On Fri, 16 Feb 2018 23:05:33 +0000
Michael Kelley <mhkelley@xxxxxxxxxxx> wrote:
> Fix bugs in signaling the Hyper-V host when freeing space in the
> host->guest ring buffer:
>
> 1. The interrupt_mask must not be used to determine whether to signal
> on the host->guest ring buffer
> 2. The ring buffer write_index must be read (via hv_get_bytes_to_write)
> *after* pending_send_sz is read in order to avoid a race condition
> 3. Comparisons with pending_send_sz must treat the "equals" case as
> not-enough-space
> 4. Don't signal if the pending_send_sz feature is not present. Older
> versions of Hyper-V that don't implement this feature will poll.
>
> Fixes: 03bad714a161 ("vmbus: more host signalling avoidance")
> Signed-off-by: Michael Kelley <mhkelley@xxxxxxxxxxx>
Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
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