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Don't write a 1 to the read only RIRR bit in the IOAPIC redirection

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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.
This commit is contained in:
nakayama 2017-11-13 11:45:54 +00:00
parent 59808eaabc
commit eafc5bd35a
3 changed files with 10 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
sys/arch/amd64/include/i82093reg.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: i82093reg.h,v 1.8 2017/05/23 08:54:38 nonaka Exp $ */
/* $NetBSD: i82093reg.h,v 1.9 2017/11/13 11:45:54 nakayama Exp $ */
#include <x86/i82093reg.h>
@ -57,6 +57,7 @@
movq IOAPIC_SC_DATA(%rdi),%r15 ;\
movl (%r15),%esi ;\
orl $IOAPIC_REDLO_MASK,%esi ;\
andl $~IOAPIC_REDLO_RIRR,%esi ;\
movl %esi,(%r15) ;\
movq IS_PIC(%r14),%rdi ;\
ioapic_asm_unlock(num)
@ -73,7 +74,7 @@
movq IOAPIC_SC_DATA(%rdi),%r13 ;\
movl %esi, (%r15) ;\
movl (%r13),%r12d ;\
andl $~IOAPIC_REDLO_MASK,%r12d ;\
andl $~(IOAPIC_REDLO_MASK|IOAPIC_REDLO_RIRR),%r12d ;\
movl %esi,(%r15) ;\
movl %r12d,(%r13) ;\
movq IS_PIC(%r14),%rdi ;\

5
sys/arch/i386/include/i82093reg.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: i82093reg.h,v 1.10 2017/05/23 08:54:39 nonaka Exp $ */
/* $NetBSD: i82093reg.h,v 1.11 2017/11/13 11:45:54 nakayama Exp $ */
#include <x86/i82093reg.h>
@ -48,6 +48,7 @@
movl IOAPIC_SC_DATA(%edi),%ebx ;\
movl (%ebx),%esi ;\
orl $IOAPIC_REDLO_MASK,%esi ;\
andl $~IOAPIC_REDLO_RIRR,%esi ;\
movl %esi,(%ebx) ;\
movl IS_PIC(%ebp),%edi ;\
ioapic_asm_unlock(num)
@ -71,7 +72,7 @@
movl IOAPIC_SC_DATA(%edi),%eax ;\
movl %esi, (%ebx) ;\
movl (%eax),%edx ;\
andl $~IOAPIC_REDLO_MASK,%edx ;\
andl $~(IOAPIC_REDLO_MASK|IOAPIC_REDLO_RIRR),%edx ;\
movl %esi, (%ebx) ;\
movl %edx,(%eax) ;\
movl IS_PIC(%ebp),%edi ;\

7
sys/arch/x86/x86/ioapic.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: ioapic.c,v 1.53 2017/11/04 14:56:48 cherry Exp $ */
/* $NetBSD: ioapic.c,v 1.54 2017/11/13 11:45:54 nakayama Exp $ */
/*-
* Copyright (c) 2000, 2009 The NetBSD Foundation, Inc.
@ -64,7 +64,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: ioapic.c,v 1.53 2017/11/04 14:56:48 cherry Exp $");
__KERNEL_RCSID(0, "$NetBSD: ioapic.c,v 1.54 2017/11/13 11:45:54 nakayama Exp $");
#include "opt_ddb.h"
@ -508,6 +508,7 @@ ioapic_hwmask(struct pic *pic, int pin)
flags = ioapic_lock(sc);
redlo = ioapic_read_ul(sc, IOAPIC_REDLO(pin));
redlo |= IOAPIC_REDLO_MASK;
redlo &= ~IOAPIC_REDLO_RIRR;
ioapic_write_ul(sc, IOAPIC_REDLO(pin), redlo);
ioapic_unlock(sc, flags);
}
@ -548,7 +549,7 @@ ioapic_hwunmask(struct pic *pic, int pin)
flags = ioapic_lock(sc);
redlo = ioapic_read_ul(sc, IOAPIC_REDLO(pin));
redlo &= ~IOAPIC_REDLO_MASK;
redlo &= ~(IOAPIC_REDLO_MASK | IOAPIC_REDLO_RIRR);
ioapic_write_ul(sc, IOAPIC_REDLO(pin), redlo);
ioapic_unlock(sc, flags);
}