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[Qemu-stable] [PATCH for-2.1.2] pc: add more padding between the end of
From: |
Paolo Bonzini |
Subject: |
[Qemu-stable] [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 @@
#endif
/* 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;
--
1.8.3.1
- [Qemu-stable] [PATCH for-2.1.2] pc: add more padding between the end of the initrd and the end of memory,
Paolo Bonzini <=