From: Marcelo Tosatti <mtosatti@redhat.com>
To: Avi Kivity <avi@redhat.com>
Cc: kvm@vger.kernel.org, "Stephan Bärwolf" <stephan.baerwolf@tu-ilmenau.de>
Subject: Re: [PATCH] KVM: x86 emulator: reject SYSENTER in compatibility mode on AMD guests
Date: Wed, 1 Feb 2012 09:00:44 -0200 [thread overview]
Message-ID: <20120201110044.GA26183@amt.cnet> (raw)
In-Reply-To: <1328092020-18511-1-git-send-email-avi@redhat.com>
On Wed, Feb 01, 2012 at 12:27:00PM +0200, Avi Kivity wrote:
> If the guest thinks it's an AMD, it will not have prepared the SYSENTER MSRs,
> and if the guest executes SYSENTER in compatibility mode, it will fails.
>
> Detect this condition and #UD instead, like the spec says.
Note the SYSENTER_CS & 0xfffc == 0 check protects against a fatal error (unlike
the SYSCALL bug), in case of zeroed MSRs.
next prev parent reply other threads:[~2012-02-01 11:02 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-02-01 10:27 [PATCH] KVM: x86 emulator: reject SYSENTER in compatibility mode on AMD guests Avi Kivity
2012-02-01 10:45 ` Stephan Bärwolf
2012-02-01 10:50 ` Avi Kivity
2012-02-01 10:59 ` Stephan Bärwolf
2012-02-01 11:03 ` Avi Kivity
2012-02-01 11:00 ` Marcelo Tosatti [this message]
2012-02-01 13:25 ` Avi Kivity
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