* [Qemu-devel] vhost-user:why region[0] always mmap failed ?
@ 2014-09-17 2:33 Linhaifeng
2014-10-15 21:28 ` Anshul Makkar
0 siblings, 1 reply; 3+ messages in thread
From: Linhaifeng @ 2014-09-17 2:33 UTC (permalink / raw)
To: qemu-devel; +Cc: jerry.lilijun
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++;
}
}
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [Qemu-devel] vhost-user:why region[0] always mmap failed ?
2014-09-17 2:33 [Qemu-devel] vhost-user:why region[0] always mmap failed ? Linhaifeng
@ 2014-10-15 21:28 ` Anshul Makkar
2014-11-01 2:28 ` Linhaifeng
0 siblings, 1 reply; 3+ messages in thread
From: Anshul Makkar @ 2014-10-15 21:28 UTC (permalink / raw)
To: Linhaifeng; +Cc: qemu-devel, jerry.lilijun
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++;
> }
> }
>
>
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [Qemu-devel] vhost-user:why region[0] always mmap failed ?
2014-10-15 21:28 ` Anshul Makkar
@ 2014-11-01 2:28 ` Linhaifeng
0 siblings, 0 replies; 3+ messages in thread
From: Linhaifeng @ 2014-11-01 2:28 UTC (permalink / raw)
To: qemu-devel, jerry.lilijun
On 2014/10/16 5:28, Anshul Makkar wrote:
> Hi,
>
> Please can you share in what scenario this mapping fails. I am not seeing any such issue.
>
> Thanks
> Anshul Makkar
>
VM info:
memory:4G
hugepage size:2M
memory regions info:
gpa = 0xC0000
size = 3220439040
ua = 0x2aaaaacc0000
offset = 786432
gpa = 0x100000000
size = 1073741824
ua = 0x2aab6ac00000
offset = 18446650252267094016
gpa = 0x0
size = 655360
ua = 0x2aaaaac00000
offset = 0
log:
mmap fd[61] size[3221225472] failed
mmap fd[62] size[18446650253340835840] failed
> 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++;
>> }
>> }
>>
>>
>
>
--
Regards,
Haifeng
^ permalink raw reply [flat|nested] 3+ messages in thread
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2014-09-17 2:33 [Qemu-devel] vhost-user:why region[0] always mmap failed ? Linhaifeng
2014-10-15 21:28 ` Anshul Makkar
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