Commit 2edd9cb7 authored by Zhu Lingshan's avatar Zhu Lingshan Committed by Michael S. Tsirkin

kvm: detect assigned device via irqbypass manager

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 by
kvm_arch_start/end_assignment() in irqbypass manager, so that
assigned devices could be detected in update_pi_irte()

We will increase/decrease the assigned device counter in kvm/x86.
Both vDPA and VFIO would go through this code path.

Only X86 uses these counters and kvm_arch_start/end_assignment(),
so this code path only affect x86 for now.
Signed-off-by: default avatarZhu Lingshan <lingshan.zhu@intel.com>
Suggested-by: default avatarJason Wang <jasowang@redhat.com>
Link: https://lore.kernel.org/r/20200731065533.4144-3-lingshan.zhu@intel.comSigned-off-by: default avatarMichael S. Tsirkin <mst@redhat.com>
parent 265a0ad8
...@@ -10630,11 +10630,17 @@ int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons, ...@@ -10630,11 +10630,17 @@ int kvm_arch_irq_bypass_add_producer(struct irq_bypass_consumer *cons,
{ {
struct kvm_kernel_irqfd *irqfd = struct kvm_kernel_irqfd *irqfd =
container_of(cons, struct kvm_kernel_irqfd, consumer); container_of(cons, struct kvm_kernel_irqfd, consumer);
int ret;
irqfd->producer = prod; 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, return ret;
prod->irq, irqfd->gsi, 1);
} }
void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons, void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
...@@ -10657,6 +10663,8 @@ void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons, ...@@ -10657,6 +10663,8 @@ void kvm_arch_irq_bypass_del_producer(struct irq_bypass_consumer *cons,
if (ret) if (ret)
printk(KERN_INFO "irq bypass consumer (token %p) unregistration" printk(KERN_INFO "irq bypass consumer (token %p) unregistration"
" fails: %d\n", irqfd->consumer.token, ret); " fails: %d\n", irqfd->consumer.token, ret);
kvm_arch_end_assignment(irqfd->kvm);
} }
int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq, int kvm_arch_update_irqfd_routing(struct kvm *kvm, unsigned int host_irq,
......
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