On Thu, Jun 16, 2022 at 08:34:06PM +0800, Jinhao Fan wrote: > This patch adds shadow doorbell buffer support in NVMe 1.3 to QEMU > NVMe. The Doorbell Buffer Config admin command is implemented for the > guest to enable shadow doobell buffer. When this feature is enabled, each > SQ/CQ is associated with two buffers, i.e., Shadow Doorbell buffer and > EventIdx buffer. According to the Spec, each queue's doorbell register > is only updated when the Shadow Doorbell buffer value changes from being > less than or equal to the value of the corresponding EventIdx buffer > entry to being greater than that value. Therefore, the number of MMIO's > on the doorbell registers is greatly reduced.
Looks good to me, and passes my sanity tests. Reviewed-by: Keith Busch <kbu...@kernel.org>
