From: Huang Ying <ying.huang@intel.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org, Marcelo Tosatti <mtosatti@redhat.com>
Subject: Re: [PATCH 1/2] KVM: Expose MCE control MSRs to userspace
Date: Thu, 08 Jul 2010 16:03:48 +0800 [thread overview]
Message-ID: <1278576228.2783.114.camel@yhuang-dev.sh.intel.com> (raw)
In-Reply-To: <4C3581AB.8030404@redhat.com>
On Thu, 2010-07-08 at 15:43 +0800, Avi Kivity wrote:
> On 07/08/2010 05:07 AM, Huang Ying wrote:
> >
> >> static u32 emulated_msrs[] = {
> >> MSR_IA32_MISC_ENABLE,
> >> + MSR_IA32_MCG_STATUS,
> >> + MSR_IA32_MCG_CTL,
> >>
> > We need only clear MSR_IA32_MCG_STATUS during reset, but should not
> > clear MSR_IA32_MCG_CTL.
> >
> >
>
> Why not?
According to Intel 64 and IA32 Architectures Software Developer's Manual
(SDM) Vol 3A (Table 9-1), machine check MSRs should be sticky across
reset. Except we need some special processing for MSR_IA32_MCG_STATUS.
And if we clear MSR_IA32_MCG_CTL, the machine check reporting is
disabled according to SDM Vol 3A, section 15.3.1.3
Best Regards,
Huang Ying
next prev parent reply other threads:[~2010-07-08 8:04 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-07 11:09 [PATCH 0/2] Fix MCE not cleared on reset Avi Kivity
2010-07-07 11:09 ` [PATCH 1/2] KVM: Expose MCE control MSRs to userspace Avi Kivity
2010-07-08 2:07 ` Huang Ying
2010-07-08 7:43 ` Avi Kivity
2010-07-08 8:03 ` Huang Ying [this message]
2010-07-08 8:16 ` Avi Kivity
2010-07-08 8:47 ` Huang Ying
2010-07-08 9:12 ` Avi Kivity
2010-07-12 0:10 ` Huang Ying
2010-07-07 11:09 ` [PATCH 2/2] KVM: Document MCE banks non-exposure via KVM_GET_MSR_INDEX_LIST Avi Kivity
2010-07-12 18:05 ` [PATCH 0/2] Fix MCE not cleared on reset Marcelo Tosatti
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