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kvm: Add kvm_set_user_memory tracepoint 

This adds a tracepoint to trace the KVM_SET_USER_MEMORY_REGION ioctl
parameters which is quite useful for debugging VFIO memory regions
being actually registered with KVM.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Message-Id: <20171215052326.21386-1-aik@ozlabs.ru>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Alexey Kardashevskiy 2017-12-15 16:23:26 +11:00 committed by Paolo Bonzini
parent bf85388169
commit fe29141bee
2 changed files with 6 additions and 1 deletions
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6
accel/kvm/kvm-all.c
View File

@ -235,6 +235,7 @@ static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot)
{
KVMState *s = kvm_state;
struct kvm_userspace_memory_region mem;
int ret;
mem.slot = slot->slot | (kml->as_id << 16);
mem.guest_phys_addr = slot->start_addr;
@ -248,7 +249,10 @@ static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot)
kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
}
mem.memory_size = slot->memory_size;
return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
ret = kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
trace_kvm_set_user_memory(mem.slot, mem.flags, mem.guest_phys_addr,
mem.memory_size, mem.userspace_addr, ret);
return ret;
}
int kvm_destroy_vcpu(CPUState *cpu)

1
accel/kvm/trace-events
View File

@ -12,4 +12,5 @@ kvm_irqchip_commit_routes(void) ""
kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector %d virq %d"
kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
kvm_irqchip_release_virq(int virq) "virq %d"
kvm_set_user_memory(uint32_t slot, uint32_t flags, uint64_t guest_phys_addr, uint64_t memory_size, uint64_t userspace_addr, int ret) "Slot#%d flags=0x%x gpa=0x%"PRIx64 " size=0x%"PRIx64 " ua=0x%"PRIx64 " ret=%d"