From: Avi Kivity <avi@redhat.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: kvm@vger.kernel.org, gleb@redhat.com, joerg.roedel@amd.com,
yoshikawa.takuya@oss.ntt.co.jp, mtosatti@redhat.com
Subject: Re: [PATCH v2 3/3] KVM: x86 emulator: Allow PM/VM86 switch during task switch
Date: Mon, 30 Jan 2012 17:44:29 +0200 [thread overview]
Message-ID: <4F26BADD.7070800@redhat.com> (raw)
In-Reply-To: <4F26B68E.3030100@redhat.com>
On 01/30/2012 05:26 PM, Kevin Wolf wrote:
> >
> > My bet is that it will be 3 if eflags.vm=1 and unchanged otherwise --
> > the cpl update happens when the segment cache is updated. But that's
> > just a guess.
>
> Does even anyone see the new CPL in error cases? An exception is thrown
> immediately, so cs is reloaded and we get an even newer CPL.
Depends on what we have on the IDT for the exception handler...
> So to take
> any notice of the CPL, the "complete the task switch" part would have to
> fail a privilege check. The one thing that comes to mind is that pushing
> an error code could fail, but I don't think this is considered part of
> the task switch.
Right.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2012-01-30 15:44 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-27 19:23 [PATCH v2 0/3] Fix task switches into/out of VM86 Kevin Wolf
2012-01-27 19:23 ` [PATCH v2 1/3] KVM: x86 emulator: Fix task switch privilege checks Kevin Wolf
2012-01-30 10:39 ` Avi Kivity
2012-01-30 11:12 ` Kevin Wolf
2012-01-27 19:23 ` [PATCH v2 2/3] KVM: x86 emulator: VM86 segments must have DPL 3 Kevin Wolf
2012-01-27 19:23 ` [PATCH v2 3/3] KVM: x86 emulator: Allow PM/VM86 switch during task switch Kevin Wolf
2012-01-30 10:24 ` Avi Kivity
2012-01-30 10:56 ` Gleb Natapov
2012-01-30 12:02 ` Avi Kivity
2012-01-30 12:04 ` Gleb Natapov
2012-01-30 13:24 ` Avi Kivity
2012-01-30 11:05 ` Kevin Wolf
2012-01-30 11:09 ` Gleb Natapov
2012-01-30 13:23 ` Avi Kivity
2012-01-30 14:01 ` Kevin Wolf
2012-01-30 14:32 ` Avi Kivity
2012-01-30 15:26 ` Kevin Wolf
2012-01-30 15:44 ` Avi Kivity [this message]
2012-01-30 15:55 ` Takuya Yoshikawa
2012-01-31 9:37 ` Gleb Natapov
2012-01-31 10:26 ` Avi Kivity
2012-01-27 19:52 ` [PATCH v2 0/3] Fix task switches into/out of VM86 Gleb Natapov
2012-01-30 8:48 ` Kevin Wolf
2012-01-30 8:55 ` Gleb Natapov
2012-01-30 10:22 ` Gleb Natapov
2012-01-30 10:35 ` Kevin Wolf
2012-01-30 10:45 ` Avi Kivity
2012-01-30 10:50 ` Gleb Natapov
2012-01-30 11:59 ` Avi Kivity
2012-01-30 12:16 ` Gleb Natapov
2012-01-30 13:27 ` Avi Kivity
2012-01-30 12:31 ` Gleb Natapov
2012-01-30 13:28 ` Avi Kivity
2012-01-30 13:29 ` Gleb Natapov
2012-01-30 13:39 ` Avi Kivity
2012-01-30 10:47 ` Gleb Natapov
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