Re: [Xen-devel] [PATCH v3 6/9] x86/vmce, tools/libxl: expose LMCE capability in guest MSR_IA32_MCG_CAP

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Mar 30, 2017 at 08:57:05AM -0600, Jan Beulich wrote:
> >>> On 30.03.17 at 08:20, <haozhong.zhang@xxxxxxxxx> wrote:
> > If LMCE is supported by host and ' mca_caps = [ "lmce" ] ' is present
> > in xl config, the LMCE capability will be exposed in guest MSR_IA32_MCG_CAP.
> > By default, LMCE is not exposed to guest so as to keep the backwards 
> > migration
> > compatibility.
> > 
> > Signed-off-by: Haozhong Zhang <haozhong.zhang@xxxxxxxxx>
> 
> Hypervisor side
> Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
> 
> For the tools side, doesn't the new HVM param need saving /
> restoring? If so an addition to the array in
> tools/libxc/xc_sr_save_x86_hvm.c:write_hvm_params() is going
> to be needed.
> 

Actually quite a few of HVM params are missing.  It works because libxl
actually sets them, I think.

Haozhong, the best way to check is to `xl migrate guest localhost`.

Wei.

> Jan
> 

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