linux-kernel - Re: [PATCH v2 08/13] x86/irq: Install posted MSI notification handler

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Date: Thu, 11 Apr 2024 11:29:32 -0700
From: Jacob Pan <jacob.jun.pan@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>
Cc: LKML <linux-kernel@...r.kernel.org>, X86 Kernel <x86@...nel.org>, Peter
 Zijlstra <peterz@...radead.org>, iommu@...ts.linux.dev, 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>, 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>,
 jim.harris@...sung.com, a.manzanares@...sung.com, Bjorn Helgaas
 <helgaas@...nel.org>, guang.zeng@...el.com, robert.hoo.linux@...il.com,
 jacob.jun.pan@...ux.intel.com, xin3.li@...el.com
Subject: Re: [PATCH v2 08/13] x86/irq: Install posted MSI notification
 handler

Hi Thomas,

On Thu, 11 Apr 2024 18:54:29 +0200, Thomas Gleixner <tglx@...utronix.de>
wrote:

> On Fri, Apr 05 2024 at 15:31, Jacob Pan wrote:
> >  
> >  #ifdef CONFIG_SMP
> > diff --git a/arch/x86/kernel/idt.c b/arch/x86/kernel/idt.c
> > index fc37c8d83daf..f445bec516a0 100644
> > --- a/arch/x86/kernel/idt.c
> > +++ b/arch/x86/kernel/idt.c
> > @@ -163,6 +163,9 @@ static const __initconst struct idt_data
> > apic_idts[] = { # endif
> >  	INTG(SPURIOUS_APIC_VECTOR,
> > asm_sysvec_spurious_apic_interrupt), INTG(ERROR_APIC_VECTOR,
> > 		asm_sysvec_error_interrupt), +# ifdef
> > CONFIG_X86_POSTED_MSI
> > +	INTG(POSTED_MSI_NOTIFICATION_VECTOR,
> > asm_sysvec_posted_msi_notification), +# endif
> >  #endif
> >  };  
> 
> Obviously lacks FRED support...
Good point, forgot FRED is merged :)

Will add an entry to entry_fred.c. I would not be able to test performance
though.

Thanks,

Jacob