[PATCH v4] virtio_pmem: support feature SHMEM_REGION

Thanks Michael for the feedback! On Tue, Dec 19, 2023 at 11:44 PM Michael S. Tsirkin wrote: > > > On Tue, Dec 19, 2023 at 11:32:27PM -0800, Changyuan Lyu wrote: > > > > + if (!have_shm) { > > + dev_err(>dev, "failed to

[PATCH v3] virtio_pmem: support feature SHMEM_REGION

physical address range of the pmem is then determined by the physical address range of shared memory region 0. [1] https://docs.oasis-open.org/virtio/virtio/v1.2/csd01/virtio-v1.2-csd01.html#x1-6480002 Signed-off-by: Changyuan Lyu --- v3: * updated the patch description. V2:

[PATCH v2] virtio_pmem: support feature SHMEM_REGION

On Tue, Dec 19, 2023 at 7:57 PM Jason Wang wrote: > > On Tue, Dec 19, 2023 at 3:19 PM Changyuan Lyu wrote: > > > > +/* shmid of the shared memory region corresponding to the pmem */ > > +#define VIRTIO_PMEM_SHMCAP_ID 0 > > NIT: not a native speaker, but an

[PATCH] virtio_pmem: support feature SHMEM_REGION

As per virtio spec 1.2 section 5.19.5.2, if the feature VIRTIO_PMEM_F_SHMEM_REGION has been negotiated, the driver MUST query shared memory ID 0 for the physical address ranges. Signed-off-by: Changyuan Lyu --- drivers/nvdimm/virtio_pmem.c | 29 + include/uapi