From: Paolo Bonzini <pbonzini@redhat.com>
To: Andy Lutomirski <luto@amacapital.net>,
Eugene Korenevsky <ekorenevsky@gmail.com>,
kvm@vger.kernel.org
Subject: Re: [PATCH] kvm: x86: vmx: add checks on guest RIP
Date: Thu, 04 Dec 2014 08:41:24 +0100 [thread overview]
Message-ID: <54801024.2050504@redhat.com> (raw)
In-Reply-To: <547F9513.3090600@amacapital.net>
On 03/12/2014 23:56, Andy Lutomirski wrote:
> > This check is off by one. It is checking bits 63:47 instead of bits
> > 63:48 (this quirk is intentionally part of the specification, so that
> > you can reenter a guest at 0x800000000000 after e.g. a VMCALL vmexit and
> > cause a general protection fault).
>
> Seriously? Intel did that for vmcall but not sysret?
Yes, it is even tested by kvm-unit-tests. :)
Paolo
prev parent reply other threads:[~2014-12-04 7:41 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-29 15:27 [PATCH] kvm: x86: vmx: add checks on guest RIP Eugene Korenevsky
2014-12-01 16:27 ` Paolo Bonzini
2014-12-03 22:56 ` Andy Lutomirski
2014-12-04 7:41 ` Paolo Bonzini [this message]
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