The CCW data address created by vfio-ccw is that of an IDAL
built by this code. Since this address is used by real hardware,
it should be a physical address rather than a virtual one.
Let's clarify it as such in the ORB.
Similarly, once the I/O has completed the memory for that IDAL
needs to be released, so convert the CCW data address back to
a virtual address so that kfree() can process it.
Note: this currently doesn't fix a real bug, since virtual
addresses are identical to physical ones.
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Link: https://lore.kernel.org/r/20221121165836.283781-3-farman@linux.ibm.com
if (ccw_is_tic(ccw))
return;
- kfree((void *)(u64)ccw->cda);
+ kfree(phys_to_virt(ccw->cda));
}
/**
chain = list_first_entry(&cp->ccwchain_list, struct ccwchain, next);
cpa = chain->ch_ccw;
- orb->cmd.cpa = (__u32) __pa(cpa);
+ orb->cmd.cpa = (__u32)virt_to_phys(cpa);
return orb;
}