Hi,
Please can you share in what scenario this mapping fails. I am not seeing any
such issue.
Thanks
Anshul Makkar
On Wed, Sep 17, 2014 at 10:33:23AM +0800, Linhaifeng wrote:
> Hi,
>
> There is two memory regions when receive VHOST_SET_MEM_TABLE message:
> region[0]
> gpa = 0x0
> size = 655360
> ua = 0x2aaaaac00000
> offset = 0
> region[1]
> gpa = 0xC0000
> size = 2146697216
> ua = 0x2aaaaacc0000
> offset = 786432
>
> region[0] always mmap failed.The user code is :
>
> for (idx = 0; idx < msg->msg.memory.nregions; idx++) {
> if (msg->fds[idx] > 0) {
> size_t size;
> uint64_t *guest_mem;
> Region *region = &vhost_server->memory.regions[i];
>
> region->guest_phys_addr =
> msg->msg.memory.regions[idx].guest_phys_addr;
> region->memory_size = msg->msg.memory.regions[idx].memory_size;
> region->userspace_addr =
> msg->msg.memory.regions[idx].userspace_addr;
> region->mmap_offset = msg->msg.memory.regions[idx].mmap_offset;
>
> assert(idx < msg->fd_num);
> assert(msg->fds[idx] > 0);
>
> size = region->memory_size + region->mmap_offset;
> guest_mem = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED,
> msg->fds[idx], 0);
> if (MAP_FAILED == guest_mem) {
> continue;
> }
> i++;
> guest_mem += (region->mmap_offset / sizeof(*guest_mem));
> region->mmap_addr = (uint64_t)guest_mem;
> vhost_server->memory.nregions++;
> }
> }
>
>
