Jason Wang
2020-Jul-17 04:01 UTC
[PATCH V2 2/6] kvm: detect assigned device via irqbypass manager
On 2020/7/16 ??7:23, Zhu Lingshan wrote:> vDPA devices has dedicated backed hardware like > passthrough-ed devices. Then it is possible to setup irq > offloading to vCPU for vDPA devices. Thus this patch tries to > manipulated assigned device counters via irqbypass manager.This part needs some tweak, e.g why assigned device could be detected through this way.> > We will increase/decrease the assigned device counter in kvm/x86.And you need explain why we don't need similar thing in other arch. Thanks> Both vDPA and VFIO would go through this code path. > > This code path only affect x86 for now. > > Signed-off-by: Zhu Lingshan <lingshan.zhu at intel.com> > Suggested-by: Jason Wang <jasowang at redhat.com> > --- > arch/x86/kvm/x86.c | 10 ++++++++-- > 1 file changed, 8 insertions(+), 2 deletions(-) > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c > index 00c88c2..20c07d3 100644 > --- a/arch/x86/kvm/x86.c > +++ b/arch/x86/kvm/x86.c > @@ -10624,11 +10624,17 @@ int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons, > { > struct kvm_kernel_irqfd *irqfd > container_of(cons, struct kvm_kernel_irqfd, consumer); > + int ret; > > irqfd->producer = prod; > + kvm_arch_start_assignment(irqfd->kvm); > + ret = kvm_x86_ops.update_pi_irte(irqfd->kvm, > + prod->irq, irqfd->gsi, 1); > + > + if (ret) > + kvm_arch_end_assignment(irqfd->kvm); > > - return kvm_x86_ops.update_pi_irte(irqfd->kvm, > - prod->irq, irqfd->gsi, 1); > + return ret; > } > > void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,