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 11:01:22 +0200 [thread overview]
Message-ID: <20120110090122.GI2167@redhat.com> (raw)
In-Reply-To: <1326139810-5448-1-git-send-email-kwolf@redhat.com>
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? For vm86 we can change:
else
reason = TASK_SWITCH_CALL;
to
else if (vcpu in vm86 mode)
reason = TASK_SWITCH_GATE;
else
reason = TASK_SWITCH_CALL;
IIRC you can't change tasks by call in vm86 mode.
--
Gleb.
next prev parent reply other threads:[~2012-01-10 9:01 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 [this message]
2012-01-10 9:28 ` Kevin Wolf
2012-01-10 10:17 ` Gleb Natapov
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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