linux-kernel - RE: [RFC PATCH v2] PCI: hv: Avoid the retarget interrupt hypercall in irq

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Date:   Thu, 17 Feb 2022 16:31:06 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Boqun Feng <boqun.feng@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Wei Liu <wei.liu@...nel.org>
CC:     Sunil Muthuswamy <sunilmut@...ux.microsoft.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Dexuan Cui <decui@...rosoft.com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [RFC PATCH v2] PCI: hv: Avoid the retarget interrupt hypercall in
 irq_unmask() on ARM64

From: Boqun Feng <boqun.feng@...il.com> Sent: Wednesday, February 16, 2022 7:45 PM
> 
> 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.
> 
> Signed-off-by: Boqun Feng <boqun.feng@...il.com>
> ---
> v1 -> v2:
> 
> *	Introduce arch-specific interface hv_arch_irq_unmask() as
> 	suggested by Bjorn
> 
>  drivers/pci/controller/pci-hyperv.c | 233 +++++++++++++++-------------
>  1 file changed, 122 insertions(+), 111 deletions(-)

Reviewed-by: Michael Kelley <mikelley@...rosoft.com>