Ccing Seabios community.
On 2015/11/3 14:58, Xulei (Stone, Euler) wrote:
> On qemu-kvm platform, when I reset a VM through "virsh reset", and
> coincidently
> the VM is in process of internal rebooting at the same time. Then the VM will
> not be successfully reseted any more due to the reset reen
On Wed, Nov 04, 2015 at 08:48:20AM +0800, Gonglei wrote:
> On 2015/11/3 14:58, Xulei (Stone, Euler) wrote:
> > On qemu-kvm platform, when I reset a VM through "virsh reset", and
> > coincidently
> > the VM is in process of internal rebooting at the same time. Then the VM
> > will
> > not be succe
>On Wed, Nov 04, 2015 at 08:48:20AM +0800, Gonglei wrote:
>> On 2015/11/3 14:58, Xulei (Stone, Euler) wrote:
>> > On qemu-kvm platform, when I reset a VM through "virsh reset", and
>> > coincidently
>> > the VM is in process of internal rebooting at the same time. Then the VM
>> > will
>> > not
On Fri, Nov 06, 2015 at 09:12:34AM +, Xulei (Stone) wrote:
>
> >On Wed, Nov 04, 2015 at 08:48:20AM +0800, Gonglei wrote:
> >> On 2015/11/3 14:58, Xulei (Stone, Euler) wrote:
> >> > On qemu-kvm platform, when I reset a VM through "virsh reset", and
> >> > coincidently
> >> > the VM is in proce
On Mon, Nov 09, 2015 at 08:32:53AM -0500, Kevin O'Connor wrote:
> On Fri, Nov 06, 2015 at 09:12:34AM +, Xulei (Stone) wrote:
> > >On Wed, Nov 04, 2015 at 08:48:20AM +0800, Gonglei wrote:
> > >I'm surprised you would see the above on a recent qemu/kvm though - as
> > >on a newer KVM I think the
On Mon, Nov 09, 2015 at 03:06:18PM -0500, Kevin O'Connor wrote:
> On Mon, Nov 09, 2015 at 08:32:53AM -0500, Kevin O'Connor wrote:
> > On Fri, Nov 06, 2015 at 09:12:34AM +, Xulei (Stone) wrote:
> > > >On Wed, Nov 04, 2015 at 08:48:20AM +0800, Gonglei wrote:
> > > >I'm surprised you would see the
Dear Kevin,
Sorry for delayed replying. This patch works for me well. Thanks a lot!
Recently, I found another odd thing. A qemu-kvm VM is stuck at the SeaBIOS
after self-rebooting many times. Analyzing the SeaBIOS log attached below, I
think there maybe someting wrong from this block of code:
/
Kevin,
After deeply analyzing, i think there may be 3 possible reasons:
1)wrong CountCPUs value. It seems CountCPUs++ in handle_smp() has no lock to
protect.
So, sometimes, 2 or more vcpu may get the same current value of CountCPUs. Then
we'll
get a single incrementation instead of 2 or more and
On Thu, Nov 19, 2015 at 12:42:50PM +, Xulei (Stone) wrote:
> Kevin,
>
> After deeply analyzing, i think there may be 3 possible reasons:
> 1)wrong CountCPUs value. It seems CountCPUs++ in handle_smp() has no
> lock to protect. So, sometimes, 2 or more vcpu may get the same
> current value of
>On Thu, Nov 19, 2015 at 12:42:50PM +, Xulei (Stone) wrote:
>> Kevin,
>>
>> After deeply analyzing, i think there may be 3 possible reasons:
>> 1)wrong CountCPUs value. It seems CountCPUs++ in handle_smp() has no
>> lock to protect. So, sometimes, 2 or more vcpu may get the same
>> current
On Fri, Dec 18, 2015 at 03:04:58AM +, Gonglei (Arei) wrote:
> Hi Kevin & Paolo,
>
> Luckily, I reproduced this problem last night. And I got the below log when
> SeaBIOS is stuck.
[...]
> [2015-12-18 10:38:10] gonglei: finish while
[...]
> <...>-31509 [035] 154753.180077: kvm_exit: reason
Hi Kevin & Paolo,
Luckily, I reproduced this problem last night. And I got the below log when
SeaBIOS is stuck.
[BTW, the whole SeaBIOS log attached]
[2015-12-18 10:38:10] >gonglei: enter smp_setup()...
[2015-12-18 10:38:10] >gonglei: begine to enable local APIC...
[2015-12-18 10:38:10]
>
> From: Kevin O'Connor [mailto:ke...@koconnor.net]
> Sent: Saturday, December 19, 2015 7:13 AM
> To: Gonglei (Arei)
> Cc: Xulei (Stone); Paolo Bonzini; qemu-devel; seabios@seabios.org;
> Huangweidong (C); k...@vger.kernel.org
> Subject: Re: [Qemu-devel] [PATCH] SeaBios: Fix reset procedure reentr
Hi Kevin,
> -Original Message-
> From: Kevin O'Connor [mailto:ke...@koconnor.net]
>
> On Fri, Dec 18, 2015 at 03:04:58AM +, Gonglei (Arei) wrote:
> > Hi Kevin & Paolo,
> >
> > Luckily, I reproduced this problem last night. And I got the below log when
> SeaBIOS is stuck.
> [...]
> >
On Sat, Dec 19, 2015 at 12:03:15PM +, Gonglei (Arei) wrote:
> Maybe the root cause is not NMI but INTR, so yield() can open hardware
> interrupt,
> And then execute interrupt handler, but the interrupt handler make the SeaBIOS
> stack broken, so that the BSP can't execute the instruction and o
> -Original Message-
> From: Kevin O'Connor [mailto:ke...@koconnor.net]
> Sent: Saturday, December 19, 2015 11:12 PM
> On Sat, Dec 19, 2015 at 12:03:15PM +, Gonglei (Arei) wrote:
> > Maybe the root cause is not NMI but INTR, so yield() can open hardware
> interrupt,
> > And then execut
On Sun, Dec 20, 2015 at 09:49:54AM +, Gonglei (Arei) wrote:
> > From: Kevin O'Connor [mailto:ke...@koconnor.net]
> > Sent: Saturday, December 19, 2015 11:12 PM
> > On Sat, Dec 19, 2015 at 12:03:15PM +, Gonglei (Arei) wrote:
> > > Maybe the root cause is not NMI but INTR, so yield() can open
Dear Kevin,
> -Original Message-
> From: Kevin O'Connor [mailto:ke...@koconnor.net]
> Sent: Sunday, December 20, 2015 10:33 PM
> To: Gonglei (Arei)
> Cc: Xulei (Stone); Paolo Bonzini; qemu-devel; seabios@seabios.org;
> Huangweidong (C); k...@vger.kernel.org; Radim Krcmar
> Subject: Re: [Qe
On Mon, Dec 21, 2015 at 09:41:32AM +, Gonglei (Arei) wrote:
> When the gurb of OS is booting, then the softirq and C function send_disk_op()
> may use extra stack of SeaBIOS. If we inject a NMI, romlayout.S:
> irqentry_extrastack
> is invoked, and the extra stack will be used again. And the st
> -Original Message-
> From: Kevin O'Connor [mailto:ke...@koconnor.net]
> Sent: Tuesday, December 22, 2015 2:47 AM
> To: Gonglei (Arei)
> Cc: Xulei (Stone); Paolo Bonzini; qemu-devel; seabios@seabios.org;
> Huangweidong (C); k...@vger.kernel.org; Radim Krcmar
> Subject: Re: [Qemu-devel] [PA
Hi, Kevin,
Can you tell how to reset/reboot this VM, if it goes to the handle_hwpic1()
on its booting procedure? I mean, usually, SeaBIOS would not go to
handle_hwpic routine. But in my test case, SeaBIOS calls handle_hwpic when
KVM injects a #UD expcetion (not irq) and SeaBIOS will loop to handl
On Tue, Dec 22, 2015 at 03:15:26AM +, Xulei (Stone) wrote:
> Hi, Kevin,
> Can you tell how to reset/reboot this VM, if it goes to the handle_hwpic1()
> on its booting procedure? I mean, usually, SeaBIOS would not go to
> handle_hwpic routine. But in my test case, SeaBIOS calls handle_hwpic whe
On Tue, Dec 22, 2015 at 02:14:12AM +, Gonglei (Arei) wrote:
> > From: Kevin O'Connor [mailto:ke...@koconnor.net]
> > Sent: Tuesday, December 22, 2015 2:47 AM
> > To: Gonglei (Arei)
> > Cc: Xulei (Stone); Paolo Bonzini; qemu-devel; seabios@seabios.org;
> > Huangweidong (C); k...@vger.kernel.org;
> -Original Message-
> From: Kevin O'Connor [mailto:ke...@koconnor.net]
> Sent: Tuesday, December 22, 2015 11:51 PM
> To: Gonglei (Arei)
> Cc: Xulei (Stone); Paolo Bonzini; qemu-devel; seabios@seabios.org;
> Huangweidong (C); k...@vger.kernel.org; Radim Krcmar
> Subject: Re: [Qemu-devel] [P
On Wed, Dec 23, 2015 at 06:40:12AM +, Gonglei (Arei) wrote:
> > From: Kevin O'Connor [mailto:ke...@koconnor.net]
> > On Tue, Dec 22, 2015 at 02:14:12AM +, Gonglei (Arei) wrote:
> > > Sorry, it doesn't work. What's worse is we cannot stop SeaBIOS stuck by
> > > Setting "CONFIG_ENTRY_EXTRASTA
Kevin O'Connor wrote:
> SeaBIOS is careful to always disable IRQs while running C code to
> prevent this issue, but disabling normal IRQs does not disable NMIs.
> So, I believe this issue is specific to the nature of NMIs.
Would a dedicated NMI handler stack be a good solution?
//Peter
On Wed, Dec 23, 2015 at 09:27:25PM +0100, Peter Stuge wrote:
> Kevin O'Connor wrote:
> > SeaBIOS is careful to always disable IRQs while running C code to
> > prevent this issue, but disabling normal IRQs does not disable NMIs.
> > So, I believe this issue is specific to the nature of NMIs.
>
> Wo
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