From owner-freebsd-virtualization@freebsd.org Sun May 16 21:01:07 2021
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Subject: Problem reports for virtualization@FreeBSD.org that need special
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Date: Sun, 16 May 2021 21:00:50 +0000
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To view an individual PR, use:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=(Bug Id).
The following is a listing of current problems submitted by FreeBSD users,
which need special attention. These represent problem reports covering
all versions including experimental development code and obsolete releases.
Status | Bug Id | Description
------------+-----------+---------------------------------------------------
In Progress | 247208 | mpt(4): VMWare virtualized LSI controller panics
New | 240945 | [hyper-v] [netvsc] hn network driver incorrectly
2 problems total for which you should take action.
From owner-freebsd-virtualization@freebsd.org Mon May 17 04:12:26 2021
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Date: Mon, 17 May 2021 08:47:11 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Wei Hu <weh@microsoft.com>
Cc: Harry Schmalzbauer <freebsd@omnilan.de>, Chris Knight <stryqx@gmail.com>,
"freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org>
Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
Message-ID: <YKIDX/PjOlNc+tMa@kib.kiev.ua>
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On Mon, May 17, 2021 at 04:12:20AM +0000, Wei Hu wrote:
> Copy Kib who was the author of PTI and other relate patches.
>
> This looks to be caused by Meltdown and Spectre mitigation patches which were
> checked into head couple years ago. See this link for details about these patches:
> https://wiki.freebsd.org/SpeculativeExecutionVulnerabilities
>
> The amd64 patches also caused problems
> on Hyper-V (triple fault) when vmbus and other HyperV drivers (netvsc, storvsc etc)
> were loaded separately. The workaround for this on amd64 is either build these
> Hyper-V modules into the kernel or completely disable mitigation by
> setting vm.pmap.pti="0" in /boot/loader.conf in the affect FreeBSD guests.
>
For amd64 I posted the patch to supposedly fix the issue, you did not
responded.
> It looks the problem on i386 guests is different. While multiple patches have been
> checked in for amd64, there was only one patch r332489 for i386. I am not sure
> whether there is similar vm.pmap.pti option to disable the patch for i386 or not.
>
> I am not familiar to these patches.
>
> @ Kib, will you be able to comment on this?
>
> Thanks,
> Wei
>
>
>
> > -----Original Message-----
> > From: Harry Schmalzbauer <freebsd@omnilan.de>
> > Sent: Sunday, May 16, 2021 2:55 AM
> > To: Wei Hu <weh@microsoft.com>; Chris Knight <stryqx@gmail.com>; freebsd-
> > virtualization@freebsd.org
> > Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
> >
> > Am 14.05.2021 um 18:44 schrieb Harry Schmalzbauer:
> > > Am 16.10.2020 um 11:35 schrieb Wei Hu via freebsd-virtualization:
> > >>> :
> > >>>
> > >> Did you try 12.0? Maybe something changed in 12.x causes failure.
> > >> I386 is not well tested on Hyper-V. I will try to reproduce and take
> > >> a look.
> > >
> > > The regression happened before 12.0.
> > > Today I stumbled across this problem too and tried 11.4 (/May 8th,
> > > 2020) /sucessfully, while 12.0 (/Oct 19th, 2018)/ is failing with i386
> > > releases.
> > >
> > > One commit which is in 12 but not in 11.4 is r332489.
> > >
> > :
> > :
> > :
> > > Unfortunately beyond my skills.
> >
> > In sys/x86/x86/local_apic.c, I added this debug printf:
> > Â Â Â Â Â Â Â for (idx = IPI_DYN_FIRST; idx <= IPI_DYN_LAST; idx++) {
> > printf("DEBUG: native_lapic_ipi_alloc(), idx = %i\n", idx);
> > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ip = &idt[idx];
> > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â func = (ip->gd_hioffset << 16) | ip->gd_looffset;
> > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â if ((!pti && func == (uintptr_t)&IDTVEC(rsvd)) ||
> > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â (pti && func == (uintptr_t)&IDTVEC(rsvd_pti))) {
> > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â vector = idx;
> > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â setidt(vector, ipifunc, SDT_APIC, SEL_KPL, GSEL_APIC);
> > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â break;
> > Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â }
> > Â Â Â Â Â Â Â }
> >
> > This is my latest attempt to see if at least the origin of my fault tracing matches.
> > It does.
> >
> > From #define IPI_DYN_FIRSTÂ Â (APIC_IPI_INTS + 9) in sys/x86/include/apicvar.h
> > I expected to see 252, 253 and 254, which I sucessfully verified.
> >
> > Now comes the part I cannot read: (uintptr_t)&IDTVEC(rsvd)
> > IDTVEC(rsvd) seems to be a assembler makro from sys/i386/i386/exception.s
> >
> > But now it doesn't make any sense for me to dig further, I simply do not
> > understand it.
> >
> > Unfortunately having broken i386 support on Hyper-V is not a cosmetic issue.
> > Removing "device hyperv" from kernel gives access to the v-hdd via legacy
> > IDE/ada, but then I have no NIC.
> > Choosing between missing HDD and missing network support is hard
> > nowadays ;-)
> >
> > Any help getting i386 up and running back on Hyper-V highly appreciated! 11.4
> > is the latest working version, all i386-releases starting with 12.0 don't work!
> >
> > Thanks,
> > -harry
>
From owner-freebsd-virtualization@freebsd.org Mon May 17 06:33:25 2021
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From: Wei Hu <weh@microsoft.com>
To: Konstantin Belousov <kostikbel@gmail.com>
CC: Harry Schmalzbauer <freebsd@omnilan.de>, Chris Knight <stryqx@gmail.com>,
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Subject: RE: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
Thread-Topic: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
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> -----Original Message-----
> From: Konstantin Belousov <kostikbel@gmail.com>
> Sent: Monday, May 17, 2021 1:47 PM
> To: Wei Hu <weh@microsoft.com>
> Cc: Harry Schmalzbauer <freebsd@omnilan.de>; Chris Knight
> <stryqx@gmail.com>; freebsd-virtualization@freebsd.org
> Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
>=20
> On Mon, May 17, 2021 at 04:12:20AM +0000, Wei Hu wrote:
> > Copy Kib who was the author of PTI and other relate patches.
> >
> > This looks to be caused by Meltdown and Spectre mitigation patches
> > which were checked into head couple years ago. See this link for detail=
s about
> these patches:
> > https://nam06.safelinks.protection.outlook.com/?url=3Dhttps%3A%2F%2Fwik=
i
> > .freebsd.org%2FSpeculativeExecutionVulnerabilities&data=3D04%7C01%7=
C
> >
> weh%40microsoft.com%7Cd7b33cd5fc774c88310008d918f744c4%7C72f988bf
> 86f14
> >
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> >
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> >
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> amp;re
> > served=3D0
> >
> > The amd64 patches also caused problems on Hyper-V (triple fault) when
> > vmbus and other HyperV drivers (netvsc, storvsc etc) were loaded
> > separately. The workaround for this on amd64 is either build these
> > Hyper-V modules into the kernel or completely disable mitigation by
> > setting vm.pmap.pti=3D"0" in /boot/loader.conf in the affect FreeBSD gu=
ests.
> >
> For amd64 I posted the patch to supposedly fix the issue, you did not
> responded.
>=20
I am sorry I might have missed your review request. Would you please let me=
=20
know the link to the patch or the commit if you already have checked in? I =
will
need to test and inform the parties who got affected.=20
For the issue on i386, any plan to fix it.
Thanks,
Wei
From owner-freebsd-virtualization@freebsd.org Mon May 17 06:47:31 2021
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Date: Mon, 17 May 2021 09:47:22 +0300
From: Konstantin Belousov <kostikbel@gmail.com>
To: Wei Hu <weh@microsoft.com>
Cc: Harry Schmalzbauer <freebsd@omnilan.de>, Chris Knight <stryqx@gmail.com>,
"freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org>
Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
Message-ID: <YKIRelPB9wmtBzzo@kib.kiev.ua>
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On Mon, May 17, 2021 at 06:33:19AM +0000, Wei Hu wrote:
> > -----Original Message-----
> > From: Konstantin Belousov <kostikbel@gmail.com>
> > Sent: Monday, May 17, 2021 1:47 PM
> > To: Wei Hu <weh@microsoft.com>
> > Cc: Harry Schmalzbauer <freebsd@omnilan.de>; Chris Knight
> > <stryqx@gmail.com>; freebsd-virtualization@freebsd.org
> > Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
> >
> > On Mon, May 17, 2021 at 04:12:20AM +0000, Wei Hu wrote:
> > > Copy Kib who was the author of PTI and other relate patches.
> > >
> > > This looks to be caused by Meltdown and Spectre mitigation patches
> > > which were checked into head couple years ago. See this link for details about
> > these patches:
> > > https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwiki
> > > .freebsd.org%2FSpeculativeExecutionVulnerabilities&data=04%7C01%7C
> > >
> > weh%40microsoft.com%7Cd7b33cd5fc774c88310008d918f744c4%7C72f988bf
> > 86f14
> > >
> > 1af91ab2d7cd011db47%7C1%7C0%7C637568272592647219%7CUnknown%7
> > CTWFpbGZsb
> > >
> > 3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%
> > 3D%
> > >
> > 7C1000&sdata=5HjRc67IiHlrpR5bgWwJq9opMwBKudlHJpElsDZkS4A%3D&
> > amp;re
> > > served=0
> > >
> > > The amd64 patches also caused problems on Hyper-V (triple fault) when
> > > vmbus and other HyperV drivers (netvsc, storvsc etc) were loaded
> > > separately. The workaround for this on amd64 is either build these
> > > Hyper-V modules into the kernel or completely disable mitigation by
> > > setting vm.pmap.pti="0" in /boot/loader.conf in the affect FreeBSD guests.
> > >
> > For amd64 I posted the patch to supposedly fix the issue, you did not
> > responded.
> >
> I am sorry I might have missed your review request. Would you please let me
> know the link to the patch or the commit if you already have checked in? I will
> need to test and inform the parties who got affected.
It was mailed for you after your query, then I pinged you several times.
Anyway, look at and try https://reviews.freebsd.org/D30310
>
> For the issue on i386, any plan to fix it.
>
> Thanks,
> Wei
From owner-freebsd-virtualization@freebsd.org Mon May 17 09:40:12 2021
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Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
To: Konstantin Belousov <kostikbel@gmail.com>, Wei Hu <weh@microsoft.com>
Cc: Chris Knight <stryqx@gmail.com>,
"freebsd-virtualization@freebsd.org" <freebsd-virtualization@freebsd.org>
References: <CAHgj5TTKdiOU4bRu3SCBwKqnQaMqxUFynodh5MLBE7+ycBiPYw@mail.gmail.com>
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<YKIDX/PjOlNc+tMa@kib.kiev.ua>
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<YKIRelPB9wmtBzzo@kib.kiev.ua>
From: Harry Schmalzbauer <freebsd@omnilan.de>
Organization: OmniLAN
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Date: Mon, 17 May 2021 11:39:59 +0200
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Am 17.05.2021 um 08:47 schrieb Konstantin Belousov:
> On Mon, May 17, 2021 at 06:33:19AM +0000, Wei Hu wrote:
>>> -----Original Message-----
>>> From: Konstantin Belousov <kostikbel@gmail.com>
>>> Sent: Monday, May 17, 2021 1:47 PM
>>> To: Wei Hu <weh@microsoft.com>
>>> Cc: Harry Schmalzbauer <freebsd@omnilan.de>; Chris Knight
>>> <stryqx@gmail.com>; freebsd-virtualization@freebsd.org
>>> Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
>>>
>>> On Mon, May 17, 2021 at 04:12:20AM +0000, Wei Hu wrote:
:
:
:
>>>> separately. The workaround for this on amd64 is either build these
>>>> Hyper-V modules into the kernel or completely disable mitigation by
>>>> setting vm.pmap.pti="0" in /boot/loader.conf in the affect FreeBSD guests.
>>>>
Just to share some hopefully helpful pre-check's I've done so far:
Disabling PTI via vm.pmap.pti="0" in /boot/loader.conf doesn't make any
difference for the i386 issue (at least x86/x86/local_apic.c always uses
non-pti path; tried nontheless, with identical result).
As far as my analysis isn't completely wrong, the problem is about IDT
pointer.
IDTVEC(rsvd) doesn't match in line 2180 of x86/x86/local_apic.c in
native_lapic_ipi_alloc():
(ip->gd_hioffset << 16) | ip->gd_looffset;
Workign 11.4 shows these values:
11.4-i386 idx 251 (252-1 because no r363527, IPI_SWI) :
hi = (49417) 1100 0001 0000 1001
lo = (5472) 0001 0101 0110 0000
func = 1100 0001 0000 1001 0001 0101 0110 0000
IDTVEC(rsvd) = 1100 0001 0000 1001 0001 0101 0110 0000
== rsvd_pti
stable/13:
i386 idx 252 Nok:
hi = (65472) 1111 1111 1100 0000
lo = (12456) 0011 0000 1010 1000
func = 1111 1111 1100 0000 0011 0000 1010 1000
IDTVEC(rsvd) = 0 1110 0100 1011 1011 1110 1000
== rsvd_pti
My knowledge about IDT and it's handling by OS/FreeBSD is by far not
enough to get a solution/explanation for the above. I couldn't find the
relevant paths in our source code (starting with the lack of basic asm
skills).
For sure I'm missing the important path here, maybe I'm totaly wrong...
if not this hopefully saves you some time.
I noticed r332489 too as a candidate for the regression beteween 12(.0)
and 11(.2+).
I prepared a diff which applies to 11.4 (sources from iso) but
recompiling 11.4 fails currently, I would need to rework the
i386/i386/pmap.c adoption.
:
:
:
>> know the link to the patch or the commit if you already have checked in? I will
>> need to test and inform the parties who got affected.
>
> It was mailed for you after your query, then I pinged you several times.
> Anyway, look at and try https://reviews.freebsd.org/D30310
I applied it to stable/13 and this doesn't make any difference, still
the (ip->gd_hioffset << 16) | ip->gd_looffset; and
(uintptr_t)IDTVEC(rsvd) differ with exactly the same values as shown above.
Thanks for your attention, best regards,
-harry
From owner-freebsd-virtualization@freebsd.org Tue May 18 01:56:29 2021
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Subject: [Bug 246168] Ubuntu 20.04 KVM / QEMU Failure with nested FreeBSD bhyve
Date: Tue, 18 May 2021 01:56:29 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D246168
--- Comment #13 from John Hartley <drum@graphica.com.au> ---
(In reply to Peter Grehan from comment #12)
Hi Peter,
I have been working with Ubuntu team again on this:
https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1876678
and based on further testing have raise issue with upstream QEMU:
https://gitlab.com/qemu-project/qemu/-/issues/337
Just cross linking so issue can be tracked across various components.
Thanks,
John Hartley
--=20
You are receiving this mail because:
You are the assignee for the bug.=
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Subject: Re: [Bug 255043] ena device is not getting enabled post addition in
kernel
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Hi,
This is regarding C5 and above Nitro Hypervisor based instances.
It seems we need to use KVM hypervisor at FreeBSD kernel level along =
with ENA module.
In FreeBSD code I am able to see ENA but not where either in kernel or =
in port seeing KVM hypervisor support for FreeBSD.
Can you please guide me how can I get KVM support in FreeBSD?
Thanks & regards
Shamsher
> On 14-May-2021, at 5:39 PM, bugzilla-noreply@freebsd.org wrote:
>=20
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D255043
>=20
> Mark Linimon <linimon@FreeBSD.org> changed:
>=20
> What |Removed |Added
> =
--------------------------------------------------------------------------=
--
> Assignee|bugs@FreeBSD.org =
|virtualization@FreeBSD.org
>=20
> --=20
> You are receiving this mail because:
> You reported the bug.
From owner-freebsd-virtualization@freebsd.org Tue May 18 16:16:50 2021
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From: bugzilla-noreply@freebsd.org
To: virtualization@FreeBSD.org
Subject: [Bug 254513] virtio_random: random_harvestq spinning on a CPU with
Q35 virtio random device
Date: Tue, 18 May 2021 16:16:50 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D254513
deltatux@kwokinator.com changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |deltatux@kwokinator.com
--- Comment #5 from deltatux@kwokinator.com ---
Just wanted to chime in that I have been experiencing the same issue as wel=
l,
it looks like this issue may be more widespread, I found someone writing ab=
out
this issue while trying to research a workaround for this problem:
https://decomo.info/wiki/en/blog/2021/2021-05-02
I tried applying the workaround as suggested in this bug report by blacklis=
ting
virtio_random in rc.conf and it appears to be working, random_harvestq is no
longer eating up 1 of my VM cores.
However, I'm not sure what the impact is for blacklisting virtio_random...
--=20
You are receiving this mail because:
You are the assignee for the bug.
You are on the CC list for the bug.=
From owner-freebsd-virtualization@freebsd.org Tue May 18 20:51:40 2021
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From: "John Doherty" <bsdlists@jld3.net>
To: freebsd-virtualization@freebsd.org
Subject: increasing bhyve VM_MAXCPU
Date: Tue, 18 May 2021 14:51:22 -0600
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I'm experimenting with bhyve VMs with more than 16 vCPUs on FreeBSD
12.2-RELEASE.
As I understand it, this limit is defined as VM_MAXCPU in
/usr/src/sys/amd64/include/vmm.h. I also understand that as of about two
years ago, it should be possible to increase it beyond 21[1].
I began working on a machine with only eight CPU cores/threads, so
rather than trying to increase VM_MAXCPU, I tried to decrease it, which
seemed to work fine. My procedure was:
edit /usr/src/sys/amd64/include/vmm.h
cd /usr/src/lib/libvmmapi ; make clean ; make ; make install
cd /usr/src/usr.sbin/bhyve ; make clean ; make ; make install
cd /usr/src/usr.sbin/bhyvectl ; make clean ; make ; make install
cd /usr/src/usr.sbin/bhyveload ; make clean ; make ; make install
cd /usr/src ; make buildkernel KERNCONF=JLD ; make installkernel
KERNCONF=JLD
reboot
where JLD is a kernel config file that differs from GENERIC only in the
"ident" line.
I tried several values (1, 2, and 4) for VM_MAXCPU and verified that VMs
with a number of vCPUs less than or equal to the max booted fine and
that VMs with more didn't.
So then I tried increasing VM_MAXCPU on a machine with two CPUs, 14
cores/28 threads each, using the same procedure. I set VM_MAXCPU to 28
and configured a VM with 24 vCPUs but that didn't boot. Also tried
setting the max to 20 and booting a VM with 18 vCPUs but that didn't
work either. In all cases, VMs with 16 or fewer vCPUs continued to boot
fine.
All the tests were done with VMs created before doing any of this stuff.
I am using vm-bhyve to manage VMs. The VMs in these tests were running
one of FreeBSD 12.2-RELEASE, alpine linux 3.13, and debian-testing.
So it seems like I'm overlooking something but I don't know what, or
maybe this just isn't going to work. Anybody have experience actually
doing this?
Thanks very much for any advice or further information.
[1] <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212782>
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Date: Tue, 18 May 2021 16:56:55 -0400
From: Shawn Webb <shawn.webb@hardenedbsd.org>
To: John Doherty <bsdlists@jld3.net>
Cc: freebsd-virtualization@freebsd.org
Subject: Re: increasing bhyve VM_MAXCPU
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On Tue, May 18, 2021 at 02:51:22PM -0600, John Doherty via freebsd-virtuali=
zation wrote:
> I'm experimenting with bhyve VMs with more than 16 vCPUs on FreeBSD
> 12.2-RELEASE.
>=20
> As I understand it, this limit is defined as VM_MAXCPU in
> /usr/src/sys/amd64/include/vmm.h. I also understand that as of about two
> years ago, it should be possible to increase it beyond 21[1].
>=20
> I began working on a machine with only eight CPU cores/threads, so rather
> than trying to increase VM_MAXCPU, I tried to decrease it, which seemed to
> work fine. My procedure was:
>=20
> edit /usr/src/sys/amd64/include/vmm.h
> cd /usr/src/lib/libvmmapi ; make clean ; make ; make install
> cd /usr/src/usr.sbin/bhyve ; make clean ; make ; make install
> cd /usr/src/usr.sbin/bhyvectl ; make clean ; make ; make install
> cd /usr/src/usr.sbin/bhyveload ; make clean ; make ; make install
> cd /usr/src ; make buildkernel KERNCONF=3DJLD ; make installkernel
> KERNCONF=3DJLD
> reboot
>=20
> where JLD is a kernel config file that differs from GENERIC only in the
> "ident" line.
>=20
> I tried several values (1, 2, and 4) for VM_MAXCPU and verified that VMs
> with a number of vCPUs less than or equal to the max booted fine and that
> VMs with more didn't.
>=20
> So then I tried increasing VM_MAXCPU on a machine with two CPUs, 14 cores=
/28
> threads each, using the same procedure. I set VM_MAXCPU to 28 and configu=
red
> a VM with 24 vCPUs but that didn't boot. Also tried setting the max to 20
> and booting a VM with 18 vCPUs but that didn't work either. In all cases,
> VMs with 16 or fewer vCPUs continued to boot fine.
>=20
> All the tests were done with VMs created before doing any of this stuff. I
> am using vm-bhyve to manage VMs. The VMs in these tests were running one =
of
> FreeBSD 12.2-RELEASE, alpine linux 3.13, and debian-testing.
>=20
> So it seems like I'm overlooking something but I don't know what, or maybe
> this just isn't going to work. Anybody have experience actually doing thi=
s?
>=20
> Thanks very much for any advice or further information.
HardenedBSD bumped max vCPUs up to 48 in a recent commit[0]. Our
14-CURRENT/amd64 package building VM is set up with 30 (out of 36
available) vCPUs (`vmrun.sh -c 30`). We've completed one full package
build (so, 31,000+ ports) without issue. The one package building VM
we have on the system (so no other VMs) is running HardenedBSD
14-CURRENT. Meaning, we don't run anything other than HardenedBSD VMs.
[0]: https://git.hardenedbsd.org/hardenedbsd/HardenedBSD/-/issues/30
Thanks,
--=20
Shawn Webb
Cofounder / Security Engineer
HardenedBSD
https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A=
4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc
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Message-Id: <202105190121.14J1L3BV001126@gndrsh.dnsmgr.net>
Subject: Re: increasing bhyve VM_MAXCPU
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> I'm experimenting with bhyve VMs with more than 16 vCPUs on FreeBSD
> 12.2-RELEASE.
>
> As I understand it, this limit is defined as VM_MAXCPU in
> /usr/src/sys/amd64/include/vmm.h. I also understand that as of about two
> years ago, it should be possible to increase it beyond 21[1].
>
> I began working on a machine with only eight CPU cores/threads, so
> rather than trying to increase VM_MAXCPU, I tried to decrease it, which
> seemed to work fine. My procedure was:
>
> edit /usr/src/sys/amd64/include/vmm.h
cp /usr/src/sys/amd64/include/vmm.h /usr/include/machine/vmm.h
> cd /usr/src/lib/libvmmapi ; make clean ; make ; make install
> cd /usr/src/usr.sbin/bhyve ; make clean ; make ; make install
> cd /usr/src/usr.sbin/bhyvectl ; make clean ; make ; make install
> cd /usr/src/usr.sbin/bhyveload ; make clean ; make ; make install
All of this code you built used the old value as you did not
propogate your change to vmm.h to the installed system, since
your running individual make commands the includes in /usr/include
are used.
> cd /usr/src ; make buildkernel KERNCONF=JLD ; make installkernel
> KERNCONF=JLD
> reboot
Your kernel has the new value you put in vmm.h, so now you
have created a userland/kernel missmatch on some data structures.
>
> where JLD is a kernel config file that differs from GENERIC only in the
> "ident" line.
>
> I tried several values (1, 2, and 4) for VM_MAXCPU and verified that VMs
> with a number of vCPUs less than or equal to the max booted fine and
> that VMs with more didn't.
>
> So then I tried increasing VM_MAXCPU on a machine with two CPUs, 14
> cores/28 threads each, using the same procedure. I set VM_MAXCPU to 28
> and configured a VM with 24 vCPUs but that didn't boot. Also tried
> setting the max to 20 and booting a VM with 18 vCPUs but that didn't
> work either. In all cases, VMs with 16 or fewer vCPUs continued to boot
> fine.
>
> All the tests were done with VMs created before doing any of this stuff.
> I am using vm-bhyve to manage VMs. The VMs in these tests were running
> one of FreeBSD 12.2-RELEASE, alpine linux 3.13, and debian-testing.
>
> So it seems like I'm overlooking something but I don't know what, or
> maybe this just isn't going to work. Anybody have experience actually
> doing this?
>
> Thanks very much for any advice or further information.
>
> [1] <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212782>
> _______________________________________________
> freebsd-virtualization@freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization
> To unsubscribe, send any mail to "freebsd-virtualization-unsubscribe@freebsd.org"
>
--
Rod Grimes rgrimes@freebsd.org
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Subject: Re: increasing bhyve VM_MAXCPU
In-Reply-To: <20210518205655.2nnjt4yfdt43atby@mutt-hbsd>
To: Shawn Webb <shawn.webb@hardenedbsd.org>
Date: Tue, 18 May 2021 18:22:58 -0700 (PDT)
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-- Start of PGP signed section.
> On Tue, May 18, 2021 at 02:51:22PM -0600, John Doherty via freebsd-virtualization wrote:
> > I'm experimenting with bhyve VMs with more than 16 vCPUs on FreeBSD
> > 12.2-RELEASE.
> >
> > As I understand it, this limit is defined as VM_MAXCPU in
> > /usr/src/sys/amd64/include/vmm.h. I also understand that as of about two
> > years ago, it should be possible to increase it beyond 21[1].
> >
> > I began working on a machine with only eight CPU cores/threads, so rather
> > than trying to increase VM_MAXCPU, I tried to decrease it, which seemed to
> > work fine. My procedure was:
> >
> > edit /usr/src/sys/amd64/include/vmm.h
> > cd /usr/src/lib/libvmmapi ; make clean ; make ; make install
> > cd /usr/src/usr.sbin/bhyve ; make clean ; make ; make install
> > cd /usr/src/usr.sbin/bhyvectl ; make clean ; make ; make install
> > cd /usr/src/usr.sbin/bhyveload ; make clean ; make ; make install
> > cd /usr/src ; make buildkernel KERNCONF=JLD ; make installkernel
> > KERNCONF=JLD
> > reboot
> >
> > where JLD is a kernel config file that differs from GENERIC only in the
> > "ident" line.
> >
> > I tried several values (1, 2, and 4) for VM_MAXCPU and verified that VMs
> > with a number of vCPUs less than or equal to the max booted fine and that
> > VMs with more didn't.
> >
> > So then I tried increasing VM_MAXCPU on a machine with two CPUs, 14 cores/28
> > threads each, using the same procedure. I set VM_MAXCPU to 28 and configured
> > a VM with 24 vCPUs but that didn't boot. Also tried setting the max to 20
> > and booting a VM with 18 vCPUs but that didn't work either. In all cases,
> > VMs with 16 or fewer vCPUs continued to boot fine.
> >
> > All the tests were done with VMs created before doing any of this stuff. I
> > am using vm-bhyve to manage VMs. The VMs in these tests were running one of
> > FreeBSD 12.2-RELEASE, alpine linux 3.13, and debian-testing.
> >
> > So it seems like I'm overlooking something but I don't know what, or maybe
> > this just isn't going to work. Anybody have experience actually doing this?
> >
> > Thanks very much for any advice or further information.
>
> HardenedBSD bumped max vCPUs up to 48 in a recent commit[0]. Our
> 14-CURRENT/amd64 package building VM is set up with 30 (out of 36
> available) vCPUs (`vmrun.sh -c 30`). We've completed one full package
> build (so, 31,000+ ports) without issue. The one package building VM
> we have on the system (so no other VMs) is running HardenedBSD
> 14-CURRENT. Meaning, we don't run anything other than HardenedBSD VMs.
>
> [0]: https://git.hardenedbsd.org/hardenedbsd/HardenedBSD/-/issues/30
When I made the changes to fix the brokeness at 21 vCPU we (Michael Dexter
and myself) did testing into the 200's of vcpu's. Note that many guests
have problems at such large core counts, but bhyve itself behaved ok, but
some what sluggish as iirc the testing was done on a 32 core system.
> Thanks,
>
> --
> Shawn Webb
> Cofounder / Security Engineer
> HardenedBSD
>
> https://git.hardenedbsd.org/hardenedbsd/pubkeys/-/raw/master/Shawn_Webb/03A4CBEBB82EA5A67D9F3853FF2E67A277F8E1FA.pub.asc
-- End of PGP section, PGP failed!
--
Rod Grimes rgrimes@freebsd.org
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From: "John Doherty" <bsdlists@jld3.net>
To: "Rodney W. Grimes" <freebsd-rwg@gndrsh.dnsmgr.net>
Cc: freebsd-virtualization@freebsd.org
Subject: Re: increasing bhyve VM_MAXCPU
Date: Tue, 18 May 2021 20:45:42 -0600
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On 18 May 2021, at 19:21, Rodney W. Grimes wrote:
>> I'm experimenting with bhyve VMs with more than 16 vCPUs on FreeBSD
>> I began working on a machine with only eight CPU cores/threads, so
>> rather than trying to increase VM_MAXCPU, I tried to decrease it, which
>> seemed to work fine. My procedure was:
>>
>> edit /usr/src/sys/amd64/include/vmm.h
>
> cp /usr/src/sys/amd64/include/vmm.h /usr/include/machine/vmm.h
Thanks so much for this. Things are now working fine, e.g.:
[root@fbsd1] # grep 'Multiprocessor System Detected' /var/run/dmesg.boot
FreeBSD/SMP: Multiprocessor System Detected: 24 CPUs
From owner-freebsd-virtualization@freebsd.org Wed May 19 06:53:24 2021
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Subject: [Bug 221074] Hyper V Gen 2 install has no mouse
Date: Wed, 19 May 2021 06:53:23 +0000
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221074
--- Comment #23 from Michael <michael.adm@gmail.com> ---
(In reply to Wei Hu from comment #21)
I noticed an interesting point.
We have only two Gen2 VMs on the hypervisor.
We turn on the first VM. The keyboard works for a day or two normally, it d=
oes
not disappear.
We turn on the second VM and run buildworld in it, for example.
In the first VM, the keyboard disappears in just a minute.
Maybe this will help to identify this nasty bug.
--=20
You are receiving this mail because:
You are the assignee for the bug.=
From owner-freebsd-virtualization@freebsd.org Wed May 19 11:26:22 2021
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Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
From: Harry Schmalzbauer <freebsd@omnilan.de>
To: Konstantin Belousov <kostikbel@gmail.com>, Wei Hu <weh@microsoft.com>
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Am 17.05.2021 um 11:39 schrieb Harry Schmalzbauer:
> Am 17.05.2021 um 08:47 schrieb Konstantin Belousov:
>> On Mon, May 17, 2021 at 06:33:19AM +0000, Wei Hu wrote:
>>>> -----Original Message-----
>>>> From: Konstantin Belousov <kostikbel@gmail.com>
>>>> Sent: Monday, May 17, 2021 1:47 PM
>>>> To: Wei Hu <weh@microsoft.com>
>>>> Cc: Harry Schmalzbauer <freebsd@omnilan.de>; Chris Knight
>>>> <stryqx@gmail.com>; freebsd-virtualization@freebsd.org
>>>> Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
>>>>
>>>> On Mon, May 17, 2021 at 04:12:20AM +0000, Wei Hu wrote:
> :
> :
> :
>>>>> separately. The workaround for this on amd64 is either build these
>>>>> Hyper-V modules into the kernel or completely disable mitigation by
>>>>> setting vm.pmap.pti="0" in /boot/loader.conf in the affect FreeBSD
>>>>> guests.
>>>>>
>
> Just to share some hopefully helpful pre-check's I've done so far:
>
> Disabling PTI via vm.pmap.pti="0" in /boot/loader.conf doesn't make
> any difference for the i386 issue (at least x86/x86/local_apic.c
> always uses non-pti path; tried nontheless, with identical result).
>
> As far as my analysis isn't completely wrong, the problem is about IDT
> pointer.
> IDTVEC(rsvd) doesn't match in line 2180 of x86/x86/local_apic.c in
> native_lapic_ipi_alloc():
> (ip->gd_hioffset << 16) | ip->gd_looffset;
>
I managed to setup an i386 vm with -current from 3 years ago (not the
most straight forward task due to compiler infrastructure changes back
then).
Up to r332488 vmbus(4) resp. hyperv(4) is working fine.
Updating r332488 to r332489 breaks like already described.
Since r332489 is a huge patch with lots of x86 art, the only chance I
see, how this can be resolved, is with Konstantin's help.
I can just assure that I tracked it down to the single r332489 committ
which makes vmbus(4) failing on i386.
Verification done:
- built/installed world&kernel on i386 HyV guest with r332488
 reboot fine.
- built/installed kernel on the same vm after svnlite up -r 332489
 reboot fails with "vmbus0: cannot find free IDT vector"
- loaded kernel.old/kernel, did revert 332489, by 'svnlite up -r 332488'
and compiled/reinstalled kernel (again r332488)
 reboot fine.
I tried to revert r332489 on stable/13 but failed due to lots of
conflicting changes (including CVE driven) affecting the same area.
To summarize: r332489 only breaks i386 native_lapic_ipi_alloc(), amd64
is not affected (but haven't checked if PTI has any influence on amd64).
The effect is 100% reproducable.
Happy to test any suggestion or debug extension!
Thanks,
-harry
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Subject: [Bug 221074] Hyper V Gen 2 install has no mouse
Date: Thu, 20 May 2021 03:29:41 +0000
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--- Comment #24 from Wei Hu <weh@microsoft.com> ---
(In reply to Michael from comment #23)
I also have a Gen2 VM running for a while. I used it to developed a FreeBSD
kernel module last year, and I left it running since then. I admit I don't
directly use console often. But every time I open the console, the keyboard
always works. I will leave the console open for a few days to see if it hit=
the
same problem you are seeing. The VM is at r366933 with some additional chan=
ges
I made irrelevant to keyboard. So it should has the same problem as you hav=
e.
In the meantime, if you can problem more information about how to reproduce=
it,
such as the kind of operation you are using on the consoles, and Hyper-V
version, it may help.
--=20
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You are the assignee for the bug.=
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Subject: [Bug 221074] Hyper V Gen 2 install has no mouse
Date: Thu, 20 May 2021 09:54:31 +0000
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--- Comment #25 from Michael <michael.adm@gmail.com> ---
(In reply to Wei Hu from comment #24)
Windows Hyper-V 2019 Server 10.0.17763
(KB4586875, KB4494174, KB4523204, KB4539571, KB4549947, KB4558997, KB456160=
0,
KB4562562, KB4580325, KB4587735, KB4592440)
All VMs of the Gen2 version (about 10 VMs, the load on the hypervisor is ab=
out
50%, 2x Intel Xeon E5-2623 v3).
Most FreeBSD 13.0-CURRENT (GENERIC) VMs and two FreeBSD 14.0-CURRENT (GENER=
IC)
VMs have their kernel updated yesterday. All FreeBSD VMs in the Hyper-V con=
sole
lose their keyboard (there are Linux and Windows VMs - they have everything=
in
order with the keyboard in the Hyper-V console). Another point, I have seve=
ral
hypervisors with approximately the same VM composition and server hardware.=
And
this bug occurs on everyone.
Sometimes the FreeBSD VM keyboard disappears even when not using it.
--=20
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You are the assignee for the bug.=
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Subject: [Bug 221074] Hyper V Gen 2 install has no mouse
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--- Comment #26 from Michael <michael.adm@gmail.com> ---
(In reply to Michael from comment #25)
I forgot to say that all VMs have Mellanox ConnectX-3 and Mellanox ConnectX=
-4
network cards with SR-IOV enabled (all VMs have network cards with active
SR-IOVs).
--=20
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Subject: [Bug 221074] Hyper V Gen 2 install has no mouse
Date: Thu, 20 May 2021 16:07:26 +0000
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Harald Schmalzbauer <bugzilla.freebsd@omnilan.de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bugzilla.freebsd@omnilan.de
--- Comment #27 from Harald Schmalzbauer <bugzilla.freebsd@omnilan.de> ---
(In reply to Michael from comment #25)
Only asking about "keyboard disappears":
Do you get detach kernel messages, or is it just unresponsive?
The latter may be due to scrollLock state-sync by the HyV-Console-App.
If I have no responsive keyboard, toggling ScrolLock fixes it. Also I
regularly get CapsLock mismatch between guest and host console - meaning the
tty inside the HyperV console has CapsLock active, while notepad on the des=
k,
which runs HyV Console, doesn't behave like CapsLock is active. If I toggle
CapLock from inside tty, guest console is totally fine but everything else
behaves like CapsLock is active.
Might be special side effect caused by RDP (only use RDP to win hosts), nev=
er
investigated further because it's just a minor issue and isolated to
HyV-Console-App.
-harry
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Subject: [Bug 221074] Hyper V Gen 2 install has no mouse
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D221074
--- Comment #28 from Michael <michael.adm@gmail.com> ---
(In reply to Harald Schmalzbauer from comment #27)
> Do you get detach kernel messages, or is it just unresponsive?
No messages. The keyboard just becomes unresponsive.
> The latter may be due to scrollLock state-sync by the HyV-Console-App.
> If I have no responsive keyboard, toggling ScrolLock fixes it.
Not. Combinations and special keys do not react (you can dance on the keybo=
ard
- reactions are zero).
In version 13.0, when the keyboard disappears, messages are displayed on the
console that occur later, but in 14.0, messages freeze in the place where t=
he
keyboard disappeared. At the same time, everything works perfectly over SSH,
like the system itself.
--=20
You are receiving this mail because:
You are the assignee for the bug.=
From owner-freebsd-virtualization@freebsd.org Fri May 21 12:50:35 2021
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Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
From: Harry Schmalzbauer <freebsd@omnilan.de>
To: Konstantin Belousov <kostikbel@gmail.com>, Wei Hu <weh@microsoft.com>
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Am 19.05.2021 um 13:26 schrieb Harry Schmalzbauer:
...
> I can just assure that I tracked it down to the single r332489 committ
> which makes vmbus(4) failing on i386.
> Verification done:
> - built/installed world&kernel on i386 HyV guest with r332488
> Â reboot fine.
> - built/installed kernel on the same vm after svnlite up -r 332489
> Â reboot fails with "vmbus0: cannot find free IDT vector"
> - loaded kernel.old/kernel, did revert 332489, by 'svnlite up -r
> 332488' and compiled/reinstalled kernel (again r332488)
> Â reboot fine.
While having hard time catching up with x86 basics, I found another oddity:
On Hyper-V gen1, the maximum ammount of RAM I can assign a FreeBSD guest
beeing able to boot i386 is 3914MB, startring with r332489.
As soon as I configure the guest to have 3916MB or more, FreeBSD-i386
r332489 booting leads to guest reset. Loader starts kernel, machine
reboots.
Either reverting to r332488 or reducing guest-RAM solves this.
The most interesting fact here is that I couldn't reproduce it on ESXi.
I ducplicated the Hyper-V HDD and started the exactly same code on
ESXi(v6) guest, where it doesn't crash! I can boot FreeBSD-i386 r332489
with any ammount of guest-RAM on ESXi.
(speaking for GENERIC, non-PAE)
Host CPU differs significantly though and I have no possibility to test
this influence. Ther HyperV is Dual-Socket E5-2630 while the ESXi host
is a single socket X3470 Xeon (pre SandyBridge).
Maybe someone has an idea how this affects these symptoms.
Thanks,
-harry
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Subject: Re: FreeBSD 12.1 i386 on Hyper-V Fails to Mount Root
From: Harry Schmalzbauer <freebsd@omnilan.de>
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Am 21.05.2021 um 14:50 schrieb Harry Schmalzbauer:
> Am 19.05.2021 um 13:26 schrieb Harry Schmalzbauer:
>
> ...
>> I can just assure that I tracked it down to the single r332489
>> committ which makes vmbus(4) failing on i386.
>> Verification done:
>> - built/installed world&kernel on i386 HyV guest with r332488
>> Â reboot fine.
>> - built/installed kernel on the same vm after svnlite up -r 332489
>> Â reboot fails with "vmbus0: cannot find free IDT vector"
>> - loaded kernel.old/kernel, did revert 332489, by 'svnlite up -r
>> 332488' and compiled/reinstalled kernel (again r332488)
>> Â reboot fine.
>
> While having hard time catching up with x86 basics, I found another
> oddity:
> On Hyper-V gen1, the maximum ammount of RAM I can assign a FreeBSD
> guest beeing able to boot i386 is 3914MB, startring with r332489.
> As soon as I configure the guest to have 3916MB or more, FreeBSD-i386
> r332489 booting leads to guest reset. Loader starts kernel, machine
> reboots.
> Either reverting to r332488 or reducing guest-RAM solves this.
>
> The most interesting fact here is that I couldn't reproduce it on ESXi.
> I ducplicated the Hyper-V HDD and started the exactly same code on
> ESXi(v6) guest, where it doesn't crash! I can boot FreeBSD-i386
> r332489 with any ammount of guest-RAM on ESXi.
> (speaking for GENERIC, non-PAE)
Now that I have a living r332489 i386 available, I checked some sysctl.
It seems on ESXi and i386, large page mappings aren't used anymore, or
is it just wrong indicating?
These valueas are suspicious to my eyes:
kern.version: FreeBSD 12.0-CURRENT #0 r332489: Fri May 21 15:32:35 CEST 2021
   root@esxtest:/usr/obj/altroot/usr/src/i386.i386/sys/GENERIC
hw.pagesizes: 4096 0
hw.realmem: 0
vm.min_kernel_address: 0
vm.max_kernel_address: 4286578688
vm.kvm_free: -549453824
vm.kvm_size: -16777216
vm.pmap.pg_ps_enabled: 0
kern.version: FreeBSD 12.0-CURRENT #1 r332488: Fri May 21 17:35:58 CEST 2021
   root@esxtest:/usr/obj/altroot/usr/src/i386.i386/sys/GENERIC
hw.pagesizes: 4096 4194304
hw.realmem: 0
vm.min_kernel_address: 3220172800
vm.max_kernel_address: 4294963200
vm.kvm_free: 624947200
vm.kvm_size: 1073737728
vm.pmap.pg_ps_enabled: 1
Thanks for any hints,
-harry