Ok, it does one case that we don’t take care – the update is done during the interrupt is unmasked. Let’s figure out one solution for this.
Thanks & Best Regards,
Jason Chen
SSG -> OTC -> Intel Auto Hypervisor Team
*From:*acrn-users@... [mailto:acrn-users@...] *On Behalf Of *Xu, Anthony
*Sent:* Saturday, June 30, 2018 6:12 AM
*To:* acrn-users@...
*Subject:* Re: [acrn-users] question regarding acrn-hypervisor vioapic implementation
Jason/Fengwei,
Our assumption is not correct.
HV needs to handle RTL change even when it is unmasked.
Anthony
*From:*acrn-users@... <mailto:acrn-users@...> [mailto:acrn-users@...] *On Behalf Of *Abdul
*Sent:* Friday, June 29, 2018 5:42 AM
*To:* acrn-users@... <mailto:acrn-users@...>
*Subject:* Re: [acrn-users] question regarding acrn-hypervisor vioapic implementation
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