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Halil Pasic 27dd91221b s390/pv: fix the forcing of the swiotlb 
commit 93ebb6828723b8aef114415c4dc3518342f7dcad upstream.

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 64e1f0c531 ("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: 64e1f0c531 ("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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-09-18 13:40:36 +02:00
..
appldata s390/appldata: use struct_size() helper 2020-06-29 16:32:34 +02:00
boot s390/boot: fix use of expolines in the DMA code 2021-07-28 14:35:42 +02:00
configs s390: update defconfigs 2020-11-12 12:10:36 +01:00
crypto s390/archrandom: add parameter check for s390_arch_random_generate 2021-05-11 14:47:31 +02:00
hypfs fs_parse: fold fs_parameter_desc/fs_parameter_spec 2020-02-07 14:48:37 -05:00
include s390: make PCI mio support a machine flag 2021-09-18 13:40:22 +02:00
kernel s390: make PCI mio support a machine flag 2021-09-18 13:40:22 +02:00
kvm KVM: s390: index kvm->arch.idle_mask by vcpu_idx 2021-09-15 09:50:47 +02:00
lib s390/test_unwind: fix CALL_ON_STACK tests 2020-12-30 11:53:56 +01:00
mm s390/pv: fix the forcing of the swiotlb 2021-09-18 13:40:36 +02:00
net bpf: Introduce BPF nospec instruction for mitigating Spectre v4 2021-08-04 12:46:44 +02:00
oprofile s390/unwind: introduce stack unwind API 2019-05-02 13:54:11 +02:00
pci s390: make PCI mio support a machine flag 2021-09-18 13:40:22 +02:00
purgatory s390: disable SSP when needed 2021-07-20 16:05:42 +02:00
tools .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kbuild s390/numa: move code to arch/s390/kernel 2020-08-11 18:16:55 +02:00
Kconfig s390: appldata depends on PROC_SYSCTL 2021-07-14 16:56:42 +02:00
Kconfig.debug s390/mm,ptdump: convert to generic page table dumper 2020-09-14 11:38:34 +02:00
Makefile s390: disable SSP when needed 2021-07-20 16:05:42 +02:00