Re: [Xen-users] HVM falls back to qemu emulation while VMX is enabled (Xen 3.1)

["Andrew Lyon" <andrew.lyon@xxxxxxxxx>]

On Tue, Oct 7, 2008 at 2:58 PM, Pim van Riezen <pi+lists@xxxxxxxxxxxx> wrote:
> Hi,
> I've got a machine with two 2-core Xeon 5140 CPUs that is running hvm guests
> like they were spawned by bochs running on a sparcstation 1. Taking a look
> in top on domain0 shows me qemu-dm eating about 70% cpu while the machine
> boots. Another machine running the same version of CentOS but with a Xeon
> 5150 has no issues.
>
> I've briefly tried xen/xend 3.2 on the machine. If I used the
> /boot/xen.gz-3.2 as the hypervisor, /proc/cpuinfo would stop listing vmx
> among the capabilities. Going back to the RedHat version of xen-3.1 and
> xend-3.0, I get them back:

Not that it helps with your problem, but not seeing vmx in
/proc/cpuinfo is normal for newer versions of Xen, after all Linux
cannot use the vmx feature as it is already being used by the Xen
hypervisor, so it is logical that the feature is no longer listed.

>
> flags : fpu tsc msr pae mce cx8 apic mtrr mca cmov pat pse36 clflush dts
> acpi mmx fxsr sse sse2 ss ht tm syscall lm constant_tsc pni monitor ds_cpl
> vmx est tm2 cx16 xtpr lahf_lm
>
> The guest entry in xm list:
>
> (domain
>    (domid 2)
>    (uuid 4548659f-d6e6-4e37-95d5-d8d002cfddf9)
>    (vcpus 1)
>    (cpu_weight 1.0)
>    (memory 4096)
>    (shadow_memory 33)
>    (maxmem 4096)
>    (features )
>    (name win2k8)
>    (on_poweroff destroy)
>    (on_reboot restart)
>    (on_crash restart)
>    (image
>        (hvm
>            (kernel /usr/lib/xen/boot/hvmloader)
>            (device_model /usr/lib64/xen/bin/qemu-dm)
>            (pae 1)
>            (vcpus 1)
>            (boot cda)
>            (serial pty)
>            (vnc 1)
>            (vncdisplay 1)
>            (vncunused 1)
>            (xauthority /root/.Xauthority)
>            (acpi 1)
>            (apic 1)
>            (usbdevice tablet)
>            (vncpasswd )
>        )
>    )
>    (device
>        (vif
>            (backend 0)
>            (script vif-bridge)
>            (bridge xenbr0)
>            (mac 00:16:3e:51:58:14)
>        )
>    )
>    (device
>        (vbd
>            (backend 0)
>            (dev hda:disk)
>            (uname phy:/dev/mapper/vpsvg--006-win2k8)
>            (mode w)
>        )
>    )
>    (device
>        (vbd (backend 0) (dev hdc:cdrom) (uname file:/root/win2k8.iso) (mode
> r))
>    )
>    (state -b----)
>    (shutdown_reason poweroff)
>    (cpu_time 90.422212135)
>    (online_vcpus 1)
>    (up_time 189.009996891)
>    (start_time 1223387435.83)
>    (store_mfn 983038)
> )
>
> The xen dmesg:
>
> __  __            _____  _   ____     ___ ____    _   _ _____      _ ____
> \ \/ /___ _ __   |___ / / | |___ \   / _ \___ \  / | / |___ /  ___| | ___|
>  \  // _ \ \047_ \    |_ \ | |   __) |_| (_) |__) | | | | | |_ \ / _ \ |___
> \
>  /  \  __/ | | |  ___) || |_ / __/|__\__, / __/ _| |_| |___) |  __/ |___) |
> /_/\_\___|_| |_| |____(_)_(_)_____|    /_/_____(_)_(_)_|____(_)___|_|____/
>
> http://www.cl.cam.ac.uk/netos/xen
> University of Cambridge Computer Laboratory
>
> Xen version 3.1.2-92.1.13.el5 (mockbuild@xxxxxxxxxx) (gcc version 4.1.2
> 20071124 (Red Hat 4.1.2-42)) Wed Sep 24 19:25:14 EDT 2008
> Latest ChangeSet: unavailable
>
> (XEN) Command line: dom0_mem=1024M
> (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 1 MBR signatures
> (XEN)  Found 1 EDD information structures
> (XEN) Xen-e820 RAM map:
> (XEN)  0000000000000000 - 00000000000a0000 (usable)
> (XEN)  0000000000100000 - 00000000bfb50000 (usable)
> (XEN)  00000000bfb50000 - 00000000bfb66000 (reserved)
> (XEN)  00000000bfb66000 - 00000000bfb85c00 (ACPI data)
> (XEN)  00000000bfb85c00 - 00000000c0000000 (reserved)
> (XEN)  00000000e0000000 - 00000000f0000000 (reserved)
> (XEN)  00000000fe000000 - 0000000100000000 (reserved)
> (XEN)  0000000100000000 - 0000000440000000 (usable)
> (XEN) System RAM: 16378MB (16772032kB)
> (XEN) Xen heap: 14MB (14496kB)
> (XEN) Domain heap initialised: DMA width 32 bits
> (XEN) Processor #0 6:15 APIC version 20
> (XEN) Processor #6 6:15 APIC version 20
> (XEN) Processor #1 6:15 APIC version 20
> (XEN) Processor #7 6:15 APIC version 20
> (XEN) IOAPIC[0]: apic_id 8, version 32, address 0xfec00000, GSI 0-23
> (XEN) IOAPIC[1]: apic_id 9, version 32, address 0xfec81000, GSI 64-87
> (XEN) Enabling APIC mode:  Flat.  Using 2 I/O APICs
> (XEN) Using scheduler: SMP Credit Scheduler (credit)
> (XEN) Detected 2327.545 MHz processor.
> (XEN) HVM: VMX enabled

That is where you should expect VMX to be detected.

> (XEN) VMX: MSR intercept bitmap enabled
> (XEN) CPU0: Intel(R) Xeon(R) CPU            5140  @ 2.33GHz stepping 06
> (XEN) Booting processor 1/6 eip 90000
> (XEN) CPU1: Intel(R) Xeon(R) CPU            5140  @ 2.33GHz stepping 06
> (XEN) Booting processor 2/1 eip 90000
> (XEN) CPU2: Intel(R) Xeon(R) CPU            5140  @ 2.33GHz stepping 06
> (XEN) Booting processor 3/7 eip 90000
> (XEN) CPU3: Intel(R) Xeon(R) CPU            5140  @ 2.33GHz stepping 06
> (XEN) Total of 4 processors activated.
> (XEN) ENABLING IO-APIC IRQs
> (XEN)  -> Using new ACK method
> (XEN) Platform timer overflows in 14998 jiffies.
> (XEN) Platform timer is 14.318MHz HPET
> (XEN) Brought up 4 CPUs
> (XEN) *** LOADING DOMAIN 0 ***
> (XEN) elf_parse_binary: phdr: paddr=0xffffffff80200000 memsz=0x2d6d20
> (XEN) elf_parse_binary: phdr: paddr=0xffffffff804d6d80 memsz=0x1161d0
> (XEN) elf_parse_binary: phdr: paddr=0xffffffff805ed000 memsz=0xc08
> (XEN) elf_parse_binary: phdr: paddr=0xffffffff805ee000 memsz=0x1134e4
> (XEN) elf_parse_binary: memory: 0xffffffff80200000 -> 0xffffffff807014e4
> (XEN) elf_xen_parse_note: GUEST_OS = "linux"
> (XEN) elf_xen_parse_note: GUEST_VERSION = "2.6"
> (XEN) elf_xen_parse_note: XEN_VERSION = "xen-3.0"
> (XEN) elf_xen_parse_note: VIRT_BASE = 0xffffffff80000000
> (XEN) elf_xen_parse_note: PADDR_OFFSET = 0xffffffff80000000
> (XEN) elf_xen_parse_note: ENTRY = 0xffffffff80200000
> (XEN) elf_xen_parse_note: HYPERCALL_PAGE = 0xffffffff80206000
> (XEN) elf_xen_parse_note: FEATURES =
> "writable_page_tables|writable_descriptor_tables|auto_translated_physmap|pae_pgdir_above_4gb|supervisor_mode_kernel"
> (XEN) elf_xen_parse_note: LOADER = "generic"
> (XEN) elf_xen_addr_calc_check: addresses:
> (XEN)     virt_base        = 0xffffffff80000000
> (XEN)     elf_paddr_offset = 0xffffffff80000000
> (XEN)     virt_offset      = 0x0
> (XEN)     virt_kstart      = 0xffffffff80200000
> (XEN)     virt_kend        = 0xffffffff807014e4
> (XEN)     virt_entry       = 0xffffffff80200000
> (XEN)  Xen  kernel: 64-bit, lsb, compat32
> (XEN)  Dom0 kernel: 64-bit, lsb, paddr 0xffffffff80200000 ->
> 0xffffffff807014e4
> (XEN) PHYSICAL MEMORY ARRANGEMENT:
> (XEN)  Dom0 alloc.:   0000000430000000->0000000432000000 (253952 pages to be
> allocated)
> (XEN) VIRTUAL MEMORY ARRANGEMENT:
> (XEN)  Loaded kernel: ffffffff80200000->ffffffff807014e4
> (XEN)  Init. ramdisk: ffffffff80702000->ffffffff80e6ce00
> (XEN)  Phys-Mach map: ffffffff80e6d000->ffffffff8106d000
> (XEN)  Start info:    ffffffff8106d000->ffffffff8106d49c
> (XEN)  Page tables:   ffffffff8106e000->ffffffff8107b000
> (XEN)  Boot stack:    ffffffff8107b000->ffffffff8107c000
> (XEN)  TOTAL:         ffffffff80000000->ffffffff81400000
> (XEN)  ENTRY ADDRESS: ffffffff80200000
> (XEN) Dom0 has maximum 4 VCPUs
> (XEN) elf_load_binary: phdr 0 at 0xffffffff80200000 -> 0xffffffff804d6d20
> (XEN) elf_load_binary: phdr 1 at 0xffffffff804d6d80 -> 0xffffffff805ecf50
> (XEN) elf_load_binary: phdr 2 at 0xffffffff805ed000 -> 0xffffffff805edc08
> (XEN) elf_load_binary: phdr 3 at 0xffffffff805ee000 -> 0xffffffff80628388
> (XEN) Initrd len 0x76ae00, start at 0xffffffff80702000
> (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 \047CTRL-a\047 three times to switch
> input to Xen).
> (XEN) Freed 100kB init memory.
>
> Any suggestions?
>
> Cheers,
> Pi
>
> _______________________________________________
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> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>

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