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** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1777232
Title:
NVME fails on big writes
Status in QEMU:
Incomplete
Bug description:
NVME Compliance test 8:3.3.0 tries to write and read back big chunks
of pages. Currently, on the latest QEMU operation of size 1024 blocks
will fail when device is backed by a file.
NVME specification has several types of data transfers from guests,
one of the is the PRP list (Physical Region Page List). PRP is a list
of entries pointing to pages to be written. The list it self resides
in a single or multiple pages.
NVME device maps the PRP list into QEMUSGList which will be me mapped
into linux IO vectors. Finally, when the file driver will write the
changes, it uses the posix pwritev, which fails if the number of
vectors exceeds the maximum.
NVME Compliance - https://github.com/nvmecompliance/tnvme/wiki
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