Re: [Qemu-devel] [PATCH 3/3] vhost: improve region filtering

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

On Mon, Jan 09, 2012 at 02:04:54PM +0200, Avi Kivity wrote:
> vhost memory management doesn't care about non-memory (e.g. PIO) or non-RAM
> regions.  Adjust the filtering to reflect that, and move it earlier so it
> applies to mem_sections too.
> 
> Signed-off-by: Avi Kivity <avi@redhat.com>

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

> ---
>  hw/vhost.c |   19 +++++++++++++++----
>  1 files changed, 15 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/vhost.c b/hw/vhost.c
> index d924fb0..19a7b5c 100644
> --- a/hw/vhost.c
> +++ b/hw/vhost.c
> @@ -15,6 +15,7 @@
>  #include "hw/hw.h"
>  #include "range.h"
>  #include <linux/vhost.h>
> +#include "exec-memory.h"
>  
>  static void vhost_dev_sync_region(struct vhost_dev *dev,
>                                    MemoryRegionSection *section,
> @@ -365,10 +366,6 @@ static void vhost_set_memory(MemoryListener *listener,
>      int r;
>      void *ram;
>  
> -    if (!memory_region_is_ram(section->mr)) {
> -        return;
> -    }
> -
>      dev->mem = g_realloc(dev->mem, s);
>  
>      if (log_dirty) {
> @@ -430,12 +427,22 @@ static void vhost_set_memory(MemoryListener *listener,
>      }
>  }
>  
> +static bool vhost_section(MemoryRegionSection *section)
> +{
> +    return section->address_space == get_system_memory()
> +        && memory_region_is_ram(section->mr);
> +}
> +
>  static void vhost_region_add(MemoryListener *listener,
>                               MemoryRegionSection *section)
>  {
>      struct vhost_dev *dev = container_of(listener, struct vhost_dev,
>                                           memory_listener);
>  
> +    if (!vhost_section(section)) {
> +        return;
> +    }
> +
>      ++dev->n_mem_sections;
>      dev->mem_sections = g_renew(MemoryRegionSection, dev->mem_sections,
>                                  dev->n_mem_sections);
> @@ -450,6 +457,10 @@ static void vhost_region_del(MemoryListener *listener,
>                                           memory_listener);
>      int i;
>  
> +    if (!vhost_section(section)) {
> +        return;
> +    }
> +
>      vhost_set_memory(listener, section, false);
>      for (i = 0; i < dev->n_mem_sections; ++i) {
>          if (dev->mem_sections[i].offset_within_address_space
> -- 
> 1.7.7.1
>