virtio-pmem

软件环境：ubuntu20.04 aosp
硬件环境：x86 PC
目标：在host ubuntu20.04和Android虚拟机间测试virtio-virtio-pmem

1. 介绍

1.1 功能

• virtio_pmem：Guest绕过page cache直接访问主机缓存

1.2 crosvm使用

#Crosvm启动
#pmem入参
--rw-pmem-device=/home/cuttlefish/instances/cvd-1/access-kregistry 
--rw-pmem-device=/home/cuttlefish/instances/cvd-1/hwcomposer-pmem

#qemu启动
HOME=$PWD ./bin/launch_cvd -daemon -vm_manager=qemu_cli -display0=width=1080,height=600,dpi=160 

#pmem入参
-device nvdimm,memdev=objpmem0,id=ramoops 
-object memory-backend-file,id=objpmem1,share=on,mem-path=/home/cuttlefish/instances/cvd-1/access-kregistry,size=2097152 
-device virtio-pmem-pci,disable-legacy=on,memdev=objpmem1,id=pmem0 
-object memory-backend-file,id=objpmem2,share=on,mem-path=/home/cuttlefish/instances/cvd-1/hwcomposer-pmem,size=2097152 
-device virtio-pmem-pci,disable-legacy=on,memdev=objpmem2,id=pmem1 
-object rng-random,id=objrng0,filename=/dev/urandom 

1.3 Virtio-pmem

源码分析

1.4 Nvdimm