Re: [Qemu-devel] [PATCH v2 1/4] vhost: add traces for memory listeners

["Michael S. Tsirkin" <mst@redhat.com>]

On Mon, Jan 22, 2018 at 02:02:41PM +0800, Peter Xu wrote:
> Trace these operations on two memory listeners.  It helps to verify the
> new memory listener fix, and good to keep them there.
> 
> Signed-off-by: Peter Xu <peterx@redhat.com>

I'm not sure what this have to do with vfio, but anyway:

Acked-by: Michael S. Tsirkin <mst@redhat.com>

> ---
>  hw/virtio/trace-events | 6 ++++++
>  hw/virtio/vhost.c      | 7 +++++++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
> index 775461ae98..2b8f81eb25 100644
> --- a/hw/virtio/trace-events
> +++ b/hw/virtio/trace-events
> @@ -25,3 +25,9 @@ virtio_balloon_handle_output(const char *name, uint64_t gpa) "section name: %s g
>  virtio_balloon_get_config(uint32_t num_pages, uint32_t actual) "num_pages: %d actual: %d"
>  virtio_balloon_set_config(uint32_t actual, uint32_t oldactual) "actual: %d oldactual: %d"
>  virtio_balloon_to_target(uint64_t target, uint32_t num_pages) "balloon target: 0x%"PRIx64" num_pages: %d"
> +
> +# hw/virtio/vhost.c
> +vhost_region_add(void *p, const char *mr) "dev %p mr %s"
> +vhost_region_del(void *p, const char *mr) "dev %p mr %s"
> +vhost_iommu_region_add(void *p, const char *mr) "dev %p mr %s"
> +vhost_iommu_region_del(void *p, const char *mr) "dev %p mr %s"
> diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
> index e4290ce93d..19a7a3cb37 100644
> --- a/hw/virtio/vhost.c
> +++ b/hw/virtio/vhost.c
> @@ -27,6 +27,7 @@
>  #include "hw/virtio/virtio-access.h"
>  #include "migration/blocker.h"
>  #include "sysemu/dma.h"
> +#include "trace.h"
>  
>  /* enabled until disconnected backend stabilizes */
>  #define _VHOST_DEBUG 1
> @@ -687,6 +688,7 @@ static void vhost_region_add(MemoryListener *listener,
>          return;
>      }
>  
> +    trace_vhost_region_add(dev, section->mr->name ?: NULL);
>      ++dev->n_mem_sections;
>      dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections,
>                                  dev->n_mem_sections);
> @@ -706,6 +708,7 @@ static void vhost_region_del(MemoryListener *listener,
>          return;
>      }
>  
> +    trace_vhost_region_del(dev, section->mr->name ?: NULL);
>      vhost_set_memory(listener, section, false);
>      memory_region_unref(section->mr);
>      for (i = 0; i < dev->n_mem_sections; ++i) {
> @@ -743,6 +746,8 @@ static void vhost_iommu_region_add(MemoryListener *listener,
>          return;
>      }
>  
> +    trace_vhost_iommu_region_add(dev, section->mr->name ?: NULL);
> +
>      iommu = g_malloc0(sizeof(*iommu));
>      end = int128_add(int128_make64(section->offset_within_region),
>                       section->size);
> @@ -771,6 +776,8 @@ static void vhost_iommu_region_del(MemoryListener *listener,
>          return;
>      }
>  
> +    trace_vhost_iommu_region_del(dev, section->mr->name ?: NULL);
> +
>      QLIST_FOREACH(iommu, &dev->iommu_list, iommu_next) {
>          if (iommu->mr == section->mr &&
>              iommu->n.start == section->offset_within_region) {
> -- 
> 2.14.3