s390/fpu: Re-add exception handling in load_fpu_state()

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From: Heiko Carstens <hca@xxxxxxxxxxxxx>

commit 4734406c39238cbeafe66f0060084caa3247ff53 upstream.

With the recent rewrite of the fpu code exception handling for the
lfpc instruction within load_fpu_state() was erroneously removed.

Add it again to prevent that loading invalid floating point register
values cause an unhandled specification exception.

Fixes: 8c09871a950a ("s390/fpu: limit save and restore to used registers")
Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Aristeu Rozanski <aris@xxxxxxxxxx>
Tested-by: Aristeu Rozanski <aris@xxxxxxxxxx>
Reviewed-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx>
Signed-off-by: Vasily Gorbik <gor@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 arch/s390/kernel/fpu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/s390/kernel/fpu.c b/arch/s390/kernel/fpu.c
index fa90bbdc5ef9..6f2e87920288 100644
--- a/arch/s390/kernel/fpu.c
+++ b/arch/s390/kernel/fpu.c
@@ -113,7 +113,7 @@ void load_fpu_state(struct fpu *state, int flags)
 	int mask;
 
 	if (flags & KERNEL_FPC)
-		fpu_lfpc(&state->fpc);
+		fpu_lfpc_safe(&state->fpc);
 	if (!cpu_has_vx()) {
 		if (flags & KERNEL_VXR_V0V7)
 			load_fp_regs_vx(state->vxrs);
-- 
2.46.0



Patches currently in stable-queue which might be from hca@xxxxxxxxxxxxx are

queue-6.10/s390-fpu-re-add-exception-handling-in-load_fpu_state.patch
queue-6.10/s390-mm-ptdump-fix-handling-of-identity-mapping-area.patch




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