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authorPankaj Gupta <pagupta@redhat.com>2019-07-05 17:03:23 +0300
committerDan Williams <dan.j.williams@intel.com>2019-07-06 01:19:10 +0300
commit6e84200c0a2994b991259d19450eee561029bf70 (patch)
tree66e3cd2cb9bf896803e6012148731cb4ddeaf36f /drivers/virtio
parentc5d4355d10d414a96ca870b731756b89d068d57a (diff)
downloadlinux-6e84200c0a2994b991259d19450eee561029bf70.tar.xz
virtio-pmem: Add virtio pmem driver
This patch adds virtio-pmem driver for KVM guest. Guest reads the persistent memory range information from Qemu over VIRTIO and registers it on nvdimm_bus. It also creates a nd_region object with the persistent memory range information so that existing 'nvdimm/pmem' driver can reserve this into system memory map. This way 'virtio-pmem' driver uses existing functionality of pmem driver to register persistent memory compatible for DAX capable filesystems. This also provides function to perform guest flush over VIRTIO from 'pmem' driver when userspace performs flush on DAX memory range. Signed-off-by: Pankaj Gupta <pagupta@redhat.com> Reviewed-by: Yuval Shaia <yuval.shaia@oracle.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Jakub Staron <jstaron@google.com> Tested-by: Jakub Staron <jstaron@google.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/virtio')
-rw-r--r--drivers/virtio/Kconfig11
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
index 023fc3bc01c6..078615cf2afc 100644
--- a/drivers/virtio/Kconfig
+++ b/drivers/virtio/Kconfig
@@ -43,6 +43,17 @@ config VIRTIO_PCI_LEGACY
If unsure, say Y.
+config VIRTIO_PMEM
+ tristate "Support for virtio pmem driver"
+ depends on VIRTIO
+ depends on LIBNVDIMM
+ help
+ This driver provides access to virtio-pmem devices, storage devices
+ that are mapped into the physical address space - similar to NVDIMMs
+ - with a virtio-based flushing interface.
+
+ If unsure, say Y.
+
config VIRTIO_BALLOON
tristate "Virtio balloon driver"
depends on VIRTIO