On 02/12/2019 07:24, Yi Sun wrote: > During test, we found a crash on Xen with below trace. > (XEN) Xen call trace: > (XEN) [<ffff82d0802a065a>] R psr.c#l3_cdp_write_msr+0x1e/0x22 > (XEN) [<ffff82d0802a0858>] F psr.c#do_write_psr_msrs+0x6d/0x109 > (XEN) [<ffff82d08023e000>] F smp_call_function_interrupt+0x5a/0xac > (XEN) [<ffff82d0802a2b89>] F call_function_interrupt+0x20/0x34 > (XEN) [<ffff82d080282c64>] F do_IRQ+0x175/0x6ae > (XEN) [<ffff82d08038b8ba>] F common_interrupt+0x10a/0x120 > (XEN) [<ffff82d0802ec616>] F cpu_idle.c#acpi_idle_do_entry+0x9d/0xb1 > (XEN) [<ffff82d0802ecc01>] F cpu_idle.c#acpi_processor_idle+0x41d/0x626 > (XEN) [<ffff82d08027353b>] F domain.c#idle_loop+0xa5/0xa7 > (XEN) > (XEN) > (XEN) **************************************** > (XEN) Panic on CPU 20: > (XEN) GENERAL PROTECTION FAULT > (XEN) [error_code=0000] > (XEN) **************************************** > > The bug happens when CDP and MBA co-exist and MBA COS_MAX is bigger > than CDP COS_MAX. E.g. MBA has 8 COS registers but CDP only have 6. > When setting MBA throttling value for the 7th guest, the value array > would be: > +------------------+------------------+--------------+ > | Data default val | Code default val | MBA throttle | > +------------------+------------------+--------------+ > > Then, COS id 7 will be selected for writting the values. We should > avoid writting CDP data/code valules to COS id 7 MSR because it > exceeds the CDP COS_MAX. > > Signed-off-by: Yi Sun <yi.y....@linux.intel.com>
Acked-by: Andrew Cooper <andrew.coop...@citrix.com> _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel
