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[Xen-devel] trap/interrupt gate for hypercall

  • To: <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Tian, Kevin" <kevin.tian@xxxxxxxxx>
  • Date: Tue, 15 May 2007 22:43:05 +0800
  • Cc: "Liu, Jinsong" <jinsong.liu@xxxxxxxxx>
  • Delivery-date: Tue, 15 May 2007 07:41:29 -0700
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AceW/1gtu6fdM4mZSxqwxNTDwzvRGg==
  • Thread-topic: trap/interrupt gate for hypercall

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? Is there any special requirement on interrupt disabled at entrance?

Interesting thing is the compat mode on 64bit Xen which use 64bit 
trap-gate type (15) for hypercall from 32bit guest...


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