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Date: Tue, 05 Apr 2016 02:09:34 -0000
From: changlimin <changlimin@h3c.com>
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Subject: [Qemu-devel] [Bug 1562653] Re: Ubuntu 15.10: QEMU VM hang if memory
	>= 1T
Reply-To: Bug 1562653 <1562653@bugs.launchpad.net>
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To: qemu-devel@nongnu.org

For cpus which have not EPT feature, should change
CR3_L_MODE_RESERVED_BITS in arch/x86/include/asm/kvm_host.h:

-#define CR3_L_MODE_RESERVED_BITS 0xFFFFFF0000000000ULL
+#define CR3_L_MODE_RESERVED_BITS 0xFFFFFE0000000000ULL

-- =

You received this bug notification because you are a member of qemu-
devel-ml, which is subscribed to QEMU.
https://bugs.launchpad.net/bugs/1562653

Title:
  Ubuntu 15.10: QEMU VM hang if memory >=3D 1T

Status in QEMU:
  New
Status in qemu package in Ubuntu:
  Incomplete

Bug description:
  1. Ubuntu 15.10 x86_64 installed on HP SuperDome X with 8CPUs and 4T
  memory.

  2. Create a VM, install Ubuntu 15.10, if memory >=3D 1T , VM hang when st=
art. If memory < 1T, it is good.
  <domain type=3D'kvm'>
    <name>u1510-1</name>
    <uuid>39eefe1e-4829-4843-b892-026d143f3ec7</uuid>
    <memory unit=3D'KiB'>1073741824</memory>
    <currentMemory unit=3D'KiB'>1073741824</currentMemory>
    <vcpu placement=3D'static'>16</vcpu>
    <os>
      <type arch=3D'x86_64' machine=3D'pc-i440fx-2.3'>hvm</type>
      <boot dev=3D'hd'/>
      <boot dev=3D'cdrom'/>
    </os>
    <features>
      <acpi/>
      <apic/>
      <pae/>
    </features>
    <clock offset=3D'utc'/>
    <on_poweroff>destroy</on_poweroff>
    <on_reboot>restart</on_reboot>
    <on_crash>restart</on_crash>
    <devices>
      <emulator>/usr/bin/kvm</emulator>
      <disk type=3D'file' device=3D'disk'>
        <driver name=3D'qemu' type=3D'qcow2' cache=3D'directsync'/>
        <source file=3D'/vms/images/u1510-1.img'/>
        <target dev=3D'vda' bus=3D'virtio'/>
        <address type=3D'pci' domain=3D'0x0000' bus=3D'0x00' slot=3D'0x08' =
function=3D'0x0'/>
      </disk>
      <disk type=3D'file' device=3D'cdrom'>
        <driver name=3D'qemu' type=3D'raw'/>
        <target dev=3D'hdc' bus=3D'ide'/>
        <readonly/>
        <address type=3D'drive' controller=3D'0' bus=3D'1' target=3D'0' uni=
t=3D'0'/>
      </disk>
      <controller type=3D'pci' index=3D'0' model=3D'pci-root'/>
      <controller type=3D'ide' index=3D'0'>
        <address type=3D'pci' domain=3D'0x0000' bus=3D'0x00' slot=3D'0x01' =
function=3D'0x1'/>
      </controller>
      <controller type=3D'usb' index=3D'0'>
        <address type=3D'pci' domain=3D'0x0000' bus=3D'0x00' slot=3D'0x01' =
function=3D'0x2'/>
      </controller>
      <interface type=3D'bridge'>
        <mac address=3D'0c:da:41:1d:ae:f1'/>
        <source bridge=3D'vswitch0'/>
        <model type=3D'virtio'/>
        <driver name=3D'vhost'/>
        <address type=3D'pci' domain=3D'0x0000' bus=3D'0x00' slot=3D'0x03' =
function=3D'0x0'/>
      </interface>
      <input type=3D'mouse' bus=3D'ps2'/>
      <input type=3D'keyboard' bus=3D'ps2'/>
      <graphics type=3D'vnc' port=3D'-1' autoport=3D'yes' listen=3D'0.0.0.0=
'>
        <listen type=3D'address' address=3D'0.0.0.0'/>
      </graphics>
      <video>
        <model type=3D'cirrus' vram=3D'16384' heads=3D'1'/>
        <address type=3D'pci' domain=3D'0x0000' bus=3D'0x00' slot=3D'0x02' =
function=3D'0x0'/>
      </video>
      <memballoon model=3D'virtio'>
        <address type=3D'pci' domain=3D'0x0000' bus=3D'0x00' slot=3D'0x09' =
function=3D'0x0'/>
      </memballoon>
    </devices>
  </domain>

  3. The panic stack is
    ... cannot show
    async_page_fault+0x28
    ioread32_rep+0x38
    ata_sff_data_xfer32+0x8a
    ata_pio_sector+0x93
    ata_pio_sectors+0x34
    ata_sff_hsm_move+0x226
    RIP: kthread_data+0x10
    CR2: FFFFFFFF_FFFFFFD8

  4. Change the host os to Redhat 7.2 , the vm is good even memory
  >=3D3.8T.

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