On 04/25/2018 06:24 AM, Pankaj Gupta wrote: > This patch adds virtio-pmem Qemu device. > > This device presents memory address range > information to guest which is backed by file > backend type. It acts like persistent memory > device for KVM guest. Guest can perform read > and persistent write operations on this memory > range with the help of DAX capable filesystem. > > Persistent guest writes are assured with the > help of virtio based flushing interface. When > guest userspace space performs fsync on file > fd on pmem device, a flush command is send to > Qemu over VIRTIO and host side flush/sync is > done on backing image file. > > This PV device code is dependent and tested > with 'David Hildenbrand's ' patchset[1] to > map non-PCDIMM devices to guest address space. This sentence doesn't belong in git history. It is better to put information like this... > There is still upstream discussion on using > among PCI bar vs memory device, will update > as per concensus. s/concensus/consensus/ > > [1] https://marc.info/?l=qemu-devel&m=152450249319168&w=2 > > Signed-off-by: Pankaj Gupta <pagupta@xxxxxxxxxx> > --- ...here, where it is part of the email, but not picked up by 'git am'. > +++ b/qapi/misc.json > @@ -2871,6 +2871,29 @@ > } > } > > +## > +# @VirtioPMemDeviceInfo: > +# > +# VirtioPMem state information > +# > +# @id: device's ID > +# > +# @start: physical address, where device is mapped > +# > +# @size: size of memory that the device provides > +# > +# @memdev: memory backend linked with device > +# > +# Since: 2.13 > +## > +{ 'struct': 'VirtioPMemDeviceInfo', > + 'data': { '*id': 'str', > + 'start': 'size', > + 'size': 'size', TAB damage. > + 'memdev': 'str' > + } > +} > + > ## > # @MemoryDeviceInfo: > # > @@ -2880,7 +2903,8 @@ > ## > { 'union': 'MemoryDeviceInfo', > 'data': { 'dimm': 'PCDIMMDeviceInfo', > - 'nvdimm': 'PCDIMMDeviceInfo' > + 'nvdimm': 'PCDIMMDeviceInfo', > + 'virtio-pmem': 'VirtioPMemDeviceInfo' > } > } > > -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3266 Virtualization: qemu.org | libvirt.org
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