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>
