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Date: Wed, 31 Mar 2010 15:45:19 +0200 (CEST) From: Jiri Kosina <jkosina@...e.cz> To: Andre Przywara <andre.przywara@....com> Cc: Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>, Joerg Roedel <joerg.roedel@....com>, linux-kernel@...r.kernel.org, kvm@...r.kernel.org Subject: Re: KVM warning about uncertified CPU for SMP for AMD model 2, stepping 3 On Wed, 31 Mar 2010, Andre Przywara wrote: > But the far better solution is to instruct QEMU/KVM to inject a better CPU > model (as it was suggested by some people two weeks ago). I am about to test > various guests with respect to their behavior regarding different > family/model/stepping settings (one issue is already fixed). If this goes > well, I will send out the patch to inject the host's CPUID F/M/S into the > guest by default (which has other advantages, but denies migration mostly). > > BTW.: I encourage people to test their KVM guests with "-cpu host" (on newer > QEMUs) and send me any crash logs. I just quickly checked ... [ 0.048001] Pid: 0, comm: swapper Not tainted (2.6.32.9-0.5-pae #1) Bochs [ 0.048001] EIP: 0060:[<c0528a80>] EFLAGS: 00010246 CPU: 0 [ 0.048001] EIP is at init_amd+0x249/0x279 [ 0.048001] EAX: 00000000 EBX: 00000000 ECX: 00a21000 EDX: 00000000 [ 0.048001] ESI: c077de80 EDI: c077de98 EBP: c07e1a14 ESP: c0749f8c [ 0.048001] DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: 0068 [ 0.048001] Process swapper (pid: 0, ti=c0748000 task=c074fca0 task.ti=c0748000) [ 0.048001] Stack: [ 0.048001] 000000e8 00000000 00000000 c07b9720 c077de80 c077debc c077de98 c0527d74 [ 0.048001] <0> de816448 de816440 00000000 00000000 de840580 000080d0 c07b9720 00099d00 [ 0.048001] <0> c074c000 00bfc003 c078822d c07882c8 c028e762 c07b9720 c0781a05 00000062 [ 0.048001] Call Trace: [ 0.048001] [<c0527d74>] identify_cpu+0xc2/0x223 [ 0.048001] [<c078822d>] identify_boot_cpu+0xa/0x22 [ 0.048001] [<c07882c8>] check_bugs+0x8/0xd2 [ 0.048001] [<c0781a05>] start_kernel+0x32e/0x3a9 [ 0.048001] Code: 00 00 39 44 24 08 0f 96 c0 0f b6 d0 0f b7 86 b6 00 00 00 8b 0c 9d 80 e4 77 c0 8d 04 42 31 d2 66 89 44 0d 00 0f b7 86 b8 00 00 00 <f7> 74 24 08 66 89 96 b8 00 00 00 e9 77 fe ff ff 66 c7 05 00 1d [ 0.048001] EIP: [<c0528a80>] init_amd+0x249/0x279 SS:ESP 0068:c0749f8c [ 0.116025] ---[ end trace 4eaa2a86a8e2da22 ]--- [ 0.117661] Kernel panic - not syncing: Attempted to kill the idle task! [ 0.120008] Pid: 0, comm: swapper Tainted: G D 2.6.32.9-0.5-pae #1 [ 0.122115] Call Trace: [ 0.124032] [<c02069a1>] try_stack_unwind+0x1b1/0x1f0 [ 0.125821] [<c020596f>] dump_trace+0x3f/0xe0 [ 0.132019] [<c02065ab>] show_trace_log_lvl+0x4b/0x60 [ 0.136012] [<c02065d8>] show_trace+0x18/0x20 [ 0.137572] [<c052dc19>] dump_stack+0x6d/0x74 [ 0.139120] [<c052dc62>] panic+0x42/0x145 [ 0.140018] [<c0242936>] do_exit+0x236/0x310 [ 0.141550] [<c0531063>] oops_end+0xc3/0xd0 [ 0.144012] [<c020455c>] do_divide_error+0x7c/0x90 [ 0.145643] [<c05304ee>] error_code+0x66/0x6c [ 0.147235] [<c0528a80>] init_amd+0x249/0x279 [ 0.148011] [<c0527d74>] identify_cpu+0xc2/0x223 [ 0.149649] [<c078822d>] identify_boot_cpu+0xa/0x22 [ 0.152010] [<c07882c8>] check_bugs+0x8/0xd2 [ 0.153573] [<c0781a05>] start_kernel+0x32e/0x3a9 But I admit that this isn't the most up-to-date version, so perhaps it's already fixed ... -- Jiri Kosina SUSE Labs, Novell Inc. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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