On 11.01.19 22:05, Burak Atalay wrote:
Hello everyone,
I am encountering some problems while trying to run Jailhouse. Attached you can
find the sysconfig file that was generated by “jailhouse config create” command.
While I was cross-checking the memory regions in the sysconfig file with the
output from “cat /proc/iomem” I realized that there was a missing memory region,
so I had to manually enter the following to the sysconfig file:
/* MemRegion: 796b9000-79887fff : Reserved APEI ERST
{
.phys_start = 0x796b9000,
.virt_start = 0x796b9000,
.size = 0x1cf000,
.flags = JAILHOUSE_MEM_READ |
JAILHOUSE_MEM_WRITE |
JAILHOUSE_MEM_EXECUTE |
JAILHOUSE_MEM_DMA,
},
Yes, the config generator does not always catch all required regions. We could
possibly improve on that by digging deeper into what Linux reports as I/O
resources. Specifically, we would have to tell generally reserved and therefore
unused regions apart from these here which are still used.
Before this configuration, “jailhouse enable” command would crash the machine,
after this modification when I run Jailhouse I get the following error:
Activating Hypervisor
VT-d fault event reported by IOMMU 0:
Source Identifier (bus:dev.func): 03:00.0
Fault Reason 0x26 Fault Info: 49000000000 Type 0
I studied the source code for Jailhouse, and also tried to find a solution in
the mailing list, but I was unable to do so. I am attaching the output of the
command “lspci –vvv –s 03:00.0”, “jailhouse hardware check”, “cat /proc/iomem”,
and the system information that is collected by “tools/jailhouse config collect
data.tar”.
Any suggestions are welcome.
On first glance I suspect that - for whatever reason - your system configuration
got an entry to map the I/O region of 03:00.0 in BAR 4 (at 0x383fffe04000)
directly into the guest. That prevents the required virtualization of MSI-X
interrupts by Jailhouse so that the hardware correctly detect an invalid MSI-X
request and rejects it.
Try to remove that mapping from the mem_regions (but make sure to update indexes
that refer to entries after that one).
Jan
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