Re: [PATCH REPOST v3 00/80] refactor main RAM allocation to use hostmem backend

[Laurent Vivier]

Le 23/01/2020 à 12:37, Igor Mammedov a écrit :
> 
> v3:
>   - due to libvirt not being ready, postpone till 5.1
>      * [PATCH v2 82/86] numa: forbid '-numa node,  mem' for 5.0 and newer 
> machine types
>      and depended
>        [PATCH v2 86/86] numa: remove deprecated implicit RAM distribution  
> between nodes
>   - drop as not related "[PATCH v2 85/86] numa: make exit() usage consistent"
>   - drop "[PATCH v2 76/86] post conversion default_ram_id cleanup"
>     so that default memory-backedend won't be created for boards that do not 
> care
>     about -m. Which makes -m optin feature. We should decide  what do in  case
>     board doesn't use -m (but that's out of scope of this series)
>   - use object_register_sugar_prop() instead of hacking compat props directly
>   - simplified/reworked aspeed patches
>   - s/RAM_ADDR_FMT/size_to_str()/
>   - rename 'ram-memdev' property to 'memory-backend'
>   - minor fixes to numa-test
>   - fixes for issues noticed during review of
>        [PATCH v2 66/86] ppc/{ppc440_bamboo,sam460x}: drop RAM size fixup
> 
> v2:
>   - fix compile errors on mingw32 host by introducing RAM_ADDR_UFMT [11/86]
>   - replace "[PATCH 43/86] hppa: drop RAM size fixup" with alternative
>     patches made by Philippe (which effectively do the same thing but other
>     way around)
>   - ppc440: fix crash and add suggested valid RAM size in error output.
>     s/ppc4xx_sdram_adjust/ppc4xx_sdram_prep/ and simplify it by removing
>     not necessary nested loop
>   - rebase on current master due to new conflicts
> 
> 
> Series removes ad hoc RAM allocation API 
> (memory_region_allocate_system_memory)
> and consolidates it around hostmem backend. It allows to
>  * resolve conflicts between global -mem-prealloc and hostmem's "policy" 
> option
>    fixing premature allocation before binding policy is applied
>  * simplify complicated memory allocation routines which had to deal with 2 
> ways
>    to allocate RAM.
>  * it allows to reuse hostmem backends of a choice for main RAM without adding
>    extra CLI options to duplicate hostmem features.
>    Recent case was -mem-shared, to enable vhost-user on targets that don't
>    support hostmem backends [1] (ex: s390)
>  * move RAM allocation from individual boards into generic machine code and
>    provide them with prepared MemoryRegion.
>  * clean up deprecated NUMA features which were tied to the old API (see 
> patches)
>     - "numa: remove deprecated -mem-path fallback to anonymous RAM"
>     - (POSTPONED, waiting on libvirt side) "forbid '-numa node,mem' for 5.0 
> and newer machine types"
>     - (POSTPONED) "numa: remove deprecated implicit RAM distribution between 
> nodes"
> 
> Conversion introduces a new machine.memory-backend property and wrapper code 
> that
> aliases global -mem-path and -mem-alloc into automatically created hostmem
> backend properties (provided memory-backend was not set explicitly given by 
> user).
> And then follows bulk of trivial patches that incrementally convert individual
> boards to using machine.memory-backend provided MemoryRegion.
> 
> Board conversion typically involves:
>  * providing MachineClass::default_ram_size and MachineClass::default_ram_id
>    so generic code could create default backend if user didn't explicitly 
> provide
>    memory-backend or -m options
>  * dropping memory_region_allocate_system_memory() call
>  * using convenience MachineState::ram MemoryRegion, which points to 
> MemoryRegion
>    allocated by ram-memdev
> On top of that for some boards:
>  * added missing ram_size checks (typically it were boards with fixed ram 
> size)
>  * ram_size fixups were replaced by checks and hard errors, forcing user to
>    provide correct "-m" values instead of ignoring it and continuing running.
> 
> After all boards are converted the old API is removed and memory allocation
> routines are cleaned up.
> 
> git tree for testing:
>   https://github.com/imammedo/qemu convert_main_ram_to_memdev_v3
> 
> previous rev:
>   https://github.com/imammedo/qemu convert_main_ram_to_memdev_v2
>   https://lists.nongnu.org/archive/html/qemu-devel/2020-01/msg02960.html
> 
> 
> Igor Mammedov (77):
>   numa: remove deprecated -mem-path fallback to anonymous RAM
>   machine: introduce memory-backend property
>   machine: alias -mem-path and -mem-prealloc into memory-foo backend
>   machine: introduce convenience MachineState::ram
>   initialize MachineState::ram in NUMA case
>   alpha:dp264: use memdev for RAM
>   arm/aspeed: actually check RAM size
>   arm/aspeed: use memdev for RAM
>   arm/collie: use memdev for RAM
>   arm/cubieboard: use memdev for RAM
>   arm/digic_boards: use memdev for RAM
>   arm/highbank: use memdev for RAM
>   arm/imx25_pdk: drop RAM size fixup
>   arm/imx25_pdk: use memdev for RAM
>   arm/integratorcp: use memdev for RAM
>   arm/kzm: drop RAM size fixup
>   arm/kzm: use memdev for RAM
>   arm/mcimx6ul-evk: use memdev for RAM
>   arm/mcimx7d-sabre: use memdev for RAM
>   arm/mps2-tz: use memdev for RAM
>   arm/mps2: use memdev for RAM
>   arm/musicpal: use memdev for RAM
>   arm/nseries: use memdev for RAM
>   arm/omap_sx1: use memdev for RAM
>   arm/palm: use memdev for RAM
>   arm/raspi: use memdev for RAM
>   arm/sabrelite: use memdev for RAM
>   arm/sbsa-ref: use memdev for RAM
>   arm/versatilepb: use memdev for RAM
>   arm/vexpress: use memdev for RAM
>   arm/virt: use memdev for RAM
>   arm/xilinx_zynq: drop RAM size fixup
>   arm/xilinx_zynq: use memdev for RAM
>   arm/xlnx-versal-virt: use memdev for RAM
>   arm/xlnx-zcu102: use memdev for RAM
>   s390x/s390-virtio-ccw: use memdev for RAM
>   null-machine: use memdev for RAM
>   cris/axis_dev88: use memdev for RAM
>   hppa: use memdev for RAM
>   x86/microvm: use memdev for RAM
>   x86/pc: use memdev for RAM
>   lm32/lm32_boards: use memdev for RAM
>   lm32/milkymist: use memdev for RAM
>   m68k/an5206: use memdev for RAM
>   m68k/mcf5208: use memdev for RAM
>   m68k/next-cube: use memdev for RAM
>   mips/boston-cube: use memdev for RAM
>   mips/mips_fulong2e: drop RAM size fixup
>   mips/mips_fulong2e: use memdev for RAM
>   mips/mips_jazz: use memdev for RAM
>   mips/mips_malta: use memdev for RAM
>   mips/mips_mipssim: use memdev for RAM
>   mips/mips_r4k: use memdev for RAM
>   ppc/e500: drop RAM size fixup
>   ppc/e500: use memdev for RAM
>   ppc/mac_newworld: use memdev for RAM
>   ppc/mac_oldworld: use memdev for RAM
>   ppc/pnv: use memdev for RAM
>   ppc/ppc405_boards: add RAM size checks
>   ppc/ppc405_boards: use memdev for RAM
>   ppc/{ppc440_bamboo,sam460ex}: drop RAM size fixup
>   ppc/{ppc440_bamboo, sam460ex}: use memdev for RAM
>   ppc/prep: use memdev for RAM
>   ppc/spapr: use memdev for RAM
>   ppc/virtex_ml507: remove unused arguments
>   ppc/virtex_ml507: use memdev for RAM
>   sparc/leon3: use memdev for RAM
>   sparc/sun4m: use memdev for RAM
>   sparc/niagara: use memdev for RAM
>   remove no longer used memory_region_allocate_system_memory()
>   exec: cleanup qemu_minrampagesize()/qemu_maxrampagesize()
>   exec: drop bogus mem_path from qemu_ram_alloc_from_fd()
>   make mem_path local variable
>   hostmem: introduce "prealloc-threads" property
>   hostmem: fix strict bind policy
>   tests:numa-test: make top level args dynamic and g_autofree(cli)
>     cleanups
>   tests:numa-test: use explicit memdev to specify node RAM
> 
> Philippe Mathieu-Daudé (3):
>   hw/hppa/machine: Correctly check the firmware is in PDC range
>   hw/hppa/machine: Restrict the total memory size to 3GB
>   hw/hppa/machine: Map the PDC memory region with higher priority
> 
>  hw/alpha/alpha_sys.h          |   2 +-
>  include/hw/boards.h           |  48 +++++----------
>  include/hw/misc/aspeed_sdmc.h |   1 +
>  include/hw/ppc/ppc4xx.h       |   9 ++-
>  include/sysemu/hostmem.h      |  20 +++++-
>  include/sysemu/numa.h         |   1 +
>  include/sysemu/sysemu.h       |   2 -
>  backends/hostmem-file.c       |   8 ---
>  backends/hostmem-memfd.c      |   1 -
>  backends/hostmem-ram.c        |   2 -
>  backends/hostmem.c            |  53 +++++++++++-----
>  exec.c                        |  66 +++-----------------
>  hw/alpha/dp264.c              |   3 +-
>  hw/alpha/typhoon.c            |   8 +--
>  hw/arm/aspeed.c               |  18 +++---
>  hw/arm/collie.c               |  17 ++++--
>  hw/arm/cubieboard.c           |  25 +++-----
>  hw/arm/digic_boards.c         |  40 ++++++------
>  hw/arm/highbank.c             |  10 ++-
>  hw/arm/imx25_pdk.c            |  13 ++--
>  hw/arm/integratorcp.c         |   9 ++-
>  hw/arm/kzm.c                  |  18 +++---
>  hw/arm/mcimx6ul-evk.c         |  25 +++-----
>  hw/arm/mcimx7d-sabre.c        |  25 +++-----
>  hw/arm/mps2-tz.c              |  15 +++--
>  hw/arm/mps2.c                 |  15 +++--
>  hw/arm/musicpal.c             |  18 ++++--
>  hw/arm/nseries.c              |  32 ++++++----
>  hw/arm/omap_sx1.c             |  20 ++++--
>  hw/arm/palm.c                 |  20 ++++--
>  hw/arm/raspi.c                |  34 ++++-------
>  hw/arm/sabrelite.c            |  23 +++----
>  hw/arm/sbsa-ref.c             |   7 +--
>  hw/arm/versatilepb.c          |   7 +--
>  hw/arm/vexpress.c             |  14 ++---
>  hw/arm/virt.c                 |   7 +--
>  hw/arm/xilinx_zynq.c          |  20 +++---
>  hw/arm/xlnx-versal-virt.c     |   7 +--
>  hw/arm/xlnx-zcu102.c          |   7 +--
>  hw/core/machine.c             |  30 +++++++++
>  hw/core/null-machine.c        |   8 +--
>  hw/core/numa.c                | 101 +++++++++----------------------
>  hw/cris/axis_dev88.c          |   8 +--
>  hw/hppa/machine.c             |  19 +++---
>  hw/i386/microvm.c             |  12 ++--
>  hw/i386/pc.c                  |  19 +++---
>  hw/lm32/lm32_boards.c         |  39 ++++++++----
>  hw/lm32/milkymist.c           |  21 ++++---
>  hw/m68k/an5206.c              |   5 +-
>  hw/m68k/mcf5208.c             |   5 +-
>  hw/m68k/next-cube.c           |   5 +-

Could you add hw/m68k/q800.c ?

Thanks,
Laurent