PR/59618 CVS commit: src/sys/dev/hyperv

["Taylor R Campbell" <riastradh%netbsd.org@localhost>]

The following reply was made to PR kern/59618; it has been noted by GNATS.

From: "Taylor R Campbell" <riastradh%netbsd.org@localhost>
To: gnats-bugs%gnats.NetBSD.org@localhost
Cc: 
Subject: PR/59618 CVS commit: src/sys/dev/hyperv
Date: Sat, 6 Sep 2025 02:56:07 +0000

 Module Name:	src
 Committed By:	riastradh
 Date:		Sat Sep  6 02:56:07 UTC 2025
 
 Modified Files:
 	src/sys/dev/hyperv: vmbus.c
 
 Log Message:
 hyperv(4): Use paravirt_membar_sync(9) where needed.
 
 Annotate each remaining membar_sync with the bus_dmamap_sync that I
 think it really ought to be.  Sprinkle some more annotations of where
 bus_dmamap_sync ought to go.  (Although these likely don't matter --
 except as __insn_barrier equivalents -- for hyperv on x86, and these
 buffers are not likely to ever bounce, the syncs may be needed on Arm
 for the underlying r-before-r/w and r/w-before-w ordering if nothing
 else.)
 
 PR kern/59618: occasional virtio block device lock ups/hangs
 
 (hyperv(4) is not virtio(4) but the same fundamental issue arises.)
 
 
 To generate a diff of this commit:
 cvs rdiff -u -r1.19 -r1.20 src/sys/dev/hyperv/vmbus.c
 
 Please note that diffs are not public domain; they are subject to the
 copyright notices on the relevant files.