CVS commit: src/sys/arch

["Takeshi Nakayama" <nakayama%netbsd.org@localhost>]

Module Name:    src
Committed By:   nakayama
Date:           Mon Nov 13 11:45:54 UTC 2017

Modified Files:
        src/sys/arch/amd64/include: i82093reg.h
        src/sys/arch/i386/include: i82093reg.h
        src/sys/arch/x86/x86: ioapic.c

Log Message:
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:

 https://marc.info/?l=openbsd-cvs&m=146718035432599&w=2

| 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"
| interface.

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.