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kvm: add capability for any-length ioeventfds

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Cc: Gleb Natapov <[email protected]>
Cc: Paolo Bonzini <[email protected]>
Signed-off-by: Jason Wang <[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>
This commit is contained in:
Jason Wang 2015-09-15 14:41:59 +08:00 • committed by Paolo Bonzini
commit e9ea5069d9
4 changed files with 8 additions and 4 deletions
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6
Documentation/virtual/kvm/api.txt
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@ -1604,7 +1604,7 @@ provided event instead of triggering an exit.
struct kvm_ioeventfd {
__u64 datamatch;
__u64 addr; /* legal pio/mmio address */
__u32 len; /* 1, 2, 4, or 8 bytes */
__u32 len; /* 0, 1, 2, 4, or 8 bytes */
__s32 fd;
__u32 flags;
__u8 pad[36];
@ -1627,6 +1627,10 @@ to the registered address is equal to datamatch in struct kvm_ioeventfd.
For virtio-ccw devices, addr contains the subchannel id and datamatch the
virtqueue index.
With KVM_CAP_IOEVENTFD_ANY_LENGTH, a zero length ioeventfd is allowed, and
the kernel will ignore the length of guest write and may get a faster vmexit.
The speedup may only apply to specific architectures, but the ioeventfd will
work anyway.
4.60 KVM_DIRTY_TLB