Re: [Xen-devel] [PATCH v1] x86/vvmx: don't enable vmcs shadowing for nested guests

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

> From: Sergey Dyasli [mailto:sergey.dyasli@xxxxxxxxxx]
> Sent: Monday, October 23, 2017 5:33 PM
> 
> Running "./xtf_runner vvmx" in L1 Xen under L0 Xen produces the
> following result on H/W with VMCS shadowing:
> 
>     Test: vmxon
>     Failure in test_vmxon_in_root_cpl0()
>       Expected 0x8200000f: VMfailValid(15) VMXON_IN_ROOT
>            Got 0x82004400: VMfailValid(17408) <unknown>
>     Test result: FAILURE
> 
> This happens because SDM allows vmentries with enabled VMCS
> shadowing
> VM-execution control and VMCS link pointer value of ~0ull. But results
> of a nested VMREAD are undefined in such cases.
> 
> Fix this by not copying the value of VMCS shadowing control from vmcs01
> to vmcs02.
> 
> Signed-off-by: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>

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

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