On 11/09/2023 07:25, bot crack wrote:
hi,
Now I change my a configuration to:
/.platform_info = {
.pci_mmconfig_base = 0xe0000000, // virt address
.pci_mmconfig_end_bus = 0,
.pci_is_virtual = 1,
.pci_domain = 1,
/
/............./
Then I didn’t see the error log
/[ 35.130190] pci-host-generic e0000000.pci: host bridge /pci@0 ranges:
[ 35.130241] pci-host-generic e0000000.pci: MEM
0x00e0100000..0x00e0101fff -> 0x00e0100000
[ 35.130295] pci-host-generic e0000000.pci: ECAM at [mem
0xe0000000-0xe00fffff] for [bus 00]
[ 35.130457] pci-host-generic e0000000.pci: PCI host bridge to bus 0001:00
[ 35.130470] pci_bus 0001:00: root bus resource [bus 00]
[ 35.130480] pci_bus 0001:00: root bus resource [mem
0xe0100000-0xe0101fff]
[ 35.130519] pci 0001:00:00.0: [110a:4106] type 00 class 0xff0000
[ 35.130545] pci 0001:00:00.0: reg 0x10: [mem 0x00000000-0x00000fff]
[ 35.137255] pci 0001:00:00.0: BAR 0: assigned [mem 0xe0100000-0xe0100fff]
/
/[ 35.137602] The Jailhouse is opening.
[ 35.251548] vcc3v3_lcd1_n: disabling
[ 35.285180] psci: CPU3 killed (polled 0 ms)
/
Then I insert uio_ivshmem.ko (build from
https://github.com/henning-schild-work/ivshmem-guest-code/tree/jailhouse)
/[ 35.287908] Created Jailhouse cell "inmate-demo"
[ 50.988039] uio_ivshmem 0001:00:00.0: ivshmem_pci_proben
[ 50.988085] uio_ivshmem 0001:00:00.0: enabling device (0000 -> 0002)
[ 50.988548] uio_ivshmem 0001:00:00.0: using jailhouse mode/
/
/
/
/
Then run /usr/local/sbin/ivshmem-demo and it will show mmap failure.
ID = 0
Maximum peers = 3
/usr/local/sbin/ivshmem-demo: mmap(state): No such device
I never used uio-ivshmem, so I don't know internals. You could use
strace to see which mmap fails and why.
Ralf
Why does mmap fail?
On Saturday, September 9, 2023 at 7:38:59 PM UTC+8 Ralf Ramsauer wrote:
On 09/09/2023 08:04, bot crack wrote:
> Hi, everybody
>
> I encountered some problems when using ivshmem-demo. How should I
set
> the value of pci_mmconfig_base?
Set it to a region where it does physically not collide with any other
IO/Memory.
>
> my rootcell:
> /.platform_info = {
> .pci_mmconfig_base = 0x7BC00000,
> .pci_mmconfig_end_bus = 0,
> .pci_is_virtual = 1,
> .pci_domain = 1,
> .arm = {
> .gic_version = 3,/
>
> .......
>
>
> my linux dts:
> /&reserved_memory {
>
> jailhouse: jailhouse@0x70000000{
> reg = <0x0 0x70000000 0x0 0xBC00000>;
> alignment = <0x1000>;
> no-map;
> status = "okay";
> };
>
> pci_reserved: pci@0x7BC00000{
> reg = <0x0 0x7BC00000 0x0 0x00200000>;
> alignment = <0x1000>;
> no-map;
> status = "okay";
> };
There's no need to reserve it via device tree, because it isn't backed
with anything in any case.
>
> };
> /
> Kernel output after inserting jailhouse.ko
> /[ 264.612191] jailhouse: loading out-of-tree module taints kernel.
> [ 264.624958] pci-host-generic 7bc00000.pci: host bridge /pci@0
ranges:
> [ 264.625007] pci-host-generic 7bc00000.pci: MEM
> 0x007bd00000..0x007bd01fff -> 0x007bd00000
> [ 264.625028] pci-host-generic 7bc00000.pci: *resource
collision: [mem
> 0x7bd00000-0x7bd01fff] conflicts with reserved [mem
0x70000000-0x7bdfffff]*
This happens due to your device tree reservation. If there's nothing
behind 0x7bc..., then simply go without reservation.
> [ 264.625051] pci-host-generic: probe of 7bc00000.pci failed
with error -12
> [ 264.625475] The Jailhouse is opening.
> [ 264.792429] psci: CPU3 killed (polled 0 ms)
> [ 264.794210] Created Jailhouse cell "inmate-demo"
> /
> The operating environment is arm64, linux5.10.160
>
> *How should I set the value of pci_mmconfig_base?*
See above, a free (ideally aligned) memory region in your physical
address space.
Ralf
>
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