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From:   Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
To:     Boqun Feng <boqun.feng@gmail.com>, Wei Liu <wei.liu@kernel.org>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Sunil Muthuswamy <sunilmut@linux.microsoft.com>,
        =?UTF-8?q?Krzysztof=20Wilczy=C5=84ski?= <kw@linux.com>,
        linux-kernel@vger.kernel.org, Rob Herring <robh@kernel.org>,
        Dexuan Cui <decui@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        linux-hyperv@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
        linux-pci@vger.kernel.org, "K. Y. Srinivasan" <kys@microsoft.com>
Subject: Re: [RFC PATCH v2] PCI: hv: Avoid the retarget interrupt hypercall in irq_unmask() on ARM64
Date:   Wed,  2 Mar 2022 10:16:25 +0000
Message-Id: <164621616889.27346.10460850825594773169.b4-ty@arm.com>
In-Reply-To: <20220217034525.1687678-1-boqun.feng@gmail.com>
References: <20220217034525.1687678-1-boqun.feng@gmail.com>
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On Thu, 17 Feb 2022 11:45:19 +0800, Boqun Feng wrote:
> On ARM64 Hyper-V guests, SPIs are used for the interrupts of virtual PCI
> devices, and SPIs can be managed directly via GICD registers. Therefore
> the retarget interrupt hypercall is not needed on ARM64.
> 
> An arch-specific interface hv_arch_irq_unmask() is introduced to handle
> the architecture level differences on this. For x86, the behavior
> remains unchanged, while for ARM64 no hypercall is invoked when
> unmasking an irq for virtual PCI devices.
> 
> [...]

Applied to pci/hv, thanks!

[1/1] PCI: hv: Avoid the retarget interrupt hypercall in irq_unmask() on ARM64
      https://git.kernel.org/lpieralisi/pci/c/d06957d7a6

Thanks,
Lorenzo