haraldwolff/qemu-patch-raspberry4
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pc: leave more space for BIOS allocations

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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>
This commit is contained in:
Michael S. Tsirkin 2014-09-18 16:32:07 +03:00
parent 4d43d3f3c8
commit 438f92ee9f
1 changed files with 4 additions and 2 deletions
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6
hw/i386/pc.c
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@ -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;