linux-kernel - Re: [PATCH RESEND] KVM: nVMX: mask unrestricted

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Date:	Tue, 17 Mar 2015 22:09:23 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Radim Krčmář <rkrcmar@...hat.com>
Cc:	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Paolo Bonzini <pbonzini@...hat.com>,
	Kashyap Chamarthy <kchamart@...hat.com>, stable@...r.kernel.org
Subject: Re: [PATCH RESEND] KVM: nVMX: mask unrestricted_guest if disabled on
 L0

On Tue, Mar 17, 2015 at 02:02:32PM +0100, Radim Krčmář wrote:
> If EPT was enabled, unrestricted_guest was allowed in L1 regardless of
> L0.  L1 triple faulted when running L2 guest that required emulation.
> 
> Another side effect was 'WARN_ON_ONCE(vmx->nested.nested_run_pending)'
> in L0's dmesg:
>   WARNING: CPU: 0 PID: 0 at arch/x86/kvm/vmx.c:9190 nested_vmx_vmexit+0x96e/0xb00 [kvm_intel] ()
> 
> Prevent this scenario by masking SECONDARY_EXEC_UNRESTRICTED_GUEST when
> the host doesn't have it enabled.
> 
> Fixes: 78051e3b7e35 ("KVM: nVMX: Disable unrestricted mode if ept=0")
> Cc: stable@...r.kernel.org
> Tested-By: Kashyap Chamarthy <kchamart@...hat.com>
> Signed-off-by: Radim Krčmář <rkrcmar@...hat.com>
> ---
>  The resend Cc'd stable, as recommended by Bandan, and added Tested-by.

Applied to master, thanks.

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