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Re: [PATCH 2/3] x86/defconfig: add CONFIG_IRQ_REMAP
- To: Shashank Balaji <shashank.mahadasyam@xxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, "H. Peter Anvin" <hpa@xxxxxxxxx>, Suresh Siddha <suresh.b.siddha@xxxxxxxxx>, "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>, Haiyang Zhang <haiyangz@xxxxxxxxxxxxx>, Wei Liu <wei.liu@xxxxxxxxxx>, Dexuan Cui <decui@xxxxxxxxxxxxx>, Long Li <longli@xxxxxxxxxxxxx>, Ajay Kaher <ajay.kaher@xxxxxxxxxxxx>, Alexey Makhalov <alexey.makhalov@xxxxxxxxxxxx>, Broadcom internal kernel review list <bcm-kernel-feedback-list@xxxxxxxxxxxx>, Jan Kiszka <jan.kiszka@xxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Mon, 2 Feb 2026 11:35:38 +0000
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-hyperv@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxx, jailhouse-dev@xxxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, Rahul Bukte <rahul.bukte@xxxxxxxx>, Daniel Palmer <daniel.palmer@xxxxxxxx>, Tim Bird <tim.bird@xxxxxxxx>
- Delivery-date: Mon, 02 Feb 2026 11:36:13 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 02/02/2026 9:51 am, Shashank Balaji wrote:
> Interrupt remapping is an architectural dependency of x2apic, which is already
> enabled in the defconfig.
There is no such dependency. VMs for example commonly have x2APIC and
no IOMMU, and even native system with fewer than 254 CPUs does not need
interrupt remapping for IO-APIC interrupts to function correctly.
For native systems with 255 or more CPUs you do want Interrupt Remapping
so enabling it in defconfig is a good move, but the justification needs
correcting.
~Andrew
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