Public bug reported:
vhost-user implementation doesn't provide information about all memory regions,
and in some cases client is not able to map buffer memory as he is missing
memory region information for specific address.
Same thing is implemented properly for vhost-net. Below gdb outputs are
showing memory regions information provided to the vhost-net and vhost-user.
==== memory regions information provided to vhost-net ====
(gdb) p/x hdev->mem->regions[0]
$21 = {
guest_phys_addr = 0x100000000,
memory_size = 0xc0000000,
userspace_addr = 0x2aab6ac00000,
flags_padding = 0x0
}
(gdb) p/x hdev->mem->regions[1]
$22 = {
guest_phys_addr = 0xfffc0000,
memory_size = 0x40000,
userspace_addr = 0x7ffff4a00000,
flags_padding = 0x0
}
(gdb) p/x hdev->mem->regions[2]
$23 = {
guest_phys_addr = 0x0,
memory_size = 0xa0000,
userspace_addr = 0x2aaaaac00000,
flags_padding = 0x0
}
(gdb) p/x hdev->mem->regions[3]
$24 = {
guest_phys_addr = 0xc0000,
memory_size = 0xbff40000,
userspace_addr = 0x2aaaaacc0000,
flags_padding = 0x0
}
(gdb)
==== memory regions information provided to vhost-user ====
(gdb) p/x msg.memory.nregions
$28 = 0x1
(gdb) p/x msg.memory.regions[0]
$29 = {
guest_phys_addr = 0x0,
memory_size = 0x180000000,
userspace_addr = 0x2aaaaac00000
}
(gdb)
** Affects: qemu
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1333688
Title:
vhost-user: VHOST_USER_SET_MEM_TABLE doesn't contain all regions
Status in QEMU:
New
Bug description:
vhost-user implementation doesn't provide information about all memory
regions,
and in some cases client is not able to map buffer memory as he is missing
memory region information for specific address.
Same thing is implemented properly for vhost-net. Below gdb outputs are
showing memory regions information provided to the vhost-net and vhost-user.
==== memory regions information provided to vhost-net ====
(gdb) p/x hdev->mem->regions[0]
$21 = {
guest_phys_addr = 0x100000000,
memory_size = 0xc0000000,
userspace_addr = 0x2aab6ac00000,
flags_padding = 0x0
}
(gdb) p/x hdev->mem->regions[1]
$22 = {
guest_phys_addr = 0xfffc0000,
memory_size = 0x40000,
userspace_addr = 0x7ffff4a00000,
flags_padding = 0x0
}
(gdb) p/x hdev->mem->regions[2]
$23 = {
guest_phys_addr = 0x0,
memory_size = 0xa0000,
userspace_addr = 0x2aaaaac00000,
flags_padding = 0x0
}
(gdb) p/x hdev->mem->regions[3]
$24 = {
guest_phys_addr = 0xc0000,
memory_size = 0xbff40000,
userspace_addr = 0x2aaaaacc0000,
flags_padding = 0x0
}
(gdb)
==== memory regions information provided to vhost-user ====
(gdb) p/x msg.memory.nregions
$28 = 0x1
(gdb) p/x msg.memory.regions[0]
$29 = {
guest_phys_addr = 0x0,
memory_size = 0x180000000,
userspace_addr = 0x2aaaaac00000
}
(gdb)
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