linux-kernel - Re: [RESEND PATCH 1/6] x86/traps: let common_interrupt() handle IRQ_MOVE_CLEANUP

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Message-ID: <Y21J/CehGK7a4Lva@araj-dh-work>
Date:   Thu, 10 Nov 2022 18:59:08 +0000
From:   Ashok Raj <ashok_raj@...ux.intel.com>
To:     Xin Li <xin3.li@...el.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org, kvm@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, seanjc@...gle.com,
        pbonzini@...hat.com, kevin.tian@...el.com,
        Ashok Raj <ashok.raj@...el.com>
Subject: Re: [RESEND PATCH 1/6] x86/traps: let common_interrupt() handle
 IRQ_MOVE_CLEANUP_VECTOR

On Wed, Nov 09, 2022 at 10:15:40PM -0800, Xin Li wrote:
> From: "H. Peter Anvin (Intel)" <hpa@...or.com>
> 
> IRQ_MOVE_CLEANUP_VECTOR is the only one of the system IRQ vectors that
> is *below* FIRST_SYSTEM_VECTOR. It is a slow path, so just push it
> into common_interrupt() just before the spurios interrupt handling.

nit: 
s/spurios/spurious


> 
> Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
> Signed-off-by: Xin Li <xin3.li@...el.com>
> ---
>  arch/x86/kernel/irq.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/arch/x86/kernel/irq.c b/arch/x86/kernel/irq.c
> index 766ffe3ba313..7e125fff45ab 100644
> --- a/arch/x86/kernel/irq.c
> +++ b/arch/x86/kernel/irq.c
> @@ -248,6 +248,10 @@ DEFINE_IDTENTRY_IRQ(common_interrupt)
>  	desc = __this_cpu_read(vector_irq[vector]);
>  	if (likely(!IS_ERR_OR_NULL(desc))) {
>  		handle_irq(desc, regs);
> +#ifdef CONFIG_SMP
> +	} else if (vector == IRQ_MOVE_CLEANUP_VECTOR) {
> +		sysvec_irq_move_cleanup(regs);
> +#endif
>  	} else {
>  		ack_APIC_irq();
>  
> -- 
> 2.34.1
>