From: Pankaj Gupta <pagupta@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
qemu-devel@nongnu.org, linux-nvdimm@ml01.01.org,
linux-fsdevel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
linux-acpi@vger.kernel.org, linux-ext4@vger.kernel.org,
linux-xfs@vger.kernel.org, jack@suse.cz, stefanha@redhat.com,
dan j williams <dan.j.williams@intel.com>,
riel@surriel.com, nilal@redhat.com, kwolf@redhat.com,
pbonzini@redhat.com, zwisler@kernel.org,
vishal l verma <vishal.l.verma@intel.com>,
dave jiang <dave.jiang@intel.com>,
david@redhat.com, jmoyer@redhat.com,
xiaoguangrong eric <xiaoguangrong.eric@gmail.com>,
hch@infradead.org, jasowang@redhat.com, lcapitulino@redhat.com,
imammedo@redhat.com, eblake@redhat.com, willy@infradead.org,
tytso@mit.edu, adilger kernel <adilger.kernel@dilger.ca>,
darrick wong <darrick.wong@oracle.com>,
rjw@rjwysocki.net
Subject: Re: [PATCH v3 2/5] virtio-pmem: Add virtio pmem driver
Date: Tue, 15 Jan 2019 01:33:25 -0500 (EST) [thread overview]
Message-ID: <1129179757.64324084.1547534005220.JavaMail.zimbra@redhat.com> (raw)
Message-ID: <20190115063325.-RaqfxU7NiQpxp0hBCkIFT08bua7I3y8LGxmklUI9JA@z> (raw)
In-Reply-To: <20190114105314-mutt-send-email-mst@kernel.org>
> > 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>
> > ---
> > drivers/nvdimm/virtio_pmem.c | 84 ++++++++++++++++++++++++++
> > drivers/virtio/Kconfig | 10 ++++
> > drivers/virtio/Makefile | 1 +
> > drivers/virtio/pmem.c | 124
> > +++++++++++++++++++++++++++++++++++++++
> > include/linux/virtio_pmem.h | 60 +++++++++++++++++++
> > include/uapi/linux/virtio_ids.h | 1 +
> > include/uapi/linux/virtio_pmem.h | 10 ++++
>
> As with any uapi change, you need to CC the virtio dev
> mailing list (subscribers only, sorry about that).
Sure, will add virtio dev mailing list while sending v4.
Thanks,
Pankaj
>
>
> > 7 files changed, 290 insertions(+)
> > create mode 100644 drivers/nvdimm/virtio_pmem.c
> > create mode 100644 drivers/virtio/pmem.c
> > create mode 100644 include/linux/virtio_pmem.h
> > create mode 100644 include/uapi/linux/virtio_pmem.h
> >
> > diff --git a/drivers/nvdimm/virtio_pmem.c b/drivers/nvdimm/virtio_pmem.c
> > new file mode 100644
> > index 0000000..2a1b1ba
> > --- /dev/null
> > +++ b/drivers/nvdimm/virtio_pmem.c
> > @@ -0,0 +1,84 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * virtio_pmem.c: Virtio pmem Driver
> > + *
> > + * Discovers persistent memory range information
> > + * from host and provides a virtio based flushing
> > + * interface.
> > + */
> > +#include <linux/virtio_pmem.h>
> > +#include "nd.h"
> > +
> > + /* The interrupt handler */
> > +void host_ack(struct virtqueue *vq)
> > +{
> > + unsigned int len;
> > + unsigned long flags;
> > + struct virtio_pmem_request *req, *req_buf;
> > + struct virtio_pmem *vpmem = vq->vdev->priv;
> > +
> > + spin_lock_irqsave(&vpmem->pmem_lock, flags);
> > + while ((req = virtqueue_get_buf(vq, &len)) != NULL) {
> > + req->done = true;
> > + wake_up(&req->host_acked);
> > +
> > + if (!list_empty(&vpmem->req_list)) {
> > + req_buf = list_first_entry(&vpmem->req_list,
> > + struct virtio_pmem_request, list);
> > + list_del(&vpmem->req_list);
> > + req_buf->wq_buf_avail = true;
> > + wake_up(&req_buf->wq_buf);
> > + }
> > + }
> > + spin_unlock_irqrestore(&vpmem->pmem_lock, flags);
> > +}
> > +EXPORT_SYMBOL_GPL(host_ack);
> > +
> > + /* The request submission function */
> > +int virtio_pmem_flush(struct nd_region *nd_region)
> > +{
> > + int err;
> > + unsigned long flags;
> > + struct scatterlist *sgs[2], sg, ret;
> > + struct virtio_device *vdev = nd_region->provider_data;
> > + struct virtio_pmem *vpmem = vdev->priv;
> > + struct virtio_pmem_request *req;
> > +
> > + might_sleep();
> > + req = kmalloc(sizeof(*req), GFP_KERNEL);
> > + if (!req)
> > + return -ENOMEM;
> > +
> > + req->done = req->wq_buf_avail = false;
> > + strcpy(req->name, "FLUSH");
> > + init_waitqueue_head(&req->host_acked);
> > + init_waitqueue_head(&req->wq_buf);
> > + sg_init_one(&sg, req->name, strlen(req->name));
> > + sgs[0] = &sg;
> > + sg_init_one(&ret, &req->ret, sizeof(req->ret));
> > + sgs[1] = &ret;
> > +
> > + spin_lock_irqsave(&vpmem->pmem_lock, flags);
> > + err = virtqueue_add_sgs(vpmem->req_vq, sgs, 1, 1, req, GFP_ATOMIC);
> > + if (err) {
> > + dev_err(&vdev->dev, "failed to send command to virtio pmem device\n");
> > +
> > + list_add_tail(&vpmem->req_list, &req->list);
> > + spin_unlock_irqrestore(&vpmem->pmem_lock, flags);
> > +
> > + /* When host has read buffer, this completes via host_ack */
> > + wait_event(req->wq_buf, req->wq_buf_avail);
> > + spin_lock_irqsave(&vpmem->pmem_lock, flags);
> > + }
> > + virtqueue_kick(vpmem->req_vq);
> > + spin_unlock_irqrestore(&vpmem->pmem_lock, flags);
> > +
> > + /* When host has read buffer, this completes via host_ack */
> > + wait_event(req->host_acked, req->done);
> > + err = req->ret;
> > + kfree(req);
> > +
> > + return err;
> > +};
> > +EXPORT_SYMBOL_GPL(virtio_pmem_flush);
> > +MODULE_LICENSE("GPL");
> > diff --git a/drivers/virtio/Kconfig b/drivers/virtio/Kconfig
> > index 3589764..9f634a2 100644
> > --- a/drivers/virtio/Kconfig
> > +++ b/drivers/virtio/Kconfig
> > @@ -42,6 +42,16 @@ 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 support for virtio based flushing interface
> > + for persistent memory range.
> > +
> > + If unsure, say M.
> > +
> > config VIRTIO_BALLOON
> > tristate "Virtio balloon driver"
> > depends on VIRTIO
> > diff --git a/drivers/virtio/Makefile b/drivers/virtio/Makefile
> > index 3a2b5c5..143ce91 100644
> > --- a/drivers/virtio/Makefile
> > +++ b/drivers/virtio/Makefile
> > @@ -6,3 +6,4 @@ virtio_pci-y := virtio_pci_modern.o virtio_pci_common.o
> > virtio_pci-$(CONFIG_VIRTIO_PCI_LEGACY) += virtio_pci_legacy.o
> > obj-$(CONFIG_VIRTIO_BALLOON) += virtio_balloon.o
> > obj-$(CONFIG_VIRTIO_INPUT) += virtio_input.o
> > +obj-$(CONFIG_VIRTIO_PMEM) += pmem.o ../nvdimm/virtio_pmem.o
> > diff --git a/drivers/virtio/pmem.c b/drivers/virtio/pmem.c
> > new file mode 100644
> > index 0000000..51f5349
> > --- /dev/null
> > +++ b/drivers/virtio/pmem.c
> > @@ -0,0 +1,124 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * virtio_pmem.c: Virtio pmem Driver
> > + *
> > + * Discovers persistent memory range information
> > + * from host and registers the virtual pmem device
> > + * with libnvdimm core.
> > + */
> > +#include <linux/virtio_pmem.h>
> > +#include <../../drivers/nvdimm/nd.h>
> > +
> > +static struct virtio_device_id id_table[] = {
> > + { VIRTIO_ID_PMEM, VIRTIO_DEV_ANY_ID },
> > + { 0 },
> > +};
> > +
> > + /* Initialize virt queue */
> > +static int init_vq(struct virtio_pmem *vpmem)
> > +{
> > + struct virtqueue *vq;
> > +
> > + /* single vq */
> > + vpmem->req_vq = vq = virtio_find_single_vq(vpmem->vdev,
> > + host_ack, "flush_queue");
> > + if (IS_ERR(vq))
> > + return PTR_ERR(vq);
> > +
> > + spin_lock_init(&vpmem->pmem_lock);
> > + INIT_LIST_HEAD(&vpmem->req_list);
> > +
> > + return 0;
> > +};
> > +
> > +static int virtio_pmem_probe(struct virtio_device *vdev)
> > +{
> > + int err = 0;
> > + struct resource res;
> > + struct virtio_pmem *vpmem;
> > + struct nvdimm_bus *nvdimm_bus;
> > + struct nd_region_desc ndr_desc;
> > + int nid = dev_to_node(&vdev->dev);
> > + struct nd_region *nd_region;
> > +
> > + if (!vdev->config->get) {
> > + dev_err(&vdev->dev, "%s failure: config disabled\n",
> > + __func__);
> > + return -EINVAL;
> > + }
> > +
> > + vdev->priv = vpmem = devm_kzalloc(&vdev->dev, sizeof(*vpmem),
> > + GFP_KERNEL);
> > + if (!vpmem) {
> > + err = -ENOMEM;
> > + goto out_err;
> > + }
> > +
> > + vpmem->vdev = vdev;
> > + err = init_vq(vpmem);
> > + if (err)
> > + goto out_err;
> > +
> > + virtio_cread(vpmem->vdev, struct virtio_pmem_config,
> > + start, &vpmem->start);
> > + virtio_cread(vpmem->vdev, struct virtio_pmem_config,
> > + size, &vpmem->size);
> > +
> > + res.start = vpmem->start;
> > + res.end = vpmem->start + vpmem->size-1;
> > + vpmem->nd_desc.provider_name = "virtio-pmem";
> > + vpmem->nd_desc.module = THIS_MODULE;
> > +
> > + vpmem->nvdimm_bus = nvdimm_bus = nvdimm_bus_register(&vdev->dev,
> > + &vpmem->nd_desc);
> > + if (!nvdimm_bus)
> > + goto out_vq;
> > +
> > + dev_set_drvdata(&vdev->dev, nvdimm_bus);
> > + memset(&ndr_desc, 0, sizeof(ndr_desc));
> > +
> > + ndr_desc.res = &res;
> > + ndr_desc.numa_node = nid;
> > + ndr_desc.flush = virtio_pmem_flush;
> > + set_bit(ND_REGION_PAGEMAP, &ndr_desc.flags);
> > + nd_region = nvdimm_pmem_region_create(nvdimm_bus, &ndr_desc);
> > + nd_region->provider_data = dev_to_virtio
> > + (nd_region->dev.parent->parent);
> > +
> > + if (!nd_region)
> > + goto out_nd;
> > +
> > + //virtio_device_ready(vdev);
> > + return 0;
> > +out_nd:
> > + err = -ENXIO;
> > + nvdimm_bus_unregister(nvdimm_bus);
> > +out_vq:
> > + vdev->config->del_vqs(vdev);
> > +out_err:
> > + dev_err(&vdev->dev, "failed to register virtio pmem memory\n");
> > + return err;
> > +}
> > +
> > +static void virtio_pmem_remove(struct virtio_device *vdev)
> > +{
> > + struct virtio_pmem *vpmem = vdev->priv;
> > + struct nvdimm_bus *nvdimm_bus = dev_get_drvdata(&vdev->dev);
> > +
> > + nvdimm_bus_unregister(nvdimm_bus);
> > + vdev->config->del_vqs(vdev);
> > + kfree(vpmem);
> > +}
> > +
> > +static struct virtio_driver virtio_pmem_driver = {
> > + .driver.name = KBUILD_MODNAME,
> > + .driver.owner = THIS_MODULE,
> > + .id_table = id_table,
> > + .probe = virtio_pmem_probe,
> > + .remove = virtio_pmem_remove,
> > +};
> > +
> > +module_virtio_driver(virtio_pmem_driver);
> > +MODULE_DEVICE_TABLE(virtio, id_table);
> > +MODULE_DESCRIPTION("Virtio pmem driver");
> > +MODULE_LICENSE("GPL");
> > diff --git a/include/linux/virtio_pmem.h b/include/linux/virtio_pmem.h
> > new file mode 100644
> > index 0000000..224f9d9
> > --- /dev/null
> > +++ b/include/linux/virtio_pmem.h
> > @@ -0,0 +1,60 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * virtio_pmem.h: virtio pmem Driver
> > + *
> > + * Discovers persistent memory range information
> > + * from host and provides a virtio based flushing
> > + * interface.
> > + **/
> > +
> > +#ifndef _LINUX_VIRTIO_PMEM_H
> > +#define _LINUX_VIRTIO_PMEM_H
> > +
> > +#include <linux/virtio_ids.h>
> > +#include <linux/module.h>
> > +#include <linux/virtio_config.h>
> > +#include <uapi/linux/virtio_pmem.h>
> > +#include <linux/libnvdimm.h>
> > +#include <linux/spinlock.h>
> > +
> > +struct virtio_pmem_request {
> > + /* Host return status corresponding to flush request */
> > + int ret;
> > +
> > + /* command name*/
> > + char name[16];
> > +
> > + /* Wait queue to process deferred work after ack from host */
> > + wait_queue_head_t host_acked;
> > + bool done;
> > +
> > + /* Wait queue to process deferred work after virt queue buffer avail */
> > + wait_queue_head_t wq_buf;
> > + bool wq_buf_avail;
> > + struct list_head list;
> > +};
> > +
> > +struct virtio_pmem {
> > + struct virtio_device *vdev;
> > +
> > + /* Virtio pmem request queue */
> > + struct virtqueue *req_vq;
> > +
> > + /* nvdimm bus registers virtio pmem device */
> > + struct nvdimm_bus *nvdimm_bus;
> > + struct nvdimm_bus_descriptor nd_desc;
> > +
> > + /* List to store deferred work if virtqueue is full */
> > + struct list_head req_list;
> > +
> > + /* Synchronize virtqueue data */
> > + spinlock_t pmem_lock;
> > +
> > + /* Memory region information */
> > + uint64_t start;
> > + uint64_t size;
> > +};
> > +
> > +void host_ack(struct virtqueue *vq);
> > +int virtio_pmem_flush(struct nd_region *nd_region);
> > +#endif
> > diff --git a/include/uapi/linux/virtio_ids.h
> > b/include/uapi/linux/virtio_ids.h
> > index 6d5c3b2..3463895 100644
> > --- a/include/uapi/linux/virtio_ids.h
> > +++ b/include/uapi/linux/virtio_ids.h
> > @@ -43,5 +43,6 @@
> > #define VIRTIO_ID_INPUT 18 /* virtio input */
> > #define VIRTIO_ID_VSOCK 19 /* virtio vsock transport */
> > #define VIRTIO_ID_CRYPTO 20 /* virtio crypto */
> > +#define VIRTIO_ID_PMEM 25 /* virtio pmem */
> >
> > #endif /* _LINUX_VIRTIO_IDS_H */
> > diff --git a/include/uapi/linux/virtio_pmem.h
> > b/include/uapi/linux/virtio_pmem.h
> > new file mode 100644
> > index 0000000..fa3f7d5
> > --- /dev/null
> > +++ b/include/uapi/linux/virtio_pmem.h
> > @@ -0,0 +1,10 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +
> > +#ifndef _UAPI_LINUX_VIRTIO_PMEM_H
> > +#define _UAPI_LINUX_VIRTIO_PMEM_H
> > +
> > +struct virtio_pmem_config {
> > + __le64 start;
> > + __le64 size;
> > +};
> > +#endif
> > --
> > 2.9.3
>
next prev parent reply other threads:[~2019-01-15 6:33 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-09 14:47 [PATCH v3 0/5] kvm "virtio pmem" device Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 1/5] libnvdimm: nd_region flush callback support Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 2/5] virtio-pmem: Add virtio pmem driver Pankaj Gupta
2019-01-14 15:54 ` Michael S. Tsirkin
2019-01-14 15:54 ` Michael S. Tsirkin
[not found] ` <20190114105314-mutt-send-email-mst-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2019-01-15 6:33 ` Pankaj Gupta [this message]
2019-01-15 6:33 ` Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 3/5] libnvdimm: add nd_region buffered dax_dev flag Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 4/5] ext4: disable map_sync for virtio pmem Pankaj Gupta
2019-01-09 14:47 ` [PATCH v3 5/5] xfs: " Pankaj Gupta
2019-01-09 14:47 ` Pankaj Gupta
2019-01-09 16:26 ` Darrick J. Wong
2019-01-09 18:08 ` Pankaj Gupta
[not found] ` <20190109144736.17452-1-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-10 1:26 ` [PATCH v3 0/5] kvm "virtio pmem" device Dave Chinner
2019-01-10 1:26 ` Dave Chinner
2019-01-10 2:40 ` Rik van Riel
2019-01-10 2:40 ` Rik van Riel
2019-01-10 10:17 ` Jan Kara
2019-01-10 10:17 ` Jan Kara
[not found] ` <20190110101757.GC15790-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2019-01-13 1:38 ` Pankaj Gupta
2019-01-13 1:38 ` Pankaj Gupta
[not found] ` <1354249849.63357171.1547343519970.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-13 1:43 ` Dan Williams
2019-01-13 1:43 ` Dan Williams
[not found] ` <CAPcyv4hwcgTUpgNCefCGu4DvgkYBp5b=f+hJ+FC=s5APYKoycg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-01-13 2:17 ` [Qemu-devel] " Pankaj Gupta
2019-01-13 2:17 ` Pankaj Gupta
[not found] ` <540171952.63371441.1547345866585.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-14 9:55 ` Jan Kara
2019-01-14 9:55 ` Jan Kara
[not found] ` <20190114095520.GC13316-4I4JzKEfoa/jFM9bn6wA6Q@public.gmane.org>
2019-01-14 10:16 ` Pankaj Gupta
2019-01-14 10:16 ` Pankaj Gupta
2019-01-11 7:45 ` Pankaj Gupta
2019-01-11 7:45 ` Pankaj Gupta
[not found] ` <1326478078.61913951.1547192704870.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-13 23:29 ` Dave Chinner
2019-01-13 23:29 ` Dave Chinner
2019-01-13 23:38 ` Matthew Wilcox
2019-01-13 23:38 ` Matthew Wilcox
[not found] ` <20190113233820.GX6310-PfSpb0PWhxZc2C7mugBRk2EX/6BAtgUQ@public.gmane.org>
2019-01-14 2:50 ` Dave Chinner
2019-01-14 2:50 ` Dave Chinner
2019-01-14 7:15 ` Pankaj Gupta
2019-01-14 7:15 ` Pankaj Gupta
[not found] ` <942065073.64011540.1547450140670.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-14 21:25 ` Dave Chinner
2019-01-14 21:25 ` Dave Chinner
2019-01-14 21:35 ` Dan Williams
2019-01-14 21:35 ` Dan Williams
[not found] ` <CAPcyv4jtPcLV-s0sKNHwwk0ug7GLBV6699dpm1h3r2xSo879dg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2019-01-14 22:21 ` Dave Chinner
2019-01-14 22:21 ` Dave Chinner
2019-01-15 2:19 ` Michael S. Tsirkin
2019-01-15 2:19 ` Michael S. Tsirkin
[not found] ` <20190114205031-mutt-send-email-mst-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
2019-01-15 5:37 ` [Qemu-devel] " Pankaj Gupta
2019-01-15 5:37 ` Pankaj Gupta
2019-01-15 5:35 ` Pankaj Gupta
2019-01-15 5:35 ` Pankaj Gupta
[not found] ` <1684638419.64320214.1547530506805.JavaMail.zimbra-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2019-01-15 20:42 ` Dave Chinner
2019-01-15 20:42 ` Dave Chinner
2019-02-04 22:56 ` security implications of caching with virtio pmem (was Re: [PATCH v3 0/5] kvm "virtio pmem" device) Michael S. Tsirkin
2019-02-05 7:29 ` [Qemu-devel] " Pankaj Gupta
2019-02-06 14:00 ` David Hildenbrand
2019-02-06 18:01 ` Michael S. Tsirkin
2019-02-11 7:29 ` [Qemu-devel] " Pankaj Gupta
2019-02-11 22:29 ` Dave Chinner
2019-02-11 22:58 ` David Hildenbrand
2019-02-11 23:07 ` Michael S. Tsirkin
-- strict thread matches above, loose matches on Subject: below --
2019-01-09 13:50 [PATCH v3 0/5] kvm "virtio pmem" device Pankaj Gupta
2019-01-09 13:50 ` [PATCH v3 2/5] virtio-pmem: Add virtio pmem driver Pankaj Gupta
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