Re: [PATCH RESEND] KVM: nVMX: mask unrestricted_guest if disabled on L0

From: Marcelo Tosatti
Date: Tue Mar 17 2015 - 21:09:46 EST

On Tue, Mar 17, 2015 at 02:02:32PM +0100, Radim KrÄmÃÅ 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@xxxxxxxxxxxxxxx
> Tested-By: Kashyap Chamarthy <kchamart@xxxxxxxxxx>
> Signed-off-by: Radim KrÄmÃÅ <rkrcmar@xxxxxxxxxx>
> ---
> The resend Cc'd stable, as recommended by Bandan, and added Tested-by.

Applied to master, thanks.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at
Please read the FAQ at