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s390/pv: fix the forcing of the swiotlb

Thomas Huth requested to merge thuth/kernel-cs-9:bz2051581 into main

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2051581

commit 93ebb6828723b8aef114415c4dc3518342f7dcad

Author: Halil Pasic pasic@linux.ibm.com

Date: Sat Jul 24 01:17:46 2021 +0200

s390/pv: fix the forcing of the swiotlb

Since commit 903cd0f315fe ("swiotlb: Use is_swiotlb_force_bounce for
swiotlb data bouncing") if code sets swiotlb_force it needs to do so
before the swiotlb is initialised. Otherwise
io_tlb_default_mem->force_bounce will not get set to true, and devices
that use (the default) swiotlb will not bounce despite switolb_force
having the value of SWIOTLB_FORCE.

Let us restore swiotlb functionality for PV by fulfilling this new
requirement.

This change addresses what turned out to be a fragility in
commit 64e1f0c531d1 ("s390/mm: force swiotlb for protected
virtualization"), which ain't exactly broken in its original context,
but could give us some more headache if people backport the broken
change and forget this fix.

Signed-off-by: Halil Pasic <pasic@linux.ibm.com>
Tested-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Fixes: 903cd0f315fe ("swiotlb: Use is_swiotlb_force_bounce for swiotlb data bouncing")
Fixes: 64e1f0c531d1 ("s390/mm: force swiotlb for protected virtualization")
Cc: stable@vger.kernel.org #5.3+
Signed-off-by: Konrad Rzeszutek Wilk <konrad@kernel.org>

Signed-off-by: Thomas Huth thuth@redhat.com

Edited by Thomas Huth

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