From beb8650b34906da8f87e07238ab33aa8ffc54a67 Mon Sep 17 00:00:00 2001
From: "Michael S. Tsirkin" <mst@redhat.com>
Date: Thu, 18 Sep 2014 16:32:07 +0300
Subject: [PATCH] pc: leave more space for BIOS allocations

Since QEMU 2.1, we are allocating more space for ACPI tables, so no
space is left after initrd for the BIOS to allocate memory.

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.

Move initrd to leave some space for the BIOS.

Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reported-by: John Snow <jsnow@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
(cherry picked from commit 438f92ee9f6a4f78f8adcc399809e252b6da72a2)
---
 hw/i386/pc.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index 97932a6..ef9fad8 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -72,8 +72,10 @@
 #define DPRINTF(fmt, ...)
 #endif
 
-/* Leave a chunk of memory at the top of RAM for the BIOS ACPI tables.  */
-unsigned acpi_data_size = 0x20000;
+/* Leave a chunk of memory at the top of RAM for the BIOS ACPI tables
+ * (128K) and other BIOS datastructures (less than 4K reported to be used at
+ * the moment, 32K should be enough for a while).  */
+unsigned acpi_data_size = 0x20000 + 0x8000;
 void pc_set_legacy_acpi_data_size(void)
 {
     acpi_data_size = 0x10000;