KVM: Switch assigned device IRQ forwarding to threaded handler
This improves the IRQ forwarding for assigned devices: By using the
kernel's threaded IRQ scheme, we can get rid of the latency-prone work
queue and simplify the code in the same run.
Moreover, we no longer have to hold assigned_dev_lock while raising the
guest IRQ, which can be a lenghty operation as we may have to iterate
over all VCPUs. The lock is now only used for synchronizing masking vs.
unmasking of INTx-type IRQs, thus is renames to intx_lock.
Acked-by: Alex Williamson <alex.williamson@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
index 2d63f2c..9fe7fef 100644
--- a/include/linux/kvm_host.h
+++ b/include/linux/kvm_host.h
@@ -470,16 +470,8 @@
void (*irq_acked)(struct kvm_irq_ack_notifier *kian);
};
-#define KVM_ASSIGNED_MSIX_PENDING 0x1
-struct kvm_guest_msix_entry {
- u32 vector;
- u16 entry;
- u16 flags;
-};
-
struct kvm_assigned_dev_kernel {
struct kvm_irq_ack_notifier ack_notifier;
- struct work_struct interrupt_work;
struct list_head list;
int assigned_dev_id;
int host_segnr;
@@ -490,13 +482,13 @@
bool host_irq_disabled;
struct msix_entry *host_msix_entries;
int guest_irq;
- struct kvm_guest_msix_entry *guest_msix_entries;
+ struct msix_entry *guest_msix_entries;
unsigned long irq_requested_type;
int irq_source_id;
int flags;
struct pci_dev *dev;
struct kvm *kvm;
- spinlock_t assigned_dev_lock;
+ spinlock_t intx_lock;
};
struct kvm_irq_mask_notifier {