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| author | Sven Schnelle <svens@linux.ibm.com> | 2020-02-20 12:09:36 +0100 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2020-05-28 12:21:54 +0200 |
| commit | 0b0ed657fe003fdf4df3766b898e8869950aa1ce (patch) | |
| tree | aa4ee98940a9605c6bc5dd580794c9378f66a640 /arch/s390/kvm | |
| parent | s390: add machine check SIGP (diff) | |
| download | linux-0b0ed657fe003fdf4df3766b898e8869950aa1ce.tar.xz linux-0b0ed657fe003fdf4df3766b898e8869950aa1ce.zip | |
s390: remove critical section cleanup from entry.S
The current code is rather complex and caused a lot of subtle
and hard to debug bugs in the past. Simplify the code by calling
the system_call handler with interrupts disabled, save
machine state, and re-enable them later.
This requires significant changes to the machine check handling code
as well. When the machine check interrupt arrived while being in kernel
mode the new code will signal pending machine checks with a SIGP external
call. When userspace was interrupted, the handler will switch to the
kernel stack and directly execute s390_handle_mcck().
Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/kvm')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 3 | ||||
| -rw-r--r-- | arch/s390/kvm/vsie.c | 2 |
2 files changed, 0 insertions, 5 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 19a81024fe16..5722daf0b603 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -3995,9 +3995,6 @@ static int vcpu_pre_run(struct kvm_vcpu *vcpu) if (need_resched()) schedule(); - if (test_cpu_flag(CIF_MCCK_PENDING)) - s390_handle_mcck(); - if (!kvm_is_ucontrol(vcpu->kvm)) { rc = kvm_s390_deliver_pending_interrupts(vcpu); if (rc) diff --git a/arch/s390/kvm/vsie.c b/arch/s390/kvm/vsie.c index 4f6c22d72072..4fde24a1856e 100644 --- a/arch/s390/kvm/vsie.c +++ b/arch/s390/kvm/vsie.c @@ -1002,8 +1002,6 @@ static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) if (need_resched()) schedule(); - if (test_cpu_flag(CIF_MCCK_PENDING)) - s390_handle_mcck(); srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx); |