Re: [Xen-devel] [PATCH 1/4] x86/vmx: Don't leak host syscall MSR state into HVM guests

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 13.02.17 at 15:32, <andrew.cooper3@xxxxxxxxxx> wrote:
> hvm_hw_cpu->msr_flags is in fact the VMX dirty bitmap of MSRs needing to be
> restored when switching into guest context.  It should never have been part of
> the migration state to start with, and Xen must not make any decisions based
> on the value seen during restore.
> 
> Identify it as obsolete in the header files, consistently save it as zero and
> ignore it on restore.
> 
> The MSRs must be considered dirty during VMCS creation to cause the proper
> defaults of 0 to be visible to the guest.
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>



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