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Re: [Xen-devel] [PATCH 3/4] docs: add pvscsi.txt



On 03/02/2015 11:16 AM, Olaf Hering wrote:
Signed-off-by: Olaf Hering <olaf@xxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
---
  docs/misc/pvscsi.txt | 147 +++++++++++++++++++++++++++++++++++++++++++++++++++
  1 file changed, 147 insertions(+)

diff --git a/docs/misc/pvscsi.txt b/docs/misc/pvscsi.txt
new file mode 100644
index 0000000..2af050f
--- /dev/null
+++ b/docs/misc/pvscsi.txt
@@ -0,0 +1,147 @@
+. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
+PVSCSI
+
+== Overview ==
+
+PVSCSI allows to assing a "physical" SCSI device from dom0 to a domU. The 
device
+is not limited to be a native SCSI device. Everything visible as SCSI device in
+dom0 can be used. Currently PVSCSI is only available in Linux dom0 and domU.
+
+== TODO ===
+
+How to do live migration?
+ - pdev will likely be evaluated again on the target host if it came from
+   domU.cfg. But what about pdev from 'xl scsi-attach pdev vdev'? Its required
+   to adjust h:c:t:l on the target host.

Use WWN notation? :-)

This was one of the reason the backend should support it.

+
+Implement checks for duplicate pdev assignments?
+ - Not sure if SCSI devices can be shared. Will the state be consistent during
+   concurrent access? Should the host admin assume cooperative access from
+   multiple domUs?

SCSI does support device sharing. That's the reason for the existence of
SCSI commands like "reserve" and "release".


Juergen


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