On 20.03.19 23:24, João Reis wrote:
Hello everyone,
Lately i've been trying to share memory between two cells using uio_ivshmem
driver (https://github.com/henning-schild-work/ivshmem-guest-code), as it has
been recommended here in multiple threads, in Ultrascale+ (arm64).
So firstly, i am using ivshmem-demo.bin to run on non-root cell and test
uio_ivshmem driver. I am using a customized ivshmem-demo.c from another user
that tweaked ivshmem-demo to work in arm64. When debugging this source file
(using printks), i've noticed that the code stops running when mmio_read16() is
called (the printks stop there).
mmio_read16 for accessing the MMCFG space? At least this is how your code looks
like.
Note that upstream inmate/lib for ARM does not support PCI yet, thus does not
map that region. So you may simply trigger a guest-side page fault. Or are you
using a different code base which does that?
Jan
Any ideas of what might be the problem??
I attach the log file of the session where i issue the commands to enable
ivshmem and the cells to share memory.
(NOTE: Some additional information: PCI_CFG_BASE=0xfc000000
lspci -v
00:00.0 Unassigned class [ff80]: Red Hat, Inc Inter-VM shared memory
Subsystem: Red Hat, Inc Inter-VM shared memory
Flags: bus master, fast devsel, latency 0, IRQ 55
Memory at fc100000 (64-bit, non-prefetchable) [size=256]
Kernel driver in use: uio_ivshmem
cat /proc/interrupts
55: 0 0 GICv2 136 Edge uio_ivshmem
cat /proc/iomem
fc000000-fc0fffff : PCI ECAM
fc100000-fc101fff : //pci@0
fc100000-fc1000ff : 0000:00:00.0
fc100000-fc1000ff : ivshmem
)
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Siemens AG, Corporate Technology, CT RDA IOT SES-DE
Corporate Competence Center Embedded Linux
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