linux-kernel - Re: [patch 09/15] x86/entry: Convert KVM vectors to IDTENTRY

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Date:   Wed, 26 Feb 2020 11:54:50 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Steven Rostedt <rostedt@...dmis.org>,
        Brian Gerst <brgerst@...il.com>,
        Juergen Gross <jgross@...e.com>, Arnd Bergmann <arnd@...db.de>
Subject: Re: [patch 09/15] x86/entry: Convert KVM vectors to IDTENTRY_SYSVEC

On 25/02/20 23:47, Thomas Gleixner wrote:
> Convert KVm specific system vectors to IDTENTRY_SYSVEC
>   - Implement the C entry point with DEFINE_IDTENTRY_SYSVEC
>   - Emit the ASM stub with DECLARE_IDTENTRY_SYSVEC
>   - Remove the ASM idtentries in 64bit
>   - Remove the BUILD_INTERRUPT entries in 32bit
>   - Remove the old prototyoes
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  arch/x86/entry/entry_32.S         |    3 ---
>  arch/x86/entry/entry_64.S         |    7 -------
>  arch/x86/include/asm/entry_arch.h |   19 -------------------
>  arch/x86/include/asm/hw_irq.h     |    5 -----
>  arch/x86/include/asm/idtentry.h   |    6 ++++++
>  arch/x86/include/asm/irq.h        |    3 ---
>  arch/x86/kernel/idt.c             |    6 +++---
>  arch/x86/kernel/irq.c             |    6 +++---
>  8 files changed, 12 insertions(+), 43 deletions(-)
> 
> --- a/arch/x86/entry/entry_32.S
> +++ b/arch/x86/entry/entry_32.S
> @@ -1286,9 +1286,6 @@ 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
> --- a/arch/x86/entry/entry_64.S
> +++ b/arch/x86/entry/entry_64.S
> @@ -994,13 +994,6 @@ apicinterrupt3 \num \sym \do_sym
>  POP_SECTION_IRQENTRY
>  .endm
>  
> -
> -#ifdef CONFIG_HAVE_KVM
> -apicinterrupt3 POSTED_INTR_VECTOR		kvm_posted_intr_ipi		smp_kvm_posted_intr_ipi
> -apicinterrupt3 POSTED_INTR_WAKEUP_VECTOR	kvm_posted_intr_wakeup_ipi	smp_kvm_posted_intr_wakeup_ipi
> -apicinterrupt3 POSTED_INTR_NESTED_VECTOR	kvm_posted_intr_nested_ipi	smp_kvm_posted_intr_nested_ipi
> -#endif
> -
>  /*
>   * Reload gs selector with exception handling
>   * edi:  new selector
> --- a/arch/x86/include/asm/entry_arch.h
> +++ /dev/null
> @@ -1,19 +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)
> - */
> -
> -#ifdef CONFIG_HAVE_KVM
> -BUILD_INTERRUPT(kvm_posted_intr_ipi, POSTED_INTR_VECTOR)
> -BUILD_INTERRUPT(kvm_posted_intr_wakeup_ipi, POSTED_INTR_WAKEUP_VECTOR)
> -BUILD_INTERRUPT(kvm_posted_intr_nested_ipi, POSTED_INTR_NESTED_VECTOR)
> -#endif
> -
> --- a/arch/x86/include/asm/hw_irq.h
> +++ b/arch/x86/include/asm/hw_irq.h
> @@ -28,11 +28,6 @@
>  #include <asm/irq.h>
>  #include <asm/sections.h>
>  
> -/* Interrupt handlers registered during init_IRQ */
> -extern asmlinkage void kvm_posted_intr_ipi(void);
> -extern asmlinkage void kvm_posted_intr_wakeup_ipi(void);
> -extern asmlinkage void kvm_posted_intr_nested_ipi(void);
> -
>  #ifdef	CONFIG_X86_LOCAL_APIC
>  struct irq_data;
>  struct pci_dev;
> --- a/arch/x86/include/asm/idtentry.h
> +++ b/arch/x86/include/asm/idtentry.h
> @@ -517,6 +517,12 @@ DECLARE_IDTENTRY_SYSVEC(THERMAL_APIC_VEC
>  DECLARE_IDTENTRY_SYSVEC(IRQ_WORK_VECTOR,		sysvec_irq_work);
>  #endif
>  
> +#ifdef CONFIG_HAVE_KVM
> +DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_VECTOR,		sysvec_kvm_posted_intr_ipi);
> +DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_WAKEUP_VECTOR,	sysvec_kvm_posted_intr_wakeup_ipi);
> +DECLARE_IDTENTRY_SYSVEC(POSTED_INTR_NESTED_VECTOR,	sysvec_kvm_posted_intr_nested_ipi);
> +#endif
> +
>  #ifdef CONFIG_X86_MCE
>  /* Machine check */
>  DECLARE_IDTENTRY_MCE(X86_TRAP_MC,	exc_machine_check);
> --- a/arch/x86/include/asm/irq.h
> +++ b/arch/x86/include/asm/irq.h
> @@ -26,9 +26,6 @@ extern void fixup_irqs(void);
>  
>  #ifdef CONFIG_HAVE_KVM
>  extern void kvm_set_posted_intr_wakeup_handler(void (*handler)(void));
> -extern __visible void smp_kvm_posted_intr_ipi(struct pt_regs *regs);
> -extern __visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs);
> -extern __visible void smp_kvm_posted_intr_nested_ipi(struct pt_regs *regs);
>  #endif
>  
>  extern void (*x86_platform_ipi_callback)(void);
> --- a/arch/x86/kernel/idt.c
> +++ b/arch/x86/kernel/idt.c
> @@ -132,9 +132,9 @@ static const __initconst struct idt_data
>  	INTG(LOCAL_TIMER_VECTOR,		asm_sysvec_apic_timer_interrupt),
>  	INTG(X86_PLATFORM_IPI_VECTOR,		asm_sysvec_x86_platform_ipi),
>  # ifdef CONFIG_HAVE_KVM
> -	INTG(POSTED_INTR_VECTOR,		kvm_posted_intr_ipi),
> -	INTG(POSTED_INTR_WAKEUP_VECTOR,		kvm_posted_intr_wakeup_ipi),
> -	INTG(POSTED_INTR_NESTED_VECTOR,		kvm_posted_intr_nested_ipi),
> +	INTG(POSTED_INTR_VECTOR,		asm_sysvec_kvm_posted_intr_ipi),
> +	INTG(POSTED_INTR_WAKEUP_VECTOR,		asm_sysvec_kvm_posted_intr_wakeup_ipi),
> +	INTG(POSTED_INTR_NESTED_VECTOR,		asm_sysvec_kvm_posted_intr_nested_ipi),
>  # endif
>  # ifdef CONFIG_IRQ_WORK
>  	INTG(IRQ_WORK_VECTOR,			asm_sysvec_irq_work),
> --- a/arch/x86/kernel/irq.c
> +++ b/arch/x86/kernel/irq.c
> @@ -301,7 +301,7 @@ EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wa
>  /*
>   * Handler for POSTED_INTERRUPT_VECTOR.
>   */
> -__visible void smp_kvm_posted_intr_ipi(struct pt_regs *regs)
> +DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_posted_intr_ipi)
>  {
>  	struct pt_regs *old_regs = set_irq_regs(regs);
>  
> @@ -314,7 +314,7 @@ EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wa
>  /*
>   * Handler for POSTED_INTERRUPT_WAKEUP_VECTOR.
>   */
> -__visible void smp_kvm_posted_intr_wakeup_ipi(struct pt_regs *regs)
> +DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_posted_intr_wakeup_ipi)
>  {
>  	struct pt_regs *old_regs = set_irq_regs(regs);
>  
> @@ -328,7 +328,7 @@ EXPORT_SYMBOL_GPL(kvm_set_posted_intr_wa
>  /*
>   * Handler for POSTED_INTERRUPT_NESTED_VECTOR.
>   */
> -__visible void smp_kvm_posted_intr_nested_ipi(struct pt_regs *regs)
> +DEFINE_IDTENTRY_SYSVEC(sysvec_kvm_posted_intr_nested_ipi)
>  {
>  	struct pt_regs *old_regs = set_irq_regs(regs);
>  
> 

Acked-by: Paolo Bonzini <pbonzini@...hat.com>