Hi all,
I'm trying to give SMbus access to an inmate cell but the system hangs on this
error: "Invalid PCI config write, port cfc, size 1, address port: 8000f940"
when I try to load the cell.
It's a x86 host and we already have jailhouse running with two inmate cells
giving access to net devices, sharing memory, etc.
>From "lspci", I have:
00:1f.1 SMBus: Intel Corporation Celeron N3350/Pentium N4200/Atom
E3900 Series SMBus Controller (rev 0b)
DeviceName: Onboard - Other
Subsystem: Intel Corporation Device 7270
Flags: medium devsel, IRQ 20
Memory at 91616000 (64-bit, non-prefetchable)
[size=256]
I/O ports at f040 [size=32]
Kernel driver in use: i801_smbus
>From "jailhouse config create ...":
/* MemRegion: 91516000-915160ff : 0000:00:1f.1 */
{
.phys_start = 0x91516000,
.virt_start = 0x91516000,
.size = 0x1000,
.flags = JAILHOUSE_MEM_READ | JAILHOUSE_MEM_WRITE,
},
...
/* Port I/O: f040-f05f : 0000:00:1f.1 */
PIO_RANGE(0xf040, 0x20),
...
/* PCIDevice: 00:1f.1 */
{
.type = JAILHOUSE_PCI_TYPE_DEVICE,
.iommu = 1,
.domain = 0x0,
.bdf = 0xf9,
.bar_mask = {
0xffffff00, 0xffffffff, 0x00000000,
0x00000000, 0xffffffe0, 0x00000000,
},
.caps_start = 0,
.num_caps = 0,
.num_msi_vectors = 0,
.msi_64bits = 0,
.msi_maskable = 0,
.num_msix_vectors = 0,
.msix_region_size = 0x0,
.msix_address = 0x0,
},
First thing I can see is that lspci shows that device's memory region is:
Memory at 91616000 (64-bit, non-prefetchable) [size=256]
While "jailhouse config create ..." shows:
MemRegion: 91516000-915160ff : 0000:00:1f.1
Is that correct?
Anyway, digging in the code I can see that the error comes on
"hypervisor/pci.c, pci_cfg_write_moderate() ...", when trying to access address
0x40 but device has no capabilities.
Giving access to this device is not a big issue for us because we can share
"/dev/i2c-0" status over IVshmem but I'd like to known if there's something
else I can do or it just can't be done.
Thankyou,
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RAIMUNDO SAGARZAZU | Electronics Development
ULMA Packaging Headquarters
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