A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

KVM: Introduce direct MSI message injection for in-kernel irqchips

Browse source 
Currently, MSI messages can only be injected to in-kernel irqchips by
defining a corresponding IRQ route for each message. This is not only
unhandy if the MSI messages are generated "on the fly" by user space,
IRQ routes are a limited resource that user space has to manage
carefully.

By providing a direct injection path, we can both avoid using up limited
resources and simplify the necessary steps for user land.

Signed-off-by: Jan Kiszka <[email protected]>
Signed-off-by: Avi Kivity <[email protected]>
This commit is contained in:
Jan Kiszka 2012-03-29 21:14:12 +02:00 • committed by Avi Kivity
commit 07975ad3b3
7 changed files with 66 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

3
virt/kvm/Kconfig
View file

@ -18,3 +18,6 @@ config KVM_MMIO
config KVM_ASYNC_PF
bool
config HAVE_KVM_MSI
bool

14
virt/kvm/irq_comm.c
View file

@ -138,6 +138,20 @@ int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e,
return kvm_irq_delivery_to_apic(kvm, NULL, &irq);
}
int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi)
{
struct kvm_kernel_irq_routing_entry route;
if (!irqchip_in_kernel(kvm) || msi->flags != 0)
return -EINVAL;
route.msi.address_lo = msi->address_lo;
route.msi.address_hi = msi->address_hi;
route.msi.data = msi->data;
return kvm_set_msi(&route, kvm, KVM_USERSPACE_IRQ_SOURCE_ID, 1);
}
/*
* Return value:
* < 0 Interrupt was ignored (masked or not delivered for other reasons)

14
virt/kvm/kvm_main.c
View file

@ -2059,6 +2059,17 @@ static long kvm_vm_ioctl(struct file *filp,
kvm->bsp_vcpu_id = arg;
mutex_unlock(&kvm->lock);
break;
#endif
#ifdef CONFIG_HAVE_KVM_MSI
case KVM_SIGNAL_MSI: {
struct kvm_msi msi;
r = -EFAULT;
if (copy_from_user(&msi, argp, sizeof msi))
goto out;
r = kvm_send_userspace_msi(kvm, &msi);
break;
}
#endif
default:
r = kvm_arch_vm_ioctl(filp, ioctl, arg);
@ -2188,6 +2199,9 @@ static long kvm_dev_ioctl_check_extension_generic(long arg)
case KVM_CAP_SET_BOOT_CPU_ID:
#endif
case KVM_CAP_INTERNAL_ERROR_DATA:
#ifdef CONFIG_HAVE_KVM_MSI
case KVM_CAP_SIGNAL_MSI:
#endif
return 1;
#ifdef CONFIG_HAVE_KVM_IRQCHIP
case KVM_CAP_IRQ_ROUTING: