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Message-Id: <20230912030008.3599514-2-lulu@redhat.com>
Date: Tue, 12 Sep 2023 11:00:05 +0800
From: Cindy Lu <lulu@...hat.com>
To: lulu@...hat.com,
jasowang@...hat.com,
mst@...hat.com,
maxime.coquelin@...hat.com,
xieyongji@...edance.com,
kvm@...r.kernel.org,
linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org,
netdev@...r.kernel.org
Cc: stable@...r.kernel.org
Subject: [RFC v2 1/4] vduse: Add function to get/free the pages for reconnection
Add the function vduse_alloc_reconnnect_info_mem
and vduse_alloc_reconnnect_info_mem
In this 2 function, vduse will get/free (vq_num + 1)*page
Page 0 will be used to save the reconnection information, The
Userspace App will maintain this. Page 1 ~ vq_num + 1 will save
the reconnection information for vqs.
Signed-off-by: Cindy Lu <lulu@...hat.com>
---
drivers/vdpa/vdpa_user/vduse_dev.c | 86 ++++++++++++++++++++++++++++++
1 file changed, 86 insertions(+)
diff --git a/drivers/vdpa/vdpa_user/vduse_dev.c b/drivers/vdpa/vdpa_user/vduse_dev.c
index 26b7e29cb900..4c256fa31fc4 100644
--- a/drivers/vdpa/vdpa_user/vduse_dev.c
+++ b/drivers/vdpa/vdpa_user/vduse_dev.c
@@ -30,6 +30,10 @@
#include <uapi/linux/virtio_blk.h>
#include <linux/mod_devicetable.h>
+#ifdef CONFIG_X86
+#include <asm/set_memory.h>
+#endif
+
#include "iova_domain.h"
#define DRV_AUTHOR "Yongji Xie <xieyongji@...edance.com>"
@@ -41,6 +45,23 @@
#define VDUSE_IOVA_SIZE (128 * 1024 * 1024)
#define VDUSE_MSG_DEFAULT_TIMEOUT 30
+/* struct vdpa_reconnect_info save the page information for reconnection
+ * kernel will init these information while alloc the pages
+ * and use these information to free the pages
+ */
+struct vdpa_reconnect_info {
+ /* Offset (within vm_file) in PAGE_SIZE,
+ * this just for check, not using
+ */
+ u32 index;
+ /* physical address for this page*/
+ phys_addr_t addr;
+ /* virtual address for this page*/
+ unsigned long vaddr;
+ /* memory size, here always page_size*/
+ phys_addr_t size;
+};
+
struct vduse_virtqueue {
u16 index;
u16 num_max;
@@ -57,6 +78,7 @@ struct vduse_virtqueue {
struct vdpa_callback cb;
struct work_struct inject;
struct work_struct kick;
+ struct vdpa_reconnect_info reconnect_info;
};
struct vduse_dev;
@@ -106,6 +128,7 @@ struct vduse_dev {
u32 vq_align;
struct vduse_umem *umem;
struct mutex mem_lock;
+ struct vdpa_reconnect_info reconnect_status;
};
struct vduse_dev_msg {
@@ -1030,6 +1053,65 @@ static int vduse_dev_reg_umem(struct vduse_dev *dev,
return ret;
}
+int vduse_alloc_reconnnect_info_mem(struct vduse_dev *dev)
+{
+ struct vdpa_reconnect_info *info;
+ struct vduse_virtqueue *vq;
+ void *addr;
+
+ /*page 0 is use to save status,dpdk will use this to save the information
+ *needed in reconnection,kernel don't need to maintain this
+ */
+ info = &dev->reconnect_status;
+ addr = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!addr)
+ return -1;
+
+ info->addr = virt_to_phys(addr);
+ info->vaddr = (unsigned long)(addr);
+ info->size = PAGE_SIZE;
+ /* index is vm Offset in PAGE_SIZE */
+ info->index = 0;
+
+ /*page 1~ vq_num + 1 save the reconnect info for vqs*/
+ for (int i = 0; i < dev->vq_num + 1; i++) {
+ vq = &dev->vqs[i];
+ info = &vq->reconnect_info;
+ addr = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!addr)
+ return -1;
+
+ info->addr = virt_to_phys(addr);
+ info->vaddr = (unsigned long)(addr);
+ info->size = PAGE_SIZE;
+ info->index = i + 1;
+ }
+
+ return 0;
+}
+
+int vduse_free_reconnnect_info_mem(struct vduse_dev *dev)
+{
+ struct vdpa_reconnect_info *info;
+ struct vduse_virtqueue *vq;
+
+ info = &dev->reconnect_status;
+ free_page(info->vaddr);
+ info->size = 0;
+ info->addr = 0;
+ info->vaddr = 0;
+ for (int i = 0; i < dev->vq_num + 1; i++) {
+ vq = &dev->vqs[i];
+ info = &vq->reconnect_info;
+ free_page(info->vaddr);
+ info->size = 0;
+ info->addr = 0;
+ info->vaddr = 0;
+ }
+
+ return 0;
+}
+
static long vduse_dev_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
@@ -1390,6 +1472,8 @@ static int vduse_destroy_dev(char *name)
mutex_unlock(&dev->lock);
return -EBUSY;
}
+ vduse_free_reconnnect_info_mem(dev);
+
dev->connected = true;
mutex_unlock(&dev->lock);
@@ -1542,6 +1626,8 @@ static int vduse_create_dev(struct vduse_dev_config *config,
ret = PTR_ERR(dev->dev);
goto err_dev;
}
+
+ vduse_alloc_reconnnect_info_mem(dev);
__module_get(THIS_MODULE);
return 0;
--
2.34.3
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