From: Paolo Bonzini <pbonzini@redhat.com>
To: Nadav Amit <nadav.amit@gmail.com>
Cc: Nadav Amit <namit@cs.technion.ac.il>, kvm@vger.kernel.org
Subject: Re: [PATCH] KVM: x86: Revert "check CS.DPL against RPL during task switch"
Date: Sun, 17 Aug 2014 23:52:41 +0200 [thread overview]
Message-ID: <53F12429.4080103@redhat.com> (raw)
In-Reply-To: <4F071719-C55A-4B18-8F25-47D847311C7D@gmail.com>
Il 17/08/2014 23:33, Nadav Amit ha scritto:
>> > Also, what about the rpl > cpl test below, for non-conforming code
>> > segments? It is not mentioned in table 6-6 either.
> As far as I understand, after task-switch cpl = cs.rpl. This is how the load_state_from_tss32 does it, and follows SDM 7.3, Task Switching:
> "The new task begins executing at the privilege level specified in the CPL field of the CS register, which is loaded from the TSS.”
> As a result, this condition can never occur during task-switch.
>
> Do I miss anything?
No, you're right.
Paolo
next prev parent reply other threads:[~2014-08-17 21:52 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-08-13 17:14 Regression problem with commit 5045b46803 Nadav Amit
2014-08-17 6:17 ` Paolo Bonzini
2014-08-17 6:23 ` Nadav Amit
2014-08-17 6:28 ` Paolo Bonzini
2014-08-17 7:19 ` Nadav Amit
2014-08-17 9:35 ` Paolo Bonzini
2014-08-17 19:32 ` [PATCH] KVM: x86: Revert "check CS.DPL against RPL during task switch" Nadav Amit
2014-08-17 19:34 ` [PATCH kvm-unit-tests] x86: Test task-switch with cs.rpl != cs.dpl Nadav Amit
2014-08-19 10:27 ` Paolo Bonzini
2014-08-19 13:04 ` [PATCH kvm-unit-tests v2] " Nadav Amit
2014-08-19 13:28 ` Paolo Bonzini
2014-08-19 13:34 ` Nadav Amit
2014-08-19 13:37 ` Paolo Bonzini
2014-08-17 21:09 ` [PATCH] KVM: x86: Revert "check CS.DPL against RPL during task switch" Paolo Bonzini
2014-08-17 21:13 ` Paolo Bonzini
2014-08-17 21:33 ` Nadav Amit
2014-08-17 21:52 ` Paolo Bonzini [this message]
2014-08-17 21:39 ` Nadav Amit
2014-08-17 21:52 ` Paolo Bonzini
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