[Xen-devel] [VTD][PATCH] Do dpci eoi outside of irq_lock

["Han, Weidong" <weidong.han@xxxxxxxxx>]

Deadlock may occur if do hvm_dpci_eoi() inside of irq_lock on MP
platform. For example, there are two physical cpus. If interrupt is
injected on cpu0, but vcpu is migrated to cpu1 and it does eoi inside of
irq_lock, then IPI will be issued to cpu0. At the same time, cpu0 may
have disabled irq and is acquiring the same irq_lock. In addition,
current code cannot guarantee do hvm_dpci_eoi() inside of irq_lock when
timeout. This patch does hvm_dpci_eoi() outside of irq_lock, and solves
above problems.

Signed-off-by: Xiaohui Xin <xiaohui.xin@xxxxxxxxx>
Signed-off-by: Weidong Han <weidong.han@xxxxxxxxx>

Attachment: eoi_lock.patch
Description: eoi_lock.patch

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