libxl/blktap integration #1491
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libxl/blktap integration #1491
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We patch blktap to use blktap-control as the misc device name since upstream blktap uses blktap/control. Change our linux patch to use blktap/control and drop our blktap patching to align with upstream. refpolicy needs an additional fixup to label /dev/blktap/control properly. Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
tapback is making a comeback! We'll run it in dom0 to directly provide the tapdisk backends. This reverts commit 7151b14. Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Add patches for libxl compatibility. Pass --libxl flag to tapback for compatibility mode. Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
Add patches for libxl to directly support vbd3 without going through blkback. Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
tapdisk exposes its disks over NBD, and libxl uses that to configure QEMU's access in dom0. We need to re-enabled NBD support for the non-stubdom case to access the disks. Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
QEMU needs to connect to the tapdisk unix socket to access the exported disk images. Allow it. Signed-off-by: Jason Andryuk <jandryuk@gmail.com>
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The Xen 4.14 uprev dropped libxl blktap integration. The data path became:
blkfront <-> blkback <-> /dev/xen/blktap-2/tapdevX <-> tapdisk <-> vhd
This PR introduces upstream-able libxl patches to switch to:
blkfront <-> tapdisk <-> .vhd
Goes with OpenXT/manager#209