From: Gleb Natapov <gleb@redhat.com>
To: Kevin Wolf <kwolf@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [RFC PATCH] emulator: Fix task switch into/out of VM86
Date: Tue, 10 Jan 2012 12:17:36 +0200 [thread overview]
Message-ID: <20120110101736.GL2167@redhat.com> (raw)
In-Reply-To: <4F0C04A6.1080705@redhat.com>
On Tue, Jan 10, 2012 at 10:28:06AM +0100, Kevin Wolf wrote:
> Am 10.01.2012 10:01, schrieb Gleb Natapov:
> > On Mon, Jan 09, 2012 at 09:10:10PM +0100, Kevin Wolf wrote:
> >> * This works with VMX, but with SVM I have an additional problem: When
> >> trying to exit VM86 (usually by an exception) through a task gate in
> >> the IDT, the code runs into the reason = TASK_SWITCH_CALL path. I
> >> searched a bit in the documentation, but didn't find any obvious way
> >> to fix this.
> >>
> > Hmm, so exit_int_info is invalid during task switch exit even though
> > task switch was caused by an exception. I wonder is this the case when
> > vcpu is not in vm86 mode too?
>
> No idea, I would have to try it out.
>
IIRC (again) 32 bit Linux kernel configures double fault as a task gate,
so causing #DF on 32 bit kernel guest should be enough to test that.
--
Gleb.
next prev parent reply other threads:[~2012-01-10 10:17 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-09 20:10 [RFC PATCH] emulator: Fix task switch into/out of VM86 Kevin Wolf
2012-01-10 3:08 ` Takuya Yoshikawa
2012-01-10 4:07 ` Takuya Yoshikawa
2012-01-10 9:01 ` Gleb Natapov
2012-01-10 9:28 ` Kevin Wolf
2012-01-10 10:17 ` Gleb Natapov [this message]
2012-01-10 11:25 ` Kevin Wolf
2012-01-10 11:30 ` Gleb Natapov
2012-01-10 17:51 ` Joerg Roedel
2012-01-16 15:37 ` Kevin Wolf
2012-01-16 15:57 ` Joerg Roedel
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