Re: Can't see more than 3.5GB of RAM

[Jonathan Tripathy <jonnyt@abpni.co.uk>]

On 23/08/2012 00:48, Jonathan Tripathy wrote:
>
> Hi Everyone,
>
> CC: Xen-users
>
> I am running Ubuntu 12.04 x86_64. My machine has a supermicro
> motherboard X9SCI-LN4F with 32GB of RAM installed. To get Xen, I simply
> did apt-get install xen-hypervisor which gives me Ubuntu's 4.1 xen 
> version.
>
> For some reason, Xen can't see any more than about 3.5GB of RAM. I can
> confirm this by xentop as well as xm info. I am definately running a
> 64-bit Dom0 kernel as when I boot into it without Xen, I can see all
> 32GB of RAM by running "free -m".
>
> Has anybody come across this issue before? For what it's worth, I'm
> booting my system using UEFI - could that have something to do with it?
>
> Any help is very much appreciated
>
> Thanks
>
> Here is the output of xm dmesg:
>
> (XEN) Xen version 4.1.2 (Ubuntu 4.1.2-2ubuntu2.2) 
> (stefan.bader@canonical.com) (gcc version 4.6.3 (Ubuntu/Linaro 
> 4.6.3-1ubuntu5) ) Sat Jul 21 09:01:19 UTC 2012
> (XEN) Bootloader: GRUB 1.99-21ubuntu3.1
> (XEN) Command line: placeholder
> (XEN) Video information:
> (XEN)  VGA is text mode 80x25, font 8x16
> (XEN)  VBE/DDC methods: V2; EDID transfer time: 1 seconds
> (XEN) Disc information:
> (XEN)  Found 0 MBR signatures
> (XEN)  Found 0 EDD information structures
> (XEN) Xen-e801 RAM map:
> (XEN)  0000000000000000 - 0000000000099c00 (usable)
> (XEN)  0000000000100000 - 00000000ddd00000 (usable)
> (XEN) System RAM: 3548MB (3633764kB)
> (XEN) ACPI: RSDP 000FDF00, 0024 (r2 SUPERM)
> (XEN) ACPI: XSDT DDF9E098, 00AC (r1 SUPERM SMCI--MB        1 AMI     
> 10013)
> (XEN) ACPI: FACP DDFA90D8, 00F4 (r4 SUPERM SMCI--MB        1 AMI     
> 10013)
> (XEN) ACPI: DSDT DDF9E1D8, AEFA (r2 SUPERM SMCI--MB        0 INTL 
> 20051117)
> (XEN) ACPI: FACS DDFBDF80, 0040
> (XEN) ACPI: APIC DDFA91D0, 0092 (r3 SUPERM SMCI--MB        1 AMI     
> 10013)
> (XEN) ACPI: FPDT DDFA9268, 0044 (r1 SUPERM SMCI--MB        1 AMI     
> 10013)
> (XEN) ACPI: MCFG DDFA92B0, 003C (r1 SUPERM SMCI--MB        1 
> MSFT       97)
> (XEN) ACPI: PRAD DDFA92F0, 00BE (r2 PRADID  PRADTID        1 MSFT 
> 3000001)
> (XEN) ACPI: HPET DDFA93B0, 0038 (r1 SUPERM SMCI--MB        1 
> AMI.        5)
> (XEN) ACPI: SSDT DDFA93E8, 036D (r1 SataRe SataTabl     1000 INTL 
> 20091112)
> (XEN) ACPI: SPMI DDFA9758, 0040 (r5 A M I   OEMSPMI        0 
> AMI.        0)
> (XEN) ACPI: SSDT DDFA9798, 09A4 (r1  PmRef  Cpu0Ist     3000 INTL 
> 20051117)
> (XEN) ACPI: SSDT DDFAA140, 0A88 (r1  PmRef    CpuPm     3000 INTL 
> 20051117)
> (XEN) ACPI: DMAR DDFAABC8, 0078 (r1 INTEL      SNB         1 
> INTL        1)
> (XEN) ACPI: BGRT DDFAAC40, 0038 (r0 SUPERM SMCI--MB        1 AMI     
> 10013)
> (XEN) ACPI: SPCR DDFAAC78, 0050 (r1  A M I   APTIO4        1 
> AMI.        5)
> (XEN) ACPI: EINJ DDFAACC8, 0130 (r1    AMI AMI EINJ 0 0)
> (XEN) ACPI: ERST DDFAADF8, 0210 (r1  AMIER AMI ERST 0 0)
> (XEN) ACPI: HEST DDFAB008, 00A8 (r1    AMI AMI HEST 0 0)
> (XEN) ACPI: BERT DDFAB0B0, 0030 (r1    AMI AMI BERT 0 0)
> (XEN) Domain heap initialised
> (XEN) ACPI: 32/64X FACS address mismatch in FADT - 
> ddfbdf80/0000000000000000, using 32
> (XEN) Processor #0 7:10 APIC version 21
> (XEN) Processor #2 7:10 APIC version 21
> (XEN) Processor #4 7:10 APIC version 21
> (XEN) Processor #6 7:10 APIC version 21
> (XEN) Processor #1 7:10 APIC version 21
> (XEN) Processor #3 7:10 APIC version 21
> (XEN) Processor #5 7:10 APIC version 21
> (XEN) Processor #7 7:10 APIC version 21
> (XEN) IOAPIC[0]: apic_id 2, version 32, address 0xfec00000, GSI 0-23
> (XEN) Enabling APIC mode:  Flat.  Using 1 I/O APICs
> (XEN) [VT-D]dmar.c:528:   RMRR address range not in reserved memory 
> base = dde16000 end = dde32fff; iommu_inclusive_mapping=1 parameter 
> may be needed.
> (XEN) ERST table is invalid
> (XEN) Switched to APIC driver x2apic_cluster.
> (XEN) Using scheduler: SMP Credit Scheduler (credit)
> (XEN) Detected 3292.644 MHz processor.
> (XEN) Initing memory sharing.
> (XEN) Intel VT-d Snoop Control enabled.
> (XEN) Intel VT-d Dom0 DMA Passthrough not enabled.
> (XEN) Intel VT-d Queued Invalidation enabled.
> (XEN) Intel VT-d Interrupt Remapping enabled.
> (XEN) Intel VT-d Shared EPT tables not enabled.
> (XEN) I/O virtualisation enabled
> (XEN)  - Dom0 mode: Relaxed
> (XEN) Enabled directed EOI with ioapic_ack_old on!
> (XEN) ENABLING IO-APIC IRQs
> (XEN)  -> Using old ACK method
> (XEN) Platform timer is 14.318MHz HPET
> (XEN) Allocated console ring of 16 KiB.
> (XEN) VMX: Supported advanced features:
> (XEN)  - APIC MMIO access virtualisation
> (XEN)  - APIC TPR shadow
> (XEN)  - Extended Page Tables (EPT)
> (XEN)  - Virtual-Processor Identifiers (VPID)
> (XEN)  - Virtual NMI
> (XEN)  - MSR direct-access bitmap
> (XEN)  - Unrestricted Guest
> (XEN) EPT supports 2MB super page.
> (XEN) HVM: ASIDs enabled.
> (XEN) HVM: VMX enabled
> (XEN) HVM: Hardware Assisted Paging detected.
> (XEN) Brought up 8 CPUs
> (XEN) *** LOADING DOMAIN 0 ***
> (XEN)  Xen  kernel: 64-bit, lsb, compat32
> (XEN)  Dom0 kernel: 64-bit, PAE, lsb, paddr 0x1000000 -> 0x205d000
> (XEN) PHYSICAL MEMORY ARRANGEMENT:
> (XEN)  Dom0 alloc.:   00000000bc000000->00000000c0000000 (744642 pages 
> to be allocated)
> (XEN)  Init. ramdisk: 00000000c4b6a000->00000000dd7ffe00
> (XEN) VIRTUAL MEMORY ARRANGEMENT:
> (XEN)  Loaded kernel: ffffffff81000000->ffffffff8205d000
> (XEN)  Init. ramdisk: ffffffff8205d000->ffffffff9acf2e00
> (XEN)  Phys-Mach map: ffffffff9acf3000->ffffffff9b387ac0
> (XEN)  Start info:    ffffffff9b388000->ffffffff9b3884b4
> (XEN)  Page tables:   ffffffff9b389000->ffffffff9b468000
> (XEN)  Boot stack:    ffffffff9b468000->ffffffff9b469000
> (XEN)  TOTAL:         ffffffff80000000->ffffffff9b800000
> (XEN)  ENTRY ADDRESS: ffffffff81cfd200
> (XEN) Dom0 has maximum 8 VCPUs
> (XEN) Scrubbing Free RAM: .done.
> (XEN) Xen trace buffers: disabled
> (XEN) Std. Loglevel: Errors and warnings
> (XEN) Guest Loglevel: Nothing (Rate-limited: Errors and warnings)
> (XEN) Xen is relinquishing VGA console.
> (XEN) *** Serial input -> DOM0 (type 'CTRL-a' three times to switch 
> input to Xen)
> (XEN) Freed 220kB init memory.
> (XEN) physdev.c:155: dom0: wrong map_pirq type 3
>
>
>

Hi Everyone,

You will note that someone has posted a bug report here with the issue 
I'm facing:

https://bugzilla.redhat.com/show_bug.cgi?id=819235

Also, someone has create a patch (for 4.0.1): 
http://serverfault.com/questions/342109/xen-only-sees-512mb-of-system-ram-should-be-8gb-uefi-boot

Could someone here please shed light on this issue? Is there an official 
patch in the works?

Thanks