Created attachment 128051 [details] host-dmesg Environment: ------------ Host OS (ia32/ia32e/IA64):ia32e Guest OS (ia32/ia32e/IA64):ia32e Guest OS Type (Linux/Windows):Linux kvm.git Commit:d3714010c307d26df251c45be9cd12ab6d41f0c4 qemu-kvm Commit:9fbee91a131a05e443d7108d7fbdf3ca91020290 Host Kernel Version:3.14.0-rc1 Hardware:Romley_EP, Ivytown_EP Bug detailed description: -------------------------- after create guest, the host will call trace Reproduce steps: ---------------- 1. create guest qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -net none /root/rhel6u4.qcow Current result: ---------------- host call trace Expected result: ---------------- guest and host work fine Basic root-causing log: ---------------------- vmwrite error: reg 2812 value 0 (err 12) CPU: 2 PID: 10596 Comm: qemu-system-x86 Not tainted 3.14.0-rc1 #2 Hardware name: Intel Corporation S2600CP/S2600CP, BIOS SE5C600.86B.02.01.1001.080920131108 08/09/2013 0000000000000000 ffff880234079c78 ffffffff81482475 0000000000000006 ffff880623130040 ffff880234079c88 ffffffffa02d51d2 ffff880234079c98 ffffffffa02d51ed ffff880234079cc8 ffffffffa02dd407 00000000000003c0 Call Trace: [<ffffffff81482475>] dump_stack+0x49/0x5c [<ffffffffa02d51d2>] vmwrite_error+0x27/0x29 [kvm_intel] [<ffffffffa02d51ed>] vmcs_writel+0x19/0x1b [kvm_intel] [<ffffffffa02dd407>] vmx_set_msr+0x10b/0x26e [kvm_intel] [<ffffffffa025c37c>] do_set_msr+0x27/0x29 [kvm] [<ffffffffa02673cf>] msr_io+0xa0/0x101 [kvm] [<ffffffffa025c355>] ? kvm_set_msr+0x13/0x13 [kvm] [<ffffffffa0267936>] kvm_arch_vcpu_ioctl+0x37e/0xb7b [kvm] [<ffffffffa02d5484>] ? update_cr8_intercept+0x1b/0x1d [kvm_intel] [<ffffffffa0264495>] ? update_cr8_intercept+0x65/0x6a [kvm] [<ffffffffa026a07c>] ? kvm_arch_vcpu_ioctl_set_sregs+0x38b/0x407 [kvm] [<ffffffffa025750e>] ? kvm_vcpu_ioctl+0x25c/0x4b5 [kvm] [<ffffffffa02681d8>] ? kvm_arch_vcpu_load+0xa5/0x16c [kvm] [<ffffffffa02576f0>] kvm_vcpu_ioctl+0x43e/0x4b5 [kvm] [<ffffffff8110349b>] ? do_brk+0x265/0x2bc [<ffffffff8113495d>] do_vfs_ioctl+0x2a2/0x2be [<ffffffff8113c799>] ? __fget_light+0x4a/0x5c [<ffffffff811349d2>] SyS_ioctl+0x59/0x7d [<ffffffff8148c762>] system_call_fastpath+0x16/0x1b more tests: kernel version:3.14.0-rc1 kvm.git + qemu.git =result d3714010 + 732c66ce =pass d3714010 + 9fbee91a =fail kernel version:3.13.-rc2 kvm.git + qemu.git =result 7650b687 + 732c66ce = pass 7650b687 + 9fbee91a = pass
Created attachment 128901 [details] patch to fix bug71521 apply the patch to kvm.git:d3714010c307d26df251c45be9cd12ab6d41f0c4, after create guest, the guest and host work fine, the bug can't reproduce.
Hi, I'm on leave during March 10 ~12. During this period, I may occasionally check my email and probably not able to reply you in time. Anything urgent could reach me by +86 186 2190 5686. Thanks.
In the reporter's case, this is caused by a bug in VMX microcode. However it can happen also with nested virtualization. A patch was posted to kvm@vger.kernel.org.
kvm.git + qemu.git:920c8377_9c5793c5 test on Romley_EP and Ivytown_EP,after create guest, the guest and host work fine, the bug can't reproduce.
this patch fixed the bug: commit 920c837785699bcc48f4a729ba9ee3492f620b95 Author: Paolo Bonzini <pbonzini@redhat.com> Date: Wed Mar 26 15:54:00 2014 +0100 KVM: vmx: fix MPX detection kvm_x86_ops is still NULL at this point. Since kvm_init_msr_list cannot fail, it is safe to initialize it before the call. Fixes: 93c4adc7afedf9b0ec190066d45b6d67db5270da Reported-by: Fengguang Wu <fengguang.wu@intel.com> Tested-by: Jet Chen <jet.chen@intel.com> Cc: kvm@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>