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From: Jacob Pan <jacob.jun.pan@linux.intel.com>
To: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>,
	LKML <linux-kernel@vger.kernel.org>, X86 Kernel <x86@kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	iommu@lists.linux.dev, Lu Baolu <baolu.lu@linux.intel.com>,
	kvm@vger.kernel.org, Dave Hansen <dave.hansen@intel.com>,
	Joerg Roedel <joro@8bytes.org>, "H. Peter Anvin" <hpa@zytor.com>,
	Borislav Petkov <bp@alien8.de>, Ingo Molnar <mingo@redhat.com>,
	Paul Luse <paul.e.luse@intel.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Jens Axboe <axboe@kernel.dk>, Raj Ashok <ashok.raj@intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	maz@kernel.org, seanjc@google.com,
	Robin Murphy <robin.murphy@arm.com>,
	jim.harris@samsung.com, a.manzanares@samsung.com,
	Bjorn Helgaas <helgaas@kernel.org>,
	guang.zeng@intel.com, robert.hoo.linux@gmail.com,
	kan.liang@intel.com, "Kleen, Andi" <andi.kleen@intel.com>,
	jacob.jun.pan@linux.intel.com
Subject: Re: [PATCH v2 05/13] x86/irq: Reserve a per CPU IDT vector for posted MSIs
Date: Mon, 22 Apr 2024 15:32:50 -0700	[thread overview]
Message-ID: <20240422153250.07331f49@jacob-builder> (raw)
In-Reply-To: <ZiLO9RUdMsNlCtI_@x1>

Hi Arnaldo,

On Fri, 19 Apr 2024 17:07:17 -0300, Arnaldo Carvalho de Melo
<acme@kernel.org> wrote:

> > > On a second thought, if we make system IRQ vector determined at
> > > compile time based on different CONFIG options, will it break
> > > userspace tools such as perf? More importantly the rule of not
> > > breaking userspace.  
> 
> The rule for tools/perf is "don't impose _any requirement_ on the kernel
> developers, they don't have to test if any change they do outside of
> tools/ will break something inside tools/."
>  
> > tools/arch/x86/include/asm/irq_vectors.h is only used to generate the
> > list of system vectors for pretty output. And your change already broke
> > that.  
> 
> Yeah, I even moved that from tools/arch/x86/include/asm/irq_vectors.h
> to tools/perf/trace/beauty/arch/x86/include/asm/irq_vectors.h (for next
> merge window).

So I will not add anything to the tools directory for my next version.
Just a heads-up for adding this new vector.

Thanks,

Jacob

  reply	other threads:[~2024-04-22 22:28 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-05 22:30 [PATCH v2 00/13] Coalesced Interrupt Delivery with posted MSI Jacob Pan
2024-04-05 22:30 ` [PATCH v2 01/13] x86/irq: Move posted interrupt descriptor out of vmx code Jacob Pan
2024-04-17  0:34   ` Sean Christopherson
2024-04-17 18:33     ` Jacob Pan
2024-04-05 22:30 ` [PATCH v2 02/13] x86/irq: Unionize PID.PIR for 64bit access w/o casting Jacob Pan
2024-04-05 22:31 ` [PATCH v2 03/13] x86/irq: Remove bitfields in posted interrupt descriptor Jacob Pan
2024-04-17  0:39   ` Sean Christopherson
2024-04-17 18:01     ` Jacob Pan
2024-04-18 17:30       ` Thomas Gleixner
2024-04-18 18:10         ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 04/13] x86/irq: Add a Kconfig option for posted MSI Jacob Pan
2024-04-05 22:31 ` [PATCH v2 05/13] x86/irq: Reserve a per CPU IDT vector for posted MSIs Jacob Pan
2024-04-11 16:51   ` Thomas Gleixner
2024-04-15 18:53     ` Jacob Pan
2024-04-15 20:43       ` Jacob Pan
2024-04-19  4:00         ` Thomas Gleixner
2024-04-19 14:24           ` Andi Kleen
2024-04-19 16:50             ` Thomas Gleixner
2024-04-19 20:07           ` Arnaldo Carvalho de Melo
2024-04-22 22:32             ` Jacob Pan [this message]
2024-04-12  9:14   ` Tian, Kevin
2024-04-12 14:27     ` Sean Christopherson
2024-04-16  3:45       ` Tian, Kevin
2024-04-05 22:31 ` [PATCH v2 06/13] x86/irq: Set up per host CPU posted interrupt descriptors Jacob Pan
2024-04-12  9:16   ` Tian, Kevin
2024-04-12 17:54     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 07/13] x86/irq: Factor out calling ISR from common_interrupt Jacob Pan
2024-04-12  9:21   ` Tian, Kevin
2024-04-12 16:50     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 08/13] x86/irq: Install posted MSI notification handler Jacob Pan
2024-04-11  7:52   ` Tian, Kevin
2024-04-11 17:38     ` Jacob Pan
2024-04-11 16:54   ` Thomas Gleixner
2024-04-11 18:29     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 09/13] x86/irq: Factor out common code for checking pending interrupts Jacob Pan
2024-04-05 22:31 ` [PATCH v2 10/13] x86/irq: Extend checks for pending vectors to posted interrupts Jacob Pan
2024-04-12  9:25   ` Tian, Kevin
2024-04-12 18:23     ` Jacob Pan
2024-04-16  3:47       ` Tian, Kevin
2024-04-05 22:31 ` [PATCH v2 11/13] iommu/vt-d: Make posted MSI an opt-in cmdline option Jacob Pan
2024-04-06  4:31   ` Robert Hoo
2024-04-08 23:33     ` Jacob Pan
2024-04-13 10:59       ` Robert Hoo
2024-04-12  9:31   ` Tian, Kevin
2024-04-15 23:20     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 12/13] iommu/vt-d: Add an irq_chip for posted MSIs Jacob Pan
2024-04-12  9:36   ` Tian, Kevin
2024-04-16 22:15     ` Jacob Pan
2024-04-05 22:31 ` [PATCH v2 13/13] iommu/vt-d: Enable posted mode for device MSIs Jacob Pan

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