Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751565AbaLXI3l (ORCPT ); Wed, 24 Dec 2014 03:29:41 -0500 Received: from mga09.intel.com ([134.134.136.24]:14115 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750740AbaLXI3k (ORCPT ); Wed, 24 Dec 2014 03:29:40 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.07,637,1413270000"; d="scan'208";a="628602768" Message-ID: <549A796C.50801@intel.com> Date: Wed, 24 Dec 2014 16:29:32 +0800 From: "Chen, Tiejun" User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:31.0) Gecko/20100101 Thunderbird/31.3.0 MIME-Version: 1.0 To: jamie@audible.transient.net CC: Paolo Bonzini , kvm list , "linux-kernel@vger.kernel.org" , luto@amacapital.net Subject: Re: regression bisected; KVM: entry failed, hardware error 0x80000021 References: <20141221124640.GA4059@cucamonga.audible.transient.net> <5497C882.4000108@intel.com> <20141222092358.GA3915@cucamonga.audible.transient.net> <5498CA50.8070906@intel.com> <5498CB62.3070901@intel.com> <20141223072659.GA4015@cucamonga.audible.transient.net> In-Reply-To: <20141223072659.GA4015@cucamonga.audible.transient.net> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2014/12/23 15:26, Jamie Heilman wrote: > Chen, Tiejun wrote: >> On 2014/12/23 9:50, Chen, Tiejun wrote: >>> On 2014/12/22 17:23, Jamie Heilman wrote: >>>> Chen, Tiejun wrote: >>>>> On 2014/12/21 20:46, Jamie Heilman wrote: >>>>>> With v3.19-rc1 when I run qemu-system-x86_64 -machine pc,accel=kvm I >>>>>> get: >>>>>> >>>>>> KVM: entry failed, hardware error 0x80000021 >>>>> >>>>> Looks some MSR writing issues such a failed entry. >>>>> >>>>>> If you're running a guest on an Intel machine without unrestricted mode >>>>>> support, the failure can be most likely due to the guest entering an >>>>>> invalid >>>>>> state for Intel VT. For example, the guest maybe running in big real >>>>>> mode >>>>>> which is not supported on less recent Intel processors. >>>>>> >>>>>> EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000663 >>>>>> ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000 >>>>>> EIP=0000e05b EFL=00010002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0 >>>>>> ES =0000 00000000 0000ffff 00009300 >>>>>> CS =f000 000f0000 0000ffff 00009b00 >>>>>> SS =0000 00000000 0000ffff 00009300 >>>>>> DS =0000 00000000 0000ffff 00009300 >>>>>> FS =0000 00000000 0000ffff 00009300 >>>>>> GS =0000 00000000 0000ffff 00009300 >>>>>> LDT=0000 00000000 0000ffff 00008200 >>>>>> TR =0000 00000000 0000ffff 00008b00 >>>>>> GDT= 00000000 0000ffff >>>>>> IDT= 00000000 0000ffff >>>>>> CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000 >>>>>> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 >>>>>> DR3=0000000000000000 >>>>>> DR6=00000000ffff0ff0 DR7=0000000000000400 >>>>>> EFER=0000000000000000 >>>>> >>>>> And I don't see any obvious wrong as well. Any valuable info from dmesg? >>>> >>>> With the simple qemu command above, on 3.18.1 I see: >>>> >>>> kern.info: kvm: zapping shadow pages for mmio generation wraparound >>>> >>>> when I fire up a full guest that's actually useful I get: >>>> >>>> kern.info: kvm: zapping shadow pages for mmio generation wraparound >>>> kern.err: kvm [4073]: vcpu0 disabled perfctr wrmsr: 0xc1 data 0xffff >>>> >>>> On 3.18.0-rc3-00042-g34a1cd6 nothing appears in the dmesg, just the >>>> message I mention above to stderr. Same thing with a stock >>>> 3.19.0-rc1. Once I apply your patch the simple test command produces >>>> the same zapping shadow pages messages as 3.18.1, and a test guest of >>>> a Debian Jessie image (w/stock distro kernel) produces the same thing >>>> with disabled perfctr wrmsr message. However, it doesn't look like >>> >>> Sorry I'm not sure if I understood current status. Looks 3.19-rc1 & my >>> patch just fix that error above, >>> >>> KVM: entry failed, hardware error 0x80000021 >>> ... >>> >>> Right? >>> >>>> I'm entirely out of the woods, because one of my other guest VMs with a >>>> custom kernel that works great under 3.18.1 now fails to run. Nothing >>>> in dmesg, but here's the stderr: >>> >>> But even you revert 34a1cd60d17 or just apply my patch, something else >>> introduced between 3.18.1 and 3.19-rc1 led this error below, right? >>> >>>> >>>> KVM internal error. Suberror: 1 >>>> emulation failure >>>> EAX=000de494 EBX=00000000 ECX=00000000 EDX=00000cfd >>>> ESI=00000059 EDI=00000000 EBP=00000000 ESP=00006fb4 >>>> EIP=000f15c1 EFL=00010016 [----AP-] CPL=0 II=0 A20=1 SMM=0 HLT=0 >>>> ES =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] >>>> CS =0008 00000000 ffffffff 00c09b00 DPL=0 CS32 [-RA] >>>> SS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] >>>> DS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] >>>> FS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] >>>> GS =0010 00000000 ffffffff 00c09300 DPL=0 DS [-WA] >>>> LDT=0000 00000000 0000ffff 00008200 DPL=0 LDT >>>> TR =0000 00000000 0000ffff 00008b00 DPL=0 TSS32-busy >>>> GDT= 000f6be8 00000037 >>>> IDT= 000f6c26 00000000 >>>> CR0=60000011 CR2=00000000 CR3=00000000 CR4=00000000 >>>> DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000 >>>> DR3=0000000000000000 >>>> DR6=00000000ffff0ff0 DR7=0000000000000400 >>>> EFER=0000000000000000 >>>> Code=e8 ae fc ff ff 89 f2 a8 10 89 d8 75 0a b9 41 15 ff ff ff d1 <5b> >>>> 5e c3 5b 5e e9 76 ff ff ff b0 11 e6 20 e6 a0 b0 08 e6 21 b0 70 e6 a1 >>>> b0 04 e6 21 b0 02 >>>> >>>> FWIW, I get the same thing with 34a1cd60d17 reverted. Maybe there are >>>> two bugs, maybe there's more to this first one. I can repro this >>> >>> So if my understanding is correct, this is probably another bug. And >>> especially, I already saw the same log in another thread, "Cleaning up >>> the KVM clock". Maybe you can continue to `git bisect` to locate that >>> bad commit. >>> >> >> Looks just now Andy found that commit, >> 0e60b0799fedc495a5c57dbd669de3c10d72edd2 "kvm: change memslot sorting rule >> from size to GFN", maybe you can try to revert this to try yours again. > > That doesn't revert cleanly for me, and I don't have much time to > fiddle with it until the 24th---so checked out the commit before it > (d4ae84a0), applied your patch, built, and yes, everything works fine > at that point. I'll probably have time for another full bisection > later, assuming things aren't ironed out already by then. Could you try this to fix your last error? Signed-off-by: Tiejun Chen --- virt/kvm/kvm_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index f528343..a2d928c 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -672,6 +672,7 @@ static void update_memslots(struct kvm_memslots *slots, WARN_ON(mslots[i].id != id); if (!new->npages) { new->base_gfn = 0; + new->flags = 0; if (mslots[i].npages) slots->used_slots--; } else { @@ -688,7 +689,7 @@ static void update_memslots(struct kvm_memslots *slots, i++; } while (i > 0 && - new->base_gfn > mslots[i - 1].base_gfn) { + new->base_gfn >= mslots[i - 1].base_gfn) { mslots[i] = mslots[i - 1]; slots->id_to_index[mslots[i].id] = i; i--; -- 1.9.1 Tiejun -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/