linux-kernel - Re: [PATCH] KVM: nVMX: fix MWAIT emulation for guests

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Date:   Thu, 4 May 2017 12:37:51 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Alexander Graf <agraf@...e.de>,
        "Gabriel L. Somlo" <gsomlo@...il.com>
Subject: Re: [PATCH] KVM: nVMX: fix MWAIT emulation for guests



On 04/05/2017 11:37, Wanpeng Li wrote:
> 
> The kvm-unit-tests/vmx.flat fails against instruction(mwait) intercept test.
> 
> Test suite: instruction intercept
> Unhandled exception 13 #GP at ip 0000000000402397
> error_code=0000      rflags=00010012      cs=00000008
> rax=0000000000000000 rcx=0000000004006172 rdx=0000000000402397 rbx=000000000041427d
> rbp=0000000007ff8fdf rsi=0000000000000000 rdi=0000000000000004
>  r8=000000000000000a  r9=00000000000003f8 r10=0000000000000000 r11=0000000000000000
>  r12=0000000000000000 r13=0000000000000000 r14=0000000000000000 r15=0000000000000000
> cr0=0000000080010031 cr2=0000000000000000 cr3=0000000007fff000 cr4=0000000000002020
> cr8=0000000000000000
>  	STACK: @402397 401102 400459

The problem is simply that the tests were not clearing eax/ecx/edx.

Update kvm-unit-tests.git, it includes the "[PATCH] vmx: correctly set
up MONITOR and MWAIT" from April 27 (message id
1493309532-14398-1-git-send-email-pbonzini@...hat.com).

Thanks,

Paolo