On Tue, Feb 17, 2015 at 07:07:21PM +0100, Jan Kiszka wrote: > On 2015-02-17 19:00, Bandan Das wrote: > > Kashyap Chamarthy <kchamart@xxxxxxxxxx> writes: > > .. > >>> > >>> Does enable_apicv make a difference? > >> > >> Actually, I did perform a test (on Paolo's suggestion on IRC) with > >> enable_apicv=0 on physical host, and it didn't make any difference: > >> > >> $ cat /proc/cmdline > >> BOOT_IMAGE=/vmlinuz-3.20.0-0.rc0.git5.1.fc23.x86_64 root=/dev/mapper/fedora--server_dell--per910--02-root ro console=ttyS1,115200n81 rd.lvm.lv=fedora-server_dell-per910-02/swap rd.lvm.lv=fedora-server_dell-per910-02/root LANG=en_US.UTF-8 enable_apicv=0 > > > > I am not sure if this works ? enable_apicv is a kvm_intel module parameter > > Good point. Has to be kvm_intel.enable_apicv=0 (if the module is built in). Hmm, yeah, I should have just added "options kvm-intel enable_apicv=n" (without quotes) to /etc/modprobe.d/dist.conf. I just rebooted the host with "kvm_intel.enable_apicv=0" on Kernel command line: $ dmesg | grep apicv [ 0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.20.0-0.rc0.git5.1.fc23.x86_64 root=/dev/mapper/fedora--server_dell--per910--02-root ro console=ttyS1,115200n81 rd.lvm.lv=fedora-server_dell-per910-02/swap rd.lvm.lv=fedora-server_dell-per910-02/root LANG=en_US.UTF-8 kvm_intel.enable_apicv=0 [ 0.000000] Kernel command line: BOOT_IMAGE=/vmlinuz-3.20.0-0.rc0.git5.1.fc23.x86_64 root=/dev/mapper/fedora--server_dell--per910--02-root ro console=ttyS1,115200n81 rd.lvm.lv=fedora-server_dell-per910-02/swap rd.lvm.lv=fedora-server_dell-per910-02/root LANG=en_US.UTF-8 kvm_intel.enable_apicv=0 $ cat /sys/module/kvm_intel/parameters/enable_apicv N Then, booted an L2 guest over L1's serial console, while observing host's `dmesg -w`, I can see the same traceback: . . . [ 918.327553] ------------[ cut here ]------------ [ 918.332196] WARNING: CPU: 13 PID: 2201 at arch/x86/kvm/vmx.c:9190 nested_vmx_vmexit+0x96e/0xb00 [kvm_intel]() [ 918.342162] Modules linked in: vhost_net vhost macvtap macvlan xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack tun bridge stp llc ip6table_filter ip6_tables cfg80211 rfkill iTCO_wdt ipmi_devintf iTCO_vendor_support gpio_ich dcdbas coretemp kvm_intel kvm crc32c_intel serio_raw ipmi_ssif ipmi_si tpm_tis tpm ipmi_msghandler acpi_power_meter i7core_edac lpc_ich edac_core acpi_cpufreq mfd_core shpchp wmi mgag200 i2c_algo_bit drm_kms_helper ttm drm ata_generic pata_acpi megaraid_sas bnx2 [ 918.396548] CPU: 13 PID: 2201 Comm: qemu-system-x86 Not tainted 3.20.0-0.rc0.git5.1.fc23.x86_64 #1 [ 918.405605] Hardware name: Dell Inc. PowerEdge R910/0P658H, BIOS 2.8.2 10/25/2012 [ 918.413138] 0000000000000000 00000000651bc665 ffff883f619ebc18 ffffffff818760f7 [ 918.420790] 0000000000000000 0000000000000000 ffff883f619ebc58 ffffffff810ab80a [ 918.428336] ffff887f5b838000 ffff883f3f8c8000 0000000000000000 0000000000000014 [ 918.435865] Call Trace: [ 918.438390] [<ffffffff818760f7>] dump_stack+0x4c/0x65 [ 918.443590] [<ffffffff810ab80a>] warn_slowpath_common+0x8a/0xc0 [ 918.449596] [<ffffffff810ab93a>] warn_slowpath_null+0x1a/0x20 [ 918.455494] [<ffffffffa100857e>] nested_vmx_vmexit+0x96e/0xb00 [kvm_intel] [ 918.462455] [<ffffffffa100b5f7>] ? vmx_handle_exit+0x1e7/0xcb2 [kvm_intel] [ 918.469444] [<ffffffffa0236972>] ? kvm_arch_vcpu_ioctl_run+0x6d2/0x1b50 [kvm] [ 918.476731] [<ffffffffa100892a>] vmx_queue_exception+0x10a/0x150 [kvm_intel] [ 918.483870] [<ffffffffa023730b>] kvm_arch_vcpu_ioctl_run+0x106b/0x1b50 [kvm] [ 918.491078] [<ffffffffa0236972>] ? kvm_arch_vcpu_ioctl_run+0x6d2/0x1b50 [kvm] [ 918.498302] [<ffffffff8110760d>] ? trace_hardirqs_on+0xd/0x10 [ 918.504203] [<ffffffffa021edf6>] ? vcpu_load+0x26/0x70 [kvm] [ 918.510012] [<ffffffff81103c0f>] ? lock_release_holdtime.part.29+0xf/0x200 [ 918.516973] [<ffffffffa021f203>] kvm_vcpu_ioctl+0x383/0x7e0 [kvm] [ 918.523157] [<ffffffff81027b9d>] ? native_sched_clock+0x2d/0xa0 [ 918.529167] [<ffffffff810d5fc6>] ? creds_are_invalid.part.1+0x16/0x50 [ 918.535701] [<ffffffff810d6021>] ? creds_are_invalid+0x21/0x30 [ 918.541678] [<ffffffff813a61da>] ? inode_has_perm.isra.48+0x2a/0xa0 [ 918.548097] [<ffffffff8128c7b8>] do_vfs_ioctl+0x2e8/0x530 [ 918.553579] [<ffffffff8128ca81>] SyS_ioctl+0x81/0xa0 [ 918.558635] [<ffffffff8187f8e9>] system_call_fastpath+0x12/0x17 [ 918.564640] ---[ end trace b07d41c569219c46 ]--- [ 1092.389383 < 173.824743>] kvm [2168]: vcpu0 unhandled rdmsr: 0x1c9 [ 1092.394374 < 0.004991>] kvm [2168]: vcpu0 unhandled rdmsr: 0x1a6 [ 1092.399399 < 0.005025>] kvm [2168]: vcpu0 unhandled rdmsr: 0x3f6 . . . -- /kashyap -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
