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Drivers: hv: vmbus: Base host signaling strictly on the ring state

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One of the factors that can result in the host concluding that a given
guest in mounting a DOS attack is if the guest generates interrupts
to the host when the host is not expecting it. If these "spurious"
interrupts reach a certain rate, the host can throttle the guest to
minimize the impact. The host computation of the "expected number
of interrupts" is strictly based on the ring transitions. Until
the host logic is fixed, base the guest logic to interrupt solely
on the ring state.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan
2016-11-06 13:14:16 -08:00
committed by Greg Kroah-Hartman
parent 0c38cda64a
commit 74198eb4a4
3 changed files with 20 additions and 12 deletions
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7
drivers/hv/ring_buffer.c
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@@ -75,13 +75,6 @@ static bool hv_need_to_signal(u32 old_write, struct hv_ring_buffer_info *rbi,
if (READ_ONCE(rbi->ring_buffer->interrupt_mask))
return false;
/*
* When the client wants to control signaling,
* we only honour the host interrupt mask.
*/
if (policy == HV_SIGNAL_POLICY_EXPLICIT)
return true;
/* check interrupt_mask before read_index */
virt_rmb();
/*