From: Kevin Wolf <kwolf@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: kvm@vger.kernel.org
Subject: Re: [RFC PATCH] emulator: Fix task switch into/out of VM86
Date: Tue, 10 Jan 2012 12:25:18 +0100 [thread overview]
Message-ID: <4F0C201E.3040206@redhat.com> (raw)
In-Reply-To: <4F0C04A6.1080705@redhat.com>
Am 10.01.2012 10:28, schrieb Kevin Wolf:
> 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.
Did that now, and it looks like exit_int_info is always 0 during the
task switch intercept for a task gate in the IDT. So special-casing VM86
won't help, I'm afraid.
Kevin
next prev parent reply other threads:[~2012-01-10 11:21 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
2012-01-10 11:25 ` Kevin Wolf [this message]
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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