I am working on fault processing. When I am a fault I am calling void sel4utils_print_fault_message(seL4_MessageInfo_t tag, const char *thread_name) from sel4libsutils library I have tested it for "page fault" condition and it works fine - I am getting seL4_Fault_VMFault fault type But in certain case I have got seL4_Fault_VCPUFault type, which is not implemented sel4libsutils library I try to process this fault similar to seL4_Fault_VMFault to get all neccessary registers, but the kernel does not have functions like seL4_Fault_VCPUFault_get_IP. What is the message format for VCPU fault? Thanks
Just some addition: I have found function
seL4_Fault_VCPUFault_get_HSR(seL4_Fault_t seL4_Fault)
It gives me the value of HSR register, but how can I get fault address and
some other (if exist) information?
Thanks,
---------- Forwarded message ---------
From: Leonid Meyerovich
Even some more information:
These is a function
word_t Arch_setMRs_fault(tcb_t *sender, tcb_t *receiver, word_t
*receiveIPCBuffer, word_t faultType)
which populate a message and send it to fault handler.
In this function
case seL4_Fault_VCPUFault:
return setMR(receiver, receiveIPCBuffer, seL4_VCPUFault_HSR,
seL4_Fault_VCPUFault_get_hsr(sender->tcbFault));
This is only information that sent to fault handler, but
for seL4_Fault_VMFault it provides nuch more
case seL4_Fault_VMFault: {
if (config_set(CONFIG_ARM_HYPERVISOR_SUPPORT)) {
word_t ipa, va;
va = getRestartPC(sender);
ipa = (addressTranslateS1CPR(va) & ~MASK(PAGE_BITS)) | (va &
MASK(PAGE_BITS));
setMR(receiver, receiveIPCBuffer, seL4_VMFault_IP, ipa);
Just some addition: I have found function
seL4_Fault_VCPUFault_get_HSR(seL4_Fault_t seL4_Fault)
It gives me the value of HSR register, but how can I get fault address and
some other (if exist) information?
Thanks,
---------- Forwarded message ---------
From: Leonid Meyerovich
Hello Leonid, On 2024-01-26 16:35, Leonid Meyerovich wrote:
But in certain case I have got seL4_Fault_VCPUFault type, which is not implemented sel4libsutils library
I try to process this fault similar to seL4_Fault_VMFault to get all neccessary registers, but the kernel does not have functions like seL4_Fault_VCPUFault_get_IP.
For virtualisation some things are implemented as VCPU faults even when it are not real faults, the VMM (virtual machine monitor) is expected to know how to handle them. For a vmm implementation, have a look at: https://github.com/seL4/seL4_projects_libs/tree/master/libsel4vm The VCPU code is very platform specific. To read the VCPU's registers you can always use seL4_ARM_VCPU_ReadRegs() or seL4_TCB_ReadRegisters(). For some more information, see this old thread: https://lists.sel4.systems/hyperkitty/list/devel@sel4.systems/thread/WFDO4Y7... Good luck, Indan
participants (2)
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Indan Zupancic -
Leonid Meyerovich