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| author | Thomas Gleixner <tglx@linutronix.de> | 2020-05-21 23:05:36 +0300 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2020-06-11 16:15:12 +0300 |
| commit | 0bf7c314ff68622468945a24ea2f7ebc1edf0a6b (patch) | |
| tree | 4e3e262f8d7e2dc1b020c5574a72e0427f95ff70 /arch/x86/include/asm/idtentry.h | |
| parent | 7c2a57364cae0f2e070a27d728f1df6844ffff56 (diff) | |
| download | linux-0bf7c314ff68622468945a24ea2f7ebc1edf0a6b.tar.xz | |
x86/entry: Add IRQENTRY_IRQ macro
Provide a seperate IDTENTRY macro for device interrupts. Similar to
IDTENTRY_ERRORCODE with the addition of invoking irq_enter/exit_rcu() and
providing the errorcode as a 'u8' argument to the C function, which
truncates the sign extended vector number.
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/20200521202118.984573165@linutronix.de
Diffstat (limited to 'arch/x86/include/asm/idtentry.h')
| -rw-r--r-- | arch/x86/include/asm/idtentry.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/arch/x86/include/asm/idtentry.h b/arch/x86/include/asm/idtentry.h index 2fc0dc8af2a4..eaee48bd6a19 100644 --- a/arch/x86/include/asm/idtentry.h +++ b/arch/x86/include/asm/idtentry.h @@ -166,6 +166,51 @@ __visible noinstr void func(struct pt_regs *regs) __visible noinstr void func(struct pt_regs *regs, unsigned long error_code) /** + * DECLARE_IDTENTRY_IRQ - Declare functions for device interrupt IDT entry + * points (common/spurious) + * @vector: Vector number (ignored for C) + * @func: Function name of the entry point + * + * Maps to DECLARE_IDTENTRY_ERRORCODE() + */ +#define DECLARE_IDTENTRY_IRQ(vector, func) \ + DECLARE_IDTENTRY_ERRORCODE(vector, func) + +/** + * DEFINE_IDTENTRY_IRQ - Emit code for device interrupt IDT entry points + * @func: Function name of the entry point + * + * The vector number is pushed by the low level entry stub and handed + * to the function as error_code argument which needs to be truncated + * to an u8 because the push is sign extending. + * + * On 64-bit idtentry_enter/exit() are invoked in the ASM entry code before + * and after switching to the interrupt stack. On 32-bit this happens in C. + * + * irq_enter/exit_rcu() are invoked before the function body and the + * KVM L1D flush request is set. + */ +#define DEFINE_IDTENTRY_IRQ(func) \ +static __always_inline void __##func(struct pt_regs *regs, u8 vector); \ + \ +__visible noinstr void func(struct pt_regs *regs, \ + unsigned long error_code) \ +{ \ + bool rcu_exit = idtentry_enter_cond_rcu(regs); \ + \ + instrumentation_begin(); \ + irq_enter_rcu(); \ + kvm_set_cpu_l1tf_flush_l1d(); \ + __##func (regs, (u8)error_code); \ + irq_exit_rcu(); \ + lockdep_hardirq_exit(); \ + instrumentation_end(); \ + idtentry_exit_cond_rcu(regs, rcu_exit); \ +} \ + \ +static __always_inline void __##func(struct pt_regs *regs, u8 vector) + +/** * DECLARE_IDTENTRY_XENCB - Declare functions for XEN HV callback entry point * @vector: Vector number (ignored for C) * @func: Function name of the entry point @@ -312,6 +357,10 @@ __visible noinstr void func(struct pt_regs *regs, \ #define DECLARE_IDTENTRY_RAW_ERRORCODE(vector, func) \ DECLARE_IDTENTRY_ERRORCODE(vector, func) +/* Entries for common/spurious (device) interrupts */ +#define DECLARE_IDTENTRY_IRQ(vector, func) \ + idtentry_irq vector func + #ifdef CONFIG_X86_64 # define DECLARE_IDTENTRY_MCE(vector, func) \ idtentry_mce_db vector asm_##func func |