From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Steven Rostedt <rostedt@goodmis.org>,
Brian Gerst <brgerst@gmail.com>, Juergen Gross <jgross@suse.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Arnd Bergmann <arnd@arndb.de>, Andy Lutomirski <luto@kernel.org>
Subject: [patch 02/15] x86/entry/64: Add ability to switch to IRQ stacks in idtentry
Date: Tue, 25 Feb 2020 23:47:21 +0100 [thread overview]
Message-ID: <20200225231609.110531538@linutronix.de> (raw)
In-Reply-To: 20200225224719.950376311@linutronix.de
Expand the idtentry macro so it supports switching to interrupt stacks on
64bit. Preparatory change to let regular device interrupts use idtentry
instead of having their own mechanism.
Suggested-by: Andy Lutomirski <luto@kernel.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
arch/x86/entry/entry_64.S | 18 ++++++++++++++----
1 file changed, 14 insertions(+), 4 deletions(-)
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -495,8 +495,9 @@ SYM_CODE_END(spurious_entries_start)
* idtentry_body - Macro to emit code calling the C function
* @cfunc: C function to be called
* @has_error_code: Hardware pushed error code on stack
+ * @irq_stack: Execute @cfunc on the IRQ stack (device interrupts)
*/
-.macro idtentry_body cfunc has_error_code:req
+.macro idtentry_body cfunc has_error_code:req irq_stack:req
call error_entry
UNWIND_HINT_REGS
@@ -508,8 +509,16 @@ SYM_CODE_END(spurious_entries_start)
movq $-1, ORIG_RAX(%rsp) /* no syscall to restart */
.endif
+ .if \irq_stack
+ ENTER_IRQ_STACK old_rsp=%rdi
+ .endif
+
call \cfunc
+ .if \irq_stack
+ LEAVE_IRQ_STACK /* interrupts are disabled */
+ .endif
+
jmp error_exit
.endm
@@ -519,11 +528,12 @@ SYM_CODE_END(spurious_entries_start)
* @asmsym: ASM symbol for the entry point
* @cfunc: C function to be called
* @has_error_code: Hardware pushed error code on stack
+ * @irq_stack: Execute @cfunc on the IRQ stack (device interrupts)
*
* The macro emits code to set up the kernel context for straight forward
* and simple IDT entries. No IST stack, no paranoid entry checks.
*/
-.macro idtentry vector asmsym cfunc has_error_code:req
+.macro idtentry vector asmsym cfunc has_error_code:req irq_stack=0
SYM_CODE_START(\asmsym)
UNWIND_HINT_IRET_REGS offset=\has_error_code*8
ASM_CLAC
@@ -546,7 +556,7 @@ SYM_CODE_START(\asmsym)
.Lfrom_usermode_no_gap_\@:
.endif
- idtentry_body \cfunc \has_error_code
+ idtentry_body \cfunc \has_error_code \irq_stack
_ASM_NOKPROBE(\asmsym)
SYM_CODE_END(\asmsym)
@@ -621,7 +631,7 @@ SYM_CODE_START(\asmsym)
/* Switch to the regular task stack and use the noist entry point */
.Lfrom_usermode_switch_stack_\@:
- idtentry_body noist_\cfunc, has_error_code=0
+ idtentry_body noist_\cfunc, has_error_code=0 irq_stack=0
_ASM_NOKPROBE(\asmsym)
SYM_CODE_END(\asmsym)
next prev parent reply other threads:[~2020-02-25 23:27 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-25 22:47 [patch 00/15] x86/entry: Consolidation - Part V Thomas Gleixner
2020-02-25 22:47 ` [patch 01/15] x86/irq: Convey vector as argument and not in ptregs Thomas Gleixner
2020-02-26 5:13 ` Andy Lutomirski
2020-02-26 5:45 ` Brian Gerst
2020-02-26 20:13 ` Thomas Gleixner
2020-02-26 21:35 ` Andy Lutomirski
2020-02-26 23:50 ` Thomas Gleixner
2020-02-26 21:54 ` Brian Gerst
2020-02-26 23:43 ` Thomas Gleixner
2020-02-27 0:04 ` Brian Gerst
2020-02-25 22:47 ` Thomas Gleixner [this message]
2020-02-25 22:47 ` [patch 03/15] x86/entry: Add IRQENTRY_IRQ macro Thomas Gleixner
2020-02-26 15:05 ` Miroslav Benes
2020-02-25 22:47 ` [patch 04/15] x86/entry: Use idtentry for interrupts Thomas Gleixner
2020-02-25 22:47 ` [patch 05/15] x86/entry: Provide IDTEnTRY_SYSVEC Thomas Gleixner
2020-02-26 6:10 ` Andy Lutomirski
2020-02-26 20:15 ` Thomas Gleixner
2020-02-25 22:47 ` [patch 06/15] x86/entry: Convert APIC interrupts to IDTENTRY_SYSVEC Thomas Gleixner
2020-02-25 22:47 ` [patch 07/15] x86/entry: Convert SMP system vectors " Thomas Gleixner
2020-02-25 22:47 ` [patch 08/15] x86/entry: Convert various system vectors Thomas Gleixner
2020-02-25 22:47 ` [patch 09/15] x86/entry: Convert KVM vectors to IDTENTRY_SYSVEC Thomas Gleixner
2020-02-26 10:54 ` Paolo Bonzini
2020-02-25 22:47 ` [patch 10/15] x86/entry: Convert various hypervisor " Thomas Gleixner
2020-02-25 22:47 ` [patch 11/15] x86/entry: Convert XEN hypercall vector " Thomas Gleixner
2020-02-25 22:47 ` [patch 12/15] x86/entry: Remove the apic/BUILD interrupt leftovers Thomas Gleixner
2020-02-25 22:47 ` [patch 13/15] x86/entry/32: Remove redundant irq disable code Thomas Gleixner
2020-02-25 22:47 ` [patch 14/15] x86/entry: Provide return_from exception() Thomas Gleixner
2020-02-25 22:47 ` [patch 15/15] x86/entry: Use return_from_exception() Thomas Gleixner
2020-02-26 9:53 ` [patch 00/15] x86/entry: Consolidation - Part V Peter Zijlstra
2020-02-26 10:02 ` Peter Zijlstra
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