[Qemu-devel] 答复: 转发: Re: [PATCH] vhost: skip RAM device memory sections

[lu.zhipeng]

i'm sorry ，it should be memory_region_is_ram_device in  new  version qemu , 
memory_region_is_skip_dump is in older version qemu.













芦志朋 luzhipeng






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原始邮件



发件人：王广10165992
收件人：芦志朋10108272
抄送人：杨斌10080747
日 期 ：2017年04月10日 09:05
主 题 ：转发: Re: [Qemu-devel] [PATCH] vhost: skip RAM device memory sections





























发件人： address@hidden
收件人：王广10165992 address@hidden
抄送人：芦志朋10108272 address@hidden
日 期 ：2017年04月08日 01:24
主 题 ：Re: [Qemu-devel] [PATCH] vhost: skip RAM device memory sections







On 08/04/2017 09:16, Wang guang wrote:
＞ From: ZhiPeng Lu address@hidden
＞ 
＞ A RAM device represents a mapping to a physical device, such as to a PCI
＞ * MMIO BAR of an vfio-pci assigned device.
＞ Vhost listens to this region,and increases the region's reference count
＞ while passthrough?for?network adapters (Physical Function, PF or Virtual 
Function, VF).
＞ After detaching   network adapters with  vhost backend dirver or vhost user 
dirver,
＞ it unregister vhost listen function  by memory_listener_unregister.
＞ After detaching the passthrough pf  or vf,
＞ the RAM device region's reference by  vhost listener increated can not be 
released,
＞ due to vhost listen function does not exist.So let's just skip RAM device 
memory.
＞ 
＞ Signed-off-by: ZhiPeng Lu address@hidden
＞ ---
＞  hw/virtio/vhost.c | 3 ++-
＞  1 file changed, 2 insertions(+), 1 deletion(-)
＞ 
＞ diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
＞ index 613494d..c1ff98f 100644
＞ --- a/hw/virtio/vhost.c
＞ +++ b/hw/virtio/vhost.c
＞ @@ -611,7 +611,8 @@ static void vhost_set_memory(MemoryListener *listener,
＞  static bool vhost_section(MemoryRegionSection *section)
＞  {
＞      return memory_region_is_ram(section-＞mr) &&
＞ -        !memory_region_is_rom(section-＞mr)
＞ +        !memory_region_is_rom(section-＞mr) &&
＞ +        !memory_region_is_skip_dump(section-＞mr)
＞  }

Why not memory_region_is_ram_device?

Paolo