Stanislav Kinsburskii 0289a67cd7
mshv: Fix level-triggered check on uninitialized data ...
In mshv_irqfd_assign(), the level-triggered validation for resample
irqfds checks irqfd_lapic_irq.lapic_control.level_triggered before
mshv_irqfd_update() has populated the field. Since the irqfd struct is
zero-allocated, level_triggered is always 0 at that point, causing the
check to always reject resample irqfds with -EINVAL. This makes
level-triggered interrupt resampling — used to avoid interrupt storms
with assigned devices — completely non-functional.
Move the check after the mshv_irqfd_update() call, which resolves the
IRQ routing entry and populates irqfd_lapic_irq with the actual trigger
mode.
Fixes: 621191d709skinsburskii@linux.microsoft.com >
Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com >
Signed-off-by: Wei Liu <wei.liu@kernel.org >
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