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[16.163.40.128]) by smtp.gmail.com with ESMTPSA id mo13-20020a1709030a8d00b001e2b36fd291sm351651plb.171.2024.04.04.19.29.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 Apr 2024 19:29:08 -0700 (PDT) Message-ID: <89927174-6ca9-4299-8157-a0404b30b156@gmail.com> Date: Fri, 5 Apr 2024 10:28:59 +0800 Precedence: bulk X-Mailing-List: iommu@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 04/15] x86/irq: Add a Kconfig option for posted MSI Content-Language: en-US To: Jacob Pan , LKML , X86 Kernel , Peter Zijlstra , iommu@lists.linux.dev, Thomas Gleixner , Lu Baolu , kvm@vger.kernel.org, Dave Hansen , Joerg Roedel , "H. Peter Anvin" , Borislav Petkov , Ingo Molnar Cc: Paul Luse , Dan Williams , Jens Axboe , Raj Ashok , "Tian, Kevin" , maz@kernel.org, seanjc@google.com, Robin Murphy References: <20240126234237.547278-1-jacob.jun.pan@linux.intel.com> <20240126234237.547278-5-jacob.jun.pan@linux.intel.com> From: Robert Hoo In-Reply-To: <20240126234237.547278-5-jacob.jun.pan@linux.intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 1/27/2024 7:42 AM, Jacob Pan wrote: > This option will be used to support delivering MSIs as posted > interrupts. Interrupt remapping is required. > > Signed-off-by: Jacob Pan > --- > arch/x86/Kconfig | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > index 5edec175b9bf..79f04ee2b91c 100644 > --- a/arch/x86/Kconfig > +++ b/arch/x86/Kconfig > @@ -463,6 +463,17 @@ config X86_X2APIC > > If you don't know what to do here, say N. > > +config X86_POSTED_MSI > + bool "Enable MSI and MSI-x delivery by posted interrupts" > + depends on X86_X2APIC && X86_64 && IRQ_REMAP Does posted_msi really depend on x2APIC? PID.NDST encoding supports both xAPIC and x2APIC. If posted_msi posts more stringent requirement, I think it deserves an explanation in this patch's description. And, X86_X2APIC already depends on IRQ_REMAP, can we just list one of them here?