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Re: question regarding acrn-hypervisor vioapic implementation

Abdul
 

Hi Anthony, 

I am using sos kernel from https://github.com/projectacrn/acrn-kernel/commits/master commit-id: 9bba4539d654af06d4642f9773e5444da7ee055d and the kernel_config_sos present in the same repository. 

Platform: Apollo Lake 

I can observe that vioapic RTL is updated for IRQ - 14 but the physical ioapic RTL is not updated
Logs:
ACRN:\>vioapic 0
 
PIN     VEC     DM      DEST    TM      DELM    IRR     MASK
14      0x3E    logic   0x1     level   1       0       0
ACRN:\>dump_ioapic
 
IRQ     PIN     RTE.HI32        RTE.LO32        VEC     DST     DM      TM      DELM    IRR     MASK
014     014     0x01000000      0x0000098E      0x8E    0x01    logic   edge    1       0       0
This IRQ corresponds to device INT3452
Logs:
root@:Dom0 ~ $ cat /proc/interrupts 
            CPU0       
  14:          0   IO-APIC   14-fasteoi   INT3452:00, INT3452:01, INT3452:02, INT3452:03
As a result sos is not receiving interrupts from the device. 

I dumped the ioapic writes and saw that RTL was being updated while the interrupt was unmasked
Logs:
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry 10000
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry 10000
[cpu=0][sev=3]:vioapic: ioapic pin14: recalculate vlapic trigger-mode reg
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry 10000
[cpu=0][sev=3]:vioapic: ioapic pin14: recalculate vlapic trigger-mode reg
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry93e                                 
[cpu=0][sev=3]:vioapic: ioapic pin14: recalculate vlapic trigger-mode reg
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry 93e
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry a93e                               ----->   Update is made while the interrupt is unmasked
[cpu=0][sev=3]:vioapic: ioapic pin14: recalculate vlapic trigger-mode reg
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry a93e
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry a93e
[cpu=0][sev=3]:vioapic: ioapic pin14: redir table entry a93e
Thanks!
Best Regards,
Abdul
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