linux-kernel - Re: [PATCH -v2 2/2] kvm userspace: Add MCE simulation to kvm

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Date:	Mon, 20 Apr 2009 09:22:59 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH -v2 2/2] kvm userspace: Add MCE simulation to kvm

On Fri, 2009-04-17 at 22:49 +0800, Marcelo Tosatti wrote:
> Hi Huang,
> 
> On Fri, Apr 17, 2009 at 03:38:45PM +0800, Huang Ying wrote:
> > - MCE features are initialized when VCPU is initialized according to CPUID.
> > - A monitor command "mce" is added to inject a MCE.
> > 
> > 
> > ChangeLog:
> > 
> > v2:
> > 
> > - Use new kernel MCE capability exportion interface.
> > 
> > 
> > Signed-off-by: Huang Ying <ying.huang@...el.com>
> > 
> > ---
> >  libkvm/libkvm-x86.c    |   33 +++++++++++++++++++++++++++++++++
> >  libkvm/libkvm.h        |    4 ++++
> >  qemu/monitor.c         |   26 ++++++++++++++++++++++++++
> >  qemu/qemu-kvm-x86.c    |   33 +++++++++++++++++++++++++++++++++
> >  qemu/qemu-kvm.c        |   26 ++++++++++++++++++++++++++
> >  qemu/qemu-kvm.h        |    4 ++++
> >  qemu/target-i386/cpu.h |    3 +++
> >  7 files changed, 129 insertions(+)
> > 
> > --- a/qemu/monitor.c
> > +++ b/qemu/monitor.c
> > @@ -1557,6 +1557,31 @@ static void do_info_status(Monitor *mon)
> >  }
> >  
> >  
> > +#if defined(TARGET_I386) || defined(TARGET_X86_64)
> > +static void do_inject_mce(Monitor *mon,
> > +			  int cpu_index, int bank,
> > +			  unsigned status_hi, unsigned status_lo,
> > +			  unsigned mcg_status_hi, unsigned mcg_status_lo,
> > +			  unsigned addr_hi, unsigned addr_lo,
> > +			  unsigned misc_hi, unsigned misc_lo)
> > +{
> > +    CPUState *env;
> > +    struct kvm_x86_mce mce = {
> > +	.bank = bank,
> > +	.status = ((uint64_t)status_hi << 32) | status_lo,
> > +	.mcg_status = ((uint64_t)mcg_status_hi << 32) | mcg_status_lo,
> > +	.addr = ((uint64_t)addr_hi << 32) | addr_lo,
> > +	.misc = ((uint64_t)misc_hi << 32) | misc_lo,
> > +    };
> > +
> > +    for (env = first_cpu; env != NULL; env = env->next_cpu)
> > +	if (env->cpu_index == cpu_index && env->mcg_cap) {
> > +	    kvm_inject_x86_mce(env, &mce);
> > +	    break;
> > +	}
> > +}
> > +#endif
> 
> This will break compilation on hosts with older kernel headers. To ease
> the merge with QEMU, do_inject_mce should call qemu_inject_x86_mce,
> which does nothing for the case where KVM is disabled, or call KVM
> specific function otherwise (knowledge about struct kvm_x86_mce should
> be contained within KVM code).

Yes. I will fix this.

> > +
> >  static void do_balloon(Monitor *mon, int value)
> >  {
> >      ram_addr_t target = value;
> > @@ -1758,6 +1783,7 @@ static const mon_cmd_t mon_cmds[] = {
> >        "[tap,user,socket,vde] options", "add host VLAN client" },
> >      { "host_net_remove", "is", net_host_device_remove,
> >        "vlan_id name", "remove host VLAN client" },
> > +    { "mce", "iillll", do_inject_mce, "cpu bank status mcgstatus addr misc", "inject a MCE on the given CPU"},
> >  #endif
> >      { "balloon", "i", do_balloon,
> >        "target", "request VM to change it's memory allocation (in MB)" },
> > --- a/libkvm/libkvm-x86.c
> > +++ b/libkvm/libkvm-x86.c
> > @@ -379,6 +379,39 @@ int kvm_set_msrs(kvm_context_t kvm, int 
> >      return r;
> >  }
> >  
> >
> > +int kvm_get_mce_cap_supported(kvm_context_t kvm, uint64_t *mce_cap,
> > +			      int *max_banks)
> > +{
> > +    int r;
> > +
> > +    r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_MCE);
> > +    if (r > 0) {
> > +	*max_banks = r;
> > +	return ioctl(kvm->fd, KVM_X86_GET_MCE_CAP_SUPPORTED, mce_cap);
> > +    }
> > +    return -ENOSYS;
> > +}
> > +
> > +int kvm_setup_mce(kvm_context_t kvm, int vcpu, uint64_t *mcg_cap)
> > +{
> > +    int r;
> > +
> > +    r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_MCE);
> > +    if (r > 0)
> > +	return ioctl(kvm->vcpu_fd[vcpu], KVM_X86_SETUP_MCE, mcg_cap);
> > +    return -ENOSYS;
> > +}
> > +
> > +int kvm_set_mce(kvm_context_t kvm, int vcpu, struct kvm_x86_mce *m)
> > +{
> > +    int r;
> > +
> > +    r = ioctl(kvm->fd, KVM_CHECK_EXTENSION, KVM_CAP_MCE);
> > +    if (r > 0)
> > +	return ioctl(kvm->vcpu_fd[vcpu], KVM_X86_SET_MCE, m);
> > +    return -ENOSYS;
> > +}
> 
> Have to #ifdef KVM_CAP_MCE where appropriate, otherwise compilation 
> on hosts with older kernel headers fail.

Yes. I will fix this.

Best Regards,
Huang Ying


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