static int
xenoprof_handler(struct task_struct *task, void *buf, pfm_ovfl_arg_t *arg,
struct pt_regs *regs, unsigned long stamp)
{
unsigned long ip = profile_pc(regs);
int event = arg->pmd_eventid;
struct vcpu *v = current;
int mode = xenoprofile_get_mode(v, regs);
// see pfm_do_interrupt_handler() in xen/arch/ia64/linux-xen/perfmon.c.
// It always passes task as NULL. This is work around
BUG_ON(task != NULL);
arg->ovfl_ctrl.bits.reset_ovfl_pmds = 1;
if (!allow_virq || !allow_ints)
return 0;
// Note that log event actually expect cpu_user_regs, cast back
// appropriately when doing the backtrace implementation in ia64
xenoprof_log_event(v, regs, ip, mode, event);
// send VIRQ_XENOPROF
if (is_active(v->domain) && !xenoprof_is_xen_mode(v, regs) &&
!is_idle_vcpu(v))
send_guest_vcpu_virq(v, VIRQ_XENOPROF);
return 0;
}
static int nmi_callback(const struct cpu_user_regs *regs, int cpu)
{
int xen_mode, ovf;
ovf = model->check_ctrs(cpu, &cpu_msrs[cpu], regs);
xen_mode = ring_0(regs);
if ( ovf && is_active(current->domain) && !xen_mode )
send_guest_vcpu_virq(current, VIRQ_XENOPROF);
if ( ovf == 2 )
current->nmi_pending = 1;
return 1;
}
void vpmu_do_interrupt(struct cpu_user_regs *regs)
{
struct vcpu *sampled = current, *sampling;
struct vpmu_struct *vpmu;
struct vlapic *vlapic;
u32 vlapic_lvtpc;
/*
* dom0 will handle interrupt for special domains (e.g. idle domain) or,
* in XENPMU_MODE_ALL, for everyone.
*/
if ( (vpmu_mode & XENPMU_MODE_ALL) ||
(sampled->domain->domain_id >= DOMID_FIRST_RESERVED) )
{
sampling = choose_hwdom_vcpu();
if ( !sampling )
return;
}
else
sampling = sampled;
vpmu = vcpu_vpmu(sampling);
if ( !vpmu->arch_vpmu_ops )
return;
/* PV(H) guest */
if ( !is_hvm_vcpu(sampling) || (vpmu_mode & XENPMU_MODE_ALL) )
{
const struct cpu_user_regs *cur_regs;
uint64_t *flags = &vpmu->xenpmu_data->pmu.pmu_flags;
domid_t domid;
if ( !vpmu->xenpmu_data )
return;
if ( is_pvh_vcpu(sampling) &&
!(vpmu_mode & XENPMU_MODE_ALL) &&
!vpmu->arch_vpmu_ops->do_interrupt(regs) )
return;
if ( vpmu_is_set(vpmu, VPMU_CACHED) )
return;
/* PV guest will be reading PMU MSRs from xenpmu_data */
vpmu_set(vpmu, VPMU_CONTEXT_SAVE | VPMU_CONTEXT_LOADED);
vpmu->arch_vpmu_ops->arch_vpmu_save(sampling, 1);
vpmu_reset(vpmu, VPMU_CONTEXT_SAVE | VPMU_CONTEXT_LOADED);
if ( has_hvm_container_vcpu(sampled) )
*flags = 0;
else
*flags = PMU_SAMPLE_PV;
if ( sampled == sampling )
domid = DOMID_SELF;
else
domid = sampled->domain->domain_id;
/* Store appropriate registers in xenpmu_data */
/* FIXME: 32-bit PVH should go here as well */
if ( is_pv_32bit_vcpu(sampling) )
{
/*
* 32-bit dom0 cannot process Xen's addresses (which are 64 bit)
* and therefore we treat it the same way as a non-privileged
* PV 32-bit domain.
*/
struct compat_pmu_regs *cmp;
cur_regs = guest_cpu_user_regs();
cmp = (void *)&vpmu->xenpmu_data->pmu.r.regs;
cmp->ip = cur_regs->rip;
cmp->sp = cur_regs->rsp;
cmp->flags = cur_regs->eflags;
cmp->ss = cur_regs->ss;
cmp->cs = cur_regs->cs;
if ( (cmp->cs & 3) > 1 )
*flags |= PMU_SAMPLE_USER;
}
else
{
struct xen_pmu_regs *r = &vpmu->xenpmu_data->pmu.r.regs;
if ( (vpmu_mode & XENPMU_MODE_SELF) )
cur_regs = guest_cpu_user_regs();
else if ( !guest_mode(regs) &&
is_hardware_domain(sampling->domain) )
{
cur_regs = regs;
domid = DOMID_XEN;
}
else
cur_regs = guest_cpu_user_regs();
r->ip = cur_regs->rip;
r->sp = cur_regs->rsp;
r->flags = cur_regs->eflags;
if ( !has_hvm_container_vcpu(sampled) )
{
r->ss = cur_regs->ss;
r->cs = cur_regs->cs;
if ( !(sampled->arch.flags & TF_kernel_mode) )
*flags |= PMU_SAMPLE_USER;
}
else
{
struct segment_register seg;
hvm_get_segment_register(sampled, x86_seg_cs, &seg);
r->cs = seg.sel;
hvm_get_segment_register(sampled, x86_seg_ss, &seg);
r->ss = seg.sel;
r->cpl = seg.attr.fields.dpl;
if ( !(sampled->arch.hvm_vcpu.guest_cr[0] & X86_CR0_PE) )
*flags |= PMU_SAMPLE_REAL;
}
}
vpmu->xenpmu_data->domain_id = domid;
vpmu->xenpmu_data->vcpu_id = sampled->vcpu_id;
if ( is_hardware_domain(sampling->domain) )
vpmu->xenpmu_data->pcpu_id = smp_processor_id();
else
vpmu->xenpmu_data->pcpu_id = sampled->vcpu_id;
vpmu->hw_lapic_lvtpc |= APIC_LVT_MASKED;
apic_write(APIC_LVTPC, vpmu->hw_lapic_lvtpc);
*flags |= PMU_CACHED;
vpmu_set(vpmu, VPMU_CACHED);
send_guest_vcpu_virq(sampling, VIRQ_XENPMU);
return;
}
/* HVM guests */
vlapic = vcpu_vlapic(sampling);
/* We don't support (yet) HVM dom0 */
ASSERT(sampling == sampled);
if ( !vpmu->arch_vpmu_ops->do_interrupt(regs) ||
!is_vlapic_lvtpc_enabled(vlapic) )
return;
vlapic_lvtpc = vlapic_get_reg(vlapic, APIC_LVTPC);
switch ( GET_APIC_DELIVERY_MODE(vlapic_lvtpc) )
{
case APIC_MODE_FIXED:
vlapic_set_irq(vlapic, vlapic_lvtpc & APIC_VECTOR_MASK, 0);
break;
case APIC_MODE_NMI:
sampling->nmi_pending = 1;
break;
}
}
/* VCPU PV timers. */
void send_timer_event(struct vcpu *v)
{
send_guest_vcpu_virq(v, VIRQ_TIMER);
}
