The current way we organize the IO windows into PCI space for the pseries machine type has several problems.
- It makes it difficult to create very large MMIO spaces which is necessary for certain PCI devices with very large BARs. This problem has been known for a while. - More recently we discovered a more serious problem: it prevents more than 1TiB of RAM being added to a pseries guest. - It doesn't make very efficient use of address space. Fixing this is complicated by keeping migration from old versionss working and working out what things belong on which side of the abstraction barrier between the machine type and the host bridge device. This series addresses all these problems. Patches 1-3/7 perform preliminary cleanups to the spapr specific PCI test code, which we'll need to get the tests working with the changed implementation. 4-5/7 represent a minimal fix for the most serious problem (the 1 TiB limit) - once polished, I'll consider submiting these for the stable branch. 6-7/7 complete a more comprehensive fix. Changes since v2: * Removed window sizes from placement callback. Having them in there led to a small behavioural change that wasn't intended * Adjusted / added some comments for clarity. Changes since v1: * Removed a debugging printf() Changes since RFC: * Rebase * Fixed some bugs * Fixed up PCI testcases which were broken by the change (due to test limitations) * Seriously contemplated, then rejected a completely different approach *** BLURB HERE *** David Gibson (7): libqos: Isolate knowledge of spapr memory map to qpci_init_spapr() libqos: Correct error in PCI hole sizing for spapr libqos: Limit spapr-pci to 32-bit MMIO for now spapr_pci: Delegate placement of PCI host bridges to machine type spapr: Adjust placement of PCI host bridge to allow > 1TiB RAM spapr_pci: Add a 64-bit MMIO window spapr: Improved placement of PCI host bridges in guest memory map hw/ppc/spapr.c | 119 +++++++++++++++++++++++++++++++++++++++++++- hw/ppc/spapr_pci.c | 90 +++++++++++++++++++++++---------- include/hw/pci-host/spapr.h | 25 +++++----- include/hw/ppc/spapr.h | 4 ++ tests/endianness-test.c | 3 +- tests/libqos/pci-spapr.c | 116 +++++++++++++++++++++++------------------- tests/spapr-phb-test.c | 2 +- 7 files changed, 265 insertions(+), 94 deletions(-) -- 2.7.4