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Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit
From: |
Aravinda Prasad |
Subject: |
Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit |
Date: |
Fri, 13 Nov 2015 11:57:11 +0530 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130510 Thunderbird/17.0.6 |
On Friday 13 November 2015 11:27 AM, David Gibson wrote:
> On Fri, Nov 13, 2015 at 10:23:20AM +0530, Aravinda Prasad wrote:
>>
>>
>> On Friday 13 November 2015 07:28 AM, David Gibson wrote:
>>> On Thu, Nov 12, 2015 at 11:53:45PM +0530, Aravinda Prasad wrote:
>>>>
>>>>
>>>> On Thursday 12 November 2015 01:39 PM, Thomas Huth wrote:
>>>>> On 11/11/15 18:16, Aravinda Prasad wrote:
>>>>>> Memory error such as bit flips that cannot be corrected
>>>>>> by hardware are passed on to the kernel for handling.
>>>>>> If the memory address in error belongs to guest then
>>>>>> guest kernel is responsible for taking suitable action.
>>>>>> Patch [1] enhances KVM to exit guest with exit reason
>>>>>> set to KVM_EXIT_NMI in such cases.
>>>>>>
>>>>>> This patch handles KVM_EXIT_NMI exit. If the guest OS
>>>>>> has registered the machine check handling routine by
>>>>>> calling "ibm,nmi-register", then the handler builds
>>>>>> the error log and invokes the registered handler else
>>>>>> invokes the handler at 0x200.
>>>>>>
>>>>>> [1] http://marc.info/?l=kvm-ppc&m=144726114408289
>>>>>>
>>>>>> Signed-off-by: Aravinda Prasad <address@hidden>
>>>>>> ---
>>>>>> target-ppc/kvm.c | 69 +++++++++++++++++++++++++++++++++++++++++++
>>>>>> target-ppc/kvm_ppc.h | 81
>>>>>> ++++++++++++++++++++++++++++++++++++++++++++++++++
>>>>>> 2 files changed, 150 insertions(+)
>>>>>>
>>>>>> diff --git a/target-ppc/kvm.c b/target-ppc/kvm.c
>>>>>> index 110436d..e2e5170 100644
>>>>>> --- a/target-ppc/kvm.c
>>>>>> +++ b/target-ppc/kvm.c
>>>>>> @@ -1665,6 +1665,11 @@ int kvm_arch_handle_exit(CPUState *cs, struct
>>>>>> kvm_run *run)
>>>>>> ret = 0;
>>>>>> break;
>>>>>>
>>>>>> + case KVM_EXIT_NMI:
>>>>>> + DPRINTF("handle NMI exception\n");
>>>>>> + ret = kvm_handle_nmi(cpu);
>>>>>> + break;
>>>>>> +
>>>>>> default:
>>>>>> fprintf(stderr, "KVM: unknown exit reason %d\n",
>>>>>> run->exit_reason);
>>>>>> ret = -1;
>>>>>> @@ -2484,3 +2489,67 @@ int kvm_arch_msi_data_to_gsi(uint32_t data)
>>>>>> {
>>>>>> return data & 0xffff;
>>>>>> }
>>>>>> +
>>>>>> +int kvm_handle_nmi(PowerPCCPU *cpu)
>>>>>> +{
>>>>>> + struct rtas_mc_log mc_log;
>>>>>> + CPUPPCState *env = &cpu->env;
>>>>>> + sPAPRMachineState *spapr = SPAPR_MACHINE(qdev_get_machine());
>>>>>> + PowerPCCPUClass *pcc = POWERPC_CPU_GET_CLASS(cpu);
>>>>>> +
>>>>>> + cpu_synchronize_state(CPU(ppc_env_get_cpu(env)));
>>>>>> +
>>>>>> + /* Properly set bits in MSR before we invoke the handler */
>>>>>> + env->msr = 0;
>>>>>> +
>>>>>> + if (!(*pcc->interrupts_big_endian)(cpu)) {
>>>>>> + env->msr |= (1ULL << MSR_LE);
>>>>>> + }
>>>>>> +
>>>>>> +#ifdef TARGET_PPC64
>>>>>> + env->msr |= (1ULL << MSR_SF);
>>>>>> +#endif
>>>>>> +
>>>>>> + if (!spapr->guest_machine_check_addr) {
>>>>>> + /*
>>>>>> + * If OS has not registered with "ibm,nmi-register"
>>>>>> + * jump to 0x200
>>>>>> + */
>>>>>
>>>>> Shouldn't you also check MSR_ME here first and enter checkstop when
>>>>> machine checks are disabled?
>>>>
>>>> Yes, MSR_ME should be checked first.
>>>>
>>>>> Also I think you have to set up some more registers for machine check
>>>>> interrupts, like SRR0 and SRR1?
>>>>
>>>> SRRO and SRR1 of vcpu are properly set in KVM in kvmppc_interrupt_hv. I
>>>> am not sure if any other registers need to be set.
>>>
>>> DAR and DSISR are the obvious ones you need to consider, although I
>>> suspect they're already set up correctly by the kernel, too.
>>
>> Yes, they are also setup properly by KVM.
>
> Ok, good. Might be worth throwing a comment in the qemu code noting
> that the kernel has already set up that state properly.
sure.
>
--
Regards,
Aravinda
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, (continued)
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, David Gibson, 2015/11/12
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Thomas Huth, 2015/11/13
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, David Gibson, 2015/11/16
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Aravinda Prasad, 2015/11/12
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, David Gibson, 2015/11/12
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Aravinda Prasad, 2015/11/12
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, David Gibson, 2015/11/13
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit,
Aravinda Prasad <=
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Alexey Kardashevskiy, 2015/11/18
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Aravinda Prasad, 2015/11/19
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Paul Mackerras, 2015/11/16
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Thomas Huth, 2015/11/16
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Aravinda Prasad, 2015/11/16
- Re: [Qemu-devel] [PATCH 4/4] target-ppc: Handle NMI guest exit, Paul Mackerras, 2015/11/16
[Qemu-devel] [PATCH 2/4] spapr: Register and handle HCALL to receive updated RTAS region, Aravinda Prasad, 2015/11/11