Re: [Xen-devel] CMCI support in Xen - what OS has been tested with it?

["Zhang, Yang Z" <yang.z.zhang@xxxxxxxxx>]

Konrad Rzeszutek Wilk wrote on 2014-04-19:
> Hey,
> 
> I've been tracking an bug with Solaris where all of them stopped
> working with Xen 4.3 and later. I narrowed it down to this commit
> 975b5bdf27031adef6587bb5c92b7a5800e051f1 ("x86: vMCE emulation") which
> now toggles the MCE to advertise the CMCI support.
> 
> If I do:
> diff --git a/xen/arch/x86/cpu/mcheck/vmce.c
> b/xen/arch/x86/cpu/mcheck/vmce.c index ed00f7c..a91bcb7 100644
> --- a/xen/arch/x86/cpu/mcheck/vmce.c
> +++ b/xen/arch/x86/cpu/mcheck/vmce.c
> @@ -46,7 +46,6 @@
>   */
>  #define INTEL_GUEST_MCG_CAP (MCG_SER_P |       \
>                               MCG_TES_P |       \ -                     
>                                      MCG_CMCI_P |      \
>                               GUEST_MC_BANK_NUM)
>  #define AMD_GUEST_MCG_CAP GUEST_MC_BANK_NUM
> or:
> 
> cpuid=['1:edx=xxxxxxxxxxxxxxxxx0xxxxxx0xxxxxxx']
> (mask MCE and MCA cpuid flags)
> 
> then they boot nicely, but that is of course not the long-term solution.
> 
> The guest stops booting - and I am tracking down what it is that it
> expects - but in meantime I was wondering what type of guests have
> been tested for CMCI support? Aka, which ones are suppose to work with this?

I don't think hypervisor will inject CMCI to guest and guest should never 
receive the CMCI. See comments:
/*
 * MCG_SER_P:  software error recovery supported
 * MCG_TES_P:  to avoid MCi_status bit56:53 model specific
 * MCG_CMCI_P: expose CMCI capability but never really inject it to guest,
 *             for sake of performance since guest not polling periodically
 */

So the possible cause is that there may be some assumptions in Solaris which 
depends on CMCI. 

> 
> Thanks!
> 
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> http://lists.xen.org/xen-devel


Best regards,
Yang


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