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[src/bouyer-xenpvh]: src/sys/arch/i386/i386 calling stipending() is only need...
details: https://anonhg.NetBSD.org/src/rev/61e6f24bc126
branches: bouyer-xenpvh
changeset: 1024953:61e6f24bc126
user: bouyer <bouyer%NetBSD.org@localhost>
date: Sat Apr 11 12:01:42 2020 +0000
description:
calling stipending() is only needed in the PV case; in PVHVM
hypervisor_callback() will be called again as soon as we enable interrupts.
Use the PVHVM XENINTRSTUB for PV too; asjust Xdoreti as needed.
merge hypervisor_callback with hypervisor_pvhvm_callback. The reetrancy should
not be an issue, as we're already re-enabling events in
do_hupervisor_callback (that it, outside of the critical section).
We now can call Xdoreti in both cases.
diffstat:
sys/arch/i386/i386/spl.S | 14 ++---
sys/arch/i386/i386/vector.S | 106 ++-----------------------------------------
2 files changed, 11 insertions(+), 109 deletions(-)
diffs (223 lines):
diff -r 573b0292c766 -r 61e6f24bc126 sys/arch/i386/i386/spl.S
--- a/sys/arch/i386/i386/spl.S Sat Apr 11 11:56:51 2020 +0000
+++ b/sys/arch/i386/i386/spl.S Sat Apr 11 12:01:42 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: spl.S,v 1.50.4.2 2020/04/11 10:11:31 bouyer Exp $ */
+/* $NetBSD: spl.S,v 1.50.4.3 2020/04/11 12:01:42 bouyer Exp $ */
/*
* Copyright (c) 1998, 2007, 2008 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <machine/asm.h>
-__KERNEL_RCSID(0, "$NetBSD: spl.S,v 1.50.4.2 2020/04/11 10:11:31 bouyer Exp $");
+__KERNEL_RCSID(0, "$NetBSD: spl.S,v 1.50.4.3 2020/04/11 12:01:42 bouyer Exp $");
#include "opt_ddb.h"
#include "opt_spldebug.h"
@@ -236,7 +236,7 @@
#endif
3:
movl %ebx,CPUVAR(ILEVEL)
-#ifdef XEN
+#ifdef XENPV
STIC(%eax)
jz 4f
call _C_LABEL(stipending)
@@ -260,7 +260,7 @@
IDTVEC_END(spllower)
/*
- * Handle return from interrupt after device handler finishes.
+ * Xdoreti: Handle return from interrupt after device handler finishes.
*
* Important registers:
* ebx - cpl to restore
@@ -270,10 +270,8 @@
* called with interrupt disabled.
*/
IDTVEC(doreti)
-#ifndef XENPV
IDEPTH_DECR
popl %ebx /* get previous priority */
-#endif
.Ldoreti_resume_stic:
movl $.Ldoreti_resume,%esi /* address to resume loop at */
.Ldoreti_resume:
@@ -292,7 +290,6 @@
#endif /* XENPV */
#endif /* defined(DEBUG) */
-#if !defined(XENPV)
movl %ebx,%eax
movl CPUVAR(IUNMASK)(,%eax,4),%eax
andl CPUVAR(IPENDING),%eax
@@ -301,7 +298,6 @@
btrl %eax,CPUVAR(IPENDING)
movl CPUVAR(ISOURCES)(,%eax, 4),%eax
jmp *IS_RESUME(%eax)
-#endif
2:
#if defined(XEN)
movl %ebx,%eax
@@ -340,7 +336,7 @@
jnz 9f
HANDLE_DEFERRED_FPU
6:
-#ifdef XEN
+#ifdef XENPV
STIC(%eax)
jz 4f
call _C_LABEL(stipending)
diff -r 573b0292c766 -r 61e6f24bc126 sys/arch/i386/i386/vector.S
--- a/sys/arch/i386/i386/vector.S Sat Apr 11 11:56:51 2020 +0000
+++ b/sys/arch/i386/i386/vector.S Sat Apr 11 12:01:42 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vector.S,v 1.85.6.1 2020/04/10 14:42:00 bouyer Exp $ */
+/* $NetBSD: vector.S,v 1.85.6.2 2020/04/11 12:01:42 bouyer Exp $ */
/*
* Copyright 2002 (c) Wasabi Systems, Inc.
@@ -65,7 +65,7 @@
*/
#include <machine/asm.h>
-__KERNEL_RCSID(0, "$NetBSD: vector.S,v 1.85.6.1 2020/04/10 14:42:00 bouyer Exp $");
+__KERNEL_RCSID(0, "$NetBSD: vector.S,v 1.85.6.2 2020/04/11 12:01:42 bouyer Exp $");
#include "opt_ddb.h"
#include "opt_multiprocessor.h"
@@ -940,38 +940,6 @@
#if defined(XEN)
#define voidop(num)
-#ifdef XENPV
-#define XENINTRSTUB(name, num, early_ack, late_ack, mask, unmask, level_mask) \
-IDTVEC(recurse_ ## name ## num) ;\
- INTR_RECURSE_HWFRAME ;\
- subl $4,%esp ;\
- pushl $T_ASTFLT /* trap # for doing ASTs */ ;\
- INTRENTRY ;\
- movl $_C_LABEL(Xdoreti), %esi; /* we now have a trap frame, so loop using doreti instead */ ;\
-IDTVEC(resume_ ## name ## num) \
- movl $IREENT_MAGIC,TF_ERR(%esp) ;\
- pushl %ebx ;\
- movl CPUVAR(XSOURCES) + (num) * 4,%ebp ;\
- movl $num,CPUVAR(ILEVEL) ;\
- IDEPTH_INCR /* leaves old %esp on stack */ ;\
- STI(%eax) ;\
- movl IS_HANDLERS(%ebp),%ebx ;\
-6: \
- pushl IH_ARG(%ebx) ;\
- call *IH_FUN(%ebx) /* call it */ ;\
- addl $4,%esp /* toss the arg */ ;\
- movl IH_NEXT(%ebx),%ebx /* next handler in chain */ ;\
- testl %ebx,%ebx ;\
- jnz 6b ;\
- \
- CLI(%eax) ;\
- unmask(num) /* unmask it in hardware */ ;\
- late_ack(num) ;\
- IDEPTH_DECR ;\
- popl %ebx ;\
- jmp *%esi /* lower spl and do ASTs */ ;\
-
-#else /* XENPV */
#define XENINTRSTUB(name, num, early_ack, late_ack, mask, unmask, level_mask) \
IDTVEC(recurse_ ## name ## num) ;\
INTR_RECURSE_HWFRAME ;\
@@ -999,8 +967,6 @@
late_ack(num) ;\
jmp _C_LABEL(Xdoreti) /* lower spl and do ASTs */ ;\
-#endif /* XENPV */
-
/*
* Just unmasking the event isn't enough, we also need to
* reassert the event pending bit if needed. For now just call
@@ -1110,80 +1076,20 @@
* activation and restart the handler using the previous one.
*/
ENTRY(hypervisor_callback)
- pushl $0 /* dummy error code */
- pushl $T_ASTFLT
- INTRENTRY
- movl TF_EIP(%esp),%eax
- cmpl $scrit,%eax
- jb 11f
- cmpl $ecrit,%eax
- jb critical_region_fixup
-11: pushl CPUVAR(ILEVEL)
- push %esp
- call do_hypervisor_callback
- add $8,%esp
- xorl %eax,%eax
- movb TF_CS(%esp),%cl
- test $CHK_UPL,%cl /* slow return to ring 2 or 3 */
- je safesti
- movl CPUVAR(ILEVEL),%ebx
- jmp doreti_checkast
-safesti:
- movl CPUVAR(VCPU),%esi
- XEN_UNBLOCK_EVENTS(%esi) /* reenable event callbacks */
-scrit: /**** START OF CRITICAL REGION ****/
- XEN_TEST_PENDING(%esi)
- jnz 14f /* process more events if necessary... */
- INTRFASTEXIT
-critiret:
-14: XEN_BLOCK_EVENTS(%esi)
- jmp 11b
-ecrit: /**** END OF CRITICAL REGION ****/
-/*
- * [How we do the fixup]. We want to merge the current stack frame with the
- * just-interrupted frame. How we do this depends on where in the critical
- * region the interrupted handler was executing, and so how many saved
- * registers are in each frame. We do this quickly using the lookup table
- * 'critical_fixup_table'. For each byte offset in the critical region, it
- * provides the number of bytes which have already been popped from the
- * interrupted stack frame.
- */
-critical_region_fixup:
- cmpl $(critiret-1),%eax /* eip points to iret? */
- jne 1f
- movl $(TF_PUSHSIZE+0x8),%eax
- jmp 2f
-1: xorl %eax,%eax
-2:
- /* %eax contains num bytes popped */
- mov %esp,%esi
- add %eax,%esi /* %esi points at end of src region */
- mov %esp,%edi
- add $(TF_PUSHSIZE+0x8+0xC),%edi /* %edi points at end of dst region */
- mov %eax,%ecx
- shr $2,%ecx /* convert words to bytes */
- je 16f /* skip loop if nothing to copy */
-15: subl $4,%esi /* pre-decrementing copy loop */
- subl $4,%edi
- movl (%esi),%eax
- movl %eax,(%edi)
- loop 15b
-16: movl %edi,%esp /* final %edi is top of merged stack */
- jmp 11b
-END(hypervisor_callback)
-
IDTVEC(hypervisor_pvhvm_callback)
pushl $0 /* dummy error code */
pushl $T_ASTFLT
INTRENTRY
+ pushl CPUVAR(ILEVEL)
push %esp
call do_hypervisor_callback
add $4,%esp
- push CPUVAR(ILEVEL)
IDEPTH_INCR
- cli
+ CLI(%eax)
jmp _C_LABEL(Xdoreti)
IDTVEC_END(hypervisor_pvhvm_callback)
+END(hypervisor_callback)
+
#endif /* XEN */
#ifdef XENPV
/*
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