[Qemu-devel] [PATCH v2] x86: gigabyte alignment for ram

[Gerd Hoffmann <kraxel@redhat.com>]

Map 3G (i440fx) or 2G (q35) of memory below 4G, so the RAM pieces
are nicely aligned to gigabyte borders.

Keep old memory layout for (a) old machine types and (b) in case all
memory fits below 4G and thus we don't have to split RAM into pieces
in the first place.  The later makes sure this change doesn't take
away memory from 32bit guests.

So, with i440fx and up to 3.5 GB of memory, all of it will be mapped
below 4G.  With more than 3.5 GB of memory 3 GB will be mapped below
4G and the remaining amount will be mapped above 4G.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
---
v2: rebased, resolved comflicts, resent as non-rfc
---
 hw/i386/pc_piix.c | 7 +++++--
 hw/i386/pc_q35.c  | 7 +++++--
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c
index 4e0dae7..acb9445 100644
--- a/hw/i386/pc_piix.c
+++ b/hw/i386/pc_piix.c
@@ -61,6 +61,7 @@ static const int ide_irq[MAX_IDE_BUS] = { 14, 15 };
 static bool has_pci_info;
 static bool has_acpi_build = true;
 static bool smbios_type1_defaults = true;
+static bool gigabyte_align = true;
 
 /* PC hardware initialisation */
 static void pc_init1(QEMUMachineInitArgs *args,
@@ -107,8 +108,9 @@ static void pc_init1(QEMUMachineInitArgs *args,
     }
 
     if (args->ram_size >= 0xe0000000) {
-        above_4g_mem_size = args->ram_size - 0xe0000000;
-        below_4g_mem_size = 0xe0000000;
+        ram_addr_t lowmem = gigabyte_align ? 0xc0000000 : 0xe0000000;
+        above_4g_mem_size = args->ram_size - lowmem;
+        below_4g_mem_size = lowmem;
     } else {
         above_4g_mem_size = 0;
         below_4g_mem_size = args->ram_size;
@@ -245,6 +247,7 @@ static void pc_init_pci(QEMUMachineInitArgs *args)
 static void pc_compat_1_7(QEMUMachineInitArgs *args)
 {
     smbios_type1_defaults = false;
+    gigabyte_align = false;
 }
 
 static void pc_compat_1_6(QEMUMachineInitArgs *args)
diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c
index 07f38ff..7104645 100644
--- a/hw/i386/pc_q35.c
+++ b/hw/i386/pc_q35.c
@@ -51,6 +51,7 @@
 static bool has_pci_info;
 static bool has_acpi_build = true;
 static bool smbios_type1_defaults = true;
+static bool gigabyte_align = true;
 
 /* PC hardware initialisation */
 static void pc_q35_init(QEMUMachineInitArgs *args)
@@ -93,8 +94,9 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
     kvmclock_create();
 
     if (args->ram_size >= 0xb0000000) {
-        above_4g_mem_size = args->ram_size - 0xb0000000;
-        below_4g_mem_size = 0xb0000000;
+        ram_addr_t lowmem = gigabyte_align ? 0x80000000 : 0xb0000000;
+        above_4g_mem_size = args->ram_size - lowmem;
+        below_4g_mem_size = lowmem;
     } else {
         above_4g_mem_size = 0;
         below_4g_mem_size = args->ram_size;
@@ -228,6 +230,7 @@ static void pc_q35_init(QEMUMachineInitArgs *args)
 static void pc_compat_1_7(QEMUMachineInitArgs *args)
 {
     smbios_type1_defaults = false;
+    gigabyte_align = false;
 }
 
 static void pc_compat_1_6(QEMUMachineInitArgs *args)
-- 
1.8.3.1