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dm: virtio: implement vhost_set_mem_table 

vhost kernel driver needs the information of memory mapping between
GPA and the virtual addresses in device model process. This is
required for virtqueue related operations. This patch gets memory
mapping information from vmctx then conveys to vhost.

Tracked-On: #1329
Signed-off-by: Jian Jun Chen <jian.jun.chen@intel.com>
Acked-by: Yu Wang <yu1.wang@intel.com>
This commit is contained in:
Jian Jun Chen 2018-08-10 15:06:05 +08:00 committed by lijinxia
parent befbc3e924
commit 150ad30b09
1 changed files with 63 additions and 2 deletions
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65
devicemodel/hw/pci/virtio/vhost.c
View File

@ -44,6 +44,14 @@ vhost_kernel_deinit(struct vhost_dev *vdev)
/* to be implemented */
}
static int
vhost_kernel_set_mem_table(struct vhost_dev *vdev,
struct vhost_memory *mem)
{
/* to be implemented */
return -1;
}
static int
vhost_kernel_set_vring_addr(struct vhost_dev *vdev,
struct vhost_vring_addr *addr)
@ -370,8 +378,61 @@ vhost_vq_stop(struct vhost_dev *vdev, int idx)
static int
vhost_set_mem_table(struct vhost_dev *vdev)
{
/* to be implemented */
return -1;
struct vmctx *ctx;
struct vhost_memory *mem;
uint32_t nregions = 0;
int rc;
ctx = vdev->base->dev->vmctx;
if (ctx->lowmem > 0)
nregions++;
if (ctx->highmem > 0)
nregions++;
mem = calloc(1, sizeof(struct vhost_memory) +
sizeof(struct vhost_memory_region) * nregions);
if (!mem) {
WPRINTF("out of memory\n");
return -1;
}
nregions = 0;
if (ctx->lowmem > 0) {
mem->regions[nregions].guest_phys_addr = (uintptr_t)0;
mem->regions[nregions].memory_size = ctx->lowmem;
mem->regions[nregions].userspace_addr =
(uintptr_t)ctx->baseaddr;
DPRINTF("[%d][0x%llx -> 0x%llx, 0x%llx]\n",
nregions,
mem->regions[nregions].guest_phys_addr,
mem->regions[nregions].userspace_addr,
mem->regions[nregions].memory_size);
nregions++;
}
if (ctx->highmem > 0) {
mem->regions[nregions].guest_phys_addr = 4*GB;
mem->regions[nregions].memory_size = ctx->highmem;
mem->regions[nregions].userspace_addr =
(uintptr_t)(ctx->baseaddr + 4*GB);
DPRINTF("[%d][0x%llx -> 0x%llx, 0x%llx]\n",
nregions,
mem->regions[nregions].guest_phys_addr,
mem->regions[nregions].userspace_addr,
mem->regions[nregions].memory_size);
nregions++;
}
mem->nregions = nregions;
mem->padding = 0;
rc = vhost_kernel_set_mem_table(vdev, mem);
free(mem);
if (rc < 0) {
WPRINTF("set_mem_table failed\n");
return -1;
}
return 0;
}
int