[Xen-users] HVM falls back to qemu emulation while VMX is enable

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:

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
(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

_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users

WARNING - OLD ARCHIVES

xen-users

[Xen-users] HVM falls back to qemu emulation while VMX is enabled (Xen 3