From: Avi Kivity <avi@redhat.com>
To: Matteo Signorini <signorinimatteo@gmail.com>
Cc: kvm@vger.kernel.org
Subject: Re: ms_sysenter_eip zero value
Date: Wed, 26 Jan 2011 13:24:10 +0200 [thread overview]
Message-ID: <4D40045A.2010806@redhat.com> (raw)
In-Reply-To: <AANLkTi=S_xGDvsqX95swMuyv4EODRbVRnxJiik7A+zv3@mail.gmail.com>
On 01/23/2011 01:25 PM, Matteo Signorini wrote:
> Hi,
>
> I'm having some problems understanding the sysenter instruction.
> As far as I know, in order to successfully call the sysenter instruction,
> MSR_IA32_SYSENTER_CS and MSR_IA32_SYSENTER_EIP registers have to be
> correctly set.
>
> So I printed the value of such registers while the VM was running but
> the output is 0 for both.
>
> now:
>
> 1) I'm having this problem ONLY with the Intel CPU (vmx.c source code).
> When I run the same code on an AMD CPU (svm.c source code)
> MSR_IA32_SYSENTER_EIP and MSR_IA32_SYSENTER_CS contain nonzero values.
>
> 2) I am 100% sure the guest is not executing an int80 but a sysenter
>
> so there is something here I can't understand...
> please help me solving this problem.
How are you printing out the values? Maybe the problem is there?
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2011-01-26 11:24 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-23 11:25 ms_sysenter_eip zero value Matteo Signorini
2011-01-26 11:24 ` Avi Kivity [this message]
2011-01-27 13:01 ` Matteo
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