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

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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@vger.kernel.org
Reported-by: Aristeu Rozanski <aris@redhat.com>
Tested-by: Aristeu Rozanski <aris@redhat.com>
Reviewed-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heiko Carstens 2024-07-25 11:31:52 +02:00 committed by Greg Kroah-Hartman
parent c3f1d4f61d
commit 494b141382
1 changed files with 1 additions and 1 deletions
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2
arch/s390/kernel/fpu.c
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@ -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);