linux-kernel - Re: [PATCH 05/15] x86/irq: Reserve a per CPU IDT vector for posted MSIs

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Date: Thu, 4 Apr 2024 21:38:34 +0800
From: Robert Hoo <robert.hoo.linux@...il.com>
To: Jacob Pan <jacob.jun.pan@...ux.intel.com>,
 LKML <linux-kernel@...r.kernel.org>, X86 Kernel <x86@...nel.org>,
 Peter Zijlstra <peterz@...radead.org>, iommu@...ts.linux.dev,
 Thomas Gleixner <tglx@...utronix.de>, Lu Baolu <baolu.lu@...ux.intel.com>,
 kvm@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
 Joerg Roedel <joro@...tes.org>, "H. Peter Anvin" <hpa@...or.com>,
 Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>
Cc: Paul Luse <paul.e.luse@...el.com>, Dan Williams
 <dan.j.williams@...el.com>, Jens Axboe <axboe@...nel.dk>,
 Raj Ashok <ashok.raj@...el.com>, "Tian, Kevin" <kevin.tian@...el.com>,
 maz@...nel.org, seanjc@...gle.com, Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH 05/15] x86/irq: Reserve a per CPU IDT vector for posted
 MSIs

On 1/27/2024 7:42 AM, Jacob Pan wrote:
> When posted MSI is enabled, all device MSIs are multiplexed into a single
> notification vector. MSI handlers will be de-multiplexed at run-time by
> system software without IDT delivery.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@...ux.intel.com>
> ---
>   arch/x86/include/asm/irq_vectors.h | 9 ++++++++-
>   1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/arch/x86/include/asm/irq_vectors.h b/arch/x86/include/asm/irq_vectors.h
> index 3a19904c2db6..08329bef5b1d 100644
> --- a/arch/x86/include/asm/irq_vectors.h
> +++ b/arch/x86/include/asm/irq_vectors.h
> @@ -99,9 +99,16 @@
>   
>   #define LOCAL_TIMER_VECTOR		0xec
>   
> +/*
> + * Posted interrupt notification vector for all device MSIs delivered to
> + * the host kernel.
> + */
> +#define POSTED_MSI_NOTIFICATION_VECTOR	0xeb
>   #define NR_VECTORS			 256
>   
> -#ifdef CONFIG_X86_LOCAL_APIC
> +#ifdef X86_POSTED_MSI

X86_POSTED_MSI --> CONFIG_X86_POSTED_MSI?

> +#define FIRST_SYSTEM_VECTOR		POSTED_MSI_NOTIFICATION_VECTOR
> +#elif defined(CONFIG_X86_LOCAL_APIC)
>   #define FIRST_SYSTEM_VECTOR		LOCAL_TIMER_VECTOR
>   #else
>   #define FIRST_SYSTEM_VECTOR		NR_VECTORS