diff options
| author | Suresh E. Warrier <warrier@linux.vnet.ibm.com> | 2015-03-20 12:39:45 +0300 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2015-04-21 16:21:30 +0300 |
| commit | 878610fe9884a34a282cd4431237343864324d23 (patch) | |
| tree | e87987f0da6ea462d6a790cebe3673fba8a6d8ff /arch/powerpc/kvm/book3s_xics.c | |
| parent | a4bd6eb07ca72d21a7a34499ad34cfef6f527d4e (diff) | |
| download | linux-878610fe9884a34a282cd4431237343864324d23.tar.xz | |
KVM: PPC: Book3S HV: Add guest->host real mode completion counters
Add counters to track number of times we switch from guest real mode
to host virtual mode during an interrupt-related hyper call because the
hypercall requires actions that cannot be completed in real mode. This
will help when making optimizations that reduce guest-host transitions.
It is safe to use an ordinary increment rather than an atomic operation
because there is one ICP per virtual CPU and kvmppc_xics_rm_complete()
only works on the ICP for the current VCPU.
The counters are displayed as part of IPC and ICP state provided by
/sys/debug/kernel/powerpc/kvm* for each VM.
Signed-off-by: Suresh Warrier <warrier@linux.vnet.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc/kvm/book3s_xics.c')
| -rw-r--r-- | arch/powerpc/kvm/book3s_xics.c | 31 |
1 files changed, 27 insertions, 4 deletions
diff --git a/arch/powerpc/kvm/book3s_xics.c b/arch/powerpc/kvm/book3s_xics.c index a4a8d9f0dcb7..60bdbac8beba 100644 --- a/arch/powerpc/kvm/book3s_xics.c +++ b/arch/powerpc/kvm/book3s_xics.c @@ -802,14 +802,22 @@ static noinline int kvmppc_xics_rm_complete(struct kvm_vcpu *vcpu, u32 hcall) XICS_DBG("XICS_RM: H_%x completing, act: %x state: %lx tgt: %p\n", hcall, icp->rm_action, icp->rm_dbgstate.raw, icp->rm_dbgtgt); - if (icp->rm_action & XICS_RM_KICK_VCPU) + if (icp->rm_action & XICS_RM_KICK_VCPU) { + icp->n_rm_kick_vcpu++; kvmppc_fast_vcpu_kick(icp->rm_kick_target); - if (icp->rm_action & XICS_RM_CHECK_RESEND) + } + if (icp->rm_action & XICS_RM_CHECK_RESEND) { + icp->n_rm_check_resend++; icp_check_resend(xics, icp->rm_resend_icp); - if (icp->rm_action & XICS_RM_REJECT) + } + if (icp->rm_action & XICS_RM_REJECT) { + icp->n_rm_reject++; icp_deliver_irq(xics, icp, icp->rm_reject); - if (icp->rm_action & XICS_RM_NOTIFY_EOI) + } + if (icp->rm_action & XICS_RM_NOTIFY_EOI) { + icp->n_rm_notify_eoi++; kvm_notify_acked_irq(vcpu->kvm, 0, icp->rm_eoied_irq); + } icp->rm_action = 0; @@ -872,10 +880,17 @@ static int xics_debug_show(struct seq_file *m, void *private) struct kvm *kvm = xics->kvm; struct kvm_vcpu *vcpu; int icsid, i; + unsigned long t_rm_kick_vcpu, t_rm_check_resend; + unsigned long t_rm_reject, t_rm_notify_eoi; if (!kvm) return 0; + t_rm_kick_vcpu = 0; + t_rm_notify_eoi = 0; + t_rm_check_resend = 0; + t_rm_reject = 0; + seq_printf(m, "=========\nICP state\n=========\n"); kvm_for_each_vcpu(i, vcpu, kvm) { @@ -890,8 +905,16 @@ static int xics_debug_show(struct seq_file *m, void *private) icp->server_num, state.xisr, state.pending_pri, state.cppr, state.mfrr, state.out_ee, state.need_resend); + t_rm_kick_vcpu += icp->n_rm_kick_vcpu; + t_rm_notify_eoi += icp->n_rm_notify_eoi; + t_rm_check_resend += icp->n_rm_check_resend; + t_rm_reject += icp->n_rm_reject; } + seq_puts(m, "ICP Guest Real Mode exit totals: "); + seq_printf(m, "\tkick_vcpu=%lu check_resend=%lu reject=%lu notify_eoi=%lu\n", + t_rm_kick_vcpu, t_rm_check_resend, + t_rm_reject, t_rm_notify_eoi); for (icsid = 0; icsid <= KVMPPC_XICS_MAX_ICS_ID; icsid++) { struct kvmppc_ics *ics = xics->ics[icsid]; |