Optimize Your Storage Stack NVMe I/O Passthrough for Maximum Efficiency

VMDirectPath I/O (PCI passthrough) enables direct assignment of hardware PCI functions such as NVMe solid-state drives to a virtual machine. I wrote and tested the one below to override nsid on block devices, but doesn't require a visible namespace through the management device. ... is marked hidden we ... ("NVMe") to this field initiates an NVM Subsystem Reset. A write of any ... The Format NVM command may fail if there are outstanding IO commands to the namespace. v6: - Reabse, etest nvme-6.5 and add test log for admin and I/O passthru error log. v5: - Trim down code in the nvme_log_error_passthrough ... So let's send our new NVMe admin command (You can use the -s option to show the NVMe SQE in the terminal). 1. sudo nvme admin-passthru /dev/ ... nvme-id-ctrl - Send NVMe Identify Controller, return result and structure ... nvme-io-passthru (1) - Submit an arbitrary io command, return results; nvme ... Nvme-cli uses NVME_IOCTL_IO_CMDs for "io-passthru" commands to cuse devices. This patch adds support for that IOCTL. Signed-off-by: Curt Bruns ... In this paper, we present our experience building and upstreaming I/O Passthru and report on how this helps to consume new NVMe innovations ... Used for the data-direction for the command and required for commands sending/receiving data. Don't use both read and write at the same time. IO Uring: [RFC 00/13] uring-passthru for nvme.