[Bug 278892] virtualization/bhyve: bhyve can't handle ACPI when a nvidia modern GPU in passed within a Windows vm

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=278892

            Bug ID: 278892
           Summary: virtualization/bhyve: bhyve can't handle ACPI when a
                    nvidia modern GPU in passed within a Windows vm
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: Individual Port(s)
          Assignee: ports-bugs@FreeBSD.org
          Reporter: marietto2008@gmail.com

Created attachment 250566
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=250566&action=edit
ACPI / Geforce RTX 2080 ti conflict screenshot.

Hello.

What I would like to understand is why,when I try to pass my RTX 2080 ti from
FreeBSD to Windows 11,it won't do it,causing the error 12. It says that it
generates a resource conflict and requires additional installation).

Now,inside it I still see the error 12 :

The device PCI\VEN_10DE&DEV_1E04&SUBSYS_250319DA&REV_A1\3&61aaa01&0&48
generates a resource conflict and requires additional installation.

I have 3 GPUS. 

The ones you see below :

root@marietto-133:/usr/ports/www/chromium # lspci

00:02.0 Display controller: Intel Corporation CoffeeLake-S GT2 [UHD Graphics
630] (rev 02)

01:00.0 VGA compatible controller: NVIDIA Corporation GP106 [GeForce GTX 1060
3GB] (rev a1)
01:00.1 Audio device: NVIDIA Corporation GP106 High Definition Audio Controller
(rev a1)

02:00.0 VGA compatible controller: NVIDIA Corporation TU102 [GeForce RTX 2080
Ti] (rev a1)
02:00.1 Audio device: NVIDIA Corporation TU102 High Definition Audio Controller
(rev a1)
02:00.2 USB controller: NVIDIA Corporation TU102 USB 3.1 Host Controller (rev
a1)
02:00.3 Serial bus controller: NVIDIA Corporation TU102 USB Type-C UCSI
Controller (rev a1)

What I do is to select (from the BIOS) the Intel or the Nvidia Geforce 1060
GPU,reserving the RTX 2080 ti to a guest os (Linux or Windows),by declaring
this parameter inside the file /boot/loader.conf :

pptdevs="2/0/0 2/0/1 2/0/2 2/0/3"

Take in consideration that IT WORKS inside the Linux vm,but NOT in the Windows
vm,because there are some kinds of conflicts between resources that I need to
understand.

I ran msinfo32 and then I checked the resource sharing and conflicts tab to see
which devices are conflicting with each other and I found something really
interesting (please see the attached picture).

I'm not a developer,but I suspect that a patch is needed for bhyve. Windows
needs that ACPI is enabled within Windows itself,because when I have disabled
(configuring the entries below to Start 4 - disabled) the entries below :

HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\ACPI Start 0
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\AcpiPmi Start 3
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\services\acpitime Start 3

what's happened has been a BSOD : "Unaccessible Boot Device"

I'm not sure if ACPI can be disabled in Windows without to break it
irreversibly.
I will keep trying an answer to this question.

What happens,instead if I keep ACPI enabled in Windows,but disabled in bhyve ?

Windows crashed with the error "Video TDR failed"

The other option would be to develop a patch for bhyve that fix the conflicts
that are shown by Windows ? Maybe bhyve offers a not complete ACPI feature that
should be improved ?

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