Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

Thank you for help and tips. I need to find another server, newer and try Xen 
or bhyve. 

Most likely we will decommission this box or install debian 9 or 10/kvm for it. 
Lets see.

Stefan

> On 16. Oct 2019, at 19.29, Roger Pau Monné  wrote:
> 
> On Wed, Oct 16, 2019 at 07:10:44PM +0300, Stefan Parvu wrote:
>>> 
 Also, IIRC X58 had some interrupt remapping issues, can you try to
 boot with iommu=no-intremap? (without any other iommu options)
>>> 
>> 
>> here my /boot/loader.conf
>> 
>> root@earth:~ # cat /boot/loader.conf 
>> kern.geom.label.disk_ident.enable="0"
>> kern.geom.label.gptid.enable="0"
>> zfs_load="YES"
>> if_tap_load="YES"
>> xen_kernel="/boot/xen"
>> xen_cmdline="dom0_mem=8192M dom0_max_vcpus=4 dom0=pvh console=com1,vga 
>> com1=115200,8n1 guest_loglvl=all loglvl=all iommu=no-intremap"
>> 
>> 
>> Nope, same problem 
>> 
>> and this is what I get now:
>> http://www.kronometrix.org/bugs/freebsd_xen2.jpg 
>> 
> 
> Hm, can you remove iommu=no-intremap and try to capture a video of Xen
> booting? I'm hoping I might be able to spot why Xen is refusing to use
> the iommu.
> 
> Roger.

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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 07:10:44PM +0300, Stefan Parvu wrote:
> > 
> >> Also, IIRC X58 had some interrupt remapping issues, can you try to
> >> boot with iommu=no-intremap? (without any other iommu options)
> > 
> 
> here my /boot/loader.conf
> 
> root@earth:~ # cat /boot/loader.conf 
> kern.geom.label.disk_ident.enable="0"
> kern.geom.label.gptid.enable="0"
> zfs_load="YES"
> if_tap_load="YES"
> xen_kernel="/boot/xen"
> xen_cmdline="dom0_mem=8192M dom0_max_vcpus=4 dom0=pvh console=com1,vga 
> com1=115200,8n1 guest_loglvl=all loglvl=all iommu=no-intremap"
> 
> 
> Nope, same problem 
> 
> and this is what I get now:
> http://www.kronometrix.org/bugs/freebsd_xen2.jpg 
> 

Hm, can you remove iommu=no-intremap and try to capture a video of Xen
booting? I'm hoping I might be able to spot why Xen is refusing to use
the iommu.

Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

> 
>> Also, IIRC X58 had some interrupt remapping issues, can you try to
>> boot with iommu=no-intremap? (without any other iommu options)
> 

here my /boot/loader.conf

root@earth:~ # cat /boot/loader.conf 
kern.geom.label.disk_ident.enable="0"
kern.geom.label.gptid.enable="0"
zfs_load="YES"
if_tap_load="YES"
xen_kernel="/boot/xen"
xen_cmdline="dom0_mem=8192M dom0_max_vcpus=4 dom0=pvh console=com1,vga 
com1=115200,8n1 guest_loglvl=all loglvl=all iommu=no-intremap"


Nope, same problem 

and this is what I get now:
http://www.kronometrix.org/bugs/freebsd_xen2.jpg 



Stefan
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 06:59:46PM +0300, Stefan Parvu wrote:
> > Also, IIRC X58 had some interrupt remapping issues, can you try to
> > boot with iommu=no-intremap? (without any other iommu options)
> 
> Let me try quickly that. No serial it is too complicated for this machine. 
> 
> If we can make this running do you think FreeBSD Xen Dom0 will ever support 
> HVM
> linux guests ?

FreeBSD Xen dom0 already supports Linux HVM guests, just as it
supports Windows HVM guests or any kind of HVM guest in general (ie:
whatever guests you can run on a Linux dom0 should also work on a
FreeBSD dom0).

Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

> Also, IIRC X58 had some interrupt remapping issues, can you try to
> boot with iommu=no-intremap? (without any other iommu options)

Let me try quickly that. No serial it is too complicated for this machine. 

If we can make this running do you think FreeBSD Xen Dom0 will ever support HVM
linux guests ?


stefan
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 06:15:33PM +0300, Stefan Parvu wrote:
> > # acpidump -t|grep DMAR
> >  DMAR: Length=180, Revision=1, Checksum=195,
> > OEMID=A M I, OEM Table ID=OEMDMAR, OEM Revision=0x1,
> > 
> 
> root@earth:~ # acpidump -t | grep DMAR
>   DMAR: Length=288, Revision=1, Checksum=93,
>   OEMID=AMI, OEM Table ID=OEMDMAR, OEM Revision=0x1,

So there's an iommu, then it must be Xen refusing to use it.

Is it possible for you to setup a serial console in order to get the
full Xen boot log?

Also, IIRC X58 had some interrupt remapping issues, can you try to
boot with iommu=no-intremap? (without any other iommu options)

Thanks, Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

> # acpidump -t|grep DMAR
>  DMAR: Length=180, Revision=1, Checksum=195,
>   OEMID=A M I, OEM Table ID=OEMDMAR, OEM Revision=0x1,
> 

root@earth:~ # acpidump -t | grep DMAR
  DMAR: Length=288, Revision=1, Checksum=93,
OEMID=AMI, OEM Table ID=OEMDMAR, OEM Revision=0x1,

this is it.

Stefan
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

> When booting plain FreeBSD, can you try the following?
> 
> # acpidump -t|grep DMAR
>  DMAR: Length=180, Revision=1, Checksum=195,
>   OEMID=A M I, OEM Table ID=OEMDMAR, OEM Revision=0x1,
> 
> If you don't get output it means there's no DMAR ACPI table, and thus
> no VT-d support (at least from the OS point of view).

sure. Will try this and report back in couple of hours. 
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 02:07:55PM +0300, Konstantin Belousov wrote:
> On Wed, Oct 16, 2019 at 11:28:23AM +0200, Roger Pau Monné wrote:
> > On Wed, Oct 16, 2019 at 12:17:20PM +0300, Stefan Parvu wrote:
> > > > 
> > > > Your box doesn't seem to have an iommu (aka vt-d for Intel).
> > > 
> > > In BIOS I do have VT-D Enabled option. Would that be broken or not 
> > > working ?
> > 
> > Are you sure it's VT-d and not VT-x what you have enabled in the BIOS?
> > 
> > Looking at the details of your CPU:
> > 
> > https://ark.intel.com/content/www/us/en/ark/products/41447/intel-core-i7-930-processor-8m-cache-2-80-ghz-4-80-gt-s-intel-qpi.html
> > 
> > VT-d is not listed in 'Advanced Technologies'. For example looking at
> > a newer model:
> > 
> > https://ark.intel.com/content/www/us/en/ark/products/149091/intel-core-i7-8565u-processor-8m-cache-up-to-4-60-ghz.html
> > 
> > You can see VT-d listed in 'Advanced Technologies'.
> Nehalems do have VT-d, but they have dedicated chip with north bridge
> still, CPU only provided memory controller.  So VT-d is the feature of
> the chipset, e.g. X58, not mentioning Xeon chipsets.  On the other hand,
> VT-d support was relatively buggy, could it be that Xen kernel refuses
> to use it due to the problems ?

It's possible that Xen refuses to enable the iommu due to erratas, I'm
however unable to find the specification document of the X58 chipset
with the erratas, seems to be gone from the Intel site.

Stefan:

When booting plain FreeBSD, can you try the following?

# acpidump -t|grep DMAR
  DMAR: Length=180, Revision=1, Checksum=195,
OEMID=A M I, OEM Table ID=OEMDMAR, OEM Revision=0x1,

If you don't get output it means there's no DMAR ACPI table, and thus
no VT-d support (at least from the OS point of view).

Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Konstantin Belousov]

On Wed, Oct 16, 2019 at 11:28:23AM +0200, Roger Pau Monné wrote:
> On Wed, Oct 16, 2019 at 12:17:20PM +0300, Stefan Parvu wrote:
> > > 
> > > Your box doesn't seem to have an iommu (aka vt-d for Intel).
> > 
> > In BIOS I do have VT-D Enabled option. Would that be broken or not working ?
> 
> Are you sure it's VT-d and not VT-x what you have enabled in the BIOS?
> 
> Looking at the details of your CPU:
> 
> https://ark.intel.com/content/www/us/en/ark/products/41447/intel-core-i7-930-processor-8m-cache-2-80-ghz-4-80-gt-s-intel-qpi.html
> 
> VT-d is not listed in 'Advanced Technologies'. For example looking at
> a newer model:
> 
> https://ark.intel.com/content/www/us/en/ark/products/149091/intel-core-i7-8565u-processor-8m-cache-up-to-4-60-ghz.html
> 
> You can see VT-d listed in 'Advanced Technologies'.
Nehalems do have VT-d, but they have dedicated chip with north bridge
still, CPU only provided memory controller.  So VT-d is the feature of
the chipset, e.g. X58, not mentioning Xeon chipsets.  On the other hand,
VT-d support was relatively buggy, could it be that Xen kernel refuses
to use it due to the problems ?

> 
> > I think I have used Xen a bit older version on Debian some time back if Im 
> > not wrong, on the same hdw.
> 
> See below.
> 
> > >> But you need all boot log. I will try your option tonight. I cant access 
> > >> the hardware now.
> > > 
> > > If you can that would be helpful, but AFAIK this box is simply not
> > > capable of running a Xen PVH dom0 (which is the only mode FreeBSD
> > > supports in order to work as dom0). Either it has a broken iommu or no
> > > iommu at all.
> > 
> > Hmmm. Thats strange since I do recall I had previously used here Xen but on 
> > Linux. But older
> > version. Could it be something changed regarding Xen and iommu or ?
> 
> Linux dom0 would likely be in PV mode (note the missing H), which
> doesn't require an iommu. OTOH FreeBSD only supports PVH dom0, which
> does require an iommu.
> 
> Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 01:09:11PM +0300, Stefan Parvu wrote:
> thank you guys for tips.
> 
> > Are you sure it's VT-d and not VT-x what you have enabled in the BIOS?
> 
> Yes, I think the ASUS BIOS had listed VT-d. But will double check tonight. 
> But it might be 
> that the CPU does not support VT-d. Thats very true. Hmmm. Is there any point 
> even to
> update the CPU on this system, would it even support some new CPU models ? 

I'm afraid I have no idea. I don't deal with hardware setup myself.

> > Linux dom0 would likely be in PV mode (note the missing H), which
> > doesn't require an iommu. OTOH FreeBSD only supports PVH dom0, which
> > does require an iommu.
> 
> Right. It could be tat I was using PV mode (paravirtualisation) mode, without 
> HVM
> extensions which PVH uses. Right ? Thats I cant say. It was some time back. 

So in order to provide an overview:

 - PV doesn't require VT-x nor VT-d.
 - PV guests with pci-passthrough devices require VT-d for safety
   reasons.
 - PVH/HVM require VT-x.
 - PVH dom0 or HVM/PVH guests with pci-passthrough devices require
   both VT-d and VT-x.

Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

thank you guys for tips.

> Are you sure it's VT-d and not VT-x what you have enabled in the BIOS?

Yes, I think the ASUS BIOS had listed VT-d. But will double check tonight. But 
it might be 
that the CPU does not support VT-d. Thats very true. Hmmm. Is there any point 
even to
update the CPU on this system, would it even support some new CPU models ? 

> Linux dom0 would likely be in PV mode (note the missing H), which
> doesn't require an iommu. OTOH FreeBSD only supports PVH dom0, which
> does require an iommu.

Right. It could be tat I was using PV mode (paravirtualisation) mode, without 
HVM
extensions which PVH uses. Right ? Thats I cant say. It was some time back. 

Stefan
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 12:17:20PM +0300, Stefan Parvu wrote:
> > 
> > Your box doesn't seem to have an iommu (aka vt-d for Intel).
> 
> In BIOS I do have VT-D Enabled option. Would that be broken or not working ?

Are you sure it's VT-d and not VT-x what you have enabled in the BIOS?

Looking at the details of your CPU:

https://ark.intel.com/content/www/us/en/ark/products/41447/intel-core-i7-930-processor-8m-cache-2-80-ghz-4-80-gt-s-intel-qpi.html

VT-d is not listed in 'Advanced Technologies'. For example looking at
a newer model:

https://ark.intel.com/content/www/us/en/ark/products/149091/intel-core-i7-8565u-processor-8m-cache-up-to-4-60-ghz.html

You can see VT-d listed in 'Advanced Technologies'.

> I think I have used Xen a bit older version on Debian some time back if Im 
> not wrong, on the same hdw.

See below.

> >> But you need all boot log. I will try your option tonight. I cant access 
> >> the hardware now.
> > 
> > If you can that would be helpful, but AFAIK this box is simply not
> > capable of running a Xen PVH dom0 (which is the only mode FreeBSD
> > supports in order to work as dom0). Either it has a broken iommu or no
> > iommu at all.
> 
> Hmmm. Thats strange since I do recall I had previously used here Xen but on 
> Linux. But older
> version. Could it be something changed regarding Xen and iommu or ?

Linux dom0 would likely be in PV mode (note the missing H), which
doesn't require an iommu. OTOH FreeBSD only supports PVH dom0, which
does require an iommu.

Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Gerd Hafenbrack]

On 2019-10-16 11:17, Stefan Parvu wrote:
>> ... capable of running a Xen PVH dom0 (which is the only mode FreeBSD
>> supports in order to work as dom0). Either it has a broken iommu or no
>> iommu at all.
> 
> Hmmm. Thats strange since I do recall I had previously used here Xen but on 
> Linux. But older
> version. Could it be something changed regarding Xen and iommu or ? ...
You used Xen on Linux in *PVH* mode?



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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

> 
> Your box doesn't seem to have an iommu (aka vt-d for Intel).

In BIOS I do have VT-D Enabled option. Would that be broken or not working ? 
I think I have used Xen a bit older version on Debian some time back if Im not 
wrong, on the same hdw.

>> But you need all boot log. I will try your option tonight. I cant access the 
>> hardware now.
> 
> If you can that would be helpful, but AFAIK this box is simply not
> capable of running a Xen PVH dom0 (which is the only mode FreeBSD
> supports in order to work as dom0). Either it has a broken iommu or no
> iommu at all.

Hmmm. Thats strange since I do recall I had previously used here Xen but on 
Linux. But older
version. Could it be something changed regarding Xen and iommu or ?

Stefan
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 12:07:50PM +0300, Stefan Parvu wrote:
> 
> > If your box doesn't have a serial header, you can add noreboot to
> > xen_cmdline and paste a photo of the screen with the panic message,
> > it's not great but at least we would get an idea of what's wrong.
> > 
> 
> Im not sure I can setup a serial console on this wkst. Will check.
> 
> The last thing I see is this:
> http://www.kronometrix.org/bugs/freebsd_xen.jpg 
>  but nothing like a thread 
> dump,
> stack trace etc … 

Your box doesn't seem to have an iommu (aka vt-d for Intel).

> But you need all boot log. I will try your option tonight. I cant access the 
> hardware now.

If you can that would be helpful, but AFAIK this box is simply not
capable of running a Xen PVH dom0 (which is the only mode FreeBSD
supports in order to work as dom0). Either it has a broken iommu or no
iommu at all.

Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

> If your box doesn't have a serial header, you can add noreboot to
> xen_cmdline and paste a photo of the screen with the panic message,
> it's not great but at least we would get an idea of what's wrong.
> 

Im not sure I can setup a serial console on this wkst. Will check.

The last thing I see is this:
http://www.kronometrix.org/bugs/freebsd_xen.jpg 
 but nothing like a thread 
dump,
stack trace etc … 

But you need all boot log. I will try your option tonight. I cant access the 
hardware now.

> Yes, when you are at the bootloader screen press '3', and then type:
> 
>> unload
>> unset xen_kernel
>> boot

Thats very good. Thanks. 


Stefan
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 11:49:50AM +0300, Stefan Parvu wrote:
> > Can you please provide the full boot log? I'm afraid that I'm not able
> > to provide any suggestions without knowing what went wrong.
> 
> In BIOS everything regarding virtualization is turned ON.
> 
> How can I provide the full boot log if my machine is rebooting itself … 
> and have no access to the files? Im not able to control how can I boot again.
> I usually need to reinstall everything from scratch. 

Could you setup a serial console in order to get the boot log?

https://www.freebsd.org/doc/handbook/serialconsole-setup.html
https://www.freebsd.org/doc/handbook/virtualization-host-xen.html

If your box doesn't have a serial header, you can add noreboot to
xen_cmdline and paste a photo of the screen with the panic message,
it's not great but at least we would get an idea of what's wrong.

> Is there any way to configure the boot loader and boot with or without Xen 
> kernel ?

Yes, when you are at the bootloader screen press '3', and then type:

> unload
> unset xen_kernel
> boot

That would make your box boot into plain FreeBSD without Xen.

Roger.
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Stefan Parvu]

> Can you please provide the full boot log? I'm afraid that I'm not able
> to provide any suggestions without knowing what went wrong.

In BIOS everything regarding virtualization is turned ON.

How can I provide the full boot log if my machine is rebooting itself … 
and have no access to the files? Im not able to control how can I boot again.
I usually need to reinstall everything from scratch. 

Is there any way to configure the boot loader and boot with or without Xen 
kernel ?

Many thanks,
Stefan
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Re: cannot install FreeBSD 12.0 Xen 4.12.1 on Intel Core i7 CPU 930

[Roger Pau Monné]

On Wed, Oct 16, 2019 at 12:12:06AM +0300, Stefan Parvu wrote:
> Hi,
> 
> I have a bit of problem, cannot install FreeBSD/Xen on a bit older hardware. 
> The hardware 
> should support the minimal VT-D/IOMMU settings, required by Xen.
> 
> CPU: Intel(R) Core(TM) i7 CPU 930  @ 2.80GHz (2806.42-MHz K8-class 
> CPU)
>   Origin="GenuineIntel"  Id=0x106a5  Family=0x6  Model=0x1a  Stepping=5
>   
> Features=0xbfebfbff
>   
> Features2=0x98e3bd
>   AMD Features=0x28100800
>   AMD Features2=0x1
>   VT-x: PAT,HLT,MTF,PAUSE,EPT,VPID
>   TSC: P-state invariant, performance statistics
> 
> I get always a panic on CPU0 followed by a reboot. My /boot/loader.conf was 
> set as:
> 
> xen_cmdline="dom0_mem=2048M dom0_max_vcpus=4 dom0=pvh console=com1,vga 
> com1=115200,8n1 guest_loglvl=all loglvl=all iommu=debug,force”
> 
> Any ideas what I could try ?

Hello,

Can you please provide the full boot log? I'm afraid that I'm not able
to provide any suggestions without knowing what went wrong.

Thanks, Roger.
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Re: i/o is very slow on FreeBSD dom0 with Xen-4.12 and Freebsd-12

[Roger Pau Monné]

On Tue, Oct 15, 2019 at 08:56:22AM -0700, Brian Buhrow wrote:
>   hello Roger.  Sorry, my bad.  I didn't even look at the cause of the
> panic.   Rebooting the system caused it to come up clean after another pass
> with fsck.  With the ioapic_ack=old argument, the system comes up right
> away and is quite responsive.
>   Can you explain how to select which argument to use on the command
> line if the autoselection code doesn't work?

Hm, it's not so much that the autodetection is wrong, AFAIK there's
some hardware issue with specific models that make the new ack method
not work properly. This is limited to very specific (and older)
models. Note that you might still see interrupt timeouts with the old
ack method.

I will try to figure out if there's any hardware errata that could be
related to this issue, and try to find a box to reproduce (this might
not be feasible since I'm not sure I have anything similar to your
hardware available).

Roger.
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