Re: [Xen-ia64-devel] Re: [PATCH] EFI mapping: avoid vhpt fault.

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Mon, Jul 28, 2008 at 05:48:04PM +0900, KUWAMURA Shin'ya wrote:
> Hi,
> 
> On <20080728081030.GL13209%yamahata@xxxxxxxxxxxxx>,
>  Isaku Yamahata wrote:
> > 
> > At this moment, I'm not sure whether this patch is related to
> > the PV-on-HVM driver bug you're seeing.
> > Could you please also try this patch?
> 
> The hypervisor still crashes. I attaches the panic message.

Thank you.
I'll take closer look at this issue.

The interesting thing is isr.ni = 1 for all the panic cases.
It looks like that tlb miss occured and wrong value was written to
a register in tlb miss handler. But I'm not sure at this moment.

thanks,

> 
> The source code:
>                 tlbflush_update_time
>                         
> (&prev->domain->arch.last_vcpu[cpu].tlbflush_timestamp,
>                          tlbflush_current_time());
> 
>         if (is_idle_domain(next->domain))
>                 return;
> 
>         last_vcpu_id = next->domain->arch.last_vcpu[cpu].vcpu_id;
>         last_processor = next->arch.last_processor;
> 
>         next->domain->arch.last_vcpu[cpu].vcpu_id = next->vcpu_id;
>         next->arch.last_processor = cpu;
> 
>         if ((last_vcpu_id != next->vcpu_id &&
> f40000000405f0d0:       05 00 00 00 01 c0       [MLX]       nop.m 0x0
> f40000000405f0d6:       7f 00 00 00 00 c0                   movl 
> r22=0x7fffffff;;
> f40000000405f0dc:       f2 f7 ff 67 
> f40000000405f0e0:       19 00 00 00 01 00       [MMB]       nop.m 0x0
> f40000000405f0e6:       e0 00 80 10 20 00                   ld2 r14=[r32]
> f40000000405f0ec:       00 00 00 20                         nop.b 0x0;;
> f40000000405f0f0:       0a 30 38 20 87 38       [MMI]       cmp4.eq 
> p6,p7=r14,r16;;
> 
> Best regards,

> (XEN) ia64_fault, vector=0x18, ifa=0xf00000000433c080, 
> iip=0xf40000000405f0e0, ipsr=0x0000121008226018, isr=0x0000008000000030
> (XEN) General Exception: IA-64 Reserved Register/Field fault (data access).
> (XEN) d 0xf00000000411c080 domid 1
> (XEN) vcpu 0xf0000004f8f90000 vcpu 6
> (XEN) 
> (XEN) CPU 3
> (XEN) psr : 0000121008226018 ifs : 8000000000000710 ip  : [<f40000000405f0e1>]
> (XEN) ip is at flush_vtlb_for_context_switch+0x41/0x330
> (XEN) unat: 0000000000000000 pfs : 0000000000000006 rsc : 0000000000000003
> (XEN) rnat: 0000000000000000 bsps: 0000000000000000 pr  : 00000000a5558597
> (XEN) ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c0270033f
> (XEN) csd : 0000000000000000 ssd : 0000000000000000
> (XEN) b0  : f4000000040a6510 b6  : a000000200025100 b7  : 0000000000000000
> (XEN) f6  : 000000000000000000000 f7  : 000000000000000000000
> (XEN) f8  : 000000000000000000000 f9  : 000000000000000000000
> (XEN) f10 : 000000000000000000000 f11 : 000000000000000000000
> (XEN) r1  : a000000200250000 r2  : 0000000000000020 r3  : 0000000000000000
> (XEN) r8  : 0000000000000000 r9  : e000000008ccda70 r10 : 0000000000000000
> (XEN) r11 : a0000001007af3e8 r12 : e000000001dafba0 r13 : e000000001da8000
> (XEN) r14 : 0000000000000000 r15 : 000000000000000e r16 : 0000000000000000
> (XEN) r17 : 0000000000000000 r18 : 0000000000000000 r19 : 0000000000000000
> (XEN) r20 : 0000000000000000 r21 : 0000000000000000 r22 : 0000000000000000
> (XEN) r23 : 0000000000000000 r24 : 0000000000000000 r25 : 0000000000000000
> (XEN) r26 : 0000000000000000 r27 : 0000000000000000 r28 : 0000000000000000
> (XEN) r29 : 0000000000000000 r30 : 0000000000000000 r31 : 0000000000000000
> (XEN) 
> (XEN) Call Trace:
> (XEN)  [<f4000000040cbb50>] show_stack+0x80/0xa0
> (XEN)                                 sp=f0000004f8f916f0 bsp=f0000004f8f916d0
> (XEN)  [<f40000000408bce0>] ia64_fault+0x120/0x670
> (XEN)                                 sp=f0000004f8f918c0 bsp=f0000004f8f91698
> (XEN)  [<f4000000040c4300>] ia64_leave_kernel+0x0/0x300
> (XEN)                                 sp=f0000004f8f918c0 bsp=f0000004f8f91698
> (XEN) 
> (XEN) ****************************************
> (XEN) Panic on CPU 3:
> (XEN) Fault in Xen.
> (XEN) ****************************************
> (XEN) 
> (XEN) Reboot in five seconds...

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-- 
yamahata

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