NetBSD Problem Report #58194

From www@netbsd.org  Thu Apr 25 12:11:15 2024
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Message-Id: <20240425121114.134FB1A923B@mollari.NetBSD.org>
Date: Thu, 25 Apr 2024 12:11:14 +0000 (UTC)
From: pho@cielonegro.org
Reply-To: pho@cielonegro.org
To: gnats-bugs@NetBSD.org
Subject: aarch64: the vmt(4) driver does not attach to anything
X-Send-Pr-Version: www-1.0

>Number:         58194
>Category:       port-arm
>Synopsis:       aarch64: the vmt(4) driver does not attach to anything
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    port-arm-maintainer
>State:          closed
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Thu Apr 25 12:15:01 +0000 2024
>Closed-Date:    Sat May 11 04:04:30 +0000 2024
>Last-Modified:  Sat May 11 04:04:30 +0000 2024
>Originator:     PHO
>Release:        10.0
>Organization:
TNF
>Environment:
NetBSD yukari.cielonegro.org 10.0 NetBSD 10.0 (GENERIC64) #0: Thu Mar 28 08:33:33 UTC 2024  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/evbarm/compile/GENERIC64 evbarm
>Description:
On NetBSD/aarch64 running as a VMware guest, the vmt(4) driver is supposed to attach to fdt:

> vmt*            at fdt?                 # VMware Tools

but the driver in fact doesn't attach to anything.
>How-To-Repeat:
Boot NetBSD/aarch64 10.0 on VMware.
>Fix:
On this architecture vmt(4) used to search for a node "/hypervisor" in the FDT and probed the VMware hypervisor call only when the node was found. However, things appear to have changed and VMware no longer provides the FDT node.

Since vmt(4) doesn't actually need to read anything from FDT, and the hypervisor call logically resides in virtual CPUs themselves, it would be better to attach it directly to cpu, just like how it's probed on x86.

I have a working patch and I'm going to post it later.

>Release-Note:

>Audit-Trail:
From: PHO <pho@cielonegro.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: port-arm/58194: aarch64: the vmt(4) driver does not attach to
 anything
Date: Thu, 25 Apr 2024 22:34:37 +0900

 This is a multi-part message in MIME format.
 --------------EtlMLmKknJ5iJeuUPyg0BTql
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 Here's the patch.
 --------------EtlMLmKknJ5iJeuUPyg0BTql
 Content-Type: text/x-patch; charset=UTF-8;
  name="0001-port-arm-58194-Resurrect-vmt-4-from-bitrot.patch"
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  filename="0001-port-arm-58194-Resurrect-vmt-4-from-bitrot.patch"
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 --------------EtlMLmKknJ5iJeuUPyg0BTql--

From: PHO <pho@cielonegro.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: port-arm/58194: aarch64: the vmt(4) driver does not attach to
 anything
Date: Thu, 25 Apr 2024 22:38:39 +0900

 Lol, I didn't expect the patch to be base64-encoded. You can read it here:
 https://github.com/depressed-pho/netbsd-src/commit/55976718a2146b58c70d63dfd478879e93668b6a

 I will commit this if nobody objects within a reasonable time period.

From: PHO <pho@cielonegro.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: port-arm/58194: aarch64: the vmt(4) driver does not attach to
 anything
Date: Sat, 27 Apr 2024 00:38:45 +0900

 I have slightly updated my patch. Now vmt(4) on aarch64 can be detached 
 and re-attached without rebooting:
 https://github.com/depressed-pho/netbsd-src/commit/e77bc5757ead7ba78530d1885752f8862e1f67c2

From: PHO <pho@cielonegro.org>
To: gnats-bugs@netbsd.org
Cc: 
Subject: Re: port-arm/58194: aarch64: the vmt(4) driver does not attach to
 anything
Date: Thu, 9 May 2024 21:14:16 +0900

 Committed. Will file a pull-up request later.
 http://mail-index.netbsd.org/source-changes/2024/05/09/msg151245.html

State-Changed-From-To: open->closed
State-Changed-By: pho@NetBSD.org
State-Changed-When: Sat, 11 May 2024 04:04:30 +0000
State-Changed-Why:
I decided not to request a pull-up for this one. Users can just use open-vm-tools no problem.


>Unformatted:

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