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[Qemu-devel] [PATCH for-2.1.2] pc: add more padding between the end of t

From: Paolo Bonzini
Subject: [Qemu-devel] [PATCH for-2.1.2] pc: add more padding between the end of the initrd and the end of memory
Date: Thu, 18 Sep 2014 18:05:46 +0200

Besides ACPI tables, there are a few other uses of high memory in SeaBIOS:
SMBIOS tables and USB drivers use it in particular.  These uses allocate
a very small amount of memory.  Malloc metadata also lives there.  So we
need _some_ extra padding there to avoid initrd breakage, but not much.

John Snow found a case where RHEL5 was broken by the recent change to
ACPI_TABLE_SIZE; in his case 4KB of extra padding are fine, but just
to be safe I am adding 32KB, which is roughly the same amount of
padding that was left by QEMU 2.0 and earlier.

Signed-off-by: Paolo Bonzini <address@hidden>
 hw/i386/pc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 77b6782..b9d4be7 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -73,7 +73,7 @@
 /* Leave a chunk of memory at the top of RAM for the BIOS ACPI tables.  */
-unsigned acpi_data_size = 0x20000;
+unsigned acpi_data_size = 0x28000;
 void pc_set_legacy_acpi_data_size(void)
     acpi_data_size = 0x10000;

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