On Wed, Aug 20, 2014 at 12:27 PM, Michael S. Tsirkin <m...@redhat.com> wrote: > On Wed, Aug 20, 2014 at 11:27:41AM +0100, Stefan Hajnoczi wrote: >> The QEMU -initrd option loads the initrd at the top of RAM. There is >> a 64 KB safety region for ACPI tables in hw/i386/pc.c:load_linux(): >> >> initrd_max = max_ram_size-ACPI_DATA_SIZE-1; >> >> QEMU's bios-256k.bin SeaBIOS build reserves 128 KB at the top of >> memory so the 64 KB ACPI data size has become too small. >> >> The guest Linux kernel rejects the initrd: >> BIOS-provided physical RAM map: >> BIOS-e820: 0000000000010000 - 000000000009fc00 (usable) >> BIOS-e820: 000000000009fc00 - 00000000000a0000 (reserved) >> BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) >> BIOS-e820: 0000000000100000 - 000000003ffe0000 (usable) >> BIOS-e820: 000000003ffe0000 - 0000000040000000 (reserved) >> BIOS-e820: 00000000feffc000 - 00000000ff000000 (reserved) >> BIOS-e820: 00000000fffc0000 - 0000000100000000 (reserved) >> ... >> initrd extends beyond end of memory (0x3ffef79f > 0x3ffe0000) >> disabling initrd >> >> It is easy enough to "fix" the problem by bumping ACPI_DATA_SIZE up to >> 0x20000 in QEMU. Perhaps this should only be done for bios-256k.bin >> guests and not bios-128k.bin guests (QEMU 1.7 and older machine >> types). >> >> Perhaps QEMU -> SeaBIOS -> linuxboot.bin can be simplified so QEMU >> doesn't have to guess what e820 region SeaBIOS will reserve. >> linuxboot.bin would probably be the place to do it unless SeaBIOS has >> Linux loading functionality that could be reused. >> >> Any ideas? >> >> Stefan > > I would say 2.1 and up, -M pc-i440fx-2.0 works fine, or am I mistaken?
pc-i440fx-2.0 works fine. pc-i440fx-2.1 does not. Stefan
