From: Changyuan Lyu <changyuanl@google.com>
To: Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
"Michael S . Tsirkin" <mst@redhat.com>,
Jason Wang <jasowang@redhat.com>
Cc: Xuan Zhuo <xuanzhuo@linux.alibaba.com>,
Dan Williams <dan.j.williams@intel.com>,
Vishal Verma <vishal.l.verma@intel.com>,
Dave Jiang <dave.jiang@intel.com>,
virtualization@lists.linux.dev, nvdimm@lists.linux.dev,
linux-kernel@vger.kernel.org,
Changyuan Lyu <changyuanl@google.com>
Subject: [PATCH] virtio_pmem: support feature SHMEM_REGION
Date: Mon, 18 Dec 2023 23:18:49 -0800 [thread overview]
Message-ID: <20231219071849.3912896-1-changyuanl@google.com> (raw)
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 <changyuanl@google.com>
---
drivers/nvdimm/virtio_pmem.c | 29 +++++++++++++++++++++++++----
include/uapi/linux/virtio_pmem.h | 8 ++++++++
2 files changed, 33 insertions(+), 4 deletions(-)
diff --git a/drivers/nvdimm/virtio_pmem.c b/drivers/nvdimm/virtio_pmem.c
index a92eb172f0e7..5b28d543728b 100644
--- a/drivers/nvdimm/virtio_pmem.c
+++ b/drivers/nvdimm/virtio_pmem.c
@@ -35,6 +35,8 @@ static int virtio_pmem_probe(struct virtio_device *vdev)
struct nd_region *nd_region;
struct virtio_pmem *vpmem;
struct resource res;
+ struct virtio_shm_region shm_reg;
+ bool have_shm;
int err = 0;
if (!vdev->config->get) {
@@ -57,10 +59,23 @@ static int virtio_pmem_probe(struct virtio_device *vdev)
goto out_err;
}
- virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
- start, &vpmem->start);
- virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
- size, &vpmem->size);
+ if (virtio_has_feature(vdev, VIRTIO_PMEM_F_SHMEM_REGION)) {
+ have_shm = virtio_get_shm_region(vdev, &shm_reg,
+ (u8)VIRTIO_PMEM_SHMCAP_ID);
+ if (!have_shm) {
+ dev_err(&vdev->dev, "failed to get shared memory region %d\n",
+ VIRTIO_PMEM_SHMCAP_ID);
+ return -EINVAL;
+ }
+ vpmem->start = shm_reg.addr;
+ vpmem->size = shm_reg.len;
+ } else {
+ virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
+ start, &vpmem->start);
+ virtio_cread_le(vpmem->vdev, struct virtio_pmem_config,
+ size, &vpmem->size);
+ }
+
res.start = vpmem->start;
res.end = vpmem->start + vpmem->size - 1;
@@ -122,7 +137,13 @@ static void virtio_pmem_remove(struct virtio_device *vdev)
virtio_reset_device(vdev);
}
+static unsigned int features[] = {
+ VIRTIO_PMEM_F_SHMEM_REGION,
+};
+
static struct virtio_driver virtio_pmem_driver = {
+ .feature_table = features,
+ .feature_table_size = ARRAY_SIZE(features),
.driver.name = KBUILD_MODNAME,
.driver.owner = THIS_MODULE,
.id_table = id_table,
diff --git a/include/uapi/linux/virtio_pmem.h b/include/uapi/linux/virtio_pmem.h
index d676b3620383..025174f6eacf 100644
--- a/include/uapi/linux/virtio_pmem.h
+++ b/include/uapi/linux/virtio_pmem.h
@@ -14,6 +14,14 @@
#include <linux/virtio_ids.h>
#include <linux/virtio_config.h>
+/* Feature bits */
+#define VIRTIO_PMEM_F_SHMEM_REGION 0 /* guest physical address range will be
+ * indicated as shared memory region 0
+ */
+
+/* shmid of the shared memory region corresponding to the pmem */
+#define VIRTIO_PMEM_SHMCAP_ID 0
+
struct virtio_pmem_config {
__le64 start;
__le64 size;
--
2.43.0.472.g3155946c3a-goog
next reply other threads:[~2023-12-19 7:19 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-19 7:18 Changyuan Lyu [this message]
2023-12-20 3:57 ` [PATCH] virtio_pmem: support feature SHMEM_REGION Jason Wang
2023-12-20 6:13 ` [PATCH v2] " Changyuan Lyu
2023-12-20 7:01 ` Michael S. Tsirkin
2023-12-20 7:32 ` [PATCH v3] " Changyuan Lyu
2023-12-20 7:44 ` Michael S. Tsirkin
2023-12-20 20:49 ` [PATCH v4] " Changyuan Lyu
2023-12-27 2:51 ` Jason Wang
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