Gregory Haskins wrote:
iofd is a mechanism to register PIO/MMIO regions to trigger an eventfd
signal when written to. Userspace can register any arbitrary address
with a corresponding eventfd.
Please start a separate patchset for this so I can merge irqfd.
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index dfc4bcc..99b6e45 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -292,6 +292,17 @@ struct kvm_guest_debug {
struct kvm_guest_debug_arch arch;
};
+#define KVM_IOFD_FLAG_DEASSIGN (1 << 0)
+#define KVM_IOFD_FLAG_PIO (1 << 1)
+
+struct kvm_iofd {
+ __u64 addr;
+ __u32 len;
+ __u32 fd;
+ __u32 flags;
+ __u8 pad[12];
+};
+
Please add a data match capability. virtio uses a write with the data
containing the queue ID, and we want a separate event for each queue.
* kvm trace categories
@@ -508,6 +519,7 @@ struct kvm_irqfd {
#define KVM_DEASSIGN_DEV_IRQ _IOW(KVMIO, 0x75, struct kvm_assigned_irq)
#define KVM_ASSIGN_IRQFD _IOW(KVMIO, 0x76, struct kvm_irqfd)
#define KVM_DEASSIGN_IRQFD _IOW(KVMIO, 0x77, __u32)
+#define KVM_IOFD _IOW(KVMIO, 0x78, struct kvm_iofd)
Too general a name. It's not doing IO, just sending out notifications.
Why have assign/deassign for irqfd and a single ioctl for iofd?
The rest looks good.
--
error compiling committee.c: too many arguments to function
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