From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, "Paul E. McKenney" <paulmck@kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Alexandre Chartre <alexandre.chartre@oracle.com>,
Frederic Weisbecker <frederic@kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Petr Mladek <pmladek@suse.com>,
Steven Rostedt <rostedt@goodmis.org>,
Joel Fernandes <joel@joelfernandes.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Juergen Gross <jgross@suse.com>, Brian Gerst <brgerst@gmail.com>,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
Will Deacon <will@kernel.org>,
Tom Lendacky <thomas.lendacky@amd.com>,
Wei Liu <wei.liu@kernel.org>,
Michael Kelley <mikelley@microsoft.com>,
Jason Chen CJ <jason.cj.chen@intel.com>,
Zhao Yakui <yakui.zhao@intel.com>,
"Peter Zijlstra (Intel)" <peterz@infradead.org>
Subject: [patch V6 31/37] x86/entry: Remove the apic/BUILD interrupt leftovers
Date: Sat, 16 May 2020 01:46:18 +0200 [thread overview]
Message-ID: <20200515235127.498652915@linutronix.de> (raw)
In-Reply-To: 20200515234547.710474468@linutronix.de
Remove all the code which was there to emit the system vector stubs. All
users are gone.
Move the now unused GET_CR2_INTO macro muck to head_64.S where the last
user is. Fixup the eye hurting comment there while at it.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/arch/x86/entry/calling.h b/arch/x86/entry/calling.h
index 98da0d3c0b1a..4208c1e3f601 100644
--- a/arch/x86/entry/calling.h
+++ b/arch/x86/entry/calling.h
@@ -351,23 +351,3 @@ For 32-bit we have the following conventions - kernel is built with
call stackleak_erase
#endif
.endm
-
-/*
- * This does 'call enter_from_user_mode' unless we can avoid it based on
- * kernel config or using the static jump infrastructure.
- */
-.macro CALL_enter_from_user_mode
-#ifdef CONFIG_CONTEXT_TRACKING
-#ifdef CONFIG_JUMP_LABEL
- STATIC_JUMP_IF_FALSE .Lafter_call_\@, context_tracking_key, def=0
-#endif
- call enter_from_user_mode
-.Lafter_call_\@:
-#endif
-.endm
-
-#ifdef CONFIG_PARAVIRT_XXL
-#define GET_CR2_INTO(reg) GET_CR2_INTO_AX ; _ASM_MOV %_ASM_AX, reg
-#else
-#define GET_CR2_INTO(reg) _ASM_MOV %cr2, reg
-#endif
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index b84c1c0a2fd8..97b02a776db0 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -1233,24 +1233,6 @@ SYM_FUNC_END(entry_INT80_32)
#endif
.endm
-#define BUILD_INTERRUPT3(name, nr, fn) \
-SYM_FUNC_START(name) \
- ASM_CLAC; \
- pushl $~(nr); \
- SAVE_ALL switch_stacks=1; \
- ENCODE_FRAME_POINTER; \
- TRACE_IRQS_OFF \
- movl %esp, %eax; \
- call fn; \
- jmp ret_from_intr; \
-SYM_FUNC_END(name)
-
-#define BUILD_INTERRUPT(name, nr) \
- BUILD_INTERRUPT3(name, nr, smp_##name); \
-
-/* The include is where all of the SMP etc. interrupts come from */
-#include <asm/entry_arch.h>
-
#ifdef CONFIG_PARAVIRT
SYM_CODE_START(native_iret)
iret
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index 38dc4d1f7a7b..7292525e2557 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -658,108 +658,7 @@ SYM_CODE_END(\asmsym)
*/
#include <asm/idtentry.h>
-/*
- * Interrupt entry helper function.
- *
- * Entry runs with interrupts off. Stack layout at entry:
- * +----------------------------------------------------+
- * | regs->ss |
- * | regs->rsp |
- * | regs->eflags |
- * | regs->cs |
- * | regs->ip |
- * +----------------------------------------------------+
- * | regs->orig_ax = ~(interrupt number) |
- * +----------------------------------------------------+
- * | return address |
- * +----------------------------------------------------+
- */
-SYM_CODE_START(interrupt_entry)
- UNWIND_HINT_IRET_REGS offset=16
- ASM_CLAC
- cld
-
- testb $3, CS-ORIG_RAX+8(%rsp)
- jz 1f
- SWAPGS
- FENCE_SWAPGS_USER_ENTRY
- /*
- * Switch to the thread stack. The IRET frame and orig_ax are
- * on the stack, as well as the return address. RDI..R12 are
- * not (yet) on the stack and space has not (yet) been
- * allocated for them.
- */
- pushq %rdi
-
- /* Need to switch before accessing the thread stack. */
- SWITCH_TO_KERNEL_CR3 scratch_reg=%rdi
- movq %rsp, %rdi
- movq PER_CPU_VAR(cpu_current_top_of_stack), %rsp
-
- /*
- * We have RDI, return address, and orig_ax on the stack on
- * top of the IRET frame. That means offset=24
- */
- UNWIND_HINT_IRET_REGS base=%rdi offset=24
-
- pushq 7*8(%rdi) /* regs->ss */
- pushq 6*8(%rdi) /* regs->rsp */
- pushq 5*8(%rdi) /* regs->eflags */
- pushq 4*8(%rdi) /* regs->cs */
- pushq 3*8(%rdi) /* regs->ip */
- UNWIND_HINT_IRET_REGS
- pushq 2*8(%rdi) /* regs->orig_ax */
- pushq 8(%rdi) /* return address */
-
- movq (%rdi), %rdi
- jmp 2f
-1:
- FENCE_SWAPGS_KERNEL_ENTRY
-2:
- PUSH_AND_CLEAR_REGS save_ret=1
- ENCODE_FRAME_POINTER 8
-
- testb $3, CS+8(%rsp)
- jz 1f
-
- /*
- * IRQ from user mode.
- *
- * We need to tell lockdep that IRQs are off. We can't do this until
- * we fix gsbase, and we should do it before enter_from_user_mode
- * (which can take locks). Since TRACE_IRQS_OFF is idempotent,
- * the simplest way to handle it is to just call it twice if
- * we enter from user mode. There's no reason to optimize this since
- * TRACE_IRQS_OFF is a no-op if lockdep is off.
- */
- TRACE_IRQS_OFF
-
- CALL_enter_from_user_mode
-
-1:
- ENTER_IRQ_STACK old_rsp=%rdi save_ret=1
- /* We entered an interrupt context - irqs are off: */
- TRACE_IRQS_OFF
-
- ret
-SYM_CODE_END(interrupt_entry)
-_ASM_NOKPROBE(interrupt_entry)
-
SYM_CODE_START_LOCAL(common_interrupt_return)
-ret_from_intr:
- DISABLE_INTERRUPTS(CLBR_ANY)
- TRACE_IRQS_OFF
-
- LEAVE_IRQ_STACK
-
- testb $3, CS(%rsp)
- jz retint_kernel
-
- /* Interrupt came from user space */
-.Lretint_user:
- mov %rsp,%rdi
- call prepare_exit_to_usermode
-
SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL)
#ifdef CONFIG_DEBUG_ENTRY
/* Assert that pt_regs indicates user mode. */
@@ -802,23 +701,6 @@ SYM_INNER_LABEL(swapgs_restore_regs_and_return_to_usermode, SYM_L_GLOBAL)
INTERRUPT_RETURN
-/* Returning to kernel space */
-retint_kernel:
-#ifdef CONFIG_PREEMPTION
- /* Interrupts are off */
- /* Check if we need preemption */
- btl $9, EFLAGS(%rsp) /* were interrupts off? */
- jnc 1f
- cmpl $0, PER_CPU_VAR(__preempt_count)
- jnz 1f
- call preempt_schedule_irq
-1:
-#endif
- /*
- * The iretq could re-enable interrupts:
- */
- TRACE_IRQS_IRETQ
-
SYM_INNER_LABEL(restore_regs_and_return_to_kernel, SYM_L_GLOBAL)
#ifdef CONFIG_DEBUG_ENTRY
/* Assert that pt_regs indicates kernel mode. */
@@ -932,31 +814,6 @@ SYM_CODE_END(common_interrupt_return)
_ASM_NOKPROBE(common_interrupt_return)
/*
- * APIC interrupts.
- */
-.macro apicinterrupt3 num sym do_sym
-SYM_CODE_START(\sym)
- UNWIND_HINT_IRET_REGS
- pushq $~(\num)
- call interrupt_entry
- UNWIND_HINT_REGS indirect=1
- call \do_sym /* rdi points to pt_regs */
- jmp ret_from_intr
-SYM_CODE_END(\sym)
-_ASM_NOKPROBE(\sym)
-.endm
-
-/* Make sure APIC interrupt handlers end up in the irqentry section: */
-#define PUSH_SECTION_IRQENTRY .pushsection .irqentry.text, "ax"
-#define POP_SECTION_IRQENTRY .popsection
-
-.macro apicinterrupt num sym do_sym
-PUSH_SECTION_IRQENTRY
-apicinterrupt3 \num \sym \do_sym
-POP_SECTION_IRQENTRY
-.endm
-
-/*
* Reload gs selector with exception handling
* edi: new selector
*
diff --git a/arch/x86/include/asm/entry_arch.h b/arch/x86/include/asm/entry_arch.h
deleted file mode 100644
index 3e841ed5c17a..000000000000
--- a/arch/x86/include/asm/entry_arch.h
+++ /dev/null
@@ -1,12 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0 */
-/*
- * This file is designed to contain the BUILD_INTERRUPT specifications for
- * all of the extra named interrupt vectors used by the architecture.
- * Usually this is the Inter Process Interrupts (IPIs)
- */
-
-/*
- * The following vectors are part of the Linux architecture, there
- * is no hardware IRQ pin equivalent for them, they are triggered
- * through the ICC by us (IPIs)
- */
diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 4bbc770af632..5ad021708849 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -29,15 +29,16 @@
#ifdef CONFIG_PARAVIRT_XXL
#include <asm/asm-offsets.h>
#include <asm/paravirt.h>
+#define GET_CR2_INTO(reg) GET_CR2_INTO_AX ; _ASM_MOV %_ASM_AX, reg
#else
#define INTERRUPT_RETURN iretq
+#define GET_CR2_INTO(reg) _ASM_MOV %cr2, reg
#endif
-/* we are not able to switch in one step to the final KERNEL ADDRESS SPACE
+/*
+ * We are not able to switch in one step to the final KERNEL ADDRESS SPACE
* because we need identity-mapped pages.
- *
*/
-
#define l4_index(x) (((x) >> 39) & 511)
#define pud_index(x) (((x) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
next prev parent reply other threads:[~2020-05-16 0:11 UTC|newest]
Thread overview: 159+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-15 23:45 [patch V6 00/37] x86/entry: Rework leftovers and merge plan Thomas Gleixner
2020-05-15 23:45 ` [patch V6 01/37] tracing/hwlat: Use ktime_get_mono_fast_ns() Thomas Gleixner
2020-05-19 21:26 ` Steven Rostedt
2020-05-19 21:45 ` Thomas Gleixner
2020-05-19 22:18 ` Steven Rostedt
2020-05-20 19:51 ` Thomas Gleixner
2020-05-20 20:14 ` Peter Zijlstra
2020-05-20 22:20 ` Thomas Gleixner
2020-05-15 23:45 ` [patch V6 02/37] tracing/hwlat: Split ftrace_nmi_enter/exit() Thomas Gleixner
2020-05-19 22:23 ` Steven Rostedt
2020-05-15 23:45 ` [patch V6 03/37] nmi, tracing: Provide nmi_enter/exit_notrace() Thomas Gleixner
2020-05-17 5:12 ` Andy Lutomirski
2020-05-19 22:24 ` Steven Rostedt
2020-05-15 23:45 ` [patch V6 04/37] x86: Make hardware latency tracing explicit Thomas Gleixner
2020-05-17 5:36 ` Andy Lutomirski
2020-05-17 8:48 ` Thomas Gleixner
2020-05-18 5:50 ` Andy Lutomirski
2020-05-18 8:03 ` Thomas Gleixner
2020-05-18 20:42 ` Andy Lutomirski
2020-05-18 8:01 ` Peter Zijlstra
2020-05-18 8:05 ` Thomas Gleixner
2020-05-18 8:08 ` Peter Zijlstra
2020-05-20 20:09 ` Thomas Gleixner
2020-05-20 20:14 ` Andy Lutomirski
2020-05-20 22:20 ` Thomas Gleixner
2020-05-15 23:45 ` [patch V6 05/37] genirq: Provide irq_enter/exit_rcu() Thomas Gleixner
2020-05-18 23:06 ` Andy Lutomirski
2020-05-15 23:45 ` [patch V6 06/37] genirq: Provde __irq_enter/exit_raw() Thomas Gleixner
2020-05-18 23:07 ` Andy Lutomirski
2020-05-15 23:45 ` [patch V6 07/37] x86/entry: Provide helpers for execute on irqstack Thomas Gleixner
2020-05-18 23:11 ` Andy Lutomirski
2020-05-18 23:46 ` Andy Lutomirski
2020-05-18 23:53 ` Thomas Gleixner
2020-05-18 23:56 ` Andy Lutomirski
2020-05-20 12:35 ` Thomas Gleixner
2020-05-20 15:09 ` Andy Lutomirski
2020-05-20 15:27 ` Thomas Gleixner
2020-05-20 15:36 ` Andy Lutomirski
2020-05-18 23:51 ` Thomas Gleixner
2020-05-15 23:45 ` [patch V6 08/37] x86/entry/64: Move do_softirq_own_stack() to C Thomas Gleixner
2020-05-18 23:48 ` Andy Lutomirski
2020-05-15 23:45 ` [patch V6 09/37] x86/entry: Split idtentry_enter/exit() Thomas Gleixner
2020-05-18 23:49 ` Andy Lutomirski
2020-05-19 8:25 ` Thomas Gleixner
2020-05-15 23:45 ` [patch V6 10/37] x86/entry: Switch XEN/PV hypercall entry to IDTENTRY Thomas Gleixner
2020-05-19 17:06 ` Andy Lutomirski
2020-05-19 18:57 ` Thomas Gleixner
2020-05-19 19:44 ` Andy Lutomirski
2020-05-20 8:06 ` Jürgen Groß
2020-05-20 11:31 ` Andrew Cooper
2020-05-20 14:13 ` Thomas Gleixner
2020-05-20 15:16 ` Andy Lutomirski
2020-05-20 17:22 ` Andy Lutomirski
2020-05-20 19:16 ` Thomas Gleixner
2020-05-20 23:21 ` Andy Lutomirski
2020-05-21 10:45 ` Thomas Gleixner
2020-05-21 2:23 ` Boris Ostrovsky
2020-05-21 7:08 ` Thomas Gleixner
2020-05-15 23:45 ` [patch V6 11/37] x86/entry/64: Simplify idtentry_body Thomas Gleixner
2020-05-19 17:06 ` Andy Lutomirski
2020-05-15 23:45 ` [patch V6 12/37] x86/entry: Provide idtentry_entry/exit_cond_rcu() Thomas Gleixner
2020-05-19 17:08 ` Andy Lutomirski
2020-05-19 19:00 ` Thomas Gleixner
2020-05-19 20:20 ` Thomas Gleixner
2020-05-19 20:24 ` Andy Lutomirski
2020-05-19 21:20 ` Thomas Gleixner
2020-05-20 0:26 ` Andy Lutomirski
2020-05-20 2:23 ` Paul E. McKenney
2020-05-20 15:36 ` Andy Lutomirski
2020-05-20 16:51 ` Andy Lutomirski
2020-05-20 18:05 ` Paul E. McKenney
2020-05-20 19:49 ` Thomas Gleixner
2020-05-20 22:15 ` Paul E. McKenney
2020-05-20 23:25 ` Paul E. McKenney
2020-05-21 8:31 ` Thomas Gleixner
2020-05-21 13:39 ` Paul E. McKenney
2020-05-21 18:41 ` Thomas Gleixner
2020-05-21 19:04 ` Paul E. McKenney
2020-05-20 18:32 ` Thomas Gleixner
2020-05-20 19:24 ` Thomas Gleixner
2020-05-20 19:42 ` Paul E. McKenney
2020-05-20 17:38 ` Paul E. McKenney
2020-05-20 17:47 ` Andy Lutomirski
2020-05-20 18:11 ` Paul E. McKenney
2020-05-20 14:19 ` Thomas Gleixner
2020-05-27 8:12 ` [tip: x86/entry] " tip-bot2 for Thomas Gleixner
2020-05-15 23:46 ` [patch V6 13/37] x86/entry: Switch page fault exception to IDTENTRY_RAW Thomas Gleixner
2020-05-19 20:12 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 14/37] x86/entry: Remove the transition leftovers Thomas Gleixner
2020-05-19 20:13 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 15/37] x86/entry: Change exit path of xen_failsafe_callback Thomas Gleixner
2020-05-19 20:14 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 16/37] x86/entry/64: Remove error_exit Thomas Gleixner
2020-05-19 20:14 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 17/37] x86/entry/32: Remove common_exception Thomas Gleixner
2020-05-19 20:14 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 18/37] x86/irq: Use generic irq_regs implementation Thomas Gleixner
2020-05-15 23:46 ` [patch V6 19/37] x86/irq: Convey vector as argument and not in ptregs Thomas Gleixner
2020-05-19 20:19 ` Andy Lutomirski
2020-05-21 13:22 ` Thomas Gleixner
2020-05-22 18:48 ` Boris Ostrovsky
2020-05-22 19:26 ` Josh Poimboeuf
2020-05-22 19:54 ` Thomas Gleixner
2020-05-15 23:46 ` [patch V6 20/37] x86/irq/64: Provide handle_irq() Thomas Gleixner
2020-05-19 20:21 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 21/37] x86/entry: Add IRQENTRY_IRQ macro Thomas Gleixner
2020-05-19 20:27 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 22/37] x86/entry: Use idtentry for interrupts Thomas Gleixner
2020-05-19 20:28 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 23/37] x86/entry: Provide IDTENTRY_SYSVEC Thomas Gleixner
2020-05-20 0:29 ` Andy Lutomirski
2020-05-20 15:07 ` Thomas Gleixner
2020-05-15 23:46 ` [patch V6 24/37] x86/entry: Convert APIC interrupts to IDTENTRY_SYSVEC Thomas Gleixner
2020-05-20 0:27 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 25/37] x86/entry: Convert SMP system vectors " Thomas Gleixner
2020-05-20 0:28 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 26/37] x86/entry: Convert various system vectors Thomas Gleixner
2020-05-20 0:30 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 27/37] x86/entry: Convert KVM vectors to IDTENTRY_SYSVEC Thomas Gleixner
2020-05-20 0:30 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 28/37] x86/entry: Convert various hypervisor " Thomas Gleixner
2020-05-20 0:31 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 29/37] x86/entry: Convert XEN hypercall vector " Thomas Gleixner
2020-05-20 0:31 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 30/37] x86/entry: Convert reschedule interrupt to IDTENTRY_RAW Thomas Gleixner
2020-05-19 23:57 ` Andy Lutomirski
2020-05-20 15:08 ` Thomas Gleixner
2020-05-15 23:46 ` Thomas Gleixner [this message]
2020-05-20 0:32 ` [patch V6 31/37] x86/entry: Remove the apic/BUILD interrupt leftovers Andy Lutomirski
2020-05-15 23:46 ` [patch V6 32/37] x86/entry/64: Remove IRQ stack switching ASM Thomas Gleixner
2020-05-20 0:33 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 33/37] x86/entry: Make enter_from_user_mode() static Thomas Gleixner
2020-05-20 0:34 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 34/37] x86/entry/32: Remove redundant irq disable code Thomas Gleixner
2020-05-20 0:35 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 35/37] x86/entry/64: Remove TRACE_IRQS_*_DEBUG Thomas Gleixner
2020-05-20 0:46 ` Andy Lutomirski
2020-05-15 23:46 ` [patch V6 36/37] x86/entry: Move paranoid irq tracing out of ASM code Thomas Gleixner
2020-05-20 0:53 ` Andy Lutomirski
2020-05-20 15:16 ` Thomas Gleixner
2020-05-20 17:13 ` Andy Lutomirski
2020-05-20 18:33 ` Thomas Gleixner
2020-05-15 23:46 ` [patch V6 37/37] x86/entry: Remove the TRACE_IRQS cruft Thomas Gleixner
2020-05-18 23:07 ` Andy Lutomirski
2020-05-16 17:18 ` [patch V6 00/37] x86/entry: Rework leftovers and merge plan Paul E. McKenney
2020-05-19 12:28 ` Joel Fernandes
2020-05-18 16:07 ` Peter Zijlstra
2020-05-18 18:53 ` Thomas Gleixner
2020-05-19 8:29 ` Peter Zijlstra
2020-05-18 20:24 ` Thomas Gleixner
2020-05-19 8:38 ` Peter Zijlstra
2020-05-19 9:02 ` Peter Zijlstra
2020-05-23 2:52 ` Lai Jiangshan
2020-05-23 13:08 ` Peter Zijlstra
2020-06-15 16:17 ` Peter Zijlstra
2020-05-19 9:06 ` Thomas Gleixner
2020-05-19 18:37 ` Steven Rostedt
2020-05-19 19:09 ` Thomas Gleixner
2020-05-19 19:13 ` Steven Rostedt
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