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authorThomas Gleixner <tglx@linutronix.de>2020-05-21 22:05:38 +0200
committerThomas Gleixner <tglx@linutronix.de>2020-06-11 15:15:13 +0200
commit6368558c37107bed35950cfbd994f49de07236dc (patch)
treec4fd9ead8807eea01be4b3a4120b98cca21c6aa1 /arch
parentfa5e5c409213265da8a188b4a5e4e641b1382eb4 (diff)
x86/entry: Provide IDTENTRY_SYSVEC
Provide IDTENTRY variants for system vectors to consolidate the different mechanisms to emit the ASM stubs for 32- and 64-bit. On 64-bit this also moves the stack switching from ASM to C code. 32-bit will excute the system vectors w/o stack switching as before. The simple variant is meant for "empty" system vectors like scheduler IPI and KVM posted interrupt vectors. These do not need the full glory of irq enter/exit handling with softirq processing and more. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Acked-by: Andy Lutomirski <luto@kernel.org> Link: https://lore.kernel.org/r/20200521202119.185317067@linutronix.de
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/entry/entry_32.S4
-rw-r--r--arch/x86/entry/entry_64.S8
-rw-r--r--arch/x86/include/asm/idtentry.h79
3 files changed, 91 insertions, 0 deletions
diff --git a/arch/x86/entry/entry_32.S b/arch/x86/entry/entry_32.S
index b47b7b223811..a8803aa3a07b 100644
--- a/arch/x86/entry/entry_32.S
+++ b/arch/x86/entry/entry_32.S
@@ -765,6 +765,10 @@ SYM_CODE_START_LOCAL(asm_\cfunc)
SYM_CODE_END(asm_\cfunc)
.endm
+.macro idtentry_sysvec vector cfunc
+ idtentry \vector asm_\cfunc \cfunc has_error_code=0
+.endm
+
/*
* Include the defines which emit the idt entries which are shared
* shared between 32 and 64 bit.
diff --git a/arch/x86/entry/entry_64.S b/arch/x86/entry/entry_64.S
index e54bcd3244f8..9b7183dac202 100644
--- a/arch/x86/entry/entry_64.S
+++ b/arch/x86/entry/entry_64.S
@@ -542,6 +542,14 @@ SYM_CODE_END(\asmsym)
.endm
/*
+ * System vectors which invoke their handlers directly and are not
+ * going through the regular common device interrupt handling code.
+ */
+.macro idtentry_sysvec vector cfunc
+ idtentry \vector asm_\cfunc \cfunc has_error_code=0
+.endm
+
+/*
* MCE and DB exceptions
*/
#define CPU_TSS_IST(x) PER_CPU_VAR(cpu_tss_rw) + (TSS_ist + (x) * 8)
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h
index 341888184d1c..63f7b99703cf 100644
--- a/arch/x86/include/asm/idtentry.h
+++ b/arch/x86/include/asm/idtentry.h
@@ -6,6 +6,9 @@
#include <asm/trapnr.h>
#ifndef __ASSEMBLY__
+#include <linux/hardirq.h>
+
+#include <asm/irq_stack.h>
void idtentry_enter_user(struct pt_regs *regs);
void idtentry_exit_user(struct pt_regs *regs);
@@ -211,6 +214,78 @@ __visible noinstr void func(struct pt_regs *regs, \
static __always_inline void __##func(struct pt_regs *regs, u8 vector)
/**
+ * DECLARE_IDTENTRY_SYSVEC - Declare functions for system vector entry points
+ * @vector: Vector number (ignored for C)
+ * @func: Function name of the entry point
+ *
+ * Declares three functions:
+ * - The ASM entry point: asm_##func
+ * - The XEN PV trap entry point: xen_##func (maybe unused)
+ * - The C handler called from the ASM entry point
+ *
+ * Maps to DECLARE_IDTENTRY().
+ */
+#define DECLARE_IDTENTRY_SYSVEC(vector, func) \
+ DECLARE_IDTENTRY(vector, func)
+
+/**
+ * DEFINE_IDTENTRY_SYSVEC - Emit code for system vector IDT entry points
+ * @func: Function name of the entry point
+ *
+ * idtentry_enter/exit() and irq_enter/exit_rcu() are invoked before the
+ * function body. KVM L1D flush request is set.
+ *
+ * Runs the function on the interrupt stack if the entry hit kernel mode
+ */
+#define DEFINE_IDTENTRY_SYSVEC(func) \
+static void __##func(struct pt_regs *regs); \
+ \
+__visible noinstr void func(struct pt_regs *regs) \
+{ \
+ bool rcu_exit = idtentry_enter_cond_rcu(regs); \
+ \
+ instrumentation_begin(); \
+ irq_enter_rcu(); \
+ kvm_set_cpu_l1tf_flush_l1d(); \
+ run_on_irqstack_cond(__##func, regs, regs); \
+ irq_exit_rcu(); \
+ lockdep_hardirq_exit(); \
+ instrumentation_end(); \
+ idtentry_exit_cond_rcu(regs, rcu_exit); \
+} \
+ \
+static noinline void __##func(struct pt_regs *regs)
+
+/**
+ * DEFINE_IDTENTRY_SYSVEC_SIMPLE - Emit code for simple system vector IDT
+ * entry points
+ * @func: Function name of the entry point
+ *
+ * Runs the function on the interrupted stack. No switch to IRQ stack and
+ * only the minimal __irq_enter/exit() handling.
+ *
+ * Only use for 'empty' vectors like reschedule IPI and KVM posted
+ * interrupt vectors.
+ */
+#define DEFINE_IDTENTRY_SYSVEC_SIMPLE(func) \
+static __always_inline void __##func(struct pt_regs *regs); \
+ \
+__visible noinstr void func(struct pt_regs *regs) \
+{ \
+ bool rcu_exit = idtentry_enter_cond_rcu(regs); \
+ \
+ instrumentation_begin(); \
+ __irq_enter_raw(); \
+ kvm_set_cpu_l1tf_flush_l1d(); \
+ __##func (regs); \
+ __irq_exit_raw(); \
+ instrumentation_end(); \
+ idtentry_exit_cond_rcu(regs, rcu_exit); \
+} \
+ \
+static __always_inline void __##func(struct pt_regs *regs)
+
+/**
* DECLARE_IDTENTRY_XENCB - Declare functions for XEN HV callback entry point
* @vector: Vector number (ignored for C)
* @func: Function name of the entry point
@@ -361,6 +436,10 @@ __visible noinstr void func(struct pt_regs *regs, \
#define DECLARE_IDTENTRY_IRQ(vector, func) \
idtentry_irq vector func
+/* System vector entries */
+#define DECLARE_IDTENTRY_SYSVEC(vector, func) \
+ idtentry_sysvec vector func
+
#ifdef CONFIG_X86_64
# define DECLARE_IDTENTRY_MCE(vector, func) \
idtentry_mce_db vector asm_##func func

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