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| author | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-17 08:29:41 -0400 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2021-04-17 08:29:41 -0400 |
| commit | 387cb8e89d7fb731337120cce04931f0f06113ea (patch) | |
| tree | 2d4541474bc5aec6edf942578c9d1b9450bb8945 /arch/s390 | |
| parent | 6c377b02a801801b04ec6e5f9a921fca83ff9e54 (diff) | |
| parent | 44bada28219031f9e8e86b84460606efa57b871e (diff) | |
| download | linux-387cb8e89d7fb731337120cce04931f0f06113ea.tar.bz2 | |
Merge tag 'kvm-s390-next-5.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into HEAD
KVM: s390: Fix potential crash in preemptible kernels
There is a potential race for preemptible kernels, where
the host kernel would get a fault when it is preempted as
the wrong point in time.
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index cfe720d16a6a..95ef9193f12e 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -4313,16 +4313,16 @@ static void store_regs_fmt2(struct kvm_vcpu *vcpu) kvm_run->s.regs.bpbc = (vcpu->arch.sie_block->fpf & FPF_BPBC) == FPF_BPBC; kvm_run->s.regs.diag318 = vcpu->arch.diag318_info.val; if (MACHINE_HAS_GS) { + preempt_disable(); __ctl_set_bit(2, 4); if (vcpu->arch.gs_enabled) save_gs_cb(current->thread.gs_cb); - preempt_disable(); current->thread.gs_cb = vcpu->arch.host_gscb; restore_gs_cb(vcpu->arch.host_gscb); - preempt_enable(); if (!vcpu->arch.host_gscb) __ctl_clear_bit(2, 4); vcpu->arch.host_gscb = NULL; + preempt_enable(); } /* SIE will save etoken directly into SDNX and therefore kvm_run */ } |