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vfio/ccw: sort out physical vs virtual pointers usage 

The ORB's interrupt parameter field is stored unmodified into the
interruption code when an I/O interrupt occurs. As this reflects
a real device, let's store the physical address of the subchannel
struct so it can be used when processing an interrupt.

Note: this currently doesn't fix a real bug, since virtual
addresses are identical to physical ones.

Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
[EF: Updated commit message]
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>
Link: https://lore.kernel.org/r/20221121165836.283781-2-farman@linux.ibm.com
This commit is contained in:
Alexander Gordeev 2022-11-21 17:58:35 +01:00
parent dfe843dce7
commit 21c7996917
1 changed files with 1 additions and 1 deletions
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2
drivers/s390/cio/vfio_ccw_fsm.c
View File

@ -29,7 +29,7 @@ static int fsm_io_helper(struct vfio_ccw_private *private)
spin_lock_irqsave(sch->lock, flags);
orb = cp_get_orb(&private->cp, (u32)(addr_t)sch, sch->lpm);
orb = cp_get_orb(&private->cp, (u32)virt_to_phys(sch), sch->lpm);
if (!orb) {
ret = -EIO;
goto out;