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Date:	Wed, 24 Dec 2014 11:02:39 +0000
From:	Jamie Heilman <jamie@...ible.transient.net>
To:	"Chen, Tiejun" <tiejun.chen@...el.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	kvm list <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	luto@...capital.net
Subject: Re: regression bisected; KVM: entry failed, hardware error 0x80000021

Chen, Tiejun wrote:
> 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:
> >>>>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.

3.18.0-rc3-00120-gd4ae84a0 + vmx reorder msr writes patch = OK
3.18.0-rc3-00121-g0e60b07 + vmx reorder msr writes patch = emulation failure

So that certainly points to 0e60b0799fedc495a5c57dbd669de3c10d72edd2
as well.

> Could you try this to fix your last error?

Running qemu-system-x86_64 -machine pc,accel=kvm -nodefaults works,
my real (headless) kvm guests work, but this new patch makes running
"qemu-system-x86_64 -machine pc,accel=kvm" fail again, this time with
errors in the host to the tune of:

------------[ cut here ]------------
WARNING: CPU: 1 PID: 3901 at arch/x86/kvm/x86.c:6575 kvm_arch_vcpu_ioctl_run+0xd63/0xe5b [kvm]()
Modules linked in: nfsv4 cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_ondemand cpufreq_conservative autofs4 fan nfsd auth_rpcgss nfs lockd grace fscache sunrpc bridge stp llc vhost_net tun vhost macvtap macvlan fuse cbc dm_crypt usb_storage snd_hda_codec_analog snd_hda_codec_generic kvm_intel kvm tg3 ptp pps_core sr_mod snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd sg dcdbas cdrom psmouse soundcore floppy evdev xfs dm_mod raid1 md_mod
CPU: 1 PID: 3901 Comm: qemu-system-x86 Not tainted 3.19.0-rc1-00011-g53262d1-dirty #1
Hardware name: Dell Inc. Precision WorkStation T3400  /0TP412, BIOS A14 04/30/2012
 0000000000000000 000000007e052328 ffff8800c25ffcf8 ffffffff813defbe
 0000000000000000 0000000000000000 ffff8800c25ffd38 ffffffff8103b517
 ffff8800c25ffd28 ffffffffa019bdec ffff8800caf1d000 ffff8800c2774800
Call Trace:
 [<ffffffff813defbe>] dump_stack+0x4c/0x6e
 [<ffffffff8103b517>] warn_slowpath_common+0x97/0xb1
 [<ffffffffa019bdec>] ? kvm_arch_vcpu_ioctl_run+0xd63/0xe5b [kvm]
 [<ffffffff8103b60b>] warn_slowpath_null+0x15/0x17
 [<ffffffffa019bdec>] kvm_arch_vcpu_ioctl_run+0xd63/0xe5b [kvm]
 [<ffffffffa02308b9>] ? vmcs_load+0x20/0x62 [kvm_intel]
 [<ffffffffa0231e03>] ? vmx_vcpu_load+0x140/0x16a [kvm_intel]
 [<ffffffffa0196ba3>] ? kvm_arch_vcpu_load+0x15c/0x161 [kvm]
 [<ffffffffa018d8b1>] kvm_vcpu_ioctl+0x189/0x4bd [kvm]
 [<ffffffff8104647a>] ? do_sigtimedwait+0x12f/0x189
 [<ffffffff810ea316>] do_vfs_ioctl+0x370/0x436
 [<ffffffff810f24f2>] ? __fget+0x67/0x72
 [<ffffffff810ea41b>] SyS_ioctl+0x3f/0x5e
 [<ffffffff813e34d2>] system_call_fastpath+0x12/0x17
---[ end trace 46abac932fb3b4a1 ]---
------------[ cut here ]------------
WARNING: CPU: 1 PID: 3901 at arch/x86/kvm/x86.c:6575 kvm_arch_vcpu_ioctl_run+0xd63/0xe5b [kvm]()
Modules linked in: nfsv4 cpufreq_userspace cpufreq_stats cpufreq_powersave cpufreq_ondemand cpufreq_conservative autofs4 fan nfsd auth_rpcgss nfs lockd grace fscache sunrpc bridge stp llc vhost_net tun vhost macvtap macvlan fuse cbc dm_crypt usb_storage snd_hda_codec_analog snd_hda_codec_generic kvm_intel kvm tg3 ptp pps_core sr_mod snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep snd_pcm snd_timer snd sg dcdbas cdrom psmouse soundcore floppy evdev xfs dm_mod raid1 md_mod
CPU: 1 PID: 3901 Comm: qemu-system-x86 Tainted: G        W      3.19.0-rc1-00011-g53262d1-dirty #1
Hardware name: Dell Inc. Precision WorkStation T3400  /0TP412, BIOS A14 04/30/2012
 0000000000000000 000000007e052328 ffff8800c25ffcf8 ffffffff813defbe
 0000000000000000 0000000000000000 ffff8800c25ffd38 ffffffff8103b517
 ffff8800c25ffd28 ffffffffa019bdec ffff8800caf1d000 ffff8800c2774800
Call Trace:
 [<ffffffff813defbe>] dump_stack+0x4c/0x6e
 [<ffffffff8103b517>] warn_slowpath_common+0x97/0xb1
 [<ffffffffa019bdec>] ? kvm_arch_vcpu_ioctl_run+0xd63/0xe5b [kvm]
 [<ffffffff8103b60b>] warn_slowpath_null+0x15/0x17
 [<ffffffffa019bdec>] kvm_arch_vcpu_ioctl_run+0xd63/0xe5b [kvm]
 [<ffffffffa02308b9>] ? vmcs_load+0x20/0x62 [kvm_intel]
 [<ffffffffa0231e03>] ? vmx_vcpu_load+0x140/0x16a [kvm_intel]
 [<ffffffffa0196ba3>] ? kvm_arch_vcpu_load+0x15c/0x161 [kvm]
 [<ffffffffa018d8b1>] kvm_vcpu_ioctl+0x189/0x4bd [kvm]
 [<ffffffff8104647a>] ? do_sigtimedwait+0x12f/0x189
 [<ffffffff810ea316>] do_vfs_ioctl+0x370/0x436
 [<ffffffff810f24f2>] ? __fget+0x67/0x72
 [<ffffffff810ea41b>] SyS_ioctl+0x3f/0x5e
 [<ffffffff813e34d2>] system_call_fastpath+0x12/0x17
---[ end trace 46abac932fb3b4a2 ]---

over and over and over ad nauseum, or until I kill the qemu command,
it also eats a core's worth of cpu.


-- 
Jamie Heilman                     http://audible.transient.net/~jamie/
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