Re: [Xen-devel] [PATCH for-4.8 1/2] x86/vmx: Correct the long mode check in vmx_cpuid_intercept()

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
> Sent: Monday, November 14, 2016 7:01 PM
> 
> %cs.L may be set in a legacy mode segment, or clear in a compatibility mode
> segment; it is not the correct way to check for long mode being active.
> 
> Both of these situations result in incorrect visibility of the SYSCALL feature
> in CPUID, and by extension, incorrect behaviour in hvm_efer_valid().
> 
> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

Acked-by: Kevin Tian <kevin.tian@xxxxxxxxx>

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