diff options
| author | Liu Ping Fan <kernelfans@gmail.com> | 2013-11-19 14:12:48 +0800 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2013-11-21 14:56:45 +0100 |
| commit | 27025a602cb9d8b0fa5162b465334ef059a503b6 (patch) | |
| tree | e3d750b573ada011b48143f2ae412ddf57bcbbdf /arch/powerpc/kvm/book3s_hv.c | |
| parent | 8a3caa6d74597c2a083f7c87f866891a0b12540b (diff) | |
powerpc: kvm: optimize "sc 1" as fast return
In some scene, e.g openstack CI, PR guest can trigger "sc 1" frequently,
this patch optimizes the path by directly delivering BOOK3S_INTERRUPT_SYSCALL
to HV guest, so powernv can return to HV guest without heavy exit, i.e,
no need to swap TLB, HTAB,.. etc
Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 072287f1c3b..93203bbe571 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -669,12 +669,10 @@ static int kvmppc_handle_exit_hv(struct kvm_run *run, struct kvm_vcpu *vcpu, /* hcall - punt to userspace */ int i; - if (vcpu->arch.shregs.msr & MSR_PR) { - /* sc 1 from userspace - reflect to guest syscall */ - kvmppc_book3s_queue_irqprio(vcpu, BOOK3S_INTERRUPT_SYSCALL); - r = RESUME_GUEST; - break; - } + /* hypercall with MSR_PR has already been handled in rmode, + * and never reaches here. + */ + run->papr_hcall.nr = kvmppc_get_gpr(vcpu, 3); for (i = 0; i < 9; ++i) run->papr_hcall.args[i] = kvmppc_get_gpr(vcpu, 4 + i); |