[Qemu-devel] Re: [patch uq/master 4/8] kvm: x86: add mce support

[Anthony Liguori]

On 10/06/2010 12:34 PM, Marcelo Tosatti wrote:
> Port qemu-kvm's MCE support
>
> commit c68b2374c9048812f488e00ffb95db66c0bc07a7
> Author: Huang Ying<address@hidden>
> Date:   Mon Jul 20 10:00:53 2009 +0800
>
>      Add MCE simulation support to qemu/kvm
>
>      KVM ioctls are used to initialize MCE simulation and inject MCE. The
>      real MCE simulation is implemented in Linux kernel. The Kernel part
>      has been merged.
>
> Signed-off-by: Marcelo Tosatti<address@hidden>
>
> Index: qemu/target-i386/helper.c
> ===================================================================
> --- qemu.orig/target-i386/helper.c
> +++ qemu/target-i386/helper.c
> @@ -27,6 +27,7 @@
>   #include "exec-all.h"
>   #include "qemu-common.h"
>   #include "kvm.h"
> +#include "kvm_x86.h"
>
>   //#define DEBUG_MMU
>
> @@ -1030,6 +1031,11 @@ void cpu_inject_x86_mce(CPUState *cenv,
>       if (bank>= bank_num || !(status&  MCI_STATUS_VAL))
>           return;
>
> +    if (kvm_enabled()) {
> +        kvm_inject_x86_mce(cenv, bank, status, mcg_status, addr, misc);
> +        return;
> +    }
> +
>       /*
>        * if MSR_MCG_CTL is not all 1s, the uncorrected error
>        * reporting is disabled
> Index: qemu/target-i386/kvm.c
> ===================================================================
> --- qemu.orig/target-i386/kvm.c
> +++ qemu/target-i386/kvm.c
> @@ -27,6 +27,7 @@
>   #include "hw/pc.h"
>   #include "hw/apic.h"
>   #include "ioport.h"
> +#include "kvm_x86.h"
>
>   #ifdef CONFIG_KVM_PARA
>   #include<linux/kvm_para.h>
> @@ -167,6 +168,67 @@ static int get_para_features(CPUState *e
>   }
>   #endif
>
> +#ifdef KVM_CAP_MCE
> +static int kvm_get_mce_cap_supported(KVMState *s, uint64_t *mce_cap,
> +                                     int *max_banks)
> +{
> +    int r;
> +
> +    r = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_MCE);
> +    if (r>  0) {
> +        *max_banks = r;
> +        return kvm_ioctl(s, KVM_X86_GET_MCE_CAP_SUPPORTED, mce_cap);
> +    }
> +    return -ENOSYS;
> +}
> +
> +static int kvm_setup_mce(CPUState *env, uint64_t *mcg_cap)
> +{
> +    return kvm_vcpu_ioctl(env, KVM_X86_SETUP_MCE, mcg_cap);
> +}
> +
> +static int kvm_set_mce(CPUState *env, struct kvm_x86_mce *m)
> +{
> +    return kvm_vcpu_ioctl(env, KVM_X86_SET_MCE, m);
> +}
> +
> +struct kvm_x86_mce_data
> +{
> +    CPUState *env;
> +    struct kvm_x86_mce *mce;
> +};
> +
> +static void kvm_do_inject_x86_mce(void *_data)
> +{
> +    struct kvm_x86_mce_data *data = _data;
> +    int r;
> +
> +    r = kvm_set_mce(data->env, data->mce);
> +    if (r<  0)
> +        perror("kvm_set_mce FAILED");
> +}
> +#endif
> +
> +void kvm_inject_x86_mce(CPUState *cenv, int bank, uint64_t status,
> +                        uint64_t mcg_status, uint64_t addr, uint64_t misc)
> +{
> +#ifdef KVM_CAP_MCE
> +    struct kvm_x86_mce mce = {
> +        .bank = bank,
> +        .status = status,
> +        .mcg_status = mcg_status,
> +        .addr = addr,
> +        .misc = misc,
> +    };
> +    struct kvm_x86_mce_data data = {
> +            .env = cenv,
> +            .mce =&mce,
> +    };
> +
> +    run_on_cpu(cenv, kvm_do_inject_x86_mce,&data);
> +#endif
> +}
> +
>   int kvm_arch_init_vcpu(CPUState *env)
>   {
>       struct {
> @@ -274,6 +336,28 @@ int kvm_arch_init_vcpu(CPUState *env)
>
>       cpuid_data.cpuid.nent = cpuid_i;
>
> +#ifdef KVM_CAP_MCE
> +    if (((env->cpuid_version>>  8)&0xF)>= 6
> +&&  (env->cpuid_features&(CPUID_MCE|CPUID_MCA)) == (CPUID_MCE|CPUID_MCA)
> +&&  kvm_check_extension(env->kvm_state, KVM_CAP_MCE)>  0) {
> +        uint64_t mcg_cap;
> +        int banks;
> +
> +        if (kvm_get_mce_cap_supported(env->kvm_state,&mcg_cap,&banks))
> +            perror("kvm_get_mce_cap_supported FAILED");
> +        else {
> +            if (banks>  MCE_BANKS_DEF)
> +                banks = MCE_BANKS_DEF;
> +            mcg_cap&= MCE_CAP_DEF;
> +            mcg_cap |= banks;
> +            if (kvm_setup_mce(env,&mcg_cap))
> +                perror("kvm_setup_mce FAILED");
> +            else
> +                env->mcg_cap = mcg_cap;
> +        }
> +    }
> +#endif
> +
>       return kvm_vcpu_ioctl(env, KVM_SET_CPUID2,&cpuid_data);
>   }
>
> Index: qemu/target-i386/kvm_x86.h
> ===================================================================
> --- /dev/null
> +++ qemu/target-i386/kvm_x86.h
> @@ -0,0 +1,21 @@
> +/*
> + * QEMU KVM support
> + *
> + * Copyright (C) 2009 Red Hat Inc.
> + * Copyright IBM, Corp. 2008
> + *
> + * Authors:
> + *  Anthony Liguori<address@hidden>
> + *
> + * This work is licensed under the terms of the GNU GPL, version 2 or later.
> + * See the COPYING file in the top-level directory.
> + *
> + */
>    

BTW, I'm fairly sure I didn't write any of this code so this copyright 
statement is probably bogus.

Regards,

Anthony Liguori

> +
> +#ifndef __KVM_X86_H__
> +#define __KVM_X86_H__
> +
> +void kvm_inject_x86_mce(CPUState *cenv, int bank, uint64_t status,
> +                        uint64_t mcg_status, uint64_t addr, uint64_t misc);
> +
> +#endif
>
>
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