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Re: [Xen-devel] Can't see more than 3.5GB of RAM

To: "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>
From: Jonathan Tripathy <jonnyt@xxxxxxxxxxx>
Date: Thu, 23 Aug 2012 01:11:43 +0100
Delivery-date: Thu, 23 Aug 2012 00:12:15 +0000
List-id: Xen developer discussion <xen-devel.lists.xen.org>

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 xenversion.


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@xxxxxxxxxxxxx) (gcc version 4.6.3 (Ubuntu/Linaro4.6.3-1ubuntu5) ) 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 AMI10013)(XEN) ACPI: FACP DDFA90D8, 00F4 (r4 SUPERM SMCI--MB 1 AMI10013)(XEN) ACPI: DSDT DDF9E1D8, AEFA (r2 SUPERM SMCI--MB 0 INTL20051117)

(XEN) ACPI: FACS DDFBDF80, 0040

(XEN) ACPI: APIC DDFA91D0, 0092 (r3 SUPERM SMCI--MB 1 AMI10013)(XEN) ACPI: FPDT DDFA9268, 0044 (r1 SUPERM SMCI--MB 1 AMI10013)(XEN) ACPI: MCFG DDFA92B0, 003C (r1 SUPERM SMCI--MB 1MSFT 97)(XEN) ACPI: PRAD DDFA92F0, 00BE (r2 PRADID PRADTID 1 MSFT3000001)(XEN) ACPI: HPET DDFA93B0, 0038 (r1 SUPERM SMCI--MB 1AMI. 5)(XEN) ACPI: SSDT DDFA93E8, 036D (r1 SataRe SataTabl 1000 INTL20091112)(XEN) ACPI: SPMI DDFA9758, 0040 (r5 A M I OEMSPMI 0AMI. 0)(XEN) ACPI: SSDT DDFA9798, 09A4 (r1 PmRef Cpu0Ist 3000 INTL20051117)(XEN) ACPI: SSDT DDFAA140, 0A88 (r1 PmRef CpuPm 3000 INTL20051117)(XEN) ACPI: DMAR DDFAABC8, 0078 (r1 INTEL SNB 1INTL 1)(XEN) ACPI: BGRT DDFAAC40, 0038 (r0 SUPERM SMCI--MB 1 AMI10013)(XEN) ACPI: SPCR DDFAAC78, 0050 (r1 A M I APTIO4 1AMI. 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 memorybase = dde16000 end = dde32fff; iommu_inclusive_mapping=1 parametermay 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 pagesto 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 switchinput 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 issueI'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 officialpatch in the works?


Thanks

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- [Xen-devel] Can't see more than 3.5GB of RAM
  - From: Jonathan Tripathy

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