From: Tianyu Lan <ltykernel@gmail.com>
To: Nuno Das Neves <nunodasneves@linux.microsoft.com>,
linux-hyperv@vger.kernel.org, linux-kernel@vger.kernel.org,
iommu@lists.linux.dev
Cc: mikelley@microsoft.com, sunilmut@microsoft.com,
wei.liu@kernel.org, kys@microsoft.com, Tianyu.Lan@microsoft.com,
haiyangz@microsoft.com, decui@microsoft.com, dwmw2@infradead.org,
joro@8bytes.org, will@kernel.org
Subject: Re: [PATCH v2] iommu/hyper-v: Allow hyperv irq remapping without x2apic
Date: Fri, 18 Nov 2022 11:01:53 +0800 [thread overview]
Message-ID: <354a1247-056c-076f-850c-cda78f00c628@gmail.com> (raw)
In-Reply-To: <1668715899-8971-1-git-send-email-nunodasneves@linux.microsoft.com>
On 11/18/2022 4:11 AM, 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@linux.microsoft.com>
> ---
> arch/x86/kernel/cpu/mshyperv.c | 6 ++++++
> drivers/iommu/Kconfig | 6 +++---
> drivers/iommu/hyperv-iommu.c | 11 ++++++++---
> 3 files changed, 17 insertions(+), 6 deletions(-)
Reviewed-by: Tianyu Lan <Tianyu.Lan@microsoft.com>
next prev parent reply other threads:[~2022-11-18 3:02 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-17 20:11 [PATCH v2] iommu/hyper-v: Allow hyperv irq remapping without x2apic Nuno Das Neves
2022-11-18 2:41 ` Michael Kelley (LINUX)
2022-11-18 3:01 ` Tianyu Lan [this message]
2022-11-18 14:34 ` Wei Liu
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