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[Xen-devel] [PATCH v2 09/13] x86/PMU: Initialize PMU for PV guests



Code for initializing/deinitializing PMU, including setting up interrupt
handlers.

Signed-off-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
---
 xen/arch/x86/hvm/svm/vpmu.c       |  34 ++++++------
 xen/arch/x86/hvm/vmx/vpmu_core2.c |  51 ++++++++++++------
 xen/arch/x86/hvm/vpmu.c           | 111 +++++++++++++++++++++++++++++++++++++-
 xen/common/event_channel.c        |   1 +
 xen/include/asm-x86/hvm/vpmu.h    |   1 +
 xen/include/public/xen.h          |   1 +
 xen/include/public/xenpmu.h       |   2 +
 xen/include/xen/softirq.h         |   1 +
 8 files changed, 170 insertions(+), 32 deletions(-)

diff --git a/xen/arch/x86/hvm/svm/vpmu.c b/xen/arch/x86/hvm/svm/vpmu.c
index 99d0137..527a1de 100644
--- a/xen/arch/x86/hvm/svm/vpmu.c
+++ b/xen/arch/x86/hvm/svm/vpmu.c
@@ -370,14 +370,19 @@ static int amd_vpmu_initialise(struct vcpu *v)
         }
     }
 
-    ctxt = xzalloc(struct amd_vpmu_context);
-    if ( !ctxt )
+    if ( is_hvm_domain(v->domain) )
     {
-        gdprintk(XENLOG_WARNING, "Insufficient memory for PMU, "
-            " PMU feature is unavailable on domain %d vcpu %d.\n",
-            v->vcpu_id, v->domain->domain_id);
-        return -ENOMEM;
+        ctxt = xzalloc(struct amd_vpmu_context);
+        if ( !ctxt )
+        {
+            gdprintk(XENLOG_WARNING, "Insufficient memory for PMU, "
+                " PMU feature is unavailable on domain %d vcpu %d.\n",
+                v->vcpu_id, v->domain->domain_id);
+                return -ENOMEM;
+        }
     }
+    else
+        ctxt = &v->arch.vpmu.xenpmu_data->pmu.amd;
 
     vpmu->context = ctxt;
     vpmu_set(vpmu, VPMU_CONTEXT_ALLOCATED);
@@ -391,18 +396,17 @@ static void amd_vpmu_destroy(struct vcpu *v)
     if ( !vpmu_is_set(vpmu, VPMU_CONTEXT_ALLOCATED) )
         return;
 
-    if ( is_hvm_domain(v->domain) &&
-         ((struct amd_vpmu_context *)vpmu->context)->msr_bitmap_set )
-        amd_vpmu_unset_msr_bitmap(v);
-
-    xfree(vpmu->context);
-    vpmu_reset(vpmu, VPMU_CONTEXT_ALLOCATED);
-
-    if ( vpmu_is_set(vpmu, VPMU_RUNNING) )
+    if ( is_hvm_domain(v->domain) )
     {
-        vpmu_reset(vpmu, VPMU_RUNNING);
+        if ( ((struct amd_vpmu_context *)vpmu->context)->msr_bitmap_set )
+            amd_vpmu_unset_msr_bitmap(v);
+
+        xfree(vpmu->context);
         release_pmu_ownship(PMU_OWNER_HVM);
     }
+
+    vpmu->context = NULL;
+    vpmu_clear(vpmu);
 }
 
 /* VPMU part of the 'q' keyhandler */
diff --git a/xen/arch/x86/hvm/vmx/vpmu_core2.c 
b/xen/arch/x86/hvm/vmx/vpmu_core2.c
index 7dae451..5726610 100644
--- a/xen/arch/x86/hvm/vmx/vpmu_core2.c
+++ b/xen/arch/x86/hvm/vmx/vpmu_core2.c
@@ -332,21 +332,29 @@ static int core2_vpmu_alloc_resource(struct vcpu *v)
     struct vpmu_struct *vpmu = vcpu_vpmu(v);
     struct core2_vpmu_context *core2_vpmu_cxt;
 
-    if ( !acquire_pmu_ownership(PMU_OWNER_HVM) )
-        return 0;
+    if ( is_hvm_domain(v->domain) )
+    {
+        if ( !acquire_pmu_ownership(PMU_OWNER_HVM) )
+            goto out_err;
 
-    wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
-    if ( vmx_add_host_load_msr(MSR_CORE_PERF_GLOBAL_CTRL) )
-        goto out_err;
+        wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
+        if ( vmx_add_host_load_msr(MSR_CORE_PERF_GLOBAL_CTRL) )
+            goto out_err;
 
-    if ( vmx_add_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL) )
-        goto out_err;
-    vmx_write_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL,
-                 core2_calc_intial_glb_ctrl_msr());
+        if ( vmx_add_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL) )
+            goto out_err;
+        vmx_write_guest_msr(MSR_CORE_PERF_GLOBAL_CTRL,
+                            core2_calc_intial_glb_ctrl_msr());
 
-    core2_vpmu_cxt = xzalloc_bytes(sizeof(struct core2_vpmu_context));
-    if ( !core2_vpmu_cxt )
-        goto out_err;
+        core2_vpmu_cxt = xzalloc_bytes(sizeof(struct core2_vpmu_context));
+        if ( !core2_vpmu_cxt )
+            goto out_err;
+    }
+    else
+    {
+        core2_vpmu_cxt = &v->arch.vpmu.xenpmu_data->pmu.intel;
+        vpmu_set(vpmu, VPMU_CONTEXT_ALLOCATED);
+    }
 
     vpmu->context = (void *)core2_vpmu_cxt;
 
@@ -743,11 +751,18 @@ static int core2_vpmu_initialise(struct vcpu *v, unsigned 
int vpmu_flags)
 func_out:
 
     arch_pmc_cnt = core2_get_arch_pmc_count();
+    if ( arch_pmc_cnt > XENPMU_CORE2_MAX_ARCH_PMCS )
+        arch_pmc_cnt = XENPMU_CORE2_MAX_ARCH_PMCS;
     fixed_pmc_cnt = core2_get_fixed_pmc_count();
     if ( fixed_pmc_cnt > XENPMU_CORE2_MAX_FIXED_PMCS )
         fixed_pmc_cnt = XENPMU_CORE2_MAX_FIXED_PMCS;
     check_pmc_quirk();
 
+    /* PV domains can allocate resources immediately */
+    if ( !is_hvm_domain(v->domain) )
+        if ( !core2_vpmu_alloc_resource(v) )
+            return 1;
+
     return 0;
 }
 
@@ -758,11 +773,15 @@ static void core2_vpmu_destroy(struct vcpu *v)
     if ( !vpmu_is_set(vpmu, VPMU_CONTEXT_ALLOCATED) )
         return;
 
-    xfree(vpmu->context);
-    if ( cpu_has_vmx_msr_bitmap && is_hvm_domain(v->domain) )
-        core2_vpmu_unset_msr_bitmap(v->arch.hvm_vmx.msr_bitmap);
+    if ( is_hvm_domain(v->domain) )
+    {
+        xfree(vpmu->context);
+        if ( cpu_has_vmx_msr_bitmap )
+            core2_vpmu_unset_msr_bitmap(v->arch.hvm_vmx.msr_bitmap);
+    }
+
     release_pmu_ownship(PMU_OWNER_HVM);
-    vpmu_reset(vpmu, VPMU_CONTEXT_ALLOCATED);
+    vpmu_clear(vpmu);
 }
 
 struct arch_vpmu_ops core2_vpmu_ops = {
diff --git a/xen/arch/x86/hvm/vpmu.c b/xen/arch/x86/hvm/vpmu.c
index 256eb13..69aaa7b 100644
--- a/xen/arch/x86/hvm/vpmu.c
+++ b/xen/arch/x86/hvm/vpmu.c
@@ -21,6 +21,9 @@
 #include <xen/config.h>
 #include <xen/sched.h>
 #include <xen/xenoprof.h>
+#include <xen/event.h>
+#include <xen/softirq.h>
+#include <xen/hypercall.h>
 #include <xen/guest_access.h>
 #include <asm/regs.h>
 #include <asm/types.h>
@@ -32,6 +35,7 @@
 #include <asm/hvm/svm/svm.h>
 #include <asm/hvm/svm/vmcb.h>
 #include <asm/apic.h>
+#include <asm/nmi.h>
 #include <public/xenpmu.h>
 
 /*
@@ -249,7 +253,13 @@ void vpmu_destroy(struct vcpu *v)
     struct vpmu_struct *vpmu = vcpu_vpmu(v);
 
     if ( vpmu->arch_vpmu_ops && vpmu->arch_vpmu_ops->arch_vpmu_destroy )
+    {
+        /* Unload VPMU first. This will stop counters from running */
+        on_selected_cpus(cpumask_of(vcpu_vpmu(v)->last_pcpu),
+                         vpmu_save_force, (void *)v, 1);
+
         vpmu->arch_vpmu_ops->arch_vpmu_destroy(v);
+    }
 }
 
 /* Dump some vpmu informations on console. Used in keyhandler dump_domains(). 
*/
@@ -261,6 +271,93 @@ void vpmu_dump(struct vcpu *v)
         vpmu->arch_vpmu_ops->arch_vpmu_dump(v);
 }
 
+int pmu_nmi_interrupt(struct cpu_user_regs *regs, int cpu)
+{
+    return vpmu_do_interrupt(regs);
+}
+
+/* Process the softirq set by PMU NMI handler */
+void pmu_virq(void)
+{
+    struct vcpu *v = current;
+
+    if ( (vpmu_mode & XENPMU_MODE_PRIV) ||
+        (v->domain->domain_id >= DOMID_FIRST_RESERVED) )
+    {
+        if ( smp_processor_id() >= dom0->max_vcpus )
+        {
+            printk(KERN_WARNING "PMU softirq on unexpected processor %d\n",
+                smp_processor_id());
+            return;
+        }
+        v = dom0->vcpu[smp_processor_id()];
+    }
+
+    send_guest_vcpu_virq(v, VIRQ_XENPMU);
+}
+
+static int pvpmu_init(struct domain *d, xenpmu_params_t *params)
+{
+    struct vcpu *v;
+    uint64_t mfn = params->val;
+    static int pvpmu_initted = 0;
+
+    if ( params->vcpu < 0 || params->vcpu >= d->max_vcpus )
+        return -EINVAL;
+
+    if ( !pvpmu_initted )
+    {
+        if (reserve_lapic_nmi() == 0)
+            set_nmi_callback(pmu_nmi_interrupt);
+        else
+        {
+            printk("Failed to reserve PMU NMI\n");
+            return -EBUSY;
+        }
+        open_softirq(PMU_SOFTIRQ, pmu_virq);
+        pvpmu_initted = 1;
+    }
+
+    if ( !mfn_valid(mfn) ||
+        !get_page_and_type(mfn_to_page(mfn), d, PGT_writable_page) )
+        return -EINVAL;
+
+    v = d->vcpu[params->vcpu];
+    v->arch.vpmu.xenpmu_data = map_domain_page_global(mfn);
+    memset(v->arch.vpmu.xenpmu_data, 0, PAGE_SIZE);
+
+    vpmu_initialise(v);
+
+    return 0;
+}
+
+static void pvpmu_finish(struct domain *d, xenpmu_params_t *params)
+{
+    struct vcpu *v;
+    uint64_t mfn;
+
+    if ( params->vcpu < 0 || params->vcpu >= d->max_vcpus )
+        return;
+
+    v = d->vcpu[params->vcpu];
+    if (v != current)
+        vcpu_pause(v);
+
+    if ( v->arch.vpmu.xenpmu_data )
+    {
+        mfn = domain_page_map_to_mfn(v->arch.vpmu.xenpmu_data);
+        if ( mfn_valid(mfn) )
+        {
+            unmap_domain_page_global(v->arch.vpmu.xenpmu_data);
+            put_page_and_type(mfn_to_page(mfn));
+        }
+    }
+    vpmu_destroy(v);
+
+    if (v != current)
+        vcpu_unpause(v);
+}
+
 long do_xenpmu_op(int op, XEN_GUEST_HANDLE_PARAM(void) arg)
 {
     int ret = -EINVAL;
@@ -319,7 +416,19 @@ long do_xenpmu_op(int op, XEN_GUEST_HANDLE_PARAM(void) arg)
             return -EFAULT;
         ret = 0;
         break;
-     }
+
+    case XENPMU_init:
+        if ( copy_from_guest(&pmu_params, arg, 1) )
+            return -EFAULT;
+        ret = pvpmu_init(current->domain, &pmu_params);
+        break;
+
+    case XENPMU_finish:
+        if ( copy_from_guest(&pmu_params, arg, 1) )
+            return -EFAULT;
+        pvpmu_finish(current->domain, &pmu_params);
+        break;
+    }
 
     return ret;
 }
diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index 64c976b..9ee6e5a 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -107,6 +107,7 @@ static int virq_is_global(uint32_t virq)
     case VIRQ_TIMER:
     case VIRQ_DEBUG:
     case VIRQ_XENOPROF:
+    case VIRQ_XENPMU:
         rc = 0;
         break;
     case VIRQ_ARCH_0 ... VIRQ_ARCH_7:
diff --git a/xen/include/asm-x86/hvm/vpmu.h b/xen/include/asm-x86/hvm/vpmu.h
index 87cef41..e046afd 100644
--- a/xen/include/asm-x86/hvm/vpmu.h
+++ b/xen/include/asm-x86/hvm/vpmu.h
@@ -58,6 +58,7 @@ struct vpmu_struct {
     u32 hw_lapic_lvtpc;
     void *context;
     struct arch_vpmu_ops *arch_vpmu_ops;
+    xenpmu_data_t *xenpmu_data;
 };
 
 /* VPMU states */
diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
index 7f56560..91d3db2 100644
--- a/xen/include/public/xen.h
+++ b/xen/include/public/xen.h
@@ -161,6 +161,7 @@ DEFINE_XEN_GUEST_HANDLE(xen_ulong_t);
 #define VIRQ_MEM_EVENT  10 /* G. (DOM0) A memory event has occured           */
 #define VIRQ_XC_RESERVED 11 /* G. Reserved for XenClient                     */
 #define VIRQ_ENOMEM     12 /* G. (DOM0) Low on heap memory       */
+#define VIRQ_XENPMU     13 /* V.  PMC interrupt                              */
 
 /* Architecture-specific VIRQ definitions. */
 #define VIRQ_ARCH_0    16
diff --git a/xen/include/public/xenpmu.h b/xen/include/public/xenpmu.h
index 7f5c65c..ec49097 100644
--- a/xen/include/public/xenpmu.h
+++ b/xen/include/public/xenpmu.h
@@ -25,6 +25,8 @@
 #define XENPMU_mode_set        1
 #define XENPMU_flags_get       2
 #define XENPMU_flags_set       3
+#define XENPMU_init            4
+#define XENPMU_finish          5
 /* ` } */
 
 /* Parameters structure for HYPERVISOR_xenpmu_op call */
diff --git a/xen/include/xen/softirq.h b/xen/include/xen/softirq.h
index 0c0d481..5829fa4 100644
--- a/xen/include/xen/softirq.h
+++ b/xen/include/xen/softirq.h
@@ -8,6 +8,7 @@ enum {
     NEW_TLBFLUSH_CLOCK_PERIOD_SOFTIRQ,
     RCU_SOFTIRQ,
     TASKLET_SOFTIRQ,
+    PMU_SOFTIRQ,
     NR_COMMON_SOFTIRQS
 };
 
-- 
1.8.1.4


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