Kumar, Venkat wrote:
2. If it is Guest physical address, how qemu converts it to its virtual address before processing the buffer?
See the logic in cpu_physical_memory_rw() and cpu_physical_memory_map().
==> Thanks for the reply. Are these the functions which convert the Guest physical addresses to qemu Virtual addresses?
Yes.
If yes, I did not find any routine calling these functions in the Virtio block IO flow. May be I missed it. Can you please point me to the code where Qemu's backend virtio driver is taking the SGE from the virt ring descriptor after it gets a notification from the guest and converting it to a qemu virtual address before calling "read or write" system calls.
It's in hw/virtio.c, see virtqueue_pop().
virtio-blk.c will issue the actual read or write (via
bdrv_aio_{read,write}v()).
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error compiling committee.c: too many arguments to function
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