On Sun, Jul 12, 2020 at 10:49:21PM +0800, Zhu Lingshan wrote:
> We used to detect assigned device via VFIO manipulated device
> conters. This is less flexible consider VFIO is not the only
> interface for assigned device. vDPA devices has dedicated
> backed hardware as well. So this patch tries to detect
> the assigned device via irqbypass manager.
>
> We will increase/decrease the assigned device counter in kvm/x86.
> 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@xxxxxxxxx>
I think it's best to leave VFIO alone. Add appropriate APIs for VDPA,
worry about converting existing users later.
> ---
> arch/x86/kvm/x86.c | 10 ++++++++--
> virt/kvm/vfio.c | 2 --
> 2 files changed, 8 insertions(+), 4 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,
> diff --git a/virt/kvm/vfio.c b/virt/kvm/vfio.c
> index 8fcbc50..111da52 100644
> --- a/virt/kvm/vfio.c
> +++ b/virt/kvm/vfio.c
> @@ -226,7 +226,6 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
> list_add_tail(&kvg->node, &kv->group_list);
> kvg->vfio_group = vfio_group;
>
> - kvm_arch_start_assignment(dev->kvm);
>
> mutex_unlock(&kv->lock);
>
> @@ -254,7 +253,6 @@ static int kvm_vfio_set_group(struct kvm_device *dev, long attr, u64 arg)
> continue;
>
> list_del(&kvg->node);
> - kvm_arch_end_assignment(dev->kvm);
> #ifdef CONFIG_SPAPR_TCE_IOMMU
> kvm_spapr_tce_release_vfio_group(dev->kvm,
> kvg->vfio_group);
> --
> 1.8.3.1
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