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: NPaolo Bonzini <pbonzini@redhat.com> Reported-by: NJohn Snow <jsnow@redhat.com> Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Showing
想要评论请 注册 或 登录