From: Keir Fraser <keir@xensource.com>
To: "Tian, Kevin" <kevin.tian@intel.com>, xen-devel@lists.xensource.com
Cc: "Liu, Jinsong" <jinsong.liu@intel.com>
Subject: Re: trap/interrupt gate for hypercall
Date: Tue, 15 May 2007 16:02:07 +0100 [thread overview]
Message-ID: <C26F89FF.EF8F%keir@xensource.com> (raw)
In-Reply-To: <D470B4E54465E3469E2ABBC5AFAC390F013B1DFE@pdsmsx412.ccr.corp.intel.com>
On 15/5/07 15:43, "Tian, Kevin" <kevin.tian@intel.com> wrote:
> Just a curious question about IDT descriptor type for hypercall. What's
> the reason to use interrupt-gate type (14) for hypercall (0x82) on 32bit
>
> Xen?
Everything's an interrupt gate on 32-bit Xen, so that we can safely
(atomically) save away guest segment register state. NMI is the only real
pain, and I suppose MCE too. Coincidentally Jan just emailed about this very
point.
-- Keir
next prev parent reply other threads:[~2007-05-15 15:02 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-15 14:43 trap/interrupt gate for hypercall Tian, Kevin
2007-05-15 15:02 ` Keir Fraser [this message]
2007-05-15 15:18 ` Tian, Kevin
2007-05-15 15:30 ` Keir Fraser
2007-05-16 0:23 ` Liu, Jinsong
2007-05-17 12:36 ` Liu, Jinsong
2007-05-16 3:17 ` Tian, Kevin
2007-05-16 6:50 ` Keir Fraser
2007-05-16 13:42 ` Liu, Jinsong
2007-05-16 14:23 ` Jan Beulich
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