diff options
| 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/kvm/interrupt.c | |
| parent | 4eed43de9ba0ae3af6716544408d185a152424cd (diff) | |
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/kvm/interrupt.c')
| -rw-r--r-- | arch/s390/kvm/interrupt.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/arch/s390/kvm/interrupt.c b/arch/s390/kvm/interrupt.c index 9315203c2786..c81708acd1f4 100644 --- a/arch/s390/kvm/interrupt.c +++ b/arch/s390/kvm/interrupt.c @@ -584,7 +584,11 @@ static int __write_machine_check(struct kvm_vcpu *vcpu, mci.val = mchk->mcic; /* take care of lazy register loading */ - save_user_fpu_regs(); + fpu_stfpc(&vcpu->run->s.regs.fpc); + if (cpu_has_vx()) + save_vx_regs((__vector128 *)&vcpu->run->s.regs.vrs); + else + save_fp_regs((freg_t *)&vcpu->run->s.regs.fprs); save_access_regs(vcpu->run->s.regs.acrs); if (MACHINE_HAS_GS && vcpu->arch.gs_enabled) save_gs_cb(current->thread.gs_cb); @@ -648,7 +652,7 @@ static int __write_machine_check(struct kvm_vcpu *vcpu, } rc |= write_guest_lc(vcpu, __LC_GPREGS_SAVE_AREA, vcpu->run->s.regs.gprs, 128); - rc |= put_guest_lc(vcpu, current->thread.ufpu.fpc, + rc |= put_guest_lc(vcpu, vcpu->run->s.regs.fpc, (u32 __user *) __LC_FP_CREG_SAVE_AREA); rc |= put_guest_lc(vcpu, vcpu->arch.sie_block->todpr, (u32 __user *) __LC_TOD_PROGREG_SAVE_AREA); |