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New: KVM hv-time

Bug 73721 [email protected] 1 participant 5 messages Apr 9, 2014 – May 8, 2014 KVM

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https://bugzilla.kernel.org/show_bug.cgi?id=73721

            Bug ID: 73721
           Summary: KVM hv-time
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.14.0
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Hi,

I'm trying to start a Windows 8.1 x86_64 virtual machine and the system moves very slow. After the vm starts the log is full of :

Apr 05 21:20:51 kvm kernel: ------------[ cut here ]------------
Apr 05 21:20:51 kvm kernel: WARNING: CPU: 3 PID: 1919 at
arch/x86/kvm/x86.c:1112 kvm_get_msr_common+0x793/0x960 [kvm]()
Apr 05 21:20:51 kvm kernel: Modules linked in: nls_utf8 cifs dns_resolver
fscache bridge ebt_ip stp llc ebtable_filter ebtables x_tables nct6775
hwmon_vid coretemp iTCO_wdt iTCO_vendor_
Apr 05 21:20:51 kvm kernel:  raid1 md_mod sd_mod crc_t10dif atkbd libps2
crct10dif_pclmul crct10dif_common crc32_pclmul crc32c_intel ghash_clmulni_intel
aesni_intel aes_x86_64 lrw gf128
Apr 05 21:20:51 kvm kernel: CPU: 3 PID: 1919 Comm: windows_81 Tainted: G       
W    3.14.0-3-mainline #2
Apr 05 21:20:51 kvm kernel: Hardware name: To Be Filled By O.E.M. To Be Filled
By O.E.M./Z77 Professional, BIOS P1.70B 11/12/2013
Apr 05 21:20:51 kvm kernel:  0000000000000009 ffff8808007f9c10 ffffffff814d563c
0000000000000000
Apr 05 21:20:51 kvm kernel:  ffff8808007f9c48 ffffffff81064f1d 0000000040000020
ffff8808007f9cd8
Apr 05 21:20:51 kvm kernel:  ffff880800b53ec0 ffff8808011b0000 ffff8808011b0040
ffff8808007f9c58
Apr 05 21:20:51 kvm kernel: Call Trace:
Apr 05 21:20:51 kvm kernel:  [<ffffffff814d563c>] dump_stack+0x4d/0x6f
Apr 05 21:20:51 kvm kernel:  [<ffffffff81064f1d>]
warn_slowpath_common+0x7d/0xa0
Apr 05 21:20:51 kvm kernel:  [<ffffffff81064ffa>] warn_slowpath_null+0x1a/0x20
Apr 05 21:20:51 kvm kernel:  [<ffffffffa0101433>]
kvm_get_msr_common+0x793/0x960 [kvm]
Apr 05 21:20:51 kvm kernel:  [<ffffffffa02ef012>] vmx_get_msr+0x102/0x370
[kvm_intel]
Apr 05 21:20:51 kvm kernel:  [<ffffffffa02ecfe8>] ?
skip_emulated_instruction+0x58/0x60 [kvm_intel]
Apr 05 21:20:51 kvm kernel:  [<ffffffffa02ef2aa>] handle_rdmsr+0x2a/0x140
[kvm_intel]
Apr 05 21:20:51 kvm kernel:  [<ffffffffa02f48b5>] vmx_handle_exit+0xb5/0xa20
[kvm_intel]
Apr 05 21:20:51 kvm kernel:  [<ffffffffa02ec360>] ?
vmx_invpcid_supported+0x20/0x20 [kvm_intel]
Apr 05 21:20:51 kvm kernel:  [<ffffffffa0106b20>]
kvm_arch_vcpu_ioctl_run+0xc10/0x1130 [kvm]
Apr 05 21:20:51 kvm kernel:  [<ffffffffa010283e>] ?
kvm_arch_vcpu_load+0x4e/0x1e0 [kvm]
Apr 05 21:20:51 kvm kernel:  [<ffffffffa00ef5c2>] kvm_vcpu_ioctl+0x2b2/0x5b0
[kvm]
Apr 05 21:20:51 kvm kernel:  [<ffffffff811e4ab8>] ? fsnotify+0x228/0x2f0
Apr 05 21:20:51 kvm kernel:  [<ffffffff814dabe5>] ?
_raw_spin_unlock_irq+0x25/0x30
Apr 05 21:20:51 kvm kernel:  [<ffffffff811b6180>] do_vfs_ioctl+0x2e0/0x4c0
Apr 05 21:20:51 kvm kernel:  [<ffffffff811bff9e>] ? __fget+0x6e/0xb0
Apr 05 21:20:51 kvm kernel:  [<ffffffff811b63e1>] SyS_ioctl+0x81/0xa0
Apr 05 21:20:51 kvm kernel:  [<ffffffff814e3069>]
system_call_fastpath+0x16/0x1b
Apr 05 21:20:51 kvm kernel: ---[ end trace 4ce12a32c5d85c78 ]---
Apr 05 21:20:51 kvm kernel: ------------[ cut here ]------------

I'm using kernel 3.14.0 and qemu-git.
This happens only when qemu is started with "hv-time" suboption.

Same command line with "hv-time" worked without any problems with kernel 3.13.6.

My config is :

qemu-system-x86_64 \
    -daemonize \
    -pidfile "/run/qemu-$VM.pid" \
    -nodefconfig -nodefaults \
    -name "$VM",process="$VM" \
    -enable-kvm \
    -boot menu=on \
    -rtc base=localtime \
    -machine q35 \
    -balloon none \
    -m 8192 -mem-path /dev/hugepages -mem-prealloc \
    -cpu Haswell,hv-time \
    -smp sockets=1,cores=4,threads=1 \
    -bios bios-256k.bin \
    -chardev file,path="$VM-seabios.log",id=seabios -device
isa-debugcon,iobase=0x402,chardev=seabios \
    -vga none \
    -nographic \
    -monitor unix:/run/qemu-$VM.monitor,server,nowait \
    -serial none \
    -parallel none \
    -device
ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1 \
    -device
vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,x-vga=on,romfile=$KVM_ROOT/roms/Sapphire_RadeonHD_7790.rom
\
    -device vfio-pci,host=00:1b.0,bus=pcie.0 \
    -device vfio-pci,host=06:00.0,bus=pcie.0 \
    -device vfio-pci,host=09:00.0,bus=pcie.0 \
    -device vfio-pci,host=0b:00.0,bus=pcie.0

Thanks.

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#2 lore raw

[Bug 73721] KVM hv-time

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=73721

Rasmus Eskola <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------
CC| |[email protected]

--- Comment #2 from Rasmus Eskola <[email protected]> ---
I can also confirm this on my Arch Linux system. Near bare-metal performance on 3.13 kernel with hv-time, but getting these error messages in dmesg on 3.14.

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#3 lore raw

[Bug 73721] KVM hv-time

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=73721

Paolo Bonzini <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
                 CC|                            |[email protected]
         Resolution|---                         |CODE_FIX

--- Comment #3 from Paolo Bonzini <[email protected]> ---
Already fixed by commit b351c39cc9e0151cee9b8d52a1e714928faabb38, but Marcelo forgot to CC stable. I'll propose the patch myself.

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