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由 Konrad Rzeszutek Wilk 提交于
Similar to the "xen/pciback: use mutex rather than spinlock in passthrough backend" this patch converts the vpci backend to use a mutex instead of a spinlock. Note that the code taking the lock won't ever get called from non-sleepable context Signed-off-by: NKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
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