[Xen-devel] Re: xen: memory initialization/balloon fixes (#3)

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Thu, Sep 15, 2011 at 01:29:21PM +0100, David Vrabel wrote:
> This set of patches fixes some bugs in the memory initialization under
> Xen and in Xen's memory balloon driver.  They can make 100s of MB of
> additional RAM available (depending on the system/configuration).
> 
> Patch 1 is already applied.
> 
> Patch 2 fixes a bug in patch 1 and should be queued for 3.1 (and along
> with patch 1 considered for 3.0 stable).
> 
> Patch 3 is a bug fix and should be queued for 3.1 and possibly
> queued for the 3.0 stable tree.
> 
> Patches 5 & 6 increase the amount of low memory in 32 bit domains
> started with < 1 GiB of RAM.  Please queue for 3.2
> 
> Patch 7 releases all pages in the initial allocation with PFNs that
> lie within a 1-1 mapping.  This seems correct to me as I think that
> once the 1-1 mapping is set the MFN of the original page is lost so
> it's no longer accessible by the kernel (and it cannot be used by
> another domain
> 
> Changes since #2:
> 
> - New patch: xen: avoid adding non-existant memory if the reservation
>   is unlimited
> - Avoid using a hypercall to get the current number of pages in the
>   ballon driver.  Apparently the hypercall won't return the right
>   value if paging is used.
> - Addresses Konrad's review comments.

They don't work on AMD boxes:

XELINUX 3.82 2009-06-09  Copyright (C) 1994-2009 H. Peter Anvin et al
Loading xen.gz... ok
Loading vmlinuz... ok
Loading initramfs.cpio.gz... ok
 __  __            _  _    _    _ _  ___   __  _____  ___  
 \ \/ /___ _ __   | || |  / |  / / |/ _ \ / /_|___ / / _ \ 
  \  // _ \ '_ \  | || |_ | |__| | | | | | '_ \ |_ \| | | |
  /  \  __/ | | | |__   _|| |__| | | |_| | (_) |__) | |_| |
 /_/\_\___|_| |_|    |_|(_)_|  |_|_|\___/ \___/____/ \___/ 
                                                           
(XEN) Xen version 4.1-110923 (konrad@xxxxxxxxxxxx) (gcc version 4.4.4 20100503 
(Red Hat 4.4.4-2) (GCC) ) Fri Sep 23 19:38:15 EDT 2011
(XEN) Latest ChangeSet: unavailable
(XEN) Console output is synchronous.
(XEN) Bootloader: unknown
(XEN) Command line: com1=115200,8n1 console=com1,vga guest_loglvl=all 
sync_console apic=debug
(XEN) Video information:
(XEN)  VGA is text mode 80x25, font 8x16
(XEN)  VBE/DDC methods: none; EDID transfer time: 2 seconds
(XEN)  EDID info not retrieved because no DDC retrieval method detected
(XEN) Disc information:
(XEN)  Found 0 MBR signatures
(XEN)  Found 0 EDD information structures
(XEN) Xen-e820 RAM map:
(XEN)  0000000000000000 - 000000000009d800 (usable)
(XEN)  000000000009d800 - 00000000000a0000 (reserved)
(XEN)  00000000000cc000 - 0000000000100000 (reserved)
(XEN)  0000000000100000 - 000000007fff0000 (usable)
(XEN)  000000007fff0000 - 0000000080000000 (reserved)
(XEN)  0000000080000000 - 00000000cfef0000 (usable)
(XEN)  00000000cfef0000 - 00000000cfef5000 (ACPI data)
(XEN)  00000000cfef5000 - 00000000cff7f000 (ACPI NVS)
(XEN)  00000000cff80000 - 00000000d0000000 (reserved)
(XEN)  00000000e0000000 - 00000000f0000000 (reserved)
(XEN)  00000000fec00000 - 00000000fec10000 (reserved)
(XEN)  00000000fee00000 - 00000000fee01000 (reserved)
(XEN)  00000000fff80000 - 0000000100000000 (reserved)
(XEN)  0000000100000000 - 0000000130000000 (usable)
(XEN) ACPI: RSDP 000F79B0, 0024 (r2 PTLTD )
(XEN) ACPI: XSDT CFEF0753, 009C (r1 DELL   PE_SC3    6040000 DELL        0)
(XEN)  DELL   PE_SC3    6040000 MSFT  100000E)
(XEN) ACPI: FACS CFEF5FC0, 0040
(XEN) ACPI: TCPA CFEF3D53, 0032 (r1 Phoeni  x        6040000  TL         0)
(XEN) ACPI: SLIC CFEF3D85, 0024 (r1 DELL   PE_SC3    6040000 PTL         1)
(XEN) ACPI: SPCR CFEF3DA9, 0050 (r1 DELL   PE_SC3    6040000 PTL         1)
(XEN) ACPI: EINJ CFEF3DF9, 01B0 (r1 PTL    WHEAPTL   6040000 PTL         1)
(XEN) ACPI: HEST CFEF3FA9, 00A8 (r1 PTL    WHEAPTL   6040000 PTL         1)
(XEN) ACPI: BERT CFEF4051, 0030 (r1 PTL    WHEAPTL   6040000 PTL         1)
(XEN) ACPI: SSDT CFEF4081, 00E1 (r1 wheaos  wheaosc  6040000 INTL 20050624)
(XEN) ACPI: ERST CFEF4162, 0270 (r1 PTL    WHEAPTL   6040000 PTL         1)
(XEN) ACPI: SRAT CFEF43D2, 00E8 (r1 AMD    HAMMER    6040000 AMD         1)
(XEN) ACPI: SSDT CFEF44BA, 0A30 (r1 AMD    POWERNOW  6040000 AMD         1)
(XEN) ACPI: MCFG CFEF4EEA, 003C (r1 PTLTD    MCFG    6040000  LTP        0)
(XEN) ACPI: HPET CFEF4F26, 0038 (r1 PTLTD  HPETTBL   6040000  LTP        1)
(XEN) ACPI: APIC CFEF4F5E, 007A (r1 PTLTD    APIC    6040000  LTP        0)
(XEN) ACPI: BOOT CFEF4FD8, 0028 (r1 PTLTD  $SBFTBL$  6040000  LTP        1)
(XEN) System RAM: 4094MB (4192756kB)
(XEN) Domain heap initialised
(XEN) Processor #0 0:2 APIC version 16
(XEN) Processor #1 0:2 APIC version 16
(XEN) Processor #2 0:2 APIC version 16
(XEN) Processor #3 0:2 APIC version 16
(XEN) IOAPIC[0]: apic_id 4, version 17, address 0xfec00000, GSI 0-23
(XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
(XEN) ERST table is invalid
(XEN) Using scheduler: SMP Credit Scheduler (credit)
(XEN) Detected 2109.743 MHz processor.
(XEN) Initing memory sharing.
(XEN) AMD-Vi: IOMMU not found!
(XEN) I/O virtualisation disabled
(XEN) ENABLING IO-APIC IRQs
(XEN)  -> Using new ACK method
(XEN) Platform timer is 25.000MHz HPET
ï(XEN) Allocated console ring of 16 KiB.
(XEN) HVM: ASIDs enabled.
(XEN) SVM: Support(XEN) Brought up 4 CPUs
(XEN) *** LOADING DOMAIN 0 ***
(XEN)  Xen  kernel: 64-bit, lsb, compat32
(XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x202f000
(XEN) PHYSICAL MEY ARRANGEMENT:
(XEN)  Dom0 alloc.:   0000000118000000->000000011c000000 (926244 pages to be 
allocated)
(XEN)  Init. ramdisk: 00000001216cc000->000000012ffffc00
(XEN) VIRTUAL MEMORY ARRANGEMENT:
(XEN)  Loaded kernel: ffffffff81000000->ffffffff8202f000
(XEN)  Init. ramdisk: ffffffff8202f000->ffffffff90962c00
(XEN)  Phys-Mach map: ffffffff90963000->ffffffff91108ac0
(XEN)  Start info:    ffffffff91109000->ffffffff911094b4
(XEN)  Page tables:   ffffffff9110a000->ffffffff91197000
(XEN)  Boot stack:    ffffffff91197000->ffffffff91198000
(XEN)  TOTAL:         ffffffff80000000->ffffffff91400000
(XEN)  ENTRY ADDRESS: ffffffff81aeb200
(XEN) Dom0 has maximum 4 VCPUs
(XEN) Scrubbing Free RAM: .done.
(XEN) Xen trace buffers: disabled
(XEN) Std. Loglevel: Errors and warnings
(XEN) Guest Loglevel: All
(XEN) **********************************************
(XEN) ******* WARNING: CONSOLE OUTPUT IS SYNCHRONOUS
(XEN) ******* This option is intended to aid debugging of Xen by ensuring
(XEN) ******* that all output is synchronously delivered on the serial line.
(XEN) ******* However it can introduce SIGNIFICANT latencies and affect
(XEN) ******* timekeeping. It is NOT recommended for production use!
(XEN) **********************************************
(XEN) 3... 2... 1... 
(XEN) Xen is relinquishing VGA console.
(XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch input to 
Xen)
(XEN) Freed 228kB init memory.
mapping kernel into physical memory
Xen: setup ISA identity maps
about to get started...

and then it is just stuck.. This is v3.1-rc7 + your patches

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