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From: Amit Shah <amit.shah@redhat.com>
To: Andre Przywara <andre.przywara@amd.com>
Cc: avi@redhat.com, kvm@vger.kernel.org,
	Christoph Egger <christoph.egger@amd.com>
Subject: Re: [PATCH] add sysenter/syscall emulation for 32bit compat mode
Date: Wed, 17 Jun 2009 10:32:36 +0530	[thread overview]
Message-ID: <20090617050236.GA23051@amit-x200.redhat.com> (raw)
In-Reply-To: <1245158713-15054-1-git-send-email-andre.przywara@amd.com>

Hi Andre,

On (Tue) Jun 16 2009 [15:25:13], Andre Przywara wrote:
> sysenter/sysexit are not supported on AMD's 32bit compat mode, whereas
> syscall is not supported on Intel's 32bit compat mode. To allow cross
> vendor migration we emulate the missing instructions by setting up the
> processor state accordingly.
> The sysenter code was originally sketched by Amit Shah, it was completed,
> debugged,  syscall added and made-to-work by Christoph Egger and polished
> up by Andre Przywara.
> Please note that sysret does not need to be emulated, because it will be
> exectued in 64bit mode and returning to 32bit compat mode works on Intel.

Thanks for picking this up. You also had a testcase for this, right?

		Amit

  reply	other threads:[~2009-06-17  5:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-06-16 13:25 [PATCH] add sysenter/syscall emulation for 32bit compat mode Andre Przywara
2009-06-17  5:02 ` Amit Shah [this message]
2009-06-17  7:51   ` Andre Przywara
2009-06-17  7:24 ` Avi Kivity

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