On 11/11/2014 18:13, Paolo Bonzini wrote: > > > On 06/10/2014 16:56, Paolo Bonzini wrote: >> In the emergency last-minute patches of QEMU 2.1 we did two things: >> >> - fixed migration problems from 1.7 or 2.0 to 2.1 due to changes in >> ACPI table sizes >> >> - ensured that future versions will not break migration compatibility >> with 2.2 for reasonable configurations (with ACPI tables smaller >> than a hundred kilobytes, roughly) >> >> However, this came at the cost of wasting 128 KB unconditionally on >> even the smaller configuration, and we didn't provide a mechanism to >> ensure compatibility with larger configurations. >> >> This series provides this mechanism. As mentioned early, the design >> is to consider the SSDT immutable and versioned (together with other >> non-AML tables such as HPET, TPMA and MADT, SRAT, MCFG, DMAR). >> The DSDT instead can change more or less arbitrarily. To do this, >> we add padding after the DSDT to allow for future growth (patch 1). >> >> Once we do this, the size of the ACPI table fw_cfg "file" is constant >> given a machine type and a command-line, so we do not need anymore the >> larger 128KB padding (patch 2). >> >> Patch 3 is just cleanups. >> >> Paolo >> >> v1->v2: drop linuxboot changes, instead modify the option ROM >> in a separate patch >> >> Paolo Bonzini (3): >> pc: introduce new ACPI table sizing algorithm >> pc: go back to smaller ACPI tables >> pc: clean up pre-2.1 compatibility code >> >> hw/i386/acpi-build.c | 20 +++++++++++--------- >> hw/i386/pc_piix.c | 20 +++++++++++++++++++- >> hw/i386/pc_q35.c | 6 ++++-- >> include/hw/i386/pc.h | 2 ++ >> 4 files changed, 36 insertions(+), 12 deletions(-) >> > > Ping?
Ping?? Paolo
