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| author |   Heiko Carstens <hca@linux.ibm.com> | 2024-02-03 11:45:13 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2024-02-16 14:30:16 +0100 |
| commit | ed3a0a011a9c33d81a0d024882ee433c42bfccae (patch) | |
| tree | 0987d6dba643b39e1152bb77b97c1ece26cef3d7 /arch/s390/kernel/entry.S | |
| parent | s390/fpu: make kernel fpu context preemptible (diff) | |
| download | linux-stable-ed3a0a011a9c33d81a0d024882ee433c42bfccae.tar.xz linux-stable-ed3a0a011a9c33d81a0d024882ee433c42bfccae.zip | |
s390/kvm: convert to regular kernel fpu user
KVM modifies the kernel fpu's regs pointer to its own area to implement its
custom version of preemtible kernel fpu context. With general support for
preemptible kernel fpu context there is no need for the extra complexity in
KVM code anymore.
Therefore convert KVM to a regular kernel fpu user. In particular this
means that all TIF_FPU checks can be removed, since the fpu register
context will never be changed by other kernel fpu users, and also the fpu
register context will be restored if a thread is preempted.
Reviewed-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel/entry.S')
| -rw-r--r-- | arch/s390/kernel/entry.S | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 00f2e1741501..fc5277eab554 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -220,8 +220,6 @@ SYM_FUNC_START(__sie64a) oi __SIE_PROG0C+3(%r14),1 # we are going into SIE now tm __SIE_PROG20+3(%r14),3 # last exit... jnz .Lsie_skip - TSTMSK __SF_SIE_FLAGS(%r15),_TIF_FPU - jo .Lsie_skip # exit if fp/vx regs changed lg %r14,__SF_SIE_CONTROL_PHYS(%r15) # get sie block phys addr BPEXIT __SF_SIE_FLAGS(%r15),_TIF_ISOLATE_BP_GUEST .Lsie_entry: |