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PR/49323 CVS commit: src/sys/arch
The following reply was made to PR kern/49323; it has been noted by GNATS.
From: "Takeshi Nakayama" <nakayama%netbsd.org@localhost>
Subject: PR/49323 CVS commit: src/sys/arch
Date: Mon, 13 Nov 2017 11:45:54 +0000
Module Name: src
Committed By: nakayama
Date: Mon Nov 13 11:45:54 UTC 2017
Don't write a 1 to the read only RIRR bit in the IOAPIC redirection
register to fix "tlp0: filter setup and transmit timeout" observed
on Hyper-V VMs with the Legacy Network Adapter.
From OpenBSD via PR kern/49323:
| Modified files:
| sys/arch/amd64/amd64: ioapic.c
| sys/arch/amd64/include: i82093reg.h
| Log message:
| Don't write a 1 to the RIRR bit in the IOAPIC redirection register. This bit
| is R/O, and although it should not matter what value is written there,
| Hyper-V's emulated IOAPIC interprets a write of 1 in some unexpected way and
| subsequently blocks interrupt delivery. This primarily manifests itself as
| de(4) timeouts when using Hyper-V VMs with the "Legacy Network Adapter"
Tested both amd64 and i386 on Client Hyper-V on Windows 10.
To generate a diff of this commit:
cvs rdiff -u -r1.8 -r1.9 src/sys/arch/amd64/include/i82093reg.h
cvs rdiff -u -r1.10 -r1.11 src/sys/arch/i386/include/i82093reg.h
cvs rdiff -u -r1.53 -r1.54 src/sys/arch/x86/x86/ioapic.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
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