Re: [RFC PATCH v2] PCI: hv: Avoid the retarget interrupt hypercall in irq_unmask() on ARM64

[Wei Liu]

On Thu, Feb 17, 2022 at 04:31:06PM +0000, Michael Kelley (LINUX) wrote:
> From: Boqun Feng <boqun.feng@xxxxxxxxx> 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@xxxxxxxxx>
> > ---
> > 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@xxxxxxxxxxxxx>

I expect this to go through the PCI tree. Let me know if I should pick
this up.

Thanks,
Wei.