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Message-ID: <20220221175600.gxbphsnbytgytcpz@liuwe-devbox-debian-v2> Date: Mon, 21 Feb 2022 17:56:00 +0000 From: Wei Liu <wei.liu@...nel.org> To: "Michael Kelley (LINUX)" <mikelley@...rosoft.com> Cc: Boqun Feng <boqun.feng@...il.com>, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Wei Liu <wei.liu@...nel.org>, 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 WilczyĆski <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 On Thu, Feb 17, 2022 at 04:31:06PM +0000, Michael Kelley (LINUX) wrote: > 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> I expect this to go through the PCI tree. Let me know if I should pick this up. Thanks, Wei.
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