PC_MACHINE_DEVMEM_REGION_SIZE "device-memory-region-size"
>  #define PC_MACHINE_VMPORT           "vmport"
>  #define PC_MACHINE_SMBUS            "smbus"
> diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
> index b52285481687..b79f24e28545 100644
> --- a/include/hw/i386/x86.h
> +++ b/include/hw/i386/x86.h
> @@ -51,9 +51,6 @@ typedef struct {
>      qemu_irq *gsi;
>      GMappedFile *initrd_mapped_file;
> 
> -    /* Configuration options: */
> -    uint64_t max_ram_below_4g;
> -
>      /* RAM information (sizes, addresses, configuration): */
>      ram_addr_t below_4g_mem_size, above_4g_mem_size;
> 
> @@ -82,7 +79,6 @@ typedef struct {
>      AddressSpace *ioapic_as;
>  } X86MachineState;
> 
> -#define X86_MACHINE_MAX_RAM_BELOW_4G "max-ram-below-4g"
>  #define X86_MACHINE_SMM              "smm"
>  #define X86_MACHINE_ACPI             "acpi"
> 
> diff --git a/hw/i386/pc.c b/hw/i386/pc.c
> index c5db7be6d8b1..6d6f6decb32c 100644
> --- a/hw/i386/pc.c
> +++ b/hw/i386/pc.c
> @@ -1831,6 +1831,45 @@ static void pc_machine_set_pit(Object *obj, bool value, Error **errp)
>      pcms->pit_enabled = value;
>  }
> 
> +static void pc_machine_get_max_ram_below_4g(Object *obj, Visitor *v,
> +                                            const char *name, void *opaque,
> +                                            Error **errp)
> +{
> +    PCMachineState *pcms = PC_MACHINE(obj);
> +    uint64_t value = pcms->max_ram_below_4g;
> +
> +    visit_type_size(v, name, &value, errp);
> +}
> +
> +static void pc_machine_set_max_ram_below_4g(Object *obj, Visitor *v,
> +                                            const char *name, void *opaque,
> +                                            Error **errp)
> +{
> +    PCMachineState *pcms = PC_MACHINE(obj);
> +    Error *error = NULL;
> +    uint64_t value;
> +
> +    visit_type_size(v, name, &value, &error);
> +    if (error) {
> +        error_propagate(errp, error);
> +        return;
> +    }
> +    if (value > 4 * GiB) {
> +        error_setg(&error,
> +                   "Machine option 'max-ram-below-4g=%"PRIu64
> +                   "' expects size less than or equal to 4G", value);
> +        error_propagate(errp, error);
> +        return;
> +    }
> +
> +    if (value < 1 * MiB) {
> +        warn_report("Only %" PRIu64 " bytes of RAM below the 4GiB boundary,"
> +                    "BIOS may not work with less than 1MiB", value);
> +    }
> +
> +    pcms->max_ram_below_4g = value;
> +}
> +
>  static void pc_machine_initfn(Object *obj)
>  {
>      PCMachineState *pcms = PC_MACHINE(obj);
> @@ -1840,6 +1879,7 @@ static void pc_machine_initfn(Object *obj)
>  #else
>      pcms->vmport = ON_OFF_AUTO_OFF;
>  #endif /* CONFIG_VMPORT */
> +    pcms->max_ram_below_4g = 0; /* use default */
>      /* acpi build is enabled by default if machine supports it */
>      pcms->acpi_build_enabled = PC_MACHINE_GET_CLASS(pcms)->has_acpi_build;
>      pcms->smbus_enabled = true;
> @@ -1938,6 +1978,12 @@ static void pc_machine_class_init(ObjectClass *oc, void *data)
>      mc->numa_mem_supported = true;
>      mc->default_ram_id = "pc.ram";
> 
> +    object_class_property_add(oc, PC_MACHINE_MAX_RAM_BELOW_4G, "size",
> +        pc_machine_get_max_ram_below_4g, pc_machine_set_max_ram_below_4g,
> +        NULL, NULL);
> +    object_class_property_set_description(oc, PC_MACHINE_MAX_RAM_BELOW_4G,
> +        "Maximum ram below the 4G boundary (32bit boundary)");
> +
>      object_class_property_add(oc, PC_MACHINE_DEVMEM_REGION_SIZE, "int",
>          pc_machine_get_device_memory_region_size, NULL,
>          NULL, NULL);
> diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
> index f66e1d73ce0b..503c35f7bf4c 100644
> --- a/hw/i386/pc_piix.c
> +++ b/hw/i386/pc_piix.c
> @@ -127,11 +127,11 @@ static void pc_init1(MachineState *machine,
>      if (xen_enabled()) {
>          xen_hvm_init(pcms, &ram_memory);
>      } else {
> -        if (!x86ms->max_ram_below_4g) {
> -            x86ms->max_ram_below_4g = 0xe0000000; /* default: 3.5G */
> +        if (!pcms->max_ram_below_4g) {
> +            pcms->max_ram_below_4g = 0xe0000000; /* default: 3.5G */
>          }
> -        lowmem = x86ms->max_ram_below_4g;
> -        if (machine->ram_size >= x86ms->max_ram_below_4g) {
> +        lowmem = pcms->max_ram_below_4g;
> +        if (machine->ram_size >= pcms->max_ram_below_4g) {
>              if (pcmc->gigabyte_align) {
>                  if (lowmem > 0xc0000000) {
>                      lowmem = 0xc0000000;
> @@ -140,7 +140,7 @@ static void pc_init1(MachineState *machine,
>                      warn_report("Large machine and max_ram_below_4g "
>                                  "(%" PRIu64 ") not a multiple of 1G; "
>                                  "possible bad performance.",
> -                                x86ms->max_ram_below_4g);
> +                                pcms->max_ram_below_4g);
>                  }
>              }
>          }
> diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
> index 4ba8ac8774e4..90e8fb2cb737 100644
> --- a/hw/i386/pc_q35.c
> +++ b/hw/i386/pc_q35.c
> @@ -154,18 +154,18 @@ static void pc_q35_init(MachineState *machine)
>      /* Handle the machine opt max-ram-below-4g.  It is basically doing
>       * min(qemu limit, user limit).
>       */
> -    if (!x86ms->max_ram_below_4g) {
> -        x86ms->max_ram_below_4g = 4 * GiB;
> +    if (!pcms->max_ram_below_4g) {
> +        pcms->max_ram_below_4g = 4 * GiB;
>      }
> -    if (lowmem > x86ms->max_ram_below_4g) {
> -        lowmem = x86ms->max_ram_below_4g;
> +    if (lowmem > pcms->max_ram_below_4g) {
> +        lowmem = pcms->max_ram_below_4g;
>          if (machine->ram_size - lowmem > lowmem &&
>              lowmem & (1 * GiB - 1)) {
>              warn_report("There is possibly poor performance as the ram size "
>                          " (0x%" PRIx64 ") is more then twice the size of"
>                          " max-ram-below-4g (%"PRIu64") and"
>                          " max-ram-below-4g is not a multiple of 1G.",
> -                        (uint64_t)machine->ram_size, x86ms->max_ram_below_4g);
> +                        (uint64_t)machine->ram_size, pcms->max_ram_below_4g);
>          }
>      }
> 
> diff --git a/hw/i386/x86.c b/hw/i386/x86.c
> index 7a3bc7ab6639..49884e5c1597 100644
> --- a/hw/i386/x86.c
> +++ b/hw/i386/x86.c
> @@ -846,45 +846,6 @@ void x86_bios_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
>                                  bios);
>  }
> 
> -static void x86_machine_get_max_ram_below_4g(Object *obj, Visitor *v,
> -                                             const char *name, void *opaque,
> -                                             Error **errp)
> -{
> -    X86MachineState *x86ms = X86_MACHINE(obj);
> -    uint64_t value = x86ms->max_ram_below_4g;
> -
> -    visit_type_size(v, name, &value, errp);
> -}
> -
> -static void x86_machine_set_max_ram_below_4g(Object *obj, Visitor *v,
> -                                             const char *name, void *opaque,
> -                                             Error **errp)
> -{
> -    X86MachineState *x86ms = X86_MACHINE(obj);
> -    Error *error = NULL;
> -    uint64_t value;
> -
> -    visit_type_size(v, name, &value, &error);
> -    if (error) {
> -        error_propagate(errp, error);
> -        return;
> -    }
> -    if (value > 4 * GiB) {
> -        error_setg(&error,
> -                   "Machine option 'max-ram-below-4g=%"PRIu64
> -                   "' expects size less than or equal to 4G", value);
> -        error_propagate(errp, error);
> -        return;
> -    }
> -
> -    if (value < 1 * MiB) {
> -        warn_report("Only %" PRIu64 " bytes of RAM below the 4GiB boundary,"
> -                    "BIOS may not work with less than 1MiB", value);
> -    }
> -
> -    x86ms->max_ram_below_4g = value;
> -}
> -
>  bool x86_machine_is_smm_enabled(X86MachineState *x86ms)
>  {
>      bool smm_available = false;
> @@ -958,7 +919,6 @@ static void x86_machine_initfn(Object *obj)
> 
>      x86ms->smm = ON_OFF_AUTO_AUTO;
>      x86ms->acpi = ON_OFF_AUTO_AUTO;
> -    x86ms->max_ram_below_4g = 0; /* use default */
>      x86ms->smp_dies = 1;
> 
>      x86ms->apicid_from_cpu_idx = x86_apicid_from_cpu_idx;
> @@ -980,12 +940,6 @@ static void x86_machine_class_init(ObjectClass *oc, void *data)
>      x86mc->save_tsc_khz = true;
>      nc->nmi_monitor_handler = x86_nmi;
> 
> -    object_class_property_add(oc, X86_MACHINE_MAX_RAM_BELOW_4G, "size",
> -        x86_machine_get_max_ram_below_4g, x86_machine_set_max_ram_below_4g,
> -        NULL, NULL);
> -    object_class_property_set_description(oc, X86_MACHINE_MAX_RAM_BELOW_4G,
> -        "Maximum ram below the 4G boundary (32bit boundary)");
> -
>      object_class_property_add(oc, X86_MACHINE_SMM, "OnOffAuto",
>          x86_machine_get_smm, x86_machine_set_smm,
>          NULL, NULL);
> diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
> index 82ece6b9e739..d6f4674418e9 100644
> --- a/hw/i386/xen/xen-hvm.c
> +++ b/hw/i386/xen/xen-hvm.c
> @@ -203,7 +203,7 @@ static void xen_ram_init(PCMachineState *pcms,
>      ram_addr_t block_len;
>      uint64_t user_lowmem =
>          object_property_get_uint(qdev_get_machine(),
> -                                 X86_MACHINE_MAX_RAM_BELOW_4G,
> +                                 PC_MACHINE_MAX_RAM_BELOW_4G,
>                                   &error_abort);
> 
>      /* Handle the machine opt max-ram-below-4g.  It is basically doing
> --
> 2.18.4

Patch
diff mbox series

diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h
index 5e3b19ab78fc..dce1273c7dad 100644
--- a/include/hw/i386/pc.h
+++ b/include/hw/i386/pc.h
@@ -35,6 +35,7 @@  struct PCMachineState {
     PFlashCFI01 *flash[2];
 
     /* Configuration options: */
+    uint64_t max_ram_below_4g;
     OnOffAuto vmport;
 
     bool acpi_build_enabled;
@@ -51,6 +52,7 @@  struct PCMachineState {
 };
 
 #define PC_MACHINE_ACPI_DEVICE_PROP "acpi-device"
+#define PC_MACHINE_MAX_RAM_BELOW_4G "max-ram-below-4g"
 #define PC_MACHINE_DEVMEM_REGION_SIZE "device-memory-region-size"
 #define PC_MACHINE_VMPORT           "vmport"
 #define PC_MACHINE_SMBUS            "smbus"
diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h
index b52285481687..b79f24e28545 100644
--- a/include/hw/i386/x86.h
+++ b/include/hw/i386/x86.h
@@ -51,9 +51,6 @@  typedef struct {
     qemu_irq *gsi;
     GMappedFile *initrd_mapped_file;
 
-    /* Configuration options: */
-    uint64_t max_ram_below_4g;
-
     /* RAM information (sizes, addresses, configuration): */
     ram_addr_t below_4g_mem_size, above_4g_mem_size;
 
@@ -82,7 +79,6 @@  typedef struct {
     AddressSpace *ioapic_as;
 } X86MachineState;
 
-#define X86_MACHINE_MAX_RAM_BELOW_4G "max-ram-below-4g"
 #define X86_MACHINE_SMM              "smm"
 #define X86_MACHINE_ACPI             "acpi"
 
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index c5db7be6d8b1..6d6f6decb32c 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1831,6 +1831,45 @@  static void pc_machine_set_pit(Object *obj, bool value, Error **errp)
     pcms->pit_enabled = value;
 }
 
+static void pc_machine_get_max_ram_below_4g(Object *obj, Visitor *v,
+                                            const char *name, void *opaque,
+                                            Error **errp)
+{
+    PCMachineState *pcms = PC_MACHINE(obj);
+    uint64_t value = pcms->max_ram_below_4g;
+
+    visit_type_size(v, name, &value, errp);
+}
+
+static void pc_machine_set_max_ram_below_4g(Object *obj, Visitor *v,
+                                            const char *name, void *opaque,
+                                            Error **errp)
+{
+    PCMachineState *pcms = PC_MACHINE(obj);
+    Error *error = NULL;
+    uint64_t value;
+
+    visit_type_size(v, name, &value, &error);
+    if (error) {
+        error_propagate(errp, error);
+        return;
+    }
+    if (value > 4 * GiB) {
+        error_setg(&error,
+                   "Machine option 'max-ram-below-4g=%"PRIu64
+                   "' expects size less than or equal to 4G", value);
+        error_propagate(errp, error);
+        return;
+    }
+
+    if (value < 1 * MiB) {
+        warn_report("Only %" PRIu64 " bytes of RAM below the 4GiB boundary,"
+                    "BIOS may not work with less than 1MiB", value);
+    }
+
+    pcms->max_ram_below_4g = value;
+}
+
 static void pc_machine_initfn(Object *obj)
 {
     PCMachineState *pcms = PC_MACHINE(obj);
@@ -1840,6 +1879,7 @@  static void pc_machine_initfn(Object *obj)
 #else
     pcms->vmport = ON_OFF_AUTO_OFF;
 #endif /* CONFIG_VMPORT */
+    pcms->max_ram_below_4g = 0; /* use default */
     /* acpi build is enabled by default if machine supports it */
     pcms->acpi_build_enabled = PC_MACHINE_GET_CLASS(pcms)->has_acpi_build;
     pcms->smbus_enabled = true;
@@ -1938,6 +1978,12 @@  static void pc_machine_class_init(ObjectClass *oc, void *data)
     mc->numa_mem_supported = true;
     mc->default_ram_id = "pc.ram";
 
+    object_class_property_add(oc, PC_MACHINE_MAX_RAM_BELOW_4G, "size",
+        pc_machine_get_max_ram_below_4g, pc_machine_set_max_ram_below_4g,
+        NULL, NULL);
+    object_class_property_set_description(oc, PC_MACHINE_MAX_RAM_BELOW_4G,
+        "Maximum ram below the 4G boundary (32bit boundary)");
+
     object_class_property_add(oc, PC_MACHINE_DEVMEM_REGION_SIZE, "int",
         pc_machine_get_device_memory_region_size, NULL,
         NULL, NULL);
diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index f66e1d73ce0b..503c35f7bf4c 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -127,11 +127,11 @@  static void pc_init1(MachineState *machine,
     if (xen_enabled()) {
         xen_hvm_init(pcms, &ram_memory);
     } else {
-        if (!x86ms->max_ram_below_4g) {
-            x86ms->max_ram_below_4g = 0xe0000000; /* default: 3.5G */
+        if (!pcms->max_ram_below_4g) {
+            pcms->max_ram_below_4g = 0xe0000000; /* default: 3.5G */
         }
-        lowmem = x86ms->max_ram_below_4g;
-        if (machine->ram_size >= x86ms->max_ram_below_4g) {
+        lowmem = pcms->max_ram_below_4g;
+        if (machine->ram_size >= pcms->max_ram_below_4g) {
             if (pcmc->gigabyte_align) {
                 if (lowmem > 0xc0000000) {
                     lowmem = 0xc0000000;
@@ -140,7 +140,7 @@  static void pc_init1(MachineState *machine,
                     warn_report("Large machine and max_ram_below_4g "
                                 "(%" PRIu64 ") not a multiple of 1G; "
                                 "possible bad performance.",
-                                x86ms->max_ram_below_4g);
+                                pcms->max_ram_below_4g);
                 }
             }
         }
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 4ba8ac8774e4..90e8fb2cb737 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -154,18 +154,18 @@  static void pc_q35_init(MachineState *machine)
     /* Handle the machine opt max-ram-below-4g.  It is basically doing
      * min(qemu limit, user limit).
      */
-    if (!x86ms->max_ram_below_4g) {
-        x86ms->max_ram_below_4g = 4 * GiB;
+    if (!pcms->max_ram_below_4g) {
+        pcms->max_ram_below_4g = 4 * GiB;
     }
-    if (lowmem > x86ms->max_ram_below_4g) {
-        lowmem = x86ms->max_ram_below_4g;
+    if (lowmem > pcms->max_ram_below_4g) {
+        lowmem = pcms->max_ram_below_4g;
         if (machine->ram_size - lowmem > lowmem &&
             lowmem & (1 * GiB - 1)) {
             warn_report("There is possibly poor performance as the ram size "
                         " (0x%" PRIx64 ") is more then twice the size of"
                         " max-ram-below-4g (%"PRIu64") and"
                         " max-ram-below-4g is not a multiple of 1G.",
-                        (uint64_t)machine->ram_size, x86ms->max_ram_below_4g);
+                        (uint64_t)machine->ram_size, pcms->max_ram_below_4g);
         }
     }
 
diff --git a/hw/i386/x86.c b/hw/i386/x86.c
index 7a3bc7ab6639..49884e5c1597 100644
--- a/hw/i386/x86.c
+++ b/hw/i386/x86.c
@@ -846,45 +846,6 @@  void x86_bios_rom_init(MemoryRegion *rom_memory, bool isapc_ram_fw)
                                 bios);
 }
 
-static void x86_machine_get_max_ram_below_4g(Object *obj, Visitor *v,
-                                             const char *name, void *opaque,
-                                             Error **errp)
-{
-    X86MachineState *x86ms = X86_MACHINE(obj);
-    uint64_t value = x86ms->max_ram_below_4g;
-
-    visit_type_size(v, name, &value, errp);
-}
-
-static void x86_machine_set_max_ram_below_4g(Object *obj, Visitor *v,
-                                             const char *name, void *opaque,
-                                             Error **errp)
-{
-    X86MachineState *x86ms = X86_MACHINE(obj);
-    Error *error = NULL;
-    uint64_t value;
-
-    visit_type_size(v, name, &value, &error);
-    if (error) {
-        error_propagate(errp, error);
-        return;
-    }
-    if (value > 4 * GiB) {
-        error_setg(&error,
-                   "Machine option 'max-ram-below-4g=%"PRIu64
-                   "' expects size less than or equal to 4G", value);
-        error_propagate(errp, error);
-        return;
-    }
-
-    if (value < 1 * MiB) {
-        warn_report("Only %" PRIu64 " bytes of RAM below the 4GiB boundary,"
-                    "BIOS may not work with less than 1MiB", value);
-    }
-
-    x86ms->max_ram_below_4g = value;
-}
-
 bool x86_machine_is_smm_enabled(X86MachineState *x86ms)
 {
     bool smm_available = false;
@@ -958,7 +919,6 @@  static void x86_machine_initfn(Object *obj)
 
     x86ms->smm = ON_OFF_AUTO_AUTO;
     x86ms->acpi = ON_OFF_AUTO_AUTO;
-    x86ms->max_ram_below_4g = 0; /* use default */
     x86ms->smp_dies = 1;
 
     x86ms->apicid_from_cpu_idx = x86_apicid_from_cpu_idx;
@@ -980,12 +940,6 @@  static void x86_machine_class_init(ObjectClass *oc, void *data)
     x86mc->save_tsc_khz = true;
     nc->nmi_monitor_handler = x86_nmi;
 
-    object_class_property_add(oc, X86_MACHINE_MAX_RAM_BELOW_4G, "size",
-        x86_machine_get_max_ram_below_4g, x86_machine_set_max_ram_below_4g,
-        NULL, NULL);
-    object_class_property_set_description(oc, X86_MACHINE_MAX_RAM_BELOW_4G,
-        "Maximum ram below the 4G boundary (32bit boundary)");
-
     object_class_property_add(oc, X86_MACHINE_SMM, "OnOffAuto",
         x86_machine_get_smm, x86_machine_set_smm,
         NULL, NULL);
diff --git a/hw/i386/xen/xen-hvm.c b/hw/i386/xen/xen-hvm.c
index 82ece6b9e739..d6f4674418e9 100644
--- a/hw/i386/xen/xen-hvm.c
+++ b/hw/i386/xen/xen-hvm.c
@@ -203,7 +203,7 @@  static void xen_ram_init(PCMachineState *pcms,
     ram_addr_t block_len;
     uint64_t user_lowmem =
         object_property_get_uint(qdev_get_machine(),
-                                 X86_MACHINE_MAX_RAM_BELOW_4G,
+                                 PC_MACHINE_MAX_RAM_BELOW_4G,
                                  &error_abort);
 
     /* Handle the machine opt max-ram-below-4g.  It is basically doing