diff options
Diffstat (limited to 'docs/nvdimm.txt')
| -rw-r--r-- | docs/nvdimm.txt | 24 |
1 files changed, 17 insertions, 7 deletions
diff --git a/docs/nvdimm.txt b/docs/nvdimm.txt index c2c6e441b3..0aae682be3 100644 --- a/docs/nvdimm.txt +++ b/docs/nvdimm.txt @@ -17,8 +17,8 @@ following command line options: -machine pc,nvdimm -m $RAM_SIZE,slots=$N,maxmem=$MAX_SIZE - -object memory-backend-file,id=mem1,share=on,mem-path=$PATH,size=$NVDIMM_SIZE - -device nvdimm,id=nvdimm1,memdev=mem1 + -object memory-backend-file,id=mem1,share=on,mem-path=$PATH,size=$NVDIMM_SIZE,readonly=off + -device nvdimm,id=nvdimm1,memdev=mem1,unarmed=off Where, @@ -31,9 +31,10 @@ Where, of normal RAM devices and vNVDIMM devices, e.g. $MAX_SIZE should be >= $RAM_SIZE + $NVDIMM_SIZE here. - - "object memory-backend-file,id=mem1,share=on,mem-path=$PATH,size=$NVDIMM_SIZE" - creates a backend storage of size $NVDIMM_SIZE on a file $PATH. All - accesses to the virtual NVDIMM device go to the file $PATH. + - "object memory-backend-file,id=mem1,share=on,mem-path=$PATH, + size=$NVDIMM_SIZE,readonly=off" creates a backend storage of size + $NVDIMM_SIZE on a file $PATH. All accesses to the virtual NVDIMM device go + to the file $PATH. "share=on/off" controls the visibility of guest writes. If "share=on", then guest writes will be applied to the backend @@ -42,8 +43,17 @@ Where, "share=off", then guest writes won't be applied to the backend file and thus will be invisible to other guests. - - "device nvdimm,id=nvdimm1,memdev=mem1" creates a virtual NVDIMM - device whose storage is provided by above memory backend device. + "readonly=on/off" controls whether the file $PATH is opened read-only or + read/write (default). + + - "device nvdimm,id=nvdimm1,memdev=mem1,unarmed=off" creates a read/write + virtual NVDIMM device whose storage is provided by above memory backend + device. + + "unarmed" controls the ACPI NFIT NVDIMM Region Mapping Structure "NVDIMM + State Flags" Bit 3 indicating that the device is "unarmed" and cannot accept + persistent writes. Linux guest drivers set the device to read-only when this + bit is present. Set unarmed to on when the memdev has readonly=on. Multiple vNVDIMM devices can be created if multiple pairs of "-object" and "-device" are provided. |