Hi, what you see there are the registers of the ivshmem device, not the payload memory region. You will have to map the paddr you have in your cell-config. That paddr can be found in the config space as well, is just not a regular PCI BAR.
I would suggest to write a uio driver and base it on https://github.com/henning-schild-work/ivshmem-guest-code/tree/jailhouse Here is the bit that finds the region https://github.com/henning-schild-work/ivshmem-guest-code/blob/jailhouse/kernel_module/uio/uio_ivshmem.c#L96 Also see: https://github.com/henning-schild-work/ivshmem-guest-code/blob/jailhouse/README.jailhouse And you should not use JAILHOUSE_SHMEM_PROTO_VETH because you are not running a network-device on top of your shmem. Use _UNDEFINED or _CUSTOM instead. Henning Am Tue, 3 Apr 2018 10:47:31 -0700 schrieb Giovani Gracioli <giova...@gmail.com>: > Just another info, after enabling the root cell, I can see the > virtual pci devices with lspci -v: > > 00:00.0 Unassigned class [ff01]: Red Hat, Inc Inter-VM shared memory > Subsystem: Red Hat, Inc Inter-VM shared memory > Flags: fast devsel > Memory at fc100000 (64-bit, non-prefetchable) [disabled] > [size=256] Memory at <unassigned> (64-bit, non-prefetchable) > [disabled] Capabilities: [50] MSI-X: Enable- Count=1 Masked- > > 00:01.0 Unassigned class [ff01]: Red Hat, Inc Inter-VM shared memory > Subsystem: Red Hat, Inc Inter-VM shared memory > Flags: fast devsel > Memory at fc100100 (64-bit, non-prefetchable) [disabled] > [size=256] > > > > > Hello, > > > > I would like to share buffers among cells on arm64 (Xilinx > > ultrascale+). The documentation suggests the use of the ivshmem. > > > > In order to use ivshmem, I changed the root cell config as follows > > (it is based on the zynqmp-zcu102.c original file): > > > > - In the .mem_regions: > > > > /* IVSHMEM shared memory region for 00:00.0 */ { > > .phys_start = 0x800400000, > > .virt_start = 0x800400000, > > .size = 0x100000, > > .flags = JAILHOUSE_MEM_READ | > > JAILHOUSE_MEM_WRITE | JAILHOUSE_MEM_ROOTSHARED, //added > > JAILHOUSE_MEM_ROOTSHARED }, > > > > - In the .pci_devices: > > > > /* 00:00.0 */ { > > .type = JAILHOUSE_PCI_TYPE_IVSHMEM, > > .bdf = 0 << 3, > > .bar_mask = { > > 0xffffff00, 0xffffffff, 0x00000000, > > 0x00000000, 0x00000000, 0x00000000, > > }, > > .shmem_region = 3, > > .shmem_protocol = > > JAILHOUSE_SHMEM_PROTO_VETH, .num_msix_vectors = 1, > > .iommu = 1, > > }, > > > > Then, I load the cell: > > > > jailhouse enable zynqmp-zcu102-ivshmem.cell > > > > Initializing Jailhouse hypervisor v0.8 (37-g1fa9001) on CPU 1 > > Code location: 0x0000ffffc0200060 > > Page pool usage after early setup: mem 33/995, remap 64/131072 > > Initializing processors: > > CPU 1... OK > > CPU 2... OK > > CPU 0... OK > > CPU 3... OK > > Adding virtual PCI device 00:00.0 to cell "ZynqMP-ZCU102" > > Adding virtual PCI device 00:01.0 to cell "ZynqMP-ZCU102" > > Page pool usage after late setup: mem 42/995, remap 69/131072 > > Activating hypervisor > > > > Then, I wrote a simple user-space program that maps the virtual PCI > > ivshmem region to user using mmap: > > > > memfd = open("/dev/mem", O_RDWR | O_SYNC); > > > > mapped_base = mmap(0, MEM_SIZE, PROT_READ | PROT_WRITE, MAP_SHARED, > > memfd, 0xfc100000 & ~MEM_MASK); > > > > mapped_dev_base = mapped_base + (dev_base & MEM_MASK); > > > > for(int i = 0; i < 8; i += 4) { > > *((volatile unsigned int *) (mapped_dev_base + i)) = 1; > > printf("Address: %p, Read valeu = %d\n", (void > > *)(mapped_dev_base + i), *((unsigned int *) (mapped_dev_base + > > i))); } > > > > When I ran this program in the root cell, I got the following > > Unhandled trap: > > > > ./ivshmem_test > > /dev/mem opened. > > Memory mapped at address 0x7f8dd87000. > > Unhandled data write at 0xfc100000(4) > > > > FATAL: unhandled trap (exception class 0x24) > > Cell state before exception: > > pc: 0000000000400904 lr: 00000000004008d8 spsr: 80000000 EL0 > > sp: 0000007fceff8df0 esr: 24 1 1810046 > > x0: 0000007f8dd87000 x1: 0000000000000001 x2: 0000000000000001 > > x3: 0000000000000000 x4: 0000000040100401 x5: 5404000000000000 > > x6: 000000001aec1037 x7: 0000000000000000 x8: 0000000000000040 > > x9: ffffff80ffffffc8 x10: 0000007fceff8df0 x11: 0000007fceff8df0 > > x12: 00000000000003f3 x13: 0000000000000000 x14: 0000000000000000 > > x15: 0000007f8dd8ecc0 x16: 0000000000000000 x17: 0000007f8dc53240 > > x18: 0000000000000a03 x19: 00000000004009a8 x20: 0000000000000000 > > x21: 0000000000000000 x22: 0000000000000000 x23: 0000000000000000 > > x24: 0000000000000000 x25: 0000000000000000 x26: 0000000000000000 > > x27: 0000000000000000 x28: 0000000000000000 x29: 0000007fceff8df0 > > > > Parking CPU 2 (Cell: "ZynqMP-ZCU102") > > > > Does that make sense? Am I missing something in the root cell > > config or the user-space program is wrong? > > > > Best regards > -- You received this message because you are subscribed to the Google Groups "Jailhouse" group. To unsubscribe from this group and stop receiving emails from it, send an email to jailhouse-dev+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
