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| author |   Christian Borntraeger <borntraeger@de.ibm.com> | 2014-03-06 16:01:38 +0100 |
|---|---|---|
| committer | Christian Borntraeger <borntraeger@de.ibm.com> | 2014-03-17 11:06:51 +0100 |
| commit | 2955c83f72801245afd0fe5c560cc75b82bea9aa (patch) | |
| tree | dfb63b55c26af70604c8f175a8c11af557906ac4 /arch/s390/kvm/kvm-s390.c | |
| parent | KVM: s390: Removing untriggerable BUG_ONs (diff) | |
| download | linux-dev-2955c83f72801245afd0fe5c560cc75b82bea9aa.tar.xz linux-dev-2955c83f72801245afd0fe5c560cc75b82bea9aa.zip | |
KVM: s390: Optimize ucontrol path
Since commit 7c470539c95630c1f2a10f109e96f249730b75eb
(s390/kvm: avoid automatic sie reentry) we will run through the C code
of KVM on host interrupts instead of just reentering the guest. This
will result in additional ucontrol exits (at least HZ per second). Let
handle a 0 intercept in the kernel and dont return to userspace,
even if in ucontrol mode.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
CC: stable@vger.kernel.org
Diffstat (limited to 'arch/s390/kvm/kvm-s390.c')
| -rw-r--r-- | arch/s390/kvm/kvm-s390.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c index 62683576f8e2..7337c577e949 100644 --- a/arch/s390/kvm/kvm-s390.c +++ b/arch/s390/kvm/kvm-s390.c @@ -896,7 +896,8 @@ static int vcpu_post_run(struct kvm_vcpu *vcpu, int exit_reason) if (rc == 0) { if (kvm_is_ucontrol(vcpu->kvm)) - rc = -EOPNOTSUPP; + /* Don't exit for host interrupts. */ + rc = vcpu->arch.sie_block->icptcode ? -EOPNOTSUPP : 0; else rc = kvm_handle_sie_intercept(vcpu); } |