linux-kernel - Re: [PATCH v2] iommu/hyper-v: Allow hyperv irq remapping without x2apic

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Message-ID: <Y3eYAFDKhwsOyeY7@liuwe-devbox-debian-v2>
Date:   Fri, 18 Nov 2022 14:34:40 +0000
From:   Wei Liu <wei.liu@...nel.org>
To:     Nuno Das Neves <nunodasneves@...ux.microsoft.com>
Cc:     linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        iommu@...ts.linux.dev, mikelley@...rosoft.com,
        sunilmut@...rosoft.com, wei.liu@...nel.org, kys@...rosoft.com,
        Tianyu.Lan@...rosoft.com, haiyangz@...rosoft.com,
        decui@...rosoft.com, dwmw2@...radead.org, joro@...tes.org,
        will@...nel.org
Subject: Re: [PATCH v2] iommu/hyper-v: Allow hyperv irq remapping without
 x2apic

On Thu, Nov 17, 2022 at 12:11:39PM -0800, Nuno Das Neves wrote:
> If x2apic is not available, hyperv-iommu skips remapping
> irqs. This breaks root partition which always needs irqs
> remapped.
> 
> Fix this by allowing irq remapping regardless of x2apic,
> and change hyperv_enable_irq_remapping() to return
> IRQ_REMAP_XAPIC_MODE in case x2apic is missing.
> 
> Tested with root and non-root hyperv partitions.
> 
> Signed-off-by: Nuno Das Neves <nunodasneves@...ux.microsoft.com>

Applied to hyperv-next. Thanks.