NACK: [SRU][Trusty][Xenial][PATCH] Fix for LP:#1764956

[Juerg Haefliger]

On Mon, 26 Nov 2018 22:55:49 +0800
Gavin Guo <gavin.guo at canonical.com> wrote:

> Hi Juerg,
> 
> On Fri, Nov 23, 2018 at 5:14 PM Juerg Haefliger
> <juerg.haefliger at canonical.com> wrote:
> >
> > Thanks for this Gavin!
> >
> > I recognize the problem and as discussed yesterday, I need to
> > investigate some more. It seems we're missing a couple of patches to
> > make IBRS (and probably IBPB) passthrough work correctly. So rather
> > than patching this up I prefer to backport the relevant commits.
> >
> > After taking a quick peek, it seems we're missing (or at least
> > partially) the following (from linux-stable):
> >
> > fc00dde96099 KVM/SVM: Allow direct access to MSR_IA32_SPEC_CTRL
> > e5a83419c957 KVM/VMX: Allow direct access to MSR_IA32_SPEC_CTRL
> > 755502f810c6 KVM/VMX: Emulate MSR_IA32_ARCH_CAPABILITIES
> > 7013129a4034 KVM/x86: Add IBPB support
> >
> > And probably more plus whatever is needed for our runtime controls
> > (from your patch).  
> 
> Agree, I'll also look into the patches for future compatibility
> issues. Thank you for the time looking into this. :)

Gavin, can you test
https://code.launchpad.net/~juergh/+git/xenial-linux branch lp1764956?

Thanks
...Juerg


> >
> >
> > ...Juerg
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