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| author | Jan Kiszka <jan.kiszka@siemens.com> | 2010-11-16 22:30:03 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2011-01-12 11:29:20 +0200 |
| commit | 0645211c43df0b96c51e12980066b3227e10b164 (patch) | |
| tree | 2c23ea65e07b9481681eb6bb7cc5d7d2fa109917 /include/linux | |
| parent | 0c106b5aaa727c7f508828e94cff4a98874f930c (diff) | |
| download | lwn-0645211c43df0b96c51e12980066b3227e10b164.tar.gz lwn-0645211c43df0b96c51e12980066b3227e10b164.zip | |
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>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/kvm_host.h | 12 |
1 files changed, 2 insertions, 10 deletions
diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 2d63f2c0137c..9fe7fefe76b1 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -470,16 +470,8 @@ struct kvm_irq_ack_notifier { 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 @@ struct kvm_assigned_dev_kernel { 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 { |