> > Hi, > > > > I'm also experimenting with ivshmem between the root-cell and a bare > > metal cell. In my case, however, on BananaPi M1. > > > > Could you elaborate on modifying the functions > > pci_(read|write)_config to use mmio instead of pio? > > > > I guess it's a matter of accessing the appropriate memory mapped PCI > > configuration space of the (virtual) PCI devices available to the > > guest/inmate instead of accessing PCI_REG_ADDR_PORT and > > PCI_REG_DATA_PORT using functions(out|in)[bwl]? > > Exactly mmio = memory mapped IO, pio = port IO (in|out). The outs and > ins will not work, instead the whole config space will be in physical > memory. The location can be found in the root-cell configuration > .pci_mmconfig_base. > Some more information can be found here. > http://wiki.osdev.org/PCI > > The method currently implemented is called method #1 on that wiki. Make > sure to keep your access aligned with the size that is requested. > > Code that is similar to what you will need can be found in the > hypervisor. hypervisor/pci.c include/jailhouse/mmio.h > > Henning > > > > Best regards - Jonas Weståker > >
Thanks for the fast response. I've got a bit further in porting ivshmem-demo.c from x86 to arm, but a few new questions arise: When scanning the configuration area of the (virtual) PCI device the followning is reported: "IVSHMEM ERROR: device is not MSI-X capable" - is this a problem? jailhouse/inmates/lib/x86/mem.c:map_range() is used to map the IVSHMEM region and registers. Got any pointers to code doing the equivalent for ARM? What is the expected behaviour when accessing unmapped memory in an inmate? (E.g., I can see the inmate/cell gets shut down when touching memory outside .pci_mmconfig_base + 0x100000): # Unhandled data read at 0x2100000(2) FATAL: unhandled trap (exception class 0x24) pc=0x00000ff4 cpsr=0x60000153 hsr=0x93400006 r0=0x00001834 r1=0x0000000d r2=0x00000000 r3=0x00006ed1 r4=0x02100000 r5=0x00000000 r6=0x00000002 r7=0x0000ffff r8=0x00001000 r9=0x00000000 r10=0x00000000 r11=0x00000000 r12=0x00000000 r13=0x00006f80 r14=0x00000fc4 Parking CPU 1 (Cell: "ivshmem-demo") What memory areas are made available by Jailhouse for a cell/inmate to access? BR - Jonas -- 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.
