On Friday, April 20, 2018 at 12:07:58 PM UTC+5:30, J. Kiszka wrote:
> On 2018-04-20 07:01, [email protected] wrote:
> > On Thursday, April 19, 2018 at 8:17:18 PM UTC+5:30, J. Kiszka wrote:
> >> On 2018-04-19 09:51, [email protected] wrote:
> >>> Hi,
> >>>
> >>> I am trying some experiments in Shared memory,
> >>> CASE 1:
> >>> I have shared some common memory region between root and non-root cell.
> >>> using this mem-region i am able to communicate between root and non-root
> >>> cell(if i write data from root cell to that mem-region i am able to read
> >>> the same data in non-root cell). I have added shared memory in the root
> >>> cell at the end-of mem-region(last-index of mem-region).
> >>>
> >>> CASE 2:
> >>> But when i add this shared mem-region in the middle of root cell
> >>> mem-region, i am not able to communicate between root and non-root
> >>> cell(read and write is not happening from root-cell to non-root cell).
> >>>
> >>> Can someone please explain me why CASE 2 is not working, is that
> >>> mandatory to add shared memory config at the end-of mem-region(last
> >>> index)?
> >>>
> >>> * I am not linked any PCI device to shared mem-region in both the cases.
> >>>
> >>> * For reading and writing from shared mem-region we are using our
> >>> application.
> >>>
> > Thanks for the replay Jan,
> >
> >> It's hard to give you any good suggestion without seeing the configs in
> >> question.
> > I am attaching both root and non-root cell configs can you please take look
> > at it once.
> >
> >> Maybe you didn't split up that larger mem region properly into
> >> two regions,
> >
> > My inmate starting address is: 0x404000000, and my inmate high RAM starts
> > from 0x404300000, I am adding below region into both root and non-root
> > cell(non-root cell i added JAILHOUSE_MEM_ROOTSHARED flag).
> >
> > /* MemRegion: 404100000 : IVSHMEM :JH-added */
> > {
> > .phys_start = 0x404100000,
> > .virt_start = 0x404100000,
> > .size = 0x100000,
> > .flags = JAILHOUSE_MEM_READ | JAILHOUSE_MEM_WRITE,
> > },
> >
> >
> >> maybe the reference from the ivshmem device to the share
> >> memory region by index is not longer correct,
> >
> > i am not linking PCI config to mem-region, index is only matter when we
> > link PCI and mem-region is that correct?
>
> Your configs do not contain any shared memory device.
I agreed my config do not contain any shared memory device but my config
contain
shared memory region. The below region i am sharing both root and non-root
cell, but i am not linking any PCI device to these region.
/* MemRegion: 404100000 : IVSHMEM :JH-added */
{
.phys_start = 0x404100000,
.virt_start = 0x404100000,
.size = 0x100000,
.flags = JAILHOUSE_MEM_READ | JAILHOUSE_MEM_WRITE,
},
> Look at
> configs/[x86/]qemu-x86.c and .../linux-x86-demo.c to see what is
> missing.
As you suggested i comapred my configs and above mentioned configs(qemu-x86.c
and linux-x86-demo.c), In this configs they are using PCI device to link
between root and non-root cell.
{ /* IVSHMEM (networking) */
.type = JAILHOUSE_PCI_TYPE_IVSHMEM,
.domain = 0x0000,
.bdf = 0x0e << 3,
.bar_mask = {
0xffffff00, 0xffffffff, 0x00000000,
0x00000000, 0xffffffe0, 0xffffffff,
},
.num_msix_vectors = 1,
.shmem_region = 14,
.shmem_protocol = JAILHOUSE_SHMEM_PROTO_VETH,
},
But i don't want to add above PCI configuration to my configs, Without adding
this configuration to my config i can communicate between root and non-root
cell, but only problem is i need to add my shared-region at the end of my
config(in mem-region). is that mandatory to add the shared-region at the end-of
my config(mem-region)?
Moyin
> There is also a tutorial at ELC-E 2016 where I addressed the
> topic (slides and video [1]). It just misses one addtional important
> point: .iommu has to be set as well on real machines, in your case
> likely to 1.
>
> Jan
>
> [1] https://elinux.org/ELC_Europe_2016_Presentations
>
> --
> Siemens AG, Corporate Technology, CT RDA IOT SES-DE
> Corporate Competence Center Embedded Linux
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