Re: [Xen-devel] Issue in MPX support in Xen

["Rockosov, Dmitry" <dmitry.rockosov@xxxxxxxxx>]

Hello Jan,

I have tested your patch, it works fine in situation when cpu_has_mpx = 1 and 
cpu_has_vmx_mpx = 0.

Thank you!

Best regards,
Dmitry Rockosov

> -----Original Message-----
> From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> Sent: Friday, August 26, 2016 11:09 AM
> To: Rockosov, Dmitry <dmitry.rockosov@xxxxxxxxx>
> Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>; Sorokin, Georgy
> <georgy.sorokin@xxxxxxxxx>; Rechistov, Grigory
> <grigory.rechistov@xxxxxxxxx>; Nakajima, Jun <jun.nakajima@xxxxxxxxx>;
> Tian, Kevin <kevin.tian@xxxxxxxxx>; Kornev, Roman M
> <roman.m.kornev@xxxxxxxxx>; Samoylidi, Sergey N
> <sergey.n.samoylidi@xxxxxxxxx>; xen-devel@xxxxxxxxxxxxx
> Subject: Re: [Xen-devel] Issue in MPX support in Xen
> 
> >>> On 25.08.16 at 18:53, <dmitry.rockosov@xxxxxxxxx> wrote:
> > We are working on enabling XEN with WindRiver Simics, which is Intel
> > reference functional simulator for servers.
> >
> > We found the issue in XEN with MPX using.
> > If MPX is supported by CPUID, but MPX is not supported by VMX, XEN is
> > failing on store CPU MSR GUEST_BNDCFGS (file
> > xen-4.7.0/xen/arch/x86/hvm/vmx/vmx.c:798).
> >
> > SDM says in 24.4.1 Guest Register State:
> > IA32_BNDCFGS (64 bits). This field is supported only on processors
> > that support either the 1-setting of the "load IA32_BNDCFGS" VM-entry
> > control or that of the "clear IA32_BNDCFGS"
> > VM-exit control.
> >
> > Looks like XEN doesn't consult VM-entry control or VM-exit control
> > listed in SDM.
> 
> Could you give the attached patch a try? It's against -unstable and will
> require trivial adjustment to two of the vmx.c hunks in order to apply
> to 4.7.
> 
> Andrew, Kevin, Jun - please take a look as well, in particular regarding
> the non-commit-message remark.
> 
> Jan


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