Re: [Xen-devel] Can't see more than 3.5GB of RAM / UEFI / no e820 memory map detected

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Aug 23, 2012 at 12:48:01AM +0100, 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
> 

Yes, this is UEFI related issue. Can you turn UEFI off? 

It looks like you're not running UEFI capable Xen hypervisor.
(Xen 4.2 has UEFI support, and some vendors have backported UEFI support on 
older versions,
for example Suse SLES11SP2 contains Xen support in Xen 4.1).

> Thanks
> 
> Here is the output of xm dmesg:
> 
> (XEN) Xen version 4.1.2 (Ubuntu 4.1.2-2ubuntu2.2)
> (stefan.bader@xxxxxxxxxxxxx) (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

here:

> (XEN) Xen-e801 RAM map:
> (XEN)  0000000000000000 - 0000000000099c00 (usable)
> (XEN)  0000000000100000 - 00000000ddd00000 (usable)

This is the problem - only the legacy e801 memory map is detected here.
You need the usual e820 memory map to see all the memory (correct memory 
layout).

You need Xen with UEFI support, or turn off UEFI in BIOS.


-- Pasi


> (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
> 
> 
> 
> 
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