linux-kernel - Re: [PATCH 0/4] KVM: nVMX: prepare

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Message-ID: <8a500669-8529-de09-343c-fd54172a588f@redhat.com>
Date:   Tue, 2 Jan 2018 14:02:23 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     linux-kernel@...r.kernel.org, kvm <kvm@...r.kernel.org>
Subject: Re: [PATCH 0/4] KVM: nVMX: prepare_vmcs02 optimizations

On 02/01/2018 02:05, Wanpeng Li wrote:
> The issue is still there after applying this to both L0 and L1,
> actually, I can observe a vmentry fail just before the splatting in L0
> w/ and w/o the above code. In addition, I comment out the other
> testcases in unittests.cfg except vmx_controls, then run
> ./run_tests.sh.

Ok, I didn't understand that you're running vmx.flat inside L1 (thus
creating an L3 guest).  The patch I sent is wrong, because
SECONDARY_EXEC_DESC should always be clear in vmx->secondary_exec_control.

Note that even with "-cpu host,+vmx,-umip" I get a hang at

	PASS: Use TPR shadow enabled: TPR threshold 0x10: vmlaunch fails

So that might not be entirely related.  However, the failures with
descriptor exiting are new.

Paolo